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Adriani, O.*; 谷田 聖; RHICf Collaboration*; 他17名*
Journal of Instrumentation (Internet), 16(10), p.P10027_1 - P10027_16, 2021/10
被引用回数:0 パーセンタイル:0(Instruments & Instrumentation)In the RHIC forward (RHICf) experiment, an operation with collisions was performed at 510 GeV from 24-27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetry measurements of very forward photons, s, and neutrons were satisfied. In this paper, we describe the details of these studies.
Kim, M. H.*; 谷田 聖; RHICf Collaboration*; 他23名*
Physical Review Letters, 124(25), p.252501_1 - 252501_6, 2020/06
被引用回数:5 パーセンタイル:45.83(Physics, Multidisciplinary)Transverse single-spin asymmetries of very forward neutral pions generated in polarized collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized + collisions at = 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction and transverse momentum have been observed at low transverse momentum GeV/ for the first time at this collision energy. The asymmetries show an approximate scaling in the region where non-perturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.