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B Physics Conveners:
Giovanni Punzi
Michal Kreps


Run 2 Results

New Results Older Preliminary Results Published results

Please note that some results appear in several sections.

NEW

Result (pb-1) Paper/Note
Observation of Ωb and measurement of properties of Ξb and Ωb m(Ωb)=6054.4 ± 6.8 (stat.) ± 0.9 (syst.) MeV/c2
m(Ξb)=5790.9 ± 2.6(stat.) ± 0.8(syst.) MeV/c2
τ(Ωb)=1.13+0.53-0.40(stat.) ± 0.02(syst.) ps
τ(Ξb)=1.56+0.27-0.25(stat.) ± 0.02(syst.) ps
4200
arXiv:0905.3123
09-05-14
Submitted to PRD
σBc*BR(Bc → J/ψ μ X) σBc(pt>6.0GeV)*BR(Bc → J/ψ μ ν) / σB+*BR(B+ → J/ψK)
= 0.227 ± 0.033(stat) +0.024-0.017(sys) ± 0.014(pt spectrum)
1000
Public Note 9740
09-03-05
Previous results:
Note 7649 (360 pb-1)
Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum m = 4143.0 ± 2.9 (stat.) ± 1.2(syst.) MeV/c2
Γ = 11.7 +8.3 -5.0 (stat.) ± 3.7(syst.) MeV/c2
2700
Phys. Rev. Lett. 102, 242002 (2009)
09-03-05
Updated Measurement of CP Violating Phase βsJ/ψφ βs within [0.28, 1.29] at 68% C.L.
p-value(SM) = 0.07 (~1.8 σ)
ΔΓs = 0.02 ± 0.05 (stat) ± 0.01 (syst) ps-1
2800
Public Note 08-07-24
Prev. results:
PRL 100, 161802 (2008)
PRL 100, 121803 (2008)
/\b Lifetime in /\b → /\c π Decays cτ(/\b) = 420.1 ± 13.7(stat.) ± 10.6 (syst.) μm
τ(/\b)/τ(B0) = 0.916 ± 0.038
1070
Public Note
09-04-16
Search for Lepton Flavor Violating Decays Bs,d → eμ BR(Bs0 → eμ) < 2.6*10-7 (95%CL)
BR(Bd0 → eμ) < 7.9*10-8 (95%CL)
2000
Phys. Rev. Lett. 102, 201801 (2009)
Mass Measurement of the X(3872) State m(X(3872)) = 3871.61 ± 0.16 ± 0.19 MeV/c2
Δ m < 3.2 (3.6) MeV/c2 at 90% (95%) C.L.
2400
arXiv:0906.5218
08-07-24
Submitted to PRL
Prev. results:
PRL, hep-ex/0612053
PRL 96, 102002 2006

Mixing and CP Violation

Result (pb-1) Paper/Note
Updated Measurement of CP Violating Phase βsJ/ψφ βs within [0.28, 1.29] at 68% C.L.
p-value(SM) = 0.07 (~1.8 σ)
ΔΓs = 0.02 ± 0.05 (stat) ± 0.01 (syst) ps-1
2800
Public Note 08-07-24
Prev. results:
PRL 100, 161802 (2008)
PRL 100, 121803 (2008)
ACP and BR of Λb Charmless 2-Body Decays ACPb→ pπ)=0.03± 0.17± 0.05
ACPb→ pK)=0.37 ± 0.17 ± 0.03
Derived: BR(Λb→ pπ)=(3.1± 0.6± 0.7)x10-6
(PDG) BR(Λb→ pK)=(5.0± 0.7± 1.0)x10-6
1100
Public Note
07-10-18
Measurements of Branching Fractions and CP Asymmetries in B- → D0CPK- Decays R = 0.0745 ± 0.0043 (stat) ± 0.0045 (sys)
RCP+ = 1.30 ± 0.24 (stat) ± 0.12 (sys)
ACP+ = 0.39 ± 0.17 (stat) ± 0.04 (sys)
1100
Public Note
07-10-18
rev. 08-07-24
Evidence of Charm Mixing Rd=3.04± 0.55 (10-3)
Y'=8.5 ± 7.6 (10-3)
X'2=-0.12 ± 0.35 (10-3)
1500
Phys. Rev. Lett. 100, 121802 (2008)
CP Asymmetry in semileptonic B decays ASL=0.0080 ±0.0090 ± 0.0068
ASSL=0.020 ±0.021 ± 0.018
1600
Note 9015 07-08-16
Measurement of branching fractions and direct CP-asymmetries of B0(s)->h+h- decays observation: B0s→K-π+, Λ0b→pπ- and Λ0b→pK-
ACP(B0s→K-π+) = 0.39 ± 0.15 ± 0.08
ACP(B0→K+π-) = -0.086 ± 0.023 ± 0.009
B0(s)->h+h- decays: BF and limits
1000
Note 8579
06-09-21 (rev. 08-04-10)
Prev. Result:
PRL 97, 211802 2006
Measurement of B0 Oscillations and Calibration of Flavor Tagging in Semileptonic Decays
Δ md = 0.509 ± 0.010 ± 0.016ps-1
ε D2 = 1.54 ± 0.05
1000 Note 8235 06-04-06
Observation of Bs - Bs Oscillations Δms = 17.77 ± 0.10 (stat) ± 0.07(sys)
|Vtd|/|Vts| = 0.2060 ± 0.0007(stat+sys) +0.0081-0.0060(theo)
1000
PRL 97, 242003 2006
Prev. Result:
PRL 97, 062003 2006
Observation of Bs → K+K-
Measurement of B → hh BRs and
CP Asymmetry in B0 → K+π-

ACP+ K- - K+π-) = -0.013 ± 0.078 ± 0.012
BR(Bs → K+K-) = 33 ± 5.7 ± 6.7*10-6
180
PRL 97, 211802 2006
New Prel. Result
First observation of Bs -> φφ
Branching fraction and direct CP asymmetry in B+ -> φ K+
BR(Bs->φφ) = (1.4 ±0.6 ± 0.2 ± 0.5(BR))*10-5
BR(B+ → φ K) / BR(B+ → Jψ K) =
0.0076 ± 0.0013 ± 0.0006
ACP = -0.07 ± 0.17 +0.03-0.02
180
PRL 95 031801 2005
Relative Branching Fractions and search for CP Asymmetry for D0 -> Kπ/KK/ππ
ACP(KK) = 2.0 ± 1.2 ± 0.6
ACP(ππ) = 1.0 ± 1.3 ± 0.6
123
PRL 94, 122001 2005

Lifetimes

Result (pb-1) Paper/Note
Observation of Ωb and measurement of properties of Ξb and Ωb m(Ωb)=6054.4 ± 6.8 (stat.) ± 0.9 (syst.) MeV/c2
m(Ξb)=5790.9 ± 2.6(stat.) ± 0.8(syst.) MeV/c2
τ(Ωb)=1.13+0.53-0.40(stat.) ± 0.02(syst.) ps
τ(Ξb)=1.56+0.27-0.25(stat.) ± 0.02(syst.) ps
4200
arXiv:0905.3123
09-05-14
Submitted to PRD
/\b Lifetime in /\b → /\c π Decays cτ(/\b) = 420.1 ± 13.7(stat.) ± 10.6 (syst.) μm
τ(/\b)/τ(B0) = 0.916 ± 0.038
1070
Public Note
09-04-16
Updated Measurement of CP Violating Phase βsJ/ψφ βs within [0.28, 1.29] at 68% C.L.
p-value(SM) = 0.07 (~1.8 σ)
ΔΓs = 0.02 ± 0.05 (stat) ± 0.01 (syst) ps-1
2800
Public Note 08-07-24
Prev. results:
PRL 100, 161802 (2008)
PRL 100, 121803 (2008)
B+ Lifetime in B+ D0π+ τ(B+) = 1.662 ± 0.023 (stat.) ± 0.015 (syst.) ps 1000
Public Note
08-06-12
Measurement of Bc± Lifetime in Semileptonic Decays cτ(Bc) = 142.5 +15.8-14.8(stat.) ± 5.5 (syst.) μm
1000
Public Note
08-03-27
Measurement of the Bs Lifetime in hadronic Bs0 → Ds- (φ π-+ Decays cτ(Bs) = 455.0 ± 12.2 (stat.) ± 8.2 (syst.) μm 1300
Public Note
08-02-07
revised 08-10-23
Lifetime difference and CP violating phase in Bs → J/ψ φ decays ΔΓ = 0.076+0.059-0.063(stat.) ± 0.006 (syst.) ps-1
Results with CP phase floating
1700
PRL 100, 121803 (2008) 07-08-09
Prev. result (260 pb-1)
PRL 94, 101803 2005
Measurement of Exclusive B Lifetime in the modes B + → J/ψ K+, B0 → J/ψ K*0, B0 → J/ψ K0s, B0s → J/ψ φ and /\b → J/ψ /\, and lifetime ratios τ(B+) = 1.630 ± 0.016(stat.) ± 0.011 (syst.) ps
τ(B0) = 1.551 ± 0.019(stat.) ± 0.011 (syst.) ps
τ(B0s) = 1.494 ± 0.054(stat.) ± 0.009 (syst.) ps
τ(/\b) = 1.580 ± 0.077 (stat.) ± 0.012 (syst.) ps
τ(B+)/τ(B0) = 1.051 ± 0.023 ± 0.004 (syst.)
τ(B0s)/τ(B0) = 0.963 ± 0.047 ± 0.005 (syst.)
τ(/\b)/τ(B0) = 1.018 ± 0.062 ± 0.007 (syst.)
1000
Note 8524 06-11-30
Prev. Result:
Phys. Rev. Lett. 98, 122001 (2007)
Bs meson lifetime and Δ Γ
(excl. reconstruction in Bs → K+K - decays)

τBs→ K+K - = 1.53 ± 0.18 ± 0.02 ps
ΔΓCPCP(Bs→ K+K-) = -0.08 ± 0.23 ± 0.03
360
Note 06-01-26
B0s meson lifetime
(part. reconstruction in semileptonic decays)

τB0s= 1.381 ± 0.055 +0.052-0.046ps
τB0sB0 = 0.938 ± 0.044 +0.049-0.046
360
Note 7757 05-07-07
B+, B0 and Bs meson lifetimes
(excl. reconstruction in hadronic decays)

τB+= 1.66 ± 0.03 ± 0.01ps
τB0= 1.51 ± 0.02 ± 0.01ps
τBs= 1.60 ± 0.10 ± 0.02ps
τB+B0 = 1.10 ± 0.02 ± 0.01
τBsB0 = 1.06 ± 0.07 ± 0.01
360
Note 05-03-03
B+ and B0 meson lifetimes
(part. reconstruction in semileptonic decays)

τB+= 1.653 ± 0.029 +0.033-0.031ps
τB0= 1.473 ± 0.036 ± 0.054ps
τB+B0 = 1.123 ± 0.040 +0.041-0.039
260
Note 05-02-24
/\b meson lifetime
(excl. reconstruction in /\b → J/ψ /\ decays)

τ/\b= 1.593 +0.083-0.078 ± 0.033 ps
τ/\bB0 = 1.037 ± 0.058
1000
PRL, hep-ex/0609021
New Prel. Result
Bc meson lifetime
(part. reconstruction in semileptonic decays)

τBc= 0.463 +0.073-0.065 ± 0.036 ps 360
PRL 97, 012002 2006
Time-Dependent Amplitude Analysis of Bs → J/ψ φ and B0 → J/ψ K*0 Decays and a Lifetime Difference in the Bs System
ΔΓ/Γ = 0.65+0.25-0.33 ± 0.01
260
PRL 94, 101803 2005
New Preliminary (1.5/fb)

Decays

Result (pb-1) Paper/Note
Search for Lepton Flavor Violating Decays Bs,d → eμ BR(Bs0 → eμ) < 2.6*10-7 (95%CL)
BR(Bd0 → eμ) < 7.9*10-8 (95%CL)
2000
Phys. Rev. Lett. 102, 201801 (2009)
Search for the Rare Decay D0 → μ+ μ- BR(D0 → μ+ μ-) < 5.3*10-7 (95%CL)
360
Public Note
08-02-28
ACP and BR of Λb Charmless 2-Body Decays ACPb→ pπ)=0.03± 0.17± 0.05
ACPb→ pK)=0.37 ± 0.17 ± 0.03
Derived: BR(Λb→ pπ)=(3.1± 0.6± 0.7)x10-6
(PDG) BR(Λb→ pK)=(5.0± 0.7± 1.0)x10-6
1100
arXiv:0812.4271
Accepted by PRL
Measurement of branching fractions and direct CP-asymmetries of B0(s)->h+h- decays observation: B0s→K-π+, Λ0b→pπ- and Λ0b→pK-
ACP(B0s→K-π+) = 0.39 ± 0.15 ± 0.08
ACP(B0→K+π-) = -0.086 ± 0.023 ± 0.009
B0(s)->h+h- decays: BF and limits
1000
arXiv:0812.4271
Accepted by PRL
Prev. Result:
PRL 97, 211802 2006
Measurements of Branching Fractions and CP Asymmetries in B- → D0CPK- Decays R = 0.0745 ± 0.0043 (stat) ± 0.0045 (sys)
RCP+ = 1.30 ± 0.24 (stat) ± 0.12 (sys)
ACP+ = 0.39 ± 0.17 (stat) ± 0.04 (sys)
1100
Public Note
07-10-18
rev. 08-07-24
Angular Analysis of B0 → J/ψ K*0 Decays |A0|2 = 0.569 +/- 0.009 (stat) +/- 0.009 (syst)
|A|||2 = 0.211 +/- 0.012 (stat) +/- 0.006 (syst)
δ|| = -2.97 +/- 0.08 (stat) +/- 0.03 (syst)
δ = 2.97 +/- 0.06 (stat) +/- 0.01 (syst)
1700
Public Note
07-08-30
Prev. result (260 pb-1)
PRL 94, 101803 2005
Search for FCNC Rare Decay: Bs,d → μ+ μ-
BR(Bs → μ+ μ-) < 5.8*10-8 95%CL
BR(Bd → μ+ μ-) < 1.8*10-8 95%CL
2000
PRL 100,101802 (2008)
Prev. Results:
Note 8176 (780 pb-1)
PRL 95, 221805 2005
PRL 93, 032001 2004
First observation and measurement of Bs → D s K branching fraction Br(Bs0 →Ds±K+) / Br(Bs0 →Ds+π) =
0.107 ± 0.019(stat) ± 0.008(sys)
1200
arXiv:0809.0080
Submitted to PRL
Search for the rare decays B+ → μ+μK+, B0 → μ+μK*0, and Bs → μ+μφ B(B+ → μ+μK+) = (0.60 ± 0.15 ± 0.04)×10-6
B(B0 → μ+μK*0) = (0.82 ± 0.31 ± 0.10)×10-6
B(Bs → μ+μφ)/ B(Bs → J/ψφ) < 2.61(2.30)×10-3 at 95(90)%CL.
924
Phys. Rev. D79, 011104(R) (2009)
Measurement of the branching ratio of D+ → ππ+π+ B(D+ → ππ+π+)/ B(D+ → Kπ+π+) =
(3.461 ± 0.038 ± 0.040 )%
B(D+ → ππ+π+) = (3.29± 0.11)10− 3
193
Note 8499 06-08-31
B to Vector Vector Polarization in
Bd --> JPsi K* and Bd --> PhiK*
Table of Polarization Amplitudes 360 Note 8501 06-07-20
Observation of exclusive decay Bs → Ds Ds R(Bs → DsDs ) / BR(B0 → DsD+ ) = 1.67 ± 0.41 ± 0.12 ± 0.24 (fs/fd) ± 0.39(BR) 355
Phys. Rev. Lett. 100, 021803 (2008)
Ratio of Branching Fractions
BR(B0 → DsD+) / BR(B0 → D+-)
and BR(B0 → Ds(*)D+(*)) / BR(B0 → D+-)

BR(B0 → DsD+) / BR(B0 → D+3π) =
1.99 ± 0.13 ± 0.11
± 0.44(BR Ds → φπ) ± 0.08(other BR)
355
Phys. Rev. Lett. 98, 061802 (2007)
Measurement of the Ratio of Brancing Fractions R=BR(B-->D0K-)/BR(B-->D0π-) R = 0.065 ± 0.007 (stat) ± 0.004 (sys) 360
Note 8242 06-04-20
Ratio of Branching Fractions
BR(B+ → J/psiπ+) / BR(B+ → J/psi K+)

BR(B+ → J/psiπ+) / BR(B+ → J/psi K+) =
4.86 ± 0.82 ± 0.15
210
arXiv:0905.2146 Accepted by PRD
Ratio of Branching Fractions:
BR(Λb → Λc+μ-ν) /BR(Λb→ Λc+π-)

BR(Λb → Λcμ- ν) / BR(Λb → Λcπ-) =
16.6 ± 3.0 ± 1.0 +2.6-3.4(PDG) ± 0.3(EBR)

BR(B0 → D*-μ+ ν) / BR(B0 → D*-π+) =
16.5 ± 2.3 ± 0.6 ± 0.5(PDG) ± 0.8(EBR)

BR(B0 → D-μ+ ν) / BR(B0 → D-π+) =
9.9 ± 1.0 ± 0.6 ± 0.4(PDG) ± 0.5(EBR)
172
Phys. Rev. D79, 032001 (2009)
Observation of Bs → K+K-
Measurement of B → hh BRs and
CP Asymmetry in B0 → K+π-

ACP+ K- - K+π-) = -0.013 ± 0.078 ± 0.012
BR(Bs → K+K-) = 33 ± 5.7 ± 6.7*10-6
180
PRL 97, 211802 2006
New Prel. Result
D0 → K+ π - Wrong Sign DCS Decays
R(WS/RS) = 4.05 ± 0.21 (stat) ± 0.12 (sys) × 10-3 350
PRD RC 74, 031109 2006
Observation of Decay Bs → ψ (2S) φ
BR(Bs → ψ (2S) φ / Bs → J/ψ φ =
0.52 ± 0.13 ± 0.04 ± 0.06(BR)
360
PRL 96, 231801 2006
Ratio of Branching Ratios for Λb → Λcπ/B0 → D+π-
σΛb(pT > 6)*BR(Λb → Λcπ) / σB0(pT > 6)*BR(B0 → D+π-) = 0.82 ± 0.08 ± 0.11 ± 0.22(Λc BR) 106
PRL 98, 122002 2007
Ratio of Branching Ratios for Bs/B0 and B+/B0
BR(Bs → Dsπ) / BR(B0 → D-π) =
1.13 ± 0.08 ± 0.23
BR(Bs → Dsπππ) / BR(B0 → D-πππ) =
1.05 ± 0.10 ± 0.22
355

PRL 98, 061802 2007
Prev. Result (115pb-1):
PRL 96, 191801 2006
Search for FCNC Rare Decay: Bs → μ+ μ-
BR(Bs → μ+ μ-) < 2.0*10-795%CL
364
PRL 95, 221805 2005
Prev. Result:
PRL 93, 032001 2004
New Prel. Result
Search for Λb in pK and pπ decays
BR(Λb → hh) < 2.3*10-590%CL
193
PRD 72, 051104 2005
Hadronic Moments in Semileptonic B Decays
M1 and M2
180
PRD RC 71, 051103 2005
First observation of Bs -> φφ
Branching fraction and direct CP asymmetry in B+ -> φ K+
BR(Bs->φφ) = (1.4 ±0.6 ± 0.2 ± 0.5(BR))*10-5
BR(B+ → φ K) / BR(B+ → Jψ K) =
0.0076 ± 0.0013 ± 0.0006
ACP = -0.07 ± 0.17 +0.03-0.02
180
PRL 95 031801 2005
Relative Branching Fractions and search for CP Asymmetry for D0 -> Kπ/KK/ππ
ACP(KK) = 2.0 ± 1.2 ± 0.6
ACP(ππ) = 1.0 ± 1.3 ± 0.6
123
PRL 94, 122001 2005
Time-Dependent Amplitude Analysis of Bs → J/ψ φ and B0 → J/ψ K*0 Decays and a Lifetime Difference in the Bs System
ΔΓ/Γ = 0.65+0.25-0.33 ± 0.01
260
PRL 94, 101803 2005
New Preliminary (1.5/fb)
Search for FCNC Rare Decay: D0 → μ+ μ-
BR(D0 → μ+ μ-) < 2.5*10-690%CL
69
PRD 68, 091101 2003

Production

Result (pb-1) Paper/Note
σBc*BR(Bc → J/ψ μ X) σBc(pt>6.0GeV)*BR(Bc → J/ψ μ ν) / σB+*BR(B+ → J/ψK)
= 0.227 ± 0.033(stat) +0.024-0.017(sys) ± 0.014(pt spectrum)
1000
Public Note 9740
09-03-05
Previous results:
Note 7649 (360 pb-1)
Measurement of ψ(2S) Production Cross Section σ inc.(pp → ψ(2S)X,|y(ψ(2S))| < 0.6, pT > 2 GeV/c)1.96 · Br(ψ(2S) → μμ) =
3.14 ± 0.04(stat)+0.23-0.22(syst) nb
1100
arXiv:0905.1982
Submitted to PRD
07-10-18
Measurement of the correlated bb production in pp collision at 1960 GeV σb→μ,b→ μ ( pT b > 2GeV,|y|b<1.3; pTμ>3GeV, |η|μ<0.7)
= 1549 ± 133 pb
742
Phys. Rev. D77, 072004 (2008)
Measurement of Charm Meson pair Cross Sections Plots of Charm Cross Sections 1000 Note 8621 06-09-21
Relative cross sections of χc1 and χc2 σ(χc2)/σ(χc1) = 0.70 ± 0.04 ± 0.04 ± 0.06 (B.F.), for prompt production
σ(χc2)/σ(χc1) = 0.25 ± 0.07± 0.01± 0.02 (B.F.), for B decay
1100 Phys. Rev. Lett. 98, 232001 (2007)
Measurement of b production cross section using Hb → μD0(*)channels
(Hb is an admixture of b hadrons)
σ(pp→Hb) × BR(Hb→μ- D0 X) × BR(D0→π+K- )
= 3.53 nb ± 0.20 nb (stat.) +0.34 -0.36 (syst.) nb
σ(pp→Hb) × BR(Hb→μ- D*+ X) × BR(D*+→D0π+ )× BR(D0→π+K- )
= 1.04 nb ± 0.13 nb (stat.) +0.12 -0.14 (syst.) nb
83
Phys. Rev. D79, 092003 (2009)
Relative B Hadron Fragmentation Fractions fu/fd = 1.054 ± 0.018
+0.025-0.045(sys) ± 0.082 (BR)
fs/(fu+fd) = 0.160 ± 0.005
+0.011-0.010(sys) +0.057-0.034 (BR)
f/\b/(fu+fd) = 0.281 ± 0.012
+0.058-0.056(sys) +0.127-0.086 (BR)
360
Phys. Rev. D77, 072003 (2008)
Charged Particle Production in Association with B0,B+,Bs0 Mesons Fraction of associated K for Bs0: 20.2 ± 1.2 ± 0.3 % 355
Note 8137 05-10-13
σBc*BR(Bc → J/ψ e X)
σBc(pt>4.0GeV)*BR(Bc → J/ψ e X) / σB+*BR(B+ → J/ψK)
= 0.282 ± 0.038 ± 0.065 ± 0.035(sys-yield)
σBc(pt>6.0GeV)*BR(Bc → J/ψ e X) / σB+*BR(B+ → J/ψK)
= 0.242 ± 0.036 ± 0.051 ± 0.031(sys-yield)
360
Note 7926 05-04-07
Measurement of the J/ψ Spin Alignment from Prompt and B Decays
and Measurement of the ψ(2S) Spin Alignment from Prompt and B Decays
αB(J/ψ)=-0.066 ± 0.050
αPrompt(J/ψ) Longitudinal at higher pT
αB(ψ2S)=0.28 ± 0.27 ± 0.03
αPrompt(ψ2S) Longitudinal at higher pT
800
PRL 99, 132001 (2007)
Exclusive B+→ J/ψ K+ cross section σ(pT> 6GeV/c, |y|< 1) = 2.78 ± 0.24 (stat+sys) μb 740 PRD 75, 012010 2007
Measurement of the J/ψ Meson and b Quark Production Cross Sections and J/ψ Only
Results
40
PRD 71, 032001 2005
Direct Charm Meson Production Cross Section
Cross Sections
5.8
PRL 91, 241804 2003

Spectroscopy

Result (pb-1) Paper/Note
Observation of Ωb and measurement of properties of Ξb and Ωb m(Ωb)=6054.4 ± 6.8 (stat.) ± 0.9 (syst.) MeV/c2
m(Ξb)=5790.9 ± 2.6(stat.) ± 0.8(syst.) MeV/c2
τ(Ωb)=1.13+0.53-0.40(stat.) ± 0.02(syst.) ps
τ(Ξb)=1.56+0.27-0.25(stat.) ± 0.02(syst.) ps
4200
arXiv:0905.3123
09-05-14
Submitted to PRD
Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum m = 4143.0 ± 2.9 (stat.) ± 1.2(syst.) MeV/c2
Γ = 11.7 +8.3 -5.0 (stat.) ± 3.7(syst.) MeV/c2
2700
Phys. Rev. Lett. 102, 242002 (2009)
09-03-05
Mass Measurement of the X(3872) State m(X(3872)) = 3871.61 ± 0.16 ± 0.19 MeV/c2
Δ m < 3.2 (3.6) MeV/c2 at 90% (95%) C.L.
2400
arXiv:0906.5218
08-07-24
Submitted to PRL
Prev. results:
PRL, hep-ex/0612053
PRL 96, 102002 2006
Search for Narrow Resonances below the ϒ Mesons Γl < 10 eV for 6.3 < m(μμ) < 9 GeV/c2
(90% CL)
630
arXiv:0903.2060
Submitted to PRL
08-06-12
Mass and width measurement of orbitally excited (L=1) B**0 mesons
Γ(B2*0) = 22.7+3.8-3.2 (stat.) +3.2-10.2 (syst.) MeV/c2
m(B10) = 5725.3+1.6-2.2 (stat.) +1.4-1.5 (syst.) MeV/c2
m(B2*0) = 5740.2+1.7-1.8 (stat.) +0.9-0.8 (syst.) MeV/c2
1700
Phys. Rev. Lett. 102, 102003 (2009)
Previous analysis (370/pb)
Note 7938
Observation of the exclusive decay Bc to J/ψ π and mass measurement
m(B)c = 6275.6 ± 2.9 ± 2.5 MeV/c2 2400
Phys. Rev. Lett. 100, 182002 (2008)
Prev. prelim. results:
2.2/fb 07-07-12
1.1/fb 06-05-25
Published 360/pb
PRL 96, 082002 2006
Observation and mass measurement of the Ξb baryon
M(Ξb)=5,792.9 ± 2.5 (stat.) ± 1.7 (syst.) MeV/c2 1900
Phys. Rev. Lett. 99, 052002 (2007)
Observation of New Heavy Baryon Σband Σb* m(Σb+)  = 5808+2.0-2.3 ± 1.7 MeV/c2
m(Σb¯) = 5816+1.0-1.0 ± 1.7 MeV/c
m(Σb*+) = 5829+1.6-1.8 ± 1.7 MeV/c2
m(Σb) = 5837+2.1-1.9 ± 1.7 MeV/c2
1100 PRL 99, 202001 (2007)
06-09-21
Observation of orbitally excited (L=1) Bs** mesons Q1 = 10.73 ± 0.21 ± 0.14 MeV/c2
Q2 = 66.96 ± 0.39 ± 0.14 MeV/c2
m(Bs1) = 5829.41 ± 0.21 ± 0.14 ± 0.6 (PDG) MeV/c2
m(Bs2*) = 5839 ± 0.39 ± 0.14 ± 0.5 (PDG) MeV/c2
1000 Phys. Rev. Lett. 100, 082001 (2008)
Search for ηb decay into J/ψ J/ψ σ(pp→ ηb, |y|<0.6, pT 3GeV) * BR < 2.6pb 1000 Note 8448 06-06-15
Study of the Lifetime Distribution of the X(3872)
Fbdecay = 16.9 ± 4.9 ± 2.0% 220
Note 7159
04-06-24
Pentaquark search in the channel J/ψ p
Results
280
Note 04-08-19
Pentaquark search in the channel Θc → Dxp
Results
240
Note 04-04-28
Pentaquark search in the channel Θ+ → p K0s
Results
180
Note 04-04-28
Quantum Numbers of the X(3872) JPC = 1++ or 2-+ 780
PRL, hep-ex/0612053
Search for Exotic S=-2 Baryons (Pentaquarks)
Results
220
PRD 75 , 032003 2007
B Hadron Mass Measurements
mB+ = 5279.10 ± 0.41 ± 0.36MeV
mB0 = 5279.63 ± 0.53 ± 0.33MeV
mBs = 5366.01 ± 0.73 ± 0.33MeV
mΛb = 5619.7 ± 1.2 ± 1.2MeV
220
PRL 96, 202001 2006
Measurement of orbitally-excited charm states D1 and D2
mD1 = 2421.7 ± 0.7 ± 0.6MeV
ΓD1 = 20.0 ± 1.7 ± 1.2 MeV
mD2 = 2463.3 ± 0.6 ± 0.8MeV
ΓD2 = 49.2 ± 2.3 ± 1.3 MeV
210
PRD RC 73, 051104 2006
Measurement of the Dipion Mass Spectrum in X(3872) -> J/ψ π π Decay
Dipion Mass Spectrum 360
PRL 96, 102002 2006
Evidence for exclusive decay Bc to J/J/ψ π and mass measurement
mBc = 6285.7 ± 5.3 ± 1.2MeV 360
PRL 96, 082002 2006
Observation and Mass Measurement of the X(3872)
mX(3872) = 3871.3 ± 0.7 ± 0.4MeV 220
PRL 93, 072001 2004
Measurement of the D+,Ds Mass Difference Using D+/Ds -> φπ
m(Ds)-m(D+) = 99.41 ± 0.38 ± 0.21
11.6 PRD 68, 072004 2003

PR Results

Result (pb-1) Paper/Note
X → J/ψ pi pi: J/ψ → e+e- Results
360
05-06-09
Di Muon Trigger Signals
Mass Plot
360
04-09-30
J/ψ → μ μ Signals
Mass and Lifetime
293
04-08-05
Combined Opposite Side Tagger
ε D2 = 1.8% - Note 8460 06-06-29
Same Side Kaon Tagger
ε D2 = 4.0 + 0.9 - 1.2% - Note 8206 06-03-02
Opposite Side Kaon Tagger
ε D2 = 0.229 ± 0.016 ± 0.001% 355
Note 8241 06-04-13
Neural Network based Jet Charge Tagger in Semileptonic(e,mu) Samples
ε D2 = 0.917 ± 0.031%(electron)
ε D2 = 0.938 ± 0.029%(muon)
355
Note 05-03-03
Improved Jet Charge Tagging in the Semileptonic Sample
ε D2 = 0.715 ± 0.027%
290
Note 04-08-12
Likelihood Based Soft Electron Tagging
ε D2 = 0.366 ± 0.031 +0.065-0.056%

Note 04-08-12
Likelihood Based Soft Muon Tagging
ε D2 = 0.698 ± 0.042 +0.051-0.027%

Note 04-07-22
Sample Composition of Semileptonic B Events
60 03-06-26