Measurement of inclusive J/ψ polarization in p+p collisions at s=200  GeV by the STAR experiment

S. Adam, L. Adamczyk, J. Adams, J. K. Adkins, G. Agakishiev, M. Aggarwal, Z. Ahammed, I. Alekseev, D. Anderson, A. Aparin, E. Aschenauer, M. U. Ashraf, F. Atetalla, A. Attri, G. S. Averichev, V. Bairathi, K. Barish, A. Behera, R. Bellwied, A. Bhasin, J. Bielcik, J. Bielčíková, L. Bland, I. Bordyuzhin, J. Brandenburg, A. Brandin, J. Butterworth, H. Caines, M. S'anchez, D. Cebra, I. Chakaberia, P. Chaloupka, B. Chan, F. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, D. Chen, J. Chen, X. Chen, Z. Chen, J. Cheng, M. Cherney, M. Chevalier, S. Choudhury, W. Christie, X. Chu, H. Crawford, M. Csan'ad, M. Daugherity, T. Dedovich, I. Deppner, A. Derevschikov, L. Didenko, X. Dong, J. Drachenberg, J. Dunlop, T. Edmonds, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, A. Ewigleben, O. Eyser, R. Fatémi, S. Fazio, P. Federic, J. Fedorišin, C. Feng, Y. Feng, P. Filip, E. Finch, Y. Fisyak, A. Francisco, L. Fulek, C. Gagliardi, T. Galatyuk, F. Geurts, A. Gibson, K. Gopal, D. Grosnick, W. Guryn, A
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引用次数: 6

Abstract

We report on new measurements of inclusive J/$\psi$ polarization at mid-rapidity in p+p collisions at $\sqrt{s}$ = 200 GeV by the STAR experiment at RHIC. The polarization parameters, $\lambda_\theta$, $\lambda_\phi$, and $\lambda_{\theta\phi}$, are measured as a function of transverse momentum ($p_T$) in both the Helicity and Collins-Soper (CS) reference frames within $p_T< 10$ GeV/$C$. Except for $\lambda_\theta$ in the CS frame at the highest measured $p_T$, all three polarization parameters are consistent with 0 in both reference frames without any strong $p_T$ dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with non-relativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.
用STAR实验测量s= 200gev p+p碰撞中包含J/ψ的极化
我们报告了在RHIC的STAR实验中,在$\sqrt{s}$ = 200 GeV的p+p碰撞中,在中速下包含J/ $\psi$极化的新测量结果。在$p_T< 10$ GeV/ $C$的Helicity和Collins-Soper (CS)参考系中,偏振参数$\lambda_\theta$、$\lambda_\phi$和$\lambda_{\theta\phi}$作为横向动量($p_T$)的函数进行了测量。除了在测得最高的CS框架$p_T$中$\lambda_\theta$外,三个偏振参数在两个参考框架中都与0一致,没有强烈的$p_T$依赖性。将几种模型计算结果与实验数据进行了比较,发现使用彩色玻璃凝聚有效场论与非相对论性QCD相结合的模型对实验结果给出了最好的总体描述,尽管由于实验的不确定性不能排除其他模型的存在。
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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