Journal article
Evidence for the ηb(2S) and observation of h b(1P)→ηb(1S)γ and hb(2P) →ηb(1S)γ
R Mizuk, DM Asner, A Bondar, TK Pedlar, I Adachi, H Aihara, K Arinstein, V Aulchenko, T Aushev, T Aziz, AM Bakich, A Bay, K Belous, V Bhardwaj, B Bhuyan, M Bischofberger, G Bonvicini, A Bozek, M Bračko, J Brodzicka Show all
Physical Review Letters | Published : 2012
Abstract
We report the first evidence for the ηb(2S) using the h b(2P)→ηb(2S)γ transition and the first observation of the hb(1P)→ηb(1S)γ and hb(2P)→ηb(1S)γ transitions. The mass and width of the ηb(1S) and ηb(2S) are measured to be mηb (1S)=(9402.4±1.5±1.8) MeV/c2, m ηb (2S)=(9999.0±3.5-1.9+2.8) MeV/c2, and Γηb (1S)=(10.8-3.7-2.0+4.0+4.5) MeV. We also update the hb(1P) and hb(2P) mass measurements. We use a 133.4 fb-1 data sample collected at energies near the γ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e - collider. © 2012 American Physical Society.
Grants
Awarded by National Science Foundation
Funding Acknowledgements
We are grateful to A. M. Badalian, Yu. S. Kalashnikova, and M. B. Voloshin for useful discussions. 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).