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Nuclear Dependence of the Transverse Single-Spin Asymmetry in the Production of Charged Hadrons at Forward Rapidity in Polarized p+p, p+Al, and p+Au Collisions at sqrt(s)_NN=200  GeV (CROSBI ID 287482)

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(PHENIX Collaboration) Aidala, C. ; ... ; Makek, Mihael ; ... ; Vukman, Nikola ; ... ; Zou, L. Nuclear Dependence of the Transverse Single-Spin Asymmetry in the Production of Charged Hadrons at Forward Rapidity in Polarized p+p, p+Al, and p+Au Collisions at sqrt(s)_NN=200  GeV // Physical review letters, 123 (2019), 12; 12201, 9. doi: 10.1103/physrevlett.123.122001

Podaci o odgovornosti

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

PHENIX Collaboration

engleski

Nuclear Dependence of the Transverse Single-Spin Asymmetry in the Production of Charged Hadrons at Forward Rapidity in Polarized p+p, p+Al, and p+Au Collisions at sqrt(s)_NN=200  GeV

We report on the nuclear dependence of transverse single-spin asymmetries (TSSAs) in the production of positively-charged hadrons in polarized p↑+p, p↑+Al and p↑+Au collisions at sNN−−−√=200 GeV. The measurements have been performed at forward rapidity (1.4<η<2.4) over the range of 1.8<pT<7.0 GeV/c and 0.1<xF<0.2. We observed a positive asymmetry AN for positively-charged hadrons in \polpp collisions, and a significantly reduced asymmetry in p↑+A collisions. These results reveal a nuclear dependence of charged hadron AN in a regime where perturbative techniques are relevant. These results provide new opportunities to use \polpA collisions as a tool to investigate the rich phenomena behind TSSAs in hadronic collisions and to use TSSA as a new handle in studying small-system collisions.

Transverse Spin Asymmetry, Forward rapidity, Hadrons, p+A, p+Al, p+Au, 200 GeV, PHENIX, RHIC

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Podaci o izdanju

123 (12)

2019.

12201

9

objavljeno

0031-9007

10.1103/physrevlett.123.122001

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Fizika

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