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足立 一郎*; 谷田 聖; Belle Collaboration*; 他406名*
Physical Review D, 98(11), p.112012_1 - 112012_29, 2018/11
被引用回数:12 パーセンタイル:64.07(Astronomy & Astrophysics)We report measurements of and from a time-dependent Dalitz plot analysis of with decays, where the light unflavored and neutral hadron is a , , or meson. The analysis is performed with a combination of the final data sets of the BABAR and Belle experiments containing and pairs collected at the resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure and . The result for the direct measurement of the angle is . The last quoted uncertainties are due to the composition of the decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics data sample as part of this analysis. We find the first evidence for at the level of standard deviations. The measurement excludes the trigonometric multifold solution at the level of standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of is ruled out at the level of standard deviations, and thus violation is observed in decays.
Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他406名*
Physical Review D, 93(1), p.011501_1 - 011501_8, 2016/01
被引用回数:35 パーセンタイル:83.85(Astronomy & Astrophysics)PHENIX measurements are presented for the cross section and double-helicity asymmetry () in inclusive production at midrapidity from collisions at GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The results follow an increasingly positive asymmetry trend with and with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on and jet ALL and suggested a positive contribution of gluon polarization to the spin of the proton for the gluon momentum fraction range . The data presented here extend to a currently unexplored region, down to , and thus provide additional constraints on the value of .