Journal article
Search for time-dependent CPT violation in hadronic and semileptonic B decays
T Higuchi, K Sumisawa, I Adachi, H Aihara, DM Asner, V Aulchenko, T Aushev, AM Bakich, A Bay, K Belous, V Bhardwaj, B Bhuyan, M Bischofberger, A Bondar, A Bozek, M Bračko, O Brovchenko, TE Browder, MC Chang, P Chang Show all
Physical Review D Particles Fields Gravitation and Cosmology | Published : 2012
Abstract
We report a new sensitive search for CPT violation, which includes improved measurements of the CPT-violating parameter z and the total decay-width difference normalized to the averaged width ΔΓ d/ Γ d of the two B d mass eigenstates. The results are based on a data sample of 535×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We obtain Re(z)=[+1.9±3.7(stat) ±3.3(syst)]×10 -2, Im(z)=[-5.7±3.3(stat)±3. 3(syst)]×10 -3, and ΔΓ d/Γ d=[-1.7±1.8(stat)±1.1(syst)]×10 -2, all of which are consistent with zero. This is the most precise single measurement of these parameters in the neutral B-meson system to date. © 2012 American Phys..
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Funding Acknowledgements
We thank the KEKB group for excellent operation of the accelerator; the KEK cryogenics group for efficient solenoid operations; and the KEK computer group, the NII, and PNNL/EMSL for valuable computing and SINET4 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 (USA).