Journal article
Energy Scan of the e e- →hb (nP)π π- (n=1, 2) Cross Sections and Evidence for Y(11020) Decays into Charged Bottomoniumlike States
R Mizuk, A Bondar, I Adachi, H Aihara, DM Asner, H Atmacan, V Aulchenko, T Aushev, R Ayad, I Badhrees, AM Bakich, E Barberio, P Behera, V Bhardwaj, B Bhuyan, J Biswal, A Bobrov, G Bonvicini, A Bozek, M Bračko Show all
Physical Review Letters | Published : 2016
Abstract
Using data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we measure the energy dependence of the e+e-→hb(nP)π+π- (n=1, 2) cross sections from thresholds up to 11.02 GeV. We find clear (10860) and (11020) peaks with little or no continuum contribution. We study the resonant substructure of the (11020)→hb(nP)π+π- transitions and find evidence that they proceed entirely via the intermediate isovector states Zb(10610) and Zb(10650). The relative fraction of these states is loosely constrained by the current data: The hypothesis that only Zb(10610) is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only Zb(10650) is produced..
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Awarded by RSF (Russia)
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 (Australia); FWF (Austria); NSFC and CCEPP (China); MSMT (Czechia); CZF, DFG, EXC153, and VS (Germany); DST (India); INFN (Italy); MOE, MSIP, NRF, BK21Plus, WCU, and RSRI (Korea); MNiSW and NCN (Poland); MES, RFAAE, and RSF under Grant No. 15-12-30014 (Russia); ARRS (Slovenia); IKERBASQUE and UPV/EHU (Spain); SNSF (Switzerland); MOE and MOST (Taiwan); and DOE and NSF (USA).