Perspectives for quarkonium production at the LHC

J.P. LansbergEcole polytechnique – CPHT

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 1 / 17

Outline

What we understand:

1 why QCD corrections do matter at mid- and high-PT

What we seem to understand:

2 The CSM predictions account correctly for the yield

3 Colour Octet Dominance is challenged at low/mid PT in pp

4 QCD corrections do matter for the polarisation

What we do not understand:

5 ψ production at very large PT

What we expect from the LHC

6 More observables !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 2 / 17

Part I

What we understand

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 3 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for Υ at the Tevatron

J.Campbell, F. Maltoni, F. Tramontano, Phys.Rev.Lett. 98:252002,2007P.Artoisenet, J.P.L, F.Maltoni, PLB 653:60,2007

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008)

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

gYet, the impact of double t-channel gluon exchange at α5

S is unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 4 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for Υ at the Tevatron

J.Campbell, F. Maltoni, F. Tramontano, Phys.Rev.Lett. 98:252002,2007P.Artoisenet, J.P.L, F.Maltoni, PLB 653:60,2007

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008)

1e-04

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30 35 40

dσ/d

PT| |y

|<0.

4 x

Br

(pb/

GeV

)

PT (GeV)

ϒ(1S) prompt data x Fdirect

LO

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

gYet, the impact of double t-channel gluon exchange at α5

S is unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 4 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for Υ at the Tevatron

J.Campbell, F. Maltoni, F. Tramontano, Phys.Rev.Lett. 98:252002,2007P.Artoisenet, J.P.L, F.Maltoni, PLB 653:60,2007

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008)

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30 35 40

dσ/d

PT| |y

|<0.

4 x

Br

(pb/

GeV

)

PT (GeV)

ϒ(1S) prompt data x Fdirect

LO NLO

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

gYet, the impact of double t-channel gluon exchange at α5

S is unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 4 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for Υ at the Tevatron

J.Campbell, F. Maltoni, F. Tramontano, Phys.Rev.Lett. 98:252002,2007P.Artoisenet, J.P.L, F.Maltoni, PLB 653:60,2007

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008)

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30 35 40

dσ/d

PT| |y

|<0.

4 x

Br

(pb/

GeV

)

PT (GeV)

ϒ(1S) prompt data x Fdirect

LO NLO NNLO★

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

gYet, the impact of double t-channel gluon exchange at α5

S is unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 4 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for Υ at the Tevatron

J.Campbell, F. Maltoni, F. Tramontano, Phys.Rev.Lett. 98:252002,2007P.Artoisenet, J.P.L, F.Maltoni, PLB 653:60,2007

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008)

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30 35 40

dσ/d

PT| |y

|<0.

4 x

Br

(pb/

GeV

)

PT (GeV)

ϒ(3S) direct dataLO NLO NNLO★

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

gYet, the impact of double t-channel gluon exchange at α5

S is unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 4 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for J/ψ at RHICJPL, arXiv:1003.4319 [hep-ph]

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

g

Impact of t-channel gluon exchange at α5S unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 5 / 17

why QCD corrections do matter at mid- and high-PT

QCD corrections for J/ψ at RHICJPL, arXiv:1003.4319 [hep-ph]

ψ or Υ

α3SP−8T

gψ or Υ

g

α4SP−6T

ψ or Υ

α5SP−4T

g

g

Impact of t-channel gluon exchange at α5S unsure

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 5 / 17

Part II

What we seem to understand

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 6 / 17

The CSM predictions account correctly for the yield

the CSM predictions account correctly for the yield (dσdy )

S. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

-4 -3 -2 -1 0 1 2 3 4

dσ/d

y x

Br

(nb)

y

FJ/ψdirect= 59±10 %

PHENIX (PRL 09 232002)

PHENIX (2009; Prelim.)

LO: gg → J/ψg (nothing new !, back to 1981 !)NLO: gg → J/ψ, gq → J/ψgq, ...using the matrix elements from J.Campbell, F. Maltoni, F. Tramontano, PRL 98:252002,2007

NLO+: adding one new LO contribution cg → J/ψc

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Could be studied viaazimuthalcorrelationJ/ψ + e, µ; 10-40%of the direct signal

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 7 / 17

The CSM predictions account correctly for the yield

the CSM predictions account correctly for the yield (dσdy )

S. J. Brodsky and JPL, PRD 81 051502 (R), 2010

LO: gg → J/ψg (nothing new !, back to 1981 !)

NLO: gg → J/ψ, gq → J/ψgq, ...using the matrix elements from J.Campbell, F. Maltoni, F. Tramontano, PRL 98:252002,2007

NLO+: adding one new LO contribution cg → J/ψc

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Could be studied viaazimuthalcorrelationJ/ψ + e, µ; 10-40%of the direct signal

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 7 / 17

The CSM predictions account correctly for the yield

the CSM predictions account correctly for the yield (dσdy )

S. J. Brodsky and JPL, PRD 81 051502 (R), 2010

LO: gg → J/ψg (nothing new !, back to 1981 !)

NLO: gg → J/ψ, gq → J/ψgq, ...using the matrix elements from J.Campbell, F. Maltoni, F. Tramontano, PRL 98:252002,2007

NLO+: adding one new LO contribution cg → J/ψc

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Could be studied viaazimuthalcorrelationJ/ψ + e, µ; 10-40%of the direct signal

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 7 / 17

The CSM predictions account correctly for the yield

the CSM predictions account correctly for the yield (dσdy )

S. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

-4 -3 -2 -1 0 1 2 3 4

dσ/d

y x

Br

(nb)

y

FJ/ψdirect= 59±10 %

PHENIX (PRL 09 232002)

PHENIX (2009; Prelim.)

NLO+

NLOLO

LO: gg → J/ψg (nothing new !, back to 1981 !)NLO: gg → J/ψ, gq → J/ψgq, ...using the matrix elements from J.Campbell, F. Maltoni, F. Tramontano, PRL 98:252002,2007

NLO+: adding one new LO contribution cg → J/ψc

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Could be studied viaazimuthalcorrelationJ/ψ + e, µ; 10-40%of the direct signal

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 7 / 17

The CSM predictions account correctly for the yield

the CSM predictions account correctly for the yield (dσdy )

S. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

-4 -3 -2 -1 0 1 2 3 4

dσ/d

y x

Br

(nb)

y

FJ/ψdirect= 59±10 %

PHENIX (PRL 09 232002)

PHENIX (2009; Prelim.)

NLO+

NLOLO

LO: gg → J/ψg (nothing new !, back to 1981 !)NLO: gg → J/ψ, gq → J/ψgq, ...using the matrix elements from J.Campbell, F. Maltoni, F. Tramontano, PRL 98:252002,2007

NLO+: adding one new LO contribution cg → J/ψc

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Could be studied viaazimuthalcorrelationJ/ψ + e, µ; 10-40%of the direct signal

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 7 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pbe+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pb

no space for CO (1S0 or 3PJ) in B-factory dataY.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pbe+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pb

no space for CO (1S0 or 3PJ) in B-factory dataY.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pb

e+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pbno space for CO (1S0 or 3PJ) in B-factory data

Y.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pbe+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pb

no space for CO (1S0 or 3PJ) in B-factory dataY.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pbe+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pb

no space for CO (1S0 or 3PJ) in B-factory dataY.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

Colour Octet Dominance is challenged at low/mid PT in pp

the Colour Octet Dominance challenged at low/mid PT in pp ?

Constraints from the PT dependence in ppComputation at NLO for CO channel: CO predictions overshoot data at lowPT

B. Gong, X. Q. Li, J.-X. Wang,PLB 673:197,2009.

The PT dependence is badly reproduced and cannot be properly fit

Strong constraints from the e+e− analyses

Recent update by Belle of e+e− → J/ψ + Xnon cc = 0.43± 0.09± 0.09 pbe+e− → J/ψgg CS at NLO + rel. corr. : 0.4-0.7 pb

no space for CO (1S0 or 3PJ) in B-factory dataY.Q.Ma,et al.,PRL102 (2009)162002;B.Gong, J.X.Wang, PRL102 (2009) 162003; Z.G. Hue et al., PRD81 (2010) 054036

e+e− → J/ψgg CO at NLO: 0.9-1.0 pb using universality from the Tevatron(Academical) reduction by a factor of 3 of the LDMEs, if one ignores the CSM

Y. Zhang et al., PRD81:034015,2010.

Actually, the reduction is much stronger andthe CS channel dominates over CO at low/mid PT in pp

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 8 / 17

QCD corrections do matter for the polarisation

Υ & ψ polarisation in hadroproduction at O(α4S) & O(α5

S)

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101,152001,2008B. Gong, J.X Wang, Phys. Rev. Lett. 100,232001,2008.

JPL, EPJC 61,693,2009.JPL, arXiv:1003.4319 [hep-ph]

-1

-0.5

0

0.5

1

0 1 2 3 4 5

α=(σ

T-2

σ L)/

(σT+

2σL)

PT (GeV)

helicity frame (|y|<0.35)

NLO from gq+gg LO from gg

-1

-0.5

0

0.5

1

1.5

2

2.5

5 10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

Direct ψ(2S) CDF data at s1/2=1.96 TeVLO NLO NNLO★

-1

-0.5

0

0.5

1

10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

LO ϒ+ bb NLO NNLO★

Þ Complete modification of the polarisation at NLO (also at NNLO?)

Þ Yield from kT factorisation is also longitudinal (in the helicity frame)

Þ This is not yet explained by simple arguments(although reasonable)

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 9 / 17

QCD corrections do matter for the polarisation

Υ & ψ polarisation in hadroproduction at O(α4S) & O(α5

S)

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101,152001,2008B. Gong, J.X Wang, Phys. Rev. Lett. 100,232001,2008.

JPL, EPJC 61,693,2009.JPL, arXiv:1003.4319 [hep-ph]

-1

-0.5

0

0.5

1

0 1 2 3 4 5

α=(σ

T-2

σ L)/

(σT+

2σL)

PT (GeV)

helicity frame (|y|<0.35)

NLO from gq+gg LO from gg

-1

-0.5

0

0.5

1

1.5

2

2.5

5 10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

Direct ψ(2S) CDF data at s1/2=1.96 TeVLO NLO NNLO★

-1

-0.5

0

0.5

1

10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

LO ϒ+ bb NLO NNLO★

Þ Complete modification of the polarisation at NLO (also at NNLO?)

Þ Yield from kT factorisation is also longitudinal (in the helicity frame)

Þ This is not yet explained by simple arguments(although reasonable)

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 9 / 17

QCD corrections do matter for the polarisation

Υ & ψ polarisation in hadroproduction at O(α4S) & O(α5

S)

P.Artoisenet, J.Campbell, JPL, F.Maltoni, F. Tramontano, Phys. Rev. Lett. 101,152001,2008B. Gong, J.X Wang, Phys. Rev. Lett. 100,232001,2008.

JPL, EPJC 61,693,2009.JPL, arXiv:1003.4319 [hep-ph]

-1

-0.5

0

0.5

1

0 1 2 3 4 5

α=(σ

T-2

σ L)/

(σT+

2σL)

PT (GeV)

helicity frame (|y|<0.35)

NLO from gq+gg LO from gg

-1

-0.5

0

0.5

1

1.5

2

2.5

5 10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

Direct ψ(2S) CDF data at s1/2=1.96 TeVLO NLO NNLO★

-1

-0.5

0

0.5

1

10 15 20 25 30 35 40 45 50

α =

(σT-2

σ L)/

(σT+

2σL)

PT (GeV)

LO ϒ+ bb NLO NNLO★

Þ Complete modification of the polarisation at NLO (also at NNLO?)

Þ Yield from kT factorisation is also longitudinal (in the helicity frame)

Þ This is not yet explained by simple arguments(although reasonable)

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 9 / 17

Part III

what we do not understand

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 10 / 17

ψ production at very large PT

ψ production at very large PT

1e-06

1e-05

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30

dσ /d

PT| |y

|<0.

6 x

Br

(nb

/GeV

)

PT (GeV)

ψ(2S) productionat sqrt(s)=1.96 TeV

scale and mass uncertainties combined in quadrature

for NNLO* curves:

mc2 < sij

min< 4 mc2

LONLO

NNLO*CDF data

Could simply be the colour octets (3S[8]1 )

What about the polarisation measurement, then ?

(GeV/c)TP5 10 15 20 25 30

α

-1-0.8-0.6-0.4-0.2

00.20.40.60.8

1

CDF DataNRQCD

Psi(2S)

Could be the data ...Let’s wait for the LHC data for prompt ψ(2S) or direct J/ψ

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 11 / 17

ψ production at very large PT

ψ production at very large PT

1e-06

1e-05

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30

dσ /d

PT| |y

|<0.

6 x

Br

(nb

/GeV

)

PT (GeV)

ψ(2S) productionat sqrt(s)=1.96 TeV

scale and mass uncertainties combined in quadrature

for NNLO* curves:

mc2 < sij

min< 4 mc2

LONLO

NNLO*CDF data

Could simply be the colour octets (3S[8]1 )

What about the polarisation measurement, then ?

(GeV/c)TP5 10 15 20 25 30

α

-1-0.8-0.6-0.4-0.2

00.20.40.60.8

1

CDF DataNRQCD

Psi(2S)

Could be the data ...Let’s wait for the LHC data for prompt ψ(2S) or direct J/ψ

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 11 / 17

ψ production at very large PT

ψ production at very large PT

1e-06

1e-05

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30

dσ /d

PT| |y

|<0.

6 x

Br

(nb

/GeV

)

PT (GeV)

ψ(2S) productionat sqrt(s)=1.96 TeV

scale and mass uncertainties combined in quadrature

for NNLO* curves:

mc2 < sij

min< 4 mc2

LONLO

NNLO*CDF data

Could simply be the colour octets (3S[8]1 )

What about the polarisation measurement, then ?

(GeV/c)TP5 10 15 20 25 30

α

-1-0.8-0.6-0.4-0.2

00.20.40.60.8

1

CDF DataNRQCD

Psi(2S)

Could be the data ...Let’s wait for the LHC data for prompt ψ(2S) or direct J/ψ

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 11 / 17

ψ production at very large PT

ψ production at very large PT

1e-06

1e-05

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30

dσ /d

PT| |y

|<0.

6 x

Br

(nb

/GeV

)

PT (GeV)

ψ(2S) productionat sqrt(s)=1.96 TeV

scale and mass uncertainties combined in quadrature

for NNLO* curves:

mc2 < sij

min< 4 mc2

LONLO

NNLO*CDF data

Could simply be the colour octets (3S[8]1 )

What about the polarisation measurement, then ?

(GeV/c)TP5 10 15 20 25 30

α

-1-0.8-0.6-0.4-0.2

00.20.40.60.8

1

CDF DataNRQCD

Psi(2S)

Could be the data ...

Let’s wait for the LHC data for prompt ψ(2S) or direct J/ψ

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 11 / 17

ψ production at very large PT

ψ production at very large PT

1e-06

1e-05

0.0001

0.001

0.01

0.1

1

10

100

0 5 10 15 20 25 30

dσ /d

PT| |y

|<0.

6 x

Br

(nb

/GeV

)

PT (GeV)

ψ(2S) productionat sqrt(s)=1.96 TeV

scale and mass uncertainties combined in quadrature

for NNLO* curves:

mc2 < sij

min< 4 mc2

LONLO

NNLO*CDF data

Could simply be the colour octets (3S[8]1 )

What about the polarisation measurement, then ?

(GeV/c)TP5 10 15 20 25 30

α

-1-0.8-0.6-0.4-0.2

00.20.40.60.8

1

CDF DataNRQCD

Psi(2S)

Could be the data ...Let’s wait for the LHC data for prompt ψ(2S) or direct J/ψ

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 11 / 17

Part IV

what we expect from the LHC:

new measurements

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 12 / 17

Part IV

what we expect from the LHC: new measurements

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 12 / 17

More observables !

New observables

J/ψ+ hadron azimuthal correlations STAR Collab., Phys.Rev.C80:041902 (R),2009.

PYTHIA might not be reliable ( Color Singlet at LO: gg → J/ψg)Need for updates with NLO and NNLO? (gg → J/ψgg , gg → J/ψggg)

J/ψ + D or J/ψ+lepton: peak at ∆φ = π in the yield integrated over PTS. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Besides, the rapiditydependence givesinfo on c(x)plot for RHIC kinematics

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 13 / 17

More observables !

New observables

J/ψ+ hadron azimuthal correlations STAR Collab., Phys.Rev.C80:041902 (R),2009.

PYTHIA might not be reliable ( Color Singlet at LO: gg → J/ψg)

Need for updates with NLO and NNLO? (gg → J/ψgg , gg → J/ψggg)

J/ψ + D or J/ψ+lepton: peak at ∆φ = π in the yield integrated over PTS. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Besides, the rapiditydependence givesinfo on c(x)plot for RHIC kinematics

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 13 / 17

More observables !

New observables

J/ψ+ hadron azimuthal correlations STAR Collab., Phys.Rev.C80:041902 (R),2009.

PYTHIA might not be reliable ( Color Singlet at LO: gg → J/ψg)Need for updates with NLO and NNLO? (gg → J/ψgg , gg → J/ψggg)

J/ψ + D or J/ψ+lepton: peak at ∆φ = π in the yield integrated over PTS. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Besides, the rapiditydependence givesinfo on c(x)plot for RHIC kinematics

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 13 / 17

More observables !

New observables

J/ψ+ hadron azimuthal correlations STAR Collab., Phys.Rev.C80:041902 (R),2009.

PYTHIA might not be reliable ( Color Singlet at LO: gg → J/ψg)Need for updates with NLO and NNLO? (gg → J/ψgg , gg → J/ψggg)

J/ψ + D or J/ψ+lepton: peak at ∆φ = π in the yield integrated over PTS. J. Brodsky and JPL, PRD 81 051502 (R), 2010

0

10

20

30

40

50

0 1 2 3

N(J

/ψ+

c) /

N(J

/ψ+

X)

(%

)

yNo IC

BHPSSea-like

Besides, the rapiditydependence givesinfo on c(x)plot for RHIC kinematics

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 13 / 17

More observables !

New observables

J/ψ + γ

CS rate at NLO ' conservative (high) expectation from COR.Li and J.X. Wang, PLB 672:51,2009

A priori, no real new info on the relative importance of CS vs COBut...

JPL, PLB 679:340,2009.

J/ψ + cc , Υ + bb

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 14 / 17

More observables !

New observables

J/ψ + γ

CS rate at NLO ' conservative (high) expectation from COR.Li and J.X. Wang, PLB 672:51,2009

A priori, no real new info on the relative importance of CS vs COBut...

JPL, PLB 679:340,2009.

J/ψ + cc , Υ + bb

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 14 / 17

More observables !

New observables

J/ψ + γ

CS rate at NLO ' conservative (high) expectation from COR.Li and J.X. Wang, PLB 672:51,2009

A priori, no real new info on the relative importance of CS vs CO

But...

JPL, PLB 679:340,2009.

J/ψ + cc , Υ + bb

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 14 / 17

More observables !

New observables

J/ψ + γ

CS rate at NLO ' conservative (high) expectation from COR.Li and J.X. Wang, PLB 672:51,2009

A priori, no real new info on the relative importance of CS vs COBut...

JPL, PLB 679:340,2009.

J/ψ + cc , Υ + bb

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 14 / 17

More observables !

New observables

J/ψ + γ

CS rate at NLO ' conservative (high) expectation from COR.Li and J.X. Wang, PLB 672:51,2009

A priori, no real new info on the relative importance of CS vs COBut...

JPL, PLB 679:340,2009.

J/ψ + cc , Υ + bb

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 14 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decay

planned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decayplanned by LHC-b

allow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decayplanned by LHC-ballow to study hc as well as ψ

maybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

More observables !

New observables

Polarisation

of direct yields of Υ(3S), then others

polarisation of the χQ (angular dependence of the γ)

rapidity dependence of the polarisation

φ angular dependence of the leptonic decay

polarisation in different frames

J/ψ + J/ψ, J/ψ + Υsee C. Yu’s talk during the first session

strong sensitivity on the CO LDME 3S[8]1

would help to understand large PT inclusive production

Quarkonium studies via pp decayplanned by LHC-ballow to study hc as well as ψmaybe different acceptances, nice cross check

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 15 / 17

Part V

Conclusions and Outlooks

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 16 / 17

Conclusions and Outlooks

LO pQCD (CSM) fails as far as dσ/dPT is concerned

Yet, the LO (and NLO) CSM reproduces the yield:relevant for heavy-ion studies !

Agrees with the strong reduction of CO contributions at low/mid PT

expected from e+e− analyses

Moreover, QCD-corrections bring agreements for dσ/dPT in

γp for J/ψ M.Kramer Nucl.Phys.B459:3 1996

pp for Υ (Tevatron) P.Artoisenet, J.Campbell, JPL,et al.PRL101, 152001 (2008)

pp for ψ (RHIC, Tevatron) (gap at large PT )P.Artoisenet, AIP PC 1038,55,2008.

JPL, EPJC 61:693,2009JPL arXiv:1003.4319 [hep-ph]

Drawback: large theoretical uncertainties. . .

The time has come for another look with new observablesat the LHC or elsewhere !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 17 / 17

Conclusions and Outlooks

LO pQCD (CSM) fails as far as dσ/dPT is concerned

Yet, the LO (and NLO) CSM reproduces the yield:relevant for heavy-ion studies !

Agrees with the strong reduction of CO contributions at low/mid PT

expected from e+e− analyses

Moreover, QCD-corrections bring agreements for dσ/dPT in

γp for J/ψ M.Kramer Nucl.Phys.B459:3 1996

pp for Υ (Tevatron) P.Artoisenet, J.Campbell, JPL,et al.PRL101, 152001 (2008)

pp for ψ (RHIC, Tevatron) (gap at large PT )P.Artoisenet, AIP PC 1038,55,2008.

JPL, EPJC 61:693,2009JPL arXiv:1003.4319 [hep-ph]

Drawback: large theoretical uncertainties. . .

The time has come for another look with new observablesat the LHC or elsewhere !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 17 / 17

Conclusions and Outlooks

LO pQCD (CSM) fails as far as dσ/dPT is concerned

Yet, the LO (and NLO) CSM reproduces the yield:relevant for heavy-ion studies !

Agrees with the strong reduction of CO contributions at low/mid PT

expected from e+e− analyses

Moreover, QCD-corrections bring agreements for dσ/dPT in

γp for J/ψ M.Kramer Nucl.Phys.B459:3 1996

pp for Υ (Tevatron) P.Artoisenet, J.Campbell, JPL,et al.PRL101, 152001 (2008)

pp for ψ (RHIC, Tevatron) (gap at large PT )P.Artoisenet, AIP PC 1038,55,2008.

JPL, EPJC 61:693,2009JPL arXiv:1003.4319 [hep-ph]

Drawback: large theoretical uncertainties. . .

The time has come for another look with new observablesat the LHC or elsewhere !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 17 / 17

Conclusions and Outlooks

LO pQCD (CSM) fails as far as dσ/dPT is concerned

Yet, the LO (and NLO) CSM reproduces the yield:relevant for heavy-ion studies !

Agrees with the strong reduction of CO contributions at low/mid PT

expected from e+e− analyses

Moreover, QCD-corrections bring agreements for dσ/dPT in

γp for J/ψ M.Kramer Nucl.Phys.B459:3 1996

pp for Υ (Tevatron) P.Artoisenet, J.Campbell, JPL,et al.PRL101, 152001 (2008)

pp for ψ (RHIC, Tevatron) (gap at large PT )P.Artoisenet, AIP PC 1038,55,2008.

JPL, EPJC 61:693,2009JPL arXiv:1003.4319 [hep-ph]

Drawback: large theoretical uncertainties. . .

The time has come for another look with new observablesat the LHC or elsewhere !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 17 / 17

Conclusions and Outlooks

LO pQCD (CSM) fails as far as dσ/dPT is concerned

Yet, the LO (and NLO) CSM reproduces the yield:relevant for heavy-ion studies !

Agrees with the strong reduction of CO contributions at low/mid PT

expected from e+e− analyses

Moreover, QCD-corrections bring agreements for dσ/dPT in

γp for J/ψ M.Kramer Nucl.Phys.B459:3 1996

pp for Υ (Tevatron) P.Artoisenet, J.Campbell, JPL,et al.PRL101, 152001 (2008)

pp for ψ (RHIC, Tevatron) (gap at large PT )P.Artoisenet, AIP PC 1038,55,2008.

JPL, EPJC 61:693,2009JPL arXiv:1003.4319 [hep-ph]

Drawback: large theoretical uncertainties. . .

The time has come for another look with new observablesat the LHC or elsewhere !

J.P. Lansberg (Ecole Polytechnique–CPHT) Quarkonium production at the LHC July 22, 2010 17 / 17