Measurements of Time-Dependent CP Violation in Radiative B Meson Decays at BABAR

Journal Article · Wed Feb 10 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3327745· OSTI ID:21371625

Lazzaro, A ^[1]

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1. Dipartimento di Fisica and INFN, Universita degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)

We present measurements of the CP-violation parameters S and C for the radiative decays B{sup 0}->pi{sup 0}K{sub S}{sup 0}gamma and B{sup 0}->etaK{sub S}{sup 0}gamma; for B->etaKgamma we also measure the branching fractions and for B{sup +}->etaK{sup +}gamma the time-integrated charge asymmetry A{sub ch}. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 467x10{sup 6} BB-bar pairs produced in e{sup +}e{sup -} annihilation at the PEP-II collider. For B{sup 0}->pi{sup 0}K{sub S}{sup 0}gamma we report results in two m(pi{sup 0}K{sub S}{sup 0}) mass regions: S{sub K*(892)g}amma -0.03+-0.29+-0.03, C{sub K*(892)g}amma = -0.14+-0.16+-0.03 for 0.8<m(pi{sup 0}K{sub S}{sup 0})<1.0 GeV/c{sup 2}; and S{sub pi{sup 0}}{sub K{sub S}{sup 0}}{sub gamma} -0.78+-0.59+-0.09, C{sub pi{sup 0}}{sub K{sub S}{sup 0}}{sub gamma} = -0.36+-0.33+-0.04 for 1.1<m(pi{sup 0}K{sub S}{sup 0})<1.8 GeV/c{sup 2}. For B->etaKgamma we find S{sub eta}{sub K{sub S}{sup 0}}{sub gamma} = -0.18{sub -0.46}{sup +0.49}+-0.12, C{sub eta}{sub K{sub S}{sup 0}}{sub gamma} = -0.32{sub -0.39}{sup +0.40}+-0.07, B(B{sup 0}->etaK{sup 0}gamma) = (7.1{sub -2.0}{sup +2.1}+-0.4)x10{sup -6}, B(B{sup +}->etaK{sup +}gamma) = (7.7+-1.0+-0.4)x10{sup -6}, and A{sub ch} (-9.0{sub -9.8}{sup +10.4}+-1.4)x10{sup -2}. The first error quoted is statistical and the second systematic.

• OSTI ID: 21371625
• Journal Information: AIP Conference Proceedings, Vol. 1200, Issue 1; Conference: SUSY09: 17. international conference on supersymmetry and the unification of fundamental interactions, Boston, MA (United States), 5-10 Jun 2009; Other Information: DOI: 10.1063/1.3327745; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ASYMMETRY
B NEUTRAL MESONS
BRANCHING RATIO
CP INVARIANCE
ETA MESONS
GEV RANGE
KAONS NEUTRAL SHORT-LIVED
KAONS PLUS
MULTIPARTICLE SPECTROMETERS
PAIR PRODUCTION
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
PIONS NEUTRAL
RADIATIVE DECAY
REST MASS
STANDARD MODEL
TIME DEPENDENCE
B MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GRAND UNIFIED THEORY
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
MASS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PIONS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY
SPECTROMETERS
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES
UNIFIED GAUGE MODELS