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0 and resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle ambiguity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.
GeVAdare, 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.
