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Nuclear Dependence of the Transverse-Single-Spin Asymmetry for Forward Neutron Production in Polarized p+A Collisions at sNN =200 GeV

Aidala, C.; Akiba, Y.; Alfred, M.; Andrieux, V.; Aoki, K.; Apadula, N.; Oskarsson, Anders LU ; Silvermyr, David LU and , (2018) In Physical Review Letters 120(2).
Abstract
During 2015, the Relativistic Heavy Ion Collider (RHIC) provided collisions of transversely polarized protons with Au and Al nuclei for the first time, enabling the exploration of transverse-single-spin asymmetries with heavy nuclei. Large single-spin asymmetries in very forward neutron production have been previously observed in transversely polarized p+p collisions at RHIC, and the existing theoretical framework that was successful in describing the single-spin asymmetry in p+p collisions predicts only a moderate atomic-mass-number (A) dependence. In contrast, the asymmetries observed at RHIC in p+A collisions showed a surprisingly strong A dependence in inclusive forward neutron production. The observed asymmetry in p+Al collisions is... (More)
During 2015, the Relativistic Heavy Ion Collider (RHIC) provided collisions of transversely polarized protons with Au and Al nuclei for the first time, enabling the exploration of transverse-single-spin asymmetries with heavy nuclei. Large single-spin asymmetries in very forward neutron production have been previously observed in transversely polarized p+p collisions at RHIC, and the existing theoretical framework that was successful in describing the single-spin asymmetry in p+p collisions predicts only a moderate atomic-mass-number (A) dependence. In contrast, the asymmetries observed at RHIC in p+A collisions showed a surprisingly strong A dependence in inclusive forward neutron production. The observed asymmetry in p+Al collisions is much smaller, while the asymmetry in p+Au collisions is a factor of 3 larger in absolute value and of opposite sign. The interplay of different neutron production mechanisms is discussed as a possible explanation of the observed A dependence. © 2018 authors. Published by the American Physical Society. (Less)
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Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
120
issue
2
publisher
American Physical Society
external identifiers
  • scopus:85040457713
ISSN
1079-7114
DOI
language
English
LU publication?
yes
id
3bc114de-4a14-4665-bf5d-ba9d4aa9700c
date added to LUP
2018-01-22 12:37:39
date last changed
2018-05-29 10:25:56
@article{3bc114de-4a14-4665-bf5d-ba9d4aa9700c,
  abstract     = {During 2015, the Relativistic Heavy Ion Collider (RHIC) provided collisions of transversely polarized protons with Au and Al nuclei for the first time, enabling the exploration of transverse-single-spin asymmetries with heavy nuclei. Large single-spin asymmetries in very forward neutron production have been previously observed in transversely polarized p+p collisions at RHIC, and the existing theoretical framework that was successful in describing the single-spin asymmetry in p+p collisions predicts only a moderate atomic-mass-number (A) dependence. In contrast, the asymmetries observed at RHIC in p+A collisions showed a surprisingly strong A dependence in inclusive forward neutron production. The observed asymmetry in p+Al collisions is much smaller, while the asymmetry in p+Au collisions is a factor of 3 larger in absolute value and of opposite sign. The interplay of different neutron production mechanisms is discussed as a possible explanation of the observed A dependence. © 2018 authors. Published by the American Physical Society.},
  articleno    = {022001},
  author       = {Aidala, C. and Akiba, Y. and Alfred, M. and Andrieux, V. and Aoki, K. and Apadula, N. and Oskarsson, Anders and Silvermyr, David and , },
  issn         = {1079-7114},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Nuclear Dependence of the Transverse-Single-Spin Asymmetry for Forward Neutron Production in Polarized p+A Collisions at sNN =200 GeV},
  url          = {http://dx.doi.org/},
  volume       = {120},
  year         = {2018},
}