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Transverse single-spin asymmetries of midrapidity $$pi^0$$ and $$eta$$ mesons in polarized $$p$$$$+$$$$p$$ collisions at $$sqrt{s}=200$$ GeV

$$sqrt{s}=200$$GeVでの偏極陽子-陽子衝突における$$pi^0$$および$$eta$$中間子のシングルスピン非対称性

Acharya, U. A.*; 長谷川 勝一   ; 今井 憲一*; 佐甲 博之   ; 佐藤 進  ; 谷田 聖   ; PHENIX Collaboration*; 他309名*

Acharya, U. A.*; Hasegawa, Shoichi; Imai, Kenichi*; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 309 of others*

We present a measurement of the transverse single-spin asymmetry for $$pi^0$$ and $$eta$$ mesons in $$p^uparrow$$$$+$$$$p$$ collisions in the pseudorapidity range $$|eta|< 0.35$$ and at a center-of-mass energy of 200 GeV with the PHENIX detector at the Relativistic Heavy Ion Collider. In comparison with previous measurements in this kinematic region, these results have a factor of 3 smaller uncertainties. As hadrons, $$pi^0$$ and $$eta$$ mesons are sensitive to both initial- and final-state nonperturbative effects for a mix of parton flavors. Comparisons of the differences in their transverse single-spin asymmetries have the potential to disentangle the possible effects of strangeness, isospin, or mass. These results can constrain the twist-3 trigluon collinear correlation function as well as the gluon Sivers function.

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パーセンタイル:35.99

分野:Astronomy & Astrophysics

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