Journal article
Search for an H-Dibaryon with a Mass near 2mΛ in Υ(1S) and Υ(2S) Decays
BH Kim, SL Olsen, I Adachi, H Aihara, DM Asner, V Aulchenko, A Bay, K Belous, B Bhuyan, G Bonvicini, A Bozek, M Bračko, TE Browder, V Chekelian, A Chen, BG Cheon, K Chilikin, R Chistov, IS Cho, K Cho Show all
Physical Review Letters | Published : 2013
Abstract
We report the results of a high-statistics search for H dibaryon production in inclusive Υ(1S) and Υ(2S) decays. No indication of an H dibaryon with a mass near the MH=2mΛ threshold is seen in either the H→Λpπ- or ΛΛ decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive Υ(1S) and Υ(2S) decays to antideuterons. Since Υ(1S,2S) decays produce flavor-SU(3)-symmetric final states, these results put stringent constraints on H dibaryon properties. The results are based on analyses of 102 million Υ(1S) and 158 million Υ(2S) events collected with the Belle detector at the KE..
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Awarded by Japan Society for the Promotion of Science
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). B.-H. Kim and S.L. Olsen acknowledge support from NRF (Korea) Grant No. 20110029457 and WCU Grant No. R32-10155.