Measurement of the Direct CP Asymmetry in b -> s gamma Decays

Abstract

We describe a measurement of the direct CP asymmetry between inclusive b -> s gamma and bbar -> sbar gamma decays. This asymmetry is expected to be less than 0.01 in the Standard Model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89 million BB pairs recorded with the BaBar detector at PEP-II, from which we reconstruct a set of 12 exclusive b -> s gamma final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of A_CP(b -> s gamma) = 0.025 +/- 0.050(stat.) +/- 0.015(syst.), corresponding to an allowed range of -0.06 < A_CP(b -> s gamma) < +0.11 at 90% confidence level.

arXiv comment7 pages, 2 postscript figures, submitted to Physical Review Letters

References in corpus (10)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The BABAR Detector
• Quark mass effects in B -> Xs gamma
• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics
• Searching for supersymmetry in rare B decays
• Present Status of Inclusive Rare B Decays
• Completing the NLO QCD calculation of B -> Xs gamma
• Bounds on the CP Asymmetry in $b\to s\gamma$ Decays
• Search for the Radiative Decays B -> rho gamma and B0 -> omega gamma

Cited by in corpus (20)

• B, D and K decays
• Measurements of the B -> X_s gamma Branching Fraction and Photon Spectrum from a Sum of Exclusive Final States
• Measurement of the B --> X_s gamma Branching Fraction and Photon Energy Spectrum using the Recoil Method
• New Physics at a Super Flavor Factory
• Measurement of the Branching Fraction and Photon Energy Moments of B->X_s gamma and A_{cp}(B->X_(s+d) gamma)
• NNLL QCD Contribution of the Electromagnetic Dipole Operator to Gamma(anti-B -> X(s) gamma)
• Measurement of B(B-->X_s γ), the B-->X_s γ photon energy spectrum, and the direct CP asymmetry in B-->X_{s+d} γ decays
• Comparative Study of CP Asymmetries in Supersymmetric Models
• Invariant approach to flavour-dependent CP-violating phases in the MSSM
• Null tests of the Standard Model at an International Super $B$ Factory
• The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model
• Large Phase of B_s-\bar B_s Mixing in Supersymmetric Grand Unified Theories
• A Measurement of CP Asymmetry in b->sgamma using a Sum of Exclusive Final States
• Solving the SUSY CP problem with flavor breaking F-terms
• CP Asymmetry in ${\bar{B}}^0\to K^{-}{\pi }^{+}$ from SUSY Flavor Changing Interactions
• CP violation in beauty decays
• Novel two-loop SUSY effects on CP asymmetry in $B\to \varphi K_s$
• Searching for New Physics by means of Relative Phases and Moduli of Decay Amplitudes
• B-meson signatures of a Supersymmetric U(2) flavor model
• Electro-Weak Penguin and Leptonic Decays in BaBar