Evidence for CP Violation in B^{0}→J/ψπ^{0} Decays

B Aubert; Christopher Hawkes; Nitesh Soni; Alan Watson

doi:10.1103/PhysRevLett.101.021801

Evidence for CP Violation in B^{0}→J/ψπ^{0} Decays

B Aubert, Christopher Hawkes, Nitesh Soni, Alan Watson

Physics and Astronomy

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Abstract

We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).

Original language	English
Article number	021801
Journal	Physical Review Letters
Volume	101
Issue number	2
Early online date	1 Jul 2008
DOIs	https://doi.org/10.1103/PhysRevLett.101.021801
Publication status	Published - 1 Jul 2008

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title = "Evidence for CP Violation in B^{0}→J/ψπ^{0} Decays",

abstract = "We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).",

author = "B Aubert and Christopher Hawkes and Nitesh Soni and Alan Watson",

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doi = "10.1103/PhysRevLett.101.021801",

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T1 - Evidence for CP Violation in B^{0}→J/ψπ^{0} Decays

AU - Aubert, B

AU - Hawkes, Christopher

AU - Soni, Nitesh

AU - Watson, Alan

PY - 2008/7/1

Y1 - 2008/7/1

N2 - We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).

AB - We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).

U2 - 10.1103/PhysRevLett.101.021801

DO - 10.1103/PhysRevLett.101.021801

M3 - Article

SN - 1079-7114

VL - 101

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 021801

ER -

Evidence for CP Violation in B^{0}→J/ψπ^{0} Decays

Abstract

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