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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 (CROSBI ID 252971)

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(PHENIX Collaboration) Aidala, C. ; ... ; Dumancic, Mirta ; ... ; Makek, Mihael ; ... ; Vukman, Nikola ; ... ; Zou, L. Nuclear Dependence of the Transverse-Single-Spin Asymmetry for Forward Neutron Production in Polarized p+A Collisions at sNN=200 GeV // Physical review letters, 120 (2018), 2; 022001, 9. doi: 10.1103/physrevlett.120.022001

Podaci o odgovornosti

Aidala, C. ; ... ; Dumancic, Mirta ; ... ; Makek, Mihael ; ... ; Vukman, Nikola ; ... ; Zou, L.

PHENIX Collaboration

engleski

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

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.

Transverse Spin Asymmetry, Neutron, p+A, 200 GeV, PHENIX, RHIC

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Podaci o izdanju

120 (2)

2018.

022001

9

objavljeno

0031-9007

1079-7114

10.1103/physrevlett.120.022001

Povezanost rada

Fizika

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