1 trend in charm spectroscopy a recap of particles an intro d sj spectroscopy x,y,z states charmed...
TRANSCRIPT
1
Trend in Charm Spectroscopy
• A Recap of particles
• An Intro
• DsJ Spectroscopy
• X,Y,Z states
• Charmed baryons
• Measurement of Spins
• D0-D0 Mixing
• Summary and Conclusion
byUsha Mallik (The University of Iowa)
2
3 generations of quarks, & leptons
e+ e- hadronse+ e- μ+ μ-R
=
Quarks, leptons spin 1/2
These quarks immediately ‘Dress-up’ as Hadrons by strong interactions (QCD)
e+e- qq , l+l-
3
Continuum and Resonance Production
R
cc
Hidden charm
bb
4
What happens at BABAR
b
b
b
q
q
b
(4S)
B
B
(10580) MeV
e- beam energy 9.1 GeV, e+ beam energy 3 GeV, E(cm) = 10.58 GeV
e+e- 4S) BB , also cc, ss, uu, dd
e+e- bb) 1.05 nb
(cc) 1.30 nb
(uds) 2.09 nb
time
(5279MeV)
5
b
b
(1S) (9460) MeV
q
q
q
q
X
X
time
Since (1S) is below B meson pair production threshold,
the original b quarks can not be present in the final state:
causing the decay rate slower, ie, the lifetime of (1S) longer,
and the resonance narrow.
OZI Suppression in Decays
6
The “Periodic Table” of Hadrons
Originally in the 1960’s with only u, d, s quarks:
meson qq {q u, d, s ; q u, d, s }
JP = 0- , Pseudoscalar nonet with '
JP = 1- , Vector nonet
J = ½ + ½ = 0
J = ½ + ½ = 1
Gell-Mann’s Eight-fold Way :
3 3 = 1 8
7
JP = 0- , Pseudoscalar nonet and c
JP = 1- , Vector nonet and J/
With u, d, s, c quarks, the picture gets richer
8
The BABAR Detector at PEP-II and the Dataset
BBSee )4(Ecm = 10.58 GeVAnd Much More
Peak luminosity > 1.2 x 1034 cm-2 s-1; Delivered luminosity > 425 fb-1
9
Charm-strange mesons (cs) : Ds, DsJ
With 400 fb-1 data, over 1 billion charmed hadrons produced
10
Expected spectroscopy
3P0
11
DSJ(2317)+ and DSJ(2460)+ observed in
States prior to 2003
But for 2573: 2+ not established
DSJ(2317)+ = 2319.6 ± 0.2 ± 1.4 MeV/c2
DSJ(2460)+ = 2460.2 ± 0.2 ± 0.8 MeV/c2
Also observed in B-decays
Ground State DS(1969)+: JP=0-, c and s spins opposite, in S-wave
Observed States
Spin-Parity Established
12
(2006)
x 103 x 103 x 103
1
(fits better with a Gaussian, rather than BW)
13
Yield =182 30 Mass ( MeV/c2): 2715 +11
-14
Width (MeV/c2): 11520+36-32
14
Preliminary (New)
15
A Very Rich Spectroscopy in cs is emerging
16
NEXT:
The New Charmonia ! The Alphabet Soup !
17
The Charmonium(-like) States
Below DD threshold states well understood. The X,Y,Z states are all above the threshold
18
Confirmed by BABAR, CDF, D0
19
Properties of X(3872)
20
Preliminary (New)
21
22
While searching for BABAR finds new state Y(4260)
Not seen in DD
23
24
NEXT
The Status of Charmed Baryons
25
Baryons
baryon qqq, anti-baryon qqq
(uud)(udd)
(uds)(dds)
(uus)
(uss)(dss)
J = ½ + ½ + ½ = ½
Baryon Octet
(uuu)
J = ½ + ½ + ½ = 3/2
(ddd)
(sss)
Baryon Decuplet
333 = 188’10
26
Baryons with 4 flavors (u,d,s,c)
3/2+1/2+
1/2-u,d,s, decuplet
u,d,s, octet
Ground states
Ground state
= 4 20’20’20
Anti-symmetric
*
5 ground states with JP = 3/2 observed: only c* was missing
All 9 ground states with JP = ½ observed
27
The singly charmed u,d,c sub-multiplets from the 20’ 9 members; JP = 1/2
(2698)
(2285)
(2472)(2466)
(2574)(2579)
36
About charmed baryons
c+ -+ + c
0 - +0K-
-+0 -+-+ -K-++
c0 -
p-
-K+
-+0
Anti-symm under the interchange of the two light quarks (u,d,s)
symm. under the interchange of the two light quarks (u,d,s)
Example Decays:
28
Charm Baryon production
Charm baryon or anti charm baryon + X
b c, and c s are weak decays, ~10-13 s lifetime
Charm baryon lifetimes are small, even though weak decays
e+e- BB
e+e- cc
Weak Decays of -, - and 0 take ~ 1,000 times longer
29
30
Observation of Λc(2880)+ and Λc(2940)+ decaying to D0p
New Decay mode: Λc(2880)+ D0p First observation of charm baryon charm meson
Nsig=2280310
Λc(2940)Λc(2880)
Wrong sign D0P
D0 mass sidebands
Λc(2765)Λc(2880)
Λc(2940)
Belle confirms in c (c)
BaBar PRL 98:012001(2007)
M(ΛC + -) GeV/c25410 1.8
0.4-1.02937.9 1007060-40-210 )2940(c
4.00.70.3-5.5 0.4
0.3-0.22881.2 4050880 )2880(c
5.95.217.5 1.01.32939.8 3102280 )2940(c
1.11.55.8 0.50l.2881.9 190 2800 )2880(c
[MeV] ]2M[MeV/c Yield sonanceRe
D0p invariant mass GeV/c2
Belle Hep-ex/0608043
Excellent agreement in mass and width
31
cx(3077)+
cx(2970)+
New charm strange baryons BaBar confirms these states
Belle, PRL97:162001(2006) BaBar hep-ex/0607042
32
c0 Production and Decay
PDG values
c0 Decay
33
From B decays
Continnum production
Off-peak data: Below B-pair thres-hold, no peak
c0 Production in B decays
p* distribution, momentum in the e+e- rest frame
hep-ex/0703030, submitted to PRL
-410 Few )0( XcBB
34
Discovery of the C*
Combined
BaBar PRL 231 fb-1
97:232001(2006)
)2GeV/c(pdgMMM 0c
0c
*c
Data from all four c0
decay modes are combined and fit yields: 105 21 6 5.2 signal significance
m ( mc* - mc0)= (70.8 1.0 1.1) MeV/c2
Theory range: m = 50 – 94 MeV/c2
= 1.01 0.23 0.11
For XP > 0.5, most/all the c0 may results from
c* production, but uncertainty is large.
No signal found in the c0 mass
Sidebands (hatched area)
35
Also observed the charged partner c’+
36
Study of b → ccs decay
Inconsistency in the MC and data p* distribution: MC only has b → cud
Search B decays into charm-baryon-anti-charm-baryon pair
B → cc and B → c c K
BABAR, PRL. 95 142003, 2005
37
B decays to cc and c cK
E = energy difference between reconstructed B and Ecm
mES : beam momentum substituted reconstructed B mass: e+e- BB
An example
38
B decays to cc
PRD 74 (2006) 111105
39
B decays to c cK PRL 97 (2006) 202003
40
NEXT
Spin Measurements
41
- inherits the spin projections of the c0
Examine implications of - spin hypotheses for angular distribution of from - decay
Initial helicity, λi = λ ()= ± 1/2 Final state helicity, λf = λ () - λ(pseudoscalar) = ± 1/2
Decay amplitude for Ω- → Λ K-: ffifiADA JJ
)0,,(*
λ() = ± 1/2
λ(K) = 0
λ(K) = 0J = 1/2m = + 1/2m = - 1/2
) = + 1/2() = - 1/2
density matrix element for - spin projection i
= density matrix element for charm baryon parent
Transition matrix element does not depend on i
[Wigner-Eckart theorem]
quantization axis
K-
-K+
(+) c0 = 0
c
- = 0
since, no orbital angular momentum projection w.r.t. quantization axis in Ξc0 decay
diagonal density matrix element for - spin projection i = () is i
Total Intensity:
2*
,
2
,
)0,,(2
1
2
1ffi
fi
fii
fi
ADAI Ji
J
42
)cos5cos21(
)cos31(
1
42
2
I
I
I
Spin measurement of - from c0 → - K+, -
→ K- decays
→ Fit Prob = 10 -17
→ Fit Prob = 0.64
→ Fit Prob = 10 -7
Background-SubtractedEfficiency-Corrected
J = 1/2
J = 5/2
J = 3/2
Data
~ 116 fb-1
J ≥ 7/2 also excluded: angular distribution increases more steeply near cos ~ ±1 and has (2 J -2) turning points.8
Similar conclusion from c
0 → -+, - → K- decays
Conclusion:J(-) = 3/2 [assumingJ(c
0) = 1/2]
PRL 97 (2006) 112001
43
NEXT
D0 – D0 Mixing
44
45
Example: Mixing
One of the main HEP discoveries in 2006: Bs Oscillations
x=24.8y~0.1?Bs
0 oscillate very rapidly
Rate first measured in 2006 by CDF and D0
Toy MC
46
47
Time-Evolution of D0 → K+ π−
D0 can reach the K+ - final state in two ways:1) Doubly-Cabibbo-Suppressed decay2) Mixing to D0bar, followed by Cabibbo-Favoured decay... and interference between them.
Q: How can we distinguish these?A: By the time evolution.
48
Best fit
No mixing
1σ
2σ
3σ
4σ
5σ
Contours include statistical & systematic errors
Fit is inconsistentwith no-mixing at 3.9
Fit Results
RD: (3.03±0.16±0.10)x10-
3 x’2: (-0.22±0.30±0.21)x10-3
y’: (9.7±4.4±3.1)x10-3x'2, y' correlation: -0.94
WS decay time, signal region
data - no mix PDFmix - no mix PDF
Fit to signal & sideband regionsPlot above shows just signal region:
1.843<m<1.883 GeV/c2
0.1445<m< 0.1465 GeV/c2
Evidence for D0-D0 mixing!
49Ratio of WS/RS events clearly increase with time. Mixing signal!
Inconsistentwith no-mixinghypothesis2=24
Consistent withprediction fromfull likelihood fit2=1.5(stat. only)
Many validation tests done
Most powerful is performing a time-independent fit of the Wrong-Sign and Right-Sign yields in slices of proper lifetime:
50
Summary
• A new landscape in many areas including spectroscopy has opened up with high luminosity and precision– New DsJ Spectroscopy
– X, Y, Z States– Charmed Baryon Spectroscopy– Spin Measurements (necessary to identify levels, complex
analysis for multi-body states: c (1530), c (1690), in Charmed Baryon decays )
– D0-D0 Mixing Observed
Expecting ~three/four times more data than shown in analyses
A race to find Beyond Standard Model Physics
51
52
53
54
Legendre Polynomial Moments in Spin Determination
s)polynomial Legendre normalized( ,cos coscos and
0 odd is if and ,12 where
ij
1
1
max
dPP
PlJl
ji
l
For - spin J, the previous angular distributions can be written
N
jjlll PPNdP
d
dN
1
1
1coscoscos
cos that So
)( where,coscos
max
0
l
lll PPN
d
dN
Each assumption for J defines lmax
if J is correct calculable is and
, if ,0 max
l
l
P
llP
NP
PN
j l
jl 1
max
max)(cos
that So
max
max)(cos
l
jlj
P
Pw
i.e. projects the complete signal by giving each event weight:
9
55
c0 →
[loose cuts]
Illustration of the Use of Legendre Polynomial Moments in Spin Determination
(will prove
useful later)
efficiency-corrected * √10 P2 (cos) weighted
wj = √10 P2(cos)from c
0 signal region
▬ efficiency-corrected *, mass-sideband-subtracted unweighted m( K-) distribution in data
- →signal
For example, for c0 → - K+ and J()=3/2:
20
202
)(cos10
1)(cos
2
1cos31
4cos
PP
PPNN
d
dN
lmaxlmax = 2, < P > =1/√10
efficiency-corrected * (7/ √2) P4 (cos) weighted
wj = (7/ √2) P4(cos) [for J=5/2, lmax=4, < Pl > = √2/7 ]
from c0 signal region
max
- →signal
56
57
58
59
Observation of b ccs cw- (W- cs)
W- W-
Charm baryon pair production in B Decays
60
List of Decay Modes (pair production)
2*4/ BES psm 2/* sEE B
2*4/ BES psm
2/* sEE B
Reconstruct the B meson
Use energy momentum conservation between e+e- cm and BB in cm
(also : )
Look for signal events in the mes, 2D distribution
61
Fit to SignalAnalysis ongoing
B- cc K-
p
62
Study of c0 (css)
Production Process and Ratio of Branching Fractions of C0
(css)
cc or B C0 + X C
0 - +
- + - +
-K- + +Preliminary results shown at 2005 summer conferencesImproved analysis using likelihood selection in progress
63
Inclusive c0 Studies
Branching Fractions and Production Mechanism from p* Spectrum
Decay Modes of C0 Studied -+, -+- +, and -K- + +
C0-+
P* > 2.8 GeV/c
225 fb -1
Results:
BABAR
SLAC-PUB-11323, hep-ex/0507011
64
Helicity Formalism, Spin Determination
Suited to two-body (successive) decays
Can be extended to intermediate resonances
(ie, quasi-twobody decays using Dalitz plots)
65
quantization axis
Charm baryon rest-frame Hyperon rest-frame
HyperonPseudoscalar
Hyperon daughter
Pseudoscalar
J(Ξc0) = 1/2 in Ξc
0 rest-frame m = ± 1/2 along z (quantization) axis
no angular momentum projection w.r.t. quantization axis Ω- helicity, λi = ± 1/2 final state helicity λf = λf (Λ0) - λf (pseudoscalar) = ± 1/2
Decay amplitude for Ω- → Λ0 K- :
Total Intensity:
ffifiADA JJ
)0,,(*
c0 → K+ - → 0 K-
J = 1/2m = + 1/2m = - 1/2
λi = + 1/2λi = - 1/2
λf = ± 1/2λK = 0
λK = 0
2*
,
2
,
)0,,(2
1
2
1ffi
fi
fi
fi
ADAI Ji
Ji
density matrix element for - spin projection i = density matrix element for charm baryon parent
Does not depend on i
[Wigner-Eckart theorem]
c0 -K+
K-
Helicity angle of Angle made by p() in rest frame with p(-) in c
0
rest frame
66 )cos5cos21(
)cos31(
1
42
2
I
I
I
Spin measurement of -
→ Fit Prob = 10 -17
→ Fit Prob = 0.64
→ Fit Prob = 10 -7
Background-SubtractedEfficiency-Corrected
J = 1/2
J = 5/2
J = 3/2
5cos9coscos314
1 I
cos314
1 I
22
2
Spin measurement of - from c0 → - K+, -
→ K- decays
Angular Distribution Parametrizations for JΩ=3/2 hypothesis
No Asymmetry
Asymmetry
Negligible Decay Asymmetry Parameter
Fit for→ = 0.04 ± 0.06
= 0.04 ± 0.06
Background-SubtractedEfficiency-Corrected
9
68
Spin measurement of c0 from c
0 → - +, - → 0 K- decaysFit parametrization α(1 + 3 cos2θ) for JΩ = 3/2 hypothesis
→ Fit Prob = 0.69; J(-) = 3/2, consistent with
results from c0 → - +
Background-subtractedEfficiency-corrected
Conclusion: J(-) = 3/2 [Assuming J(c0) , J(c
0) <5/2]
PRL version ready for review comm
Extending the Spin Formalism to 3-body Decays
The (1530)0 Spin from c+ → (- +) K+
also mass, width info. amplitude analysis (in progress)
The (1690)0 Spin from c+ → (0KS
0) K+
also mass, width info. amplitude analysis (to be done) (-p+)/(K0) Branching Ratio Limit
(to be done)
“…nothing of significance on resonances has been added since our 1988 edition.” [PDG(2004), p 967]
12
Study of and
70
Reconstructed c+
→ - + K+, - → 0 - Events
Data~230 fb-1
m(- +) ↔ c+ mass-signal region
m(- +) ↔ c+ mass-sideband region
. .
m(- +) ↔ (c+) mass-sideband-subtracted
Uncorrected
x
c+
-
0
-
p
-
K+
+
PID Information →Proton →Kaon →+, -
3-σ mass cut on intermediate states
intermd. states mass-constrained [, -]
L > +1.5 mm [sign outgoing].
r > +1.5 mm [sign outgoing].
dE/dx & Cherenkov info (DIRC)
(c+)Mass-sideband-
subtractedUncorrected
c+
→ - + K+
PDG mass
0 → - +
13
71
Resonant Structures in c+
→ - + K+, - → 0 -
Events Only obvious structure:
(1530) → - +
c+ signal region
72
Spin measurement of 0(1530) from c+
→ 0(1530) K+, 0(1530) → + decays
α(1 + 3 cos2θ) for J=3/2 hypothesisUncorrected cosθ Spectrum
0(1530) Signal Region
[Not mass-sideband-subtrated]
0(1530) Mass-Sideband Regions
Skewed distribution due to:• Efficiency loss at small angles Not big effect • system decay asymmetry S-P wave interference (next slides)
Clear 1+3cos2θ structure
73
For pure spin 3/2: dN/dcos = α(1 + 3 cos2)
c+ → + K+ Signal Region
Uncorrected
Legendre polynomials orthogonality condition
Weight = N x P2(cos)
Using the angular structure of (1530)0 → + candidates to project
away background events
Use of angular structure to project away the bkgr.
100
100
c+ Signal Region
c+ Low Mass-Sideband Region
c+ High Mass-Sideband Region
Projects mass distributionhaving cos2 component
No cos2 component in sideband distributions
sidebands
74
Evidence of S-P wave interference in the (- p+) system produced in the
decay c+ → - p+ K+
m( +) distribution weighted by P1(cos):
75
K +
Amplitudes describing the (- +) system:
quantization axis
c+ (- +) rest-frame
- - …….
+ ………….
l
S-P wave description of the (-+) system produced in the decay c
+ → + K+
1)1( 2/32/1 ,1
1)1( 2/12/1 ,1
1)1( 2/1 ,0
1
1
1
l
P
l
P
lS
ljlP
ljlP
jlS
f
f
f
)0,,()0,,()0,,(
2/1,2/1
2*2/3
*2/1
*2/1
f
i
ffiffiffiPDPDSDi
)( system ofhelicity where,
theof populationspin thedescribing elementsmatrix density 1/2)(i
c
c
-f
ii
i
Total Intensity ~
76
.2
1cos3RecosRe2
cosRe24
cos31 I
)()()()()()(2
1
)()()()()()(2
1
)()()()()()(
)()()()()()(
where)0,,()0,,()0,,( I
2*2/12/1
*2/12/12/12/1
*2/12/1
22
2/1
2
2/1
2
2/12/12/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/12/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/12/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/12/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/1
2
2/12/3
2/1 2/12/12/1
2/1 2/12/12/1
2/1 2/12/1
2/1,2/1
2*2/3
*2/1
*2/1
PSPS
PSPPS
PdPdSdPdPdSd
PdPdSdPdPdSd
PdPdSdPdPdSd
PdPdSdPdPdSd
PDPDSD fi
f
i
ffiffiffi
Helicity Formalism (3)
)2/3( 1 );2/1( 1
0) ,2/1 1/2, ;1 ,1( 1
:onconservatiParity
j PP)(Pj -PP)(P
SSjSS)(S
ff
πΞ
fff
πΞ
f
ff
πΞ
f
λSSj
PλSSj
P
SSjS
0(Assume 1/2= -1/2)
Assume ~0 to extract cos
S-P interference
S-1/2 = S1/2
P--1/2 = -P-
-1/2
P+-1/2 = P+
1/2
77
c+
J=1/2
0(1530)J=3/2
p
qK+ (1530)
-
L = 2, 1
l = 1 [(+) parity]
…towards a measurement of the mass & width of 0(1530)
Fit Params:
M: 1531.6 ± 0.1 (stat.)
: 11.9 ± 0.2 MeV
Fit with relativistic Breit-Wigner Function with L=2 & l =1[incorporating a Blatt-Weisskopf barrier factor (R~ 5 (GeV)-1) and resolution “smearing”]
l
tot
L qmmmm
pm
q
m
pm
dm
dN
c
2
220
2220
2
)(
1.
pp
P2(cos) weighted
Uncorrected
PDG:
M: 1531.80 ± 0.32
: 9.1 ± 0.5 MeV(Very preliminary)
In progress
78
Uncorrected
Reconstructed c+ → 0 KS
0 K+ Events
(c+)Mass-sideband-
subtracted0 → 0 KS
0
Data~200 fb-1 Uncorrected
m(0 KS0) ↔ c
+ mass-signal region
m(0 KS0) ↔ c
+ mass-sideband region . .
m(0 KS0) ↔ (c
+) mass-sideband-subtracted
c+
→ 0 KS0 K+
c+
→ 0KS0K+
Low-mass sideband limit
79
S-Wave Breit-Wigner Function (& Linear bkgr.)with resolution “smearing”
…towards a measurement of the mass & width of (1690) → 0 KS0
Background-subtractedUncorrected
Fit Params:
M: 1684.7 +- 0.9 (stat.)
: 12.0 +- 0.2 MeV
Only “obvious” structure: (1690) → 0 KS
0
c+
Uncorrected
Stop fit at 1.76
(Very preliminary)
23
80
[Uncorrected] Background-Subtracted cosθ Spectrum~Flat consistent with J=1/2 hypothesis
Spin measurement of (1690)0 from c+ → (1690)0 K+, 0(1690) → 0KS
0 decays
Spin hypothesis:Weight signal events
by P2(cos)
c+ signal region
Uncorrected
α(1 + 3 cos2θ) for J=3/2 hypothesis [prob = 0.2]
α(1) for J=1/2 hypothesis [prob = 0.9]
m(KS) distribution weighted by P2(cos)
c+ signal events
Uncorrected
No cos2 component anywhere Spin 1/2
Spin 1/2 favored
Direct Method:
- Extract signal cos distribution - Requires large sideband subtraction
Inconclusive
Indirect Method:
24
81
Uncorrected (- +) invariant mass[ c
+ → - + K+ ]
No signal for (1690)0 → - +
Uncorrected (0 KS0) invariant mass
c+
→ 0 KS0 K+ ]
Clear signal for (1690)0 → 0 KS0
…towards an U.L. on BR( (1690)0 → - + )/BR (1690)0 → 0 KS0 )
Background-subtracted
Background-subtracted
c+
→ 0 KS0 K+
c+
→ - + K+
82
*0 Production in c+ & c
Decays
cancel
83
Investigation of c+,0 Decays
to 3-body Final States
c+ → - + +
c+ → 0 KS
0 + c
0 → 0 K- +
84
… Reconstructing c+ → 0 KS
0 + Events
Data
~200 fb-1
S = 0 S = -1
Cabbibo-suppressed c+ → 0 K0 +
85
“Obvious” resonant structures
(1385)+
Large K*(892) contrib.
c+ → 0 K0 + Dalitz Plot Analysis
Uncorrected
Uncorrected
● Previously observed C.S. mode: c+ → + K*(892)0
K*(
892)
Yie
ld/ 1
0 M
eV/c
2
Evidence for the decay c+ → 0 K*(892)+
K(892)+→ KS0+
→ 0 +
Mass-sideband-subtracted
Mass-sideband-subtracted
86
Excited Charm Baryons
87
Excited
c States
L=0 straightforward
88
89
X(3872): BELLE Finds Data Disfavors 0++ and 2++, Leaving 1++
cc ? 1++ is c1’
X(3872) is too light
M[Ge
DDThreshold
3872
Solid lines: ExperimentLeft: NR model, Barnes, Godfrey, SwansonRight: “Relativized” model, Godfrey, Isgur(Spin) Singlets: dotted, Triplets: dashed
90Detector Tomography with pKS0 vertices
230 fb -1BABAR
e- e+
91
92
93
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