search for bottom counterparts of x(3872) and y(4260) via p + p -

Xb/Yb George W.S. Hou (NTU) ICHEP’06, 7/28/06 1

Search for Bottom Counterparts ofX(3872) and Y(4260) via

July 28, 2006, ICHEP’06 @ Moscow


Outline

I Introduction

II Xb at Tevatron/LHC

III Yb in ee (ISR) Yb

IV Discussion and Conclusion

A simple talk to motivate the experts

based on hep-ph/0606016 (published in PRD)


I. Introduction

J/Xb, Yb

Bottomonium?

[X(3940), Z(3940)]

J/J/


Narrow

DD* threshold

preferred


Direct Scan

ISR

~ MeVeeBJ~ eV

vs eV

Large Y

2005

2006

The Y(4260)


II. Xb at Tevatron/LHC

Mass: If BB* ➯ 10640 MeV If coupled BB* and s/d-wave ➯ ~10560 MeV

Production: - No B KX analogue - Fortunately prompt X(3872) dominant (~ (2S))

Will check if dominant when seen

~ 3000 X(3872) evts / fb1

[ J/

Xb analogue: ~ 180 evts ~ 180 evts / 8fb/ 8fb11

4.4K/77pb1 vs 300K/40pb1 J/

PRL’02

PRD’05

TooOptimistic?


More conservative: Take ratio of peaks ~ 1/800 ➯ ~ 30 evts ~ 30 evts / 8fb/ 8fb11

To Do

bbbb

- benchmark: (2S) - Look for high mass, narrow statesLook for high mass, narrow states

???

(seems on-going at CDF)

Promising at Tevatron Run II

N.B. BR, production frac., etc.

CDF, PRL’02

CDF, PRD’05

J/


Assured at LHC (if exist)

Huge cross section over 102 increase ➯ Expect > > 10103 3 evts / evts / fbfb11

Xb Domenech-Garret, Sanchis-Lozano, NPB’01

PYTHIAfitting CDF J/

Remarks - Much work to do to estimate cross sections - Forward cross sections even less known Should be larger ! - LHCb has forward design (w/ RICH/ECAL)

➯ Spectroscopy May be best @ LHCbMay be best @ LHCb

Any narrow state, e.g. J/(KKJ/?)

“Y(3940)”

To Do

bbbb

- benchmark: (2S) - Look for high mass, narrow statesLook for high mass, narrow states

???

for ATLAS, CMS, LHCb

CDF, PRL’02


II. Yb in ee (ISR) Yb

ee+J/pb

~ 125 evts

BaBar, PRL’05

233 fb-1

Analogy: Do bothboth ee ISR and ee

CLEO-c, PRL’06

ee J/ee ISR J/

~ 35 evts

13 pb-1

stimulate


Belle (5S) Runs

June 21-23, 2005 1.86 fb

10825 10845 10865 10885 10905

each 30 pb

@ 10869 MeV

Repeated June, 2006

21.7 fb !

~ 1 fb/day

Do Both ee and ee ISR

~ 24 fb on (5S) at handDirect Scan Quick and Easy

Yb Mass ? Cross Section ?

Bs motivated

EnergyEnergyscan:scan:


Mass: Use QQg hybrid (CLEO favored) lattice work to illustrate

- 10600 - 10900 MeV (Michael) Could scale down, ∵ ccg prediction typically higher than Y(4260)

➯ Could show up in ISR on Could show up in ISR on (5S)(5S)

- 10900 – 11000 MeV (Juge, Kuti, Morningstar)

Predicted ccg state ~ 4260 ➯ Prefers Higher Energy ScanPrefers Higher Energy Scan

Width: 100 MeV (~ Yc = Y(4260)) plausible

Product BR:

Assume

~

Could be smaller or larger

Guestimates

BaBar/CLEO

─

─

─

10865


Cross Section:

energy fraction in CM

Direct

ISR on (5S)

─ ─~1/s scaling

Even for ~ 1 eV,

~ 125 ISR evts @ 10700 MeV, for 25 fb on (5S)

~ 45 Direct Scan evts / 30 pb

Comparable toBaBar

CLEO-cfor Y(4260)

Yb Evt Guestimates

More effective ?More effective ?

10900 11000

Promising !


IV. Discussion and Conclusion

• Only Tevatron confirmed X(3872) — Need Highest Energy - Only narrow states at hadronic colliders: Go for Xb

- Too much combinatorics () for heavy ion collisions

• not easy at ee, so/but LHCb should - Be prepared for other Narrow States - Aim for diverse modes (e.g. KK or ) and JPC determination

• Available (5S) at Belle should be exploited for ISR Yb

Probably hard for BaBar to collect equivalent data

• Both Belle and BaBar should try Quick energy scan 10600 – 11000 MeV Profitable ! (?)Quick energy scan 10600 – 11000 MeV Profitable ! (?)

• If Yb found, can run a little longer around direct eeYb

Study different channels (KK ? ?) and properties (be ingenious)


Conclusion

at Tevatron/LHC ? ISR at B Factories ?

233 fb

125 evts

Xb, Yb Maybe Discovered in Near Future !

BaBar

search for bottom counterparts of x(3872) and y(4260) via p + p -

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