摘要： We report the measurement of the direct CP asymmetry in the radiative B super(-) arrow right Xs+d gamma decay using a data sample of (772+ or -11)x106 BB super(-) pairs collected at the gamma (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The CP asymmetry is measured as a function of the photon energy threshold. For E gamma *> or =2.1 GeV, where E gamma * is the photon energy in the center-of-mass frame, we obtain ACP(B super(-) arrow right Xs+d gamma )=(2.2+ or -3.9+ or -0.9)%, consistent with the standard model prediction. 出版日期： 2015-04-17 出處： Physical review letters, 2015-04, Vol.114 (15) 資源來源： American Physical Society Journals 識別號： ISSN: 0031-9007 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.114.151601
