Journal article
Measurement of the CP-violation parameter sin 2φ1 with a new tagging method at the Y(5S) resonance
Y Sato, H Yamamoto, H Aihara, DM Asner, V Aulchenko, T Aushev, T Aziz, AM Bakich, V Bhardwaj, B Bhuyan, M Bischofberger, A Bondar, A Bozek, M Bračko, TE Browder, P Chang, P Chen, BG Cheon, K Chilikin, R Chistov Show all
Physical Review Letters | Published : 2012
Abstract
We report a measurement of the CP-violation parameter sin2φ1 at the Υ(5S) resonance using a new tagging method, called "B-π tagging." In Υ(5S) decays containing a neutral B meson, a charged B, and a charged pion, the neutral B is reconstructed in the J/ψKS0 CP-eigenstate decay channel. The initial flavor of the neutral B meson at the moment of the Υ(5S) decay is opposite to that of the charged B and may thus be inferred from the charge of the pion without reconstructing the charged B. From the asymmetry between B-π+ and B-π- tagged J/ψKS0 yields, we determine sin2φ1=0.57±0.58(stat) ±0.06(syst). The results are based on 121fb-1 of data recorded by the Belle detector at the KEKB e+e- collider...
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Awarded by National Science Foundation
Funding Acknowledgements
This work was supported in part by a JSPS Grant- in-Aid, No. 10J03308. We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group, NII, and PNNL/EMSL for valuable computing, and SINET4 for network support. We acknowledge support from MEXT, JSPS and Nagoya's TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); MSMT (Czechia); DST (India); INFN (Italy); MEST, NRF, GSDC of KISTI, and WCU (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE and NSF (U.S.).