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research article
Measurement of the Direct CP Asymmetry in over-bar & RARR; gamma; Decays with a Lepton Tag
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.
Type
research article
Web of Science ID
WOS:000352990500004
Authors
Pesantez, L.
•
Urquijo, P.
•
Dingfelder, J.
•
Abdesselam, A.
•
Adachi, I.
•
Adamczyk, K.
•
Aihara, H.
•
Al Said, S.
•
Arinstein, K.
•
Asner, D. M.
Corporate authors
Belle Collaboration
Publication date
2015
Publisher
Published in
Volume
114
Issue
15
Article Number
151601
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
May 29, 2015
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