Measurement of the Direct CP Asymmetry in over-bar & RARR; gamma; Decays with a Lepton Tag

Title
Measurement of the Direct CP Asymmetry in over-bar & RARR; gamma; Decays with a Lepton Tag
Authors
천병구
Issue Date
2015-04
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 114, NO 15, Page. 151601-151602
Abstract
We report the measurement of the direct CP asymmetry in the radiative (B) over bar -˃ Xs+d gamma decay using a data sample of (772 +/- 11) x 10(6) B (B) over bar pairs collected at the Upsilon(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* ˃= 2.1 GeV, where E-gamma* is the photon energy in the center-of-mass frame, we obtain A(CP) ((B) over bar -˃ Xs+d gamma) = (2.2 +/- 3.9 +/- 0.9)%, consistent with the standard model prediction.
URI
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.151601http://hdl.handle.net/20.500.11754/23859
ISSN
0031-9007; 1079-7114
DOI
http://dx.doi.org/10.1103/PhysRevLett.114.151601
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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