Journal article
Observation of two charged bottomoniumlike resonances in Y(5S) decays
A Bondar, A Garmash, R Mizuk, D Santel, K Kinoshita, I Adachi, H Aihara, K Arinstein, DM Asner, T Aushev, T Aziz, AM Bakich, E Barberio, K Belous, V Bhardwaj, M Bischofberger, A Bozek, M Bračko, TE Browder, MC Chang Show all
Physical Review Letters | Published : 2012
Abstract
We report the observation of two narrow structures in the mass spectra of the π ±Υ(nS) (n=1, 2, 3) and π ±h b(mP) (m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M 1=(10607.2±2.0)MeV/c2, Γ 1=(18.4±2.4) MeV, and M 2=(10652.2±1.5)MeV/c2, Γ 2=(11. 5±2.2)MeV. The results are obtained with a 121.4fb -1 data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e +e - collider. © 2012 American Physical Society.
Grants
Awarded by Grants-in-Aid for Scientific Research
Funding Acknowledgements
We are grateful to Alexander Milstein of BINP and Mikhail Voloshin of University of Minnesota for fruitful 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 and the NII 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); MEST, NRF, NSDC of KISTI, and WCU (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE and NSF (USA).