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足立 一郎*; 谷田 聖; Belle Collaboration*; 他421名*
Physical Review Letters, 121(26), p.261801_1 - 261801_11, 2018/12
被引用回数:9 パーセンタイル:57.38(Physics, Multidisciplinary)We present first evidence that the cosine of the -violating weak phase is positive, and hence exclude trigonometric multifold solutions of the CKM Unitarity Triangle using a time-dependent Dalitz plot analysis of with decays, where denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BaBar and Belle experiments collected at the resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain pairs recorded by the BaBar detector and pairs recorded by the Belle detector. The results of the measurement are and . The result for the direct measurement of the angle of the CKM Unitarity Triangle is . The quoted model uncertainties are due to the composition of the decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics data sample. CP violation is observed in decays at the level of standard deviations. The significance for is standard deviations. The trigonometric multifold solution is excluded at the level of standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.
Adare, A.*; 今井 憲一; 谷田 聖; PHENIX Collaboration*; 他421名*
Physical Review Letters, 114(19), p.192301_1 - 192301_8, 2015/05
被引用回数:133 パーセンタイル:97.3(Physics, Multidisciplinary)We present azimuthal angular correlations between charged hadrons and energy deposited in calorimeter towers in central + Au and minimum bias collisions at GeV. The charged hadron is measured at midrapidity , and the energy is measured at large rapidity (, Au-going direction). An enhanced near-side angular correlation across is observed in +Au collisions. Using the event plane method applied to the Au-going energy distribution, we extract the anisotropy strength for inclusive charged hadrons at midrapidity up to . We also present the measurement of for identified and and (anti)protons in central + Au collisions, and observe a mass-ordering pattern similar to that seen in heavy-ion collisions. These results are compared with viscous hydrodynamic calculations and measurements from + Pb at = 5.02 TeV. The magnitude of the mass ordering in +Au is found to be smaller than that in +Pb collisions, which may indicate smaller radial flow in lower energy +Au collisions.