Transverse Single-Spin Asymmetry for Very Forward Neutral Pion Production in Polarized p plus p Collisions at root s=510 GeV
- Authors
- Kim, M. H.; Adriani, O.; Berti, E.; Bonechi, L.; D'Alessandro, R.; Goto, Y.; Hong, B.; Itow, Y.; Kasahara, K.; Lee, J. H.; Ljubicic, T.; Makino, Y.; Menjo, H.; Nakagawa, I; Ogawa, A.; Park, J. S.; Sako, T.; Sakurai, N.; Sato, K.; Seidl, R.; Tanida, K.; Torii, S.; Tricomi, A.; Ueno, M.; Zhou, Q. D.
- Issue Date
- 22-Jun-2020
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.124, no.25
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 124
- Number
- 25
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54979
- DOI
- 10.1103/PhysRevLett.124.252501
- ISSN
- 0031-9007
- Abstract
- Transverse single-spin asymmetries of very forward neutral pions generated in polarized p + p collisions allow us to understand the production mechanism in terms of perturbative and nonperturbative 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 p + p collisions at root s = 510 GeV. The large nonzero asymmetries increasing both in longitudinal momentum fraction x(F) and transverse momentum p(T) have been observed at low transverse momentum p(T) < 1 GeV/c for the first time, at this collision energy. The asymmetries show an approximate x(F), scaling in the p(T) region where nonperturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.
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