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Abudinn, F.*; 谷田 聖; Belle II Collaboration*; 他420名*
Chinese Physics C, 44(2), p.021001_1 - 021001_12, 2020/02
被引用回数:23 パーセンタイル:93.93(Physics, Nuclear)From April to July 2018, a data sample at the peak energy of the resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be () pb, where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II.
Adare, A.*; 今井 憲一; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他420名*
Physical Review C, 92(3), p.034913_1 - 034913_20, 2015/09
被引用回数:20 パーセンタイル:78.02(Physics, Nuclear)We have studied the dependence of azimuthal anisotropy for inclusive and identified charged hadrons in Au + Au and Cu + Cu collisions on collision energy, species, and centrality. The values of as a function of transverse momentum and centrality in Au+Au collisions at = 200 and 62.4 GeV are the same within uncertainties. However, in Cu + Cu collisions we observe a decrease in values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au + Au and Cu + Cu collisions we find that depends both on eccentricity and the number of participants, . We observe that divided by eccentricity () monotonically increases with and scales as . The Cu + Cu data at 62.4 GeV falls below the other scaled data. For identified hadrons, divided by the number of constituent quarks is independent of hadron species as a function of transverse kinetic energy between GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu + Cu data at 62.4 GeV, of vs for all measured particles.