Transverse single-spin asymmetries of midrapidity π0 and η mesons in polarized p+p collisions at s=200 GeV

arXiv: High Energy Physics - Experiment Pub Date : 2020-11-28 DOI:10.1103/PHYSREVD.103.052009

U. Acharya, C. Aidala, Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun, V. Babintsev, N. Bandara, K. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, R. Belmont, A. Berdnikov, Y. Berdnikov, L. Bichon, B. Blankenship, D. Blau, J. Bok, V. Borisov, M. Brooks, J. Bryslawskyj, V. Bumazhnov, Sarah Campbell, V. Canoa Roman, R. Cervantes, C. Chi, M. Chiu, I. Choi, J. B. Choi, Z. Citron, M. Connors, R. Corliss, N. Cronin, M. Csanád, T. Csörgő, T. Danley, M. Daugherity, G. David, K. DeBlasio, K. Dehmelt, A. Denisov, A. Deshpande, E. Desmond, A. Dion, D. Dixit, J. Do, A. Drees, K. Drees, J. Durham, A. Durum, A. Enokizono, H. En’yo, R. Esha, S. Esumi, B. Fadem, W. Fan, N. Feege, D. Fields, M. Finger, D. Firak, D. Fitzgerald, S. Fokin, J. Frantz, A. Franz, A. Frawley, Y. Fukuda, C. Gal, P. Gallus, P. Garg, H. Ge, M. Giles, F. Giordano, Y. Goto, N. Grau, S. Greene, M. Grosse Perdekamp, T. Gunji, H. Guragain, T. Hachiya, J. Haggerty, K. Hahn, H. Hamagaki, H. Hamilton, S. Y. Han, J. Hanks, S. Hasegawa, T.

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引用次数: 10

Abstract

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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s= 200gev极化p+p碰撞中速π0和η介子的横向单自旋不对称性

我们在相对论重离子对撞机上用PHENIX探测器测量了在伪快度范围$|\eta|<0.35$和质心能量为200 GeV的$p^\uparrow$$+$$p$碰撞中$\pi^0$和$\eta$介子的横向单自旋不对称性。与先前在该运动区域的测量结果相比，这些结果的不确定性因子减少了3。作为强子，$\pi^0$和$\eta$介子对混合部分子口味的初始和终态非微扰效应都很敏感。比较它们的横向单自旋不对称性的差异有可能解开奇异性、同位旋或质量可能产生的影响。这些结果可以约束twist-3 trigluon共线相关函数和胶子Sivers函数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv: High Energy Physics - Experiment

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