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新山 雅之*; 谷田 聖; Belle Collaboration*; 他167名*
Physical Review D, 97(7), p.072005_1 - 072005_21, 2018/04
被引用回数:19 パーセンタイル:68.82(Astronomy & Astrophysics)We measure the inclusive production cross sections of hyperons and charmed baryons from annihilation using a 800 fb data sample taken near the resonance with the Belle detector at the KEKB asymmetric-energy collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. The production cross sections divided by the number of spin states for hyperons follow an exponential function with a single slope parameter except for the resonance. Suppression for and hyperons is observed. Among the production cross sections of charmed baryons, a factor of three difference for states over states is observed. This observation suggests a diquark structure for these baryons.
Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他167名*
Physical Review D, 95(11), p.112003_1 - 112003_17, 2017/06
被引用回数:49 パーセンタイル:89.48(Astronomy & Astrophysics)We perform a full amplitude analysis of the process , where refers to either or . A new charmonium-like state that decays to is observed with a significance of . Its mass is MeV/ and width is MeV. The hypothesis is favored over the hypothesis at the level of . The analysis is based on the 980 fb data sample collected by the Belle detector at the asymmetric-energy collider KEKB.