Polarization and cross section of midrapidity J/ψ production in p+p collisions at s=510 GeV

arXiv: High Energy Physics - Experiment Pub Date : 2020-05-28 DOI:10.1103/PHYSREVD.102.072008

U. Acharya, A. Adare, C. Aidala, N. Ajitanand, Y. Akiba, R. Akimoto, M. Alfred, N. Apadula, Y. Aramaki, H. Asano, E. Atomssa, T. Awes, B. Azmoun, V. Babintsev, M. Bai, N. Bandara, B. Bannier, K. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, S. Beckman, R. Belmont, A. Berdnikov, Y. Berdnikov, L. Bichon, D. Black, B. Blankenship, J. Bok, V. Borisov, K. Boyle, M. Brooks, J. Bryslawskyj, H. Buesching, V. Bumazhnov, S. Campbell, V. Canoa Roman, C. Chen, C. Chi, M. Chiu, I. Choi, J. B. Choi, T. Chujo, Z. Citron, M. Connors, M. Csanád, T. Csörgő, A. Datta, M. Daugherity, G. David, K. DeBlasio, K. Dehmelt, A. Denisov, A. Deshpande, E. Desmond, L. Ding, A. Dion, 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, C. Gal, P. Gallus, P. Garg, H. Ge, F. Giordano, A. Glenn, Y. Goto, N. Grau, S. Greene, M. Grosse Perdekamp, Y. Gu, T. Gunji, H. Guragain, T. Hachiya,

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引用次数: 1

Abstract

The PHENIX experiment has measured the spin alignment for inclusive $J/\psi\rightarrow e^{+}e^{-}$ decays in $p$+$p$ collisions at $\sqrt{s}=510$ GeV at midrapidity. The angular distributions have been measured in three different polarization frames, and the three decay angular coefficients have been extracted in a full two-dimensional analysis. Previously, PHENIX saw large longitudinal net polarization at forward rapidity at the same collision energy. This analysis at midrapidity, complementary to the previous PHENIX results, sees no sizable polarization in the measured transverse momentum range of $0.0

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s=510 GeV时p+p碰撞中速J/ψ产生的偏振和截面

PHENIX实验测量了$\sqrt{s}=510$ GeV中速下$p$ + $p$碰撞中包含$J/\psi\rightarrow e^{+}e^{-}$衰变的自旋排列。测量了三种不同偏振框架下的角分布，并在二维分析中提取了三个衰减角系数。先前，在相同的碰撞能量下，PHENIX看到了大的纵向净极化。在中速下的分析，与先前的PHENIX结果相补充，发现在测量的$0.0

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arXiv: High Energy Physics - Experiment

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