Production of bb¯ at forward rapidity in p+p collisions at s=510 GeV

arXiv: High Energy Physics - Experiment Pub Date : 2020-05-28 DOI:10.1103/PHYSREVD.102.092002

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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Abstract

The cross section of bottom quark-antiquark ($b\bar{b}$) production in $p$+$p$ collisions at $\sqrt{s}=510$ GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider. The results are based on the yield of high mass, like-sign muon pairs measured within the PHENIX muon arm acceptance ($1.2 1$ GeV/$c$, and dimuon mass of 5--10 GeV/$c^2$. The extrapolated total cross section at this energy for $b\bar{b}$ production is $13.1 \pm 0.6~(\mbox{stat}) \pm 1.5~(\mbox{syst}) \pm 2.7~(\mbox{global})~\mu$b. The total cross section is compared to a perturbative quantum chromodynamics calculation and is consistent within uncertainties. The azimuthal opening angle between muon pairs from $b\bar{b}$ decays and their $p_T$ distributions are compared to distributions generated using {\sc ps pythia 6}, which includes next-to-leading order processes. The azimuthal correlations and pair $p_T$ distribution are not very well described by {\sc pythia} calculations, but are still consistent within uncertainties. Flavor creation and flavor excitation subprocesses are favored over gluon splitting.

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在s=510 GeV的p+p碰撞中向前快速bb¯的产生

在相对论重离子对撞机上用PHENIX探测器测量了$\sqrt{s}=510$ GeV下$p$ + $p$碰撞中底夸克-反夸克($b\bar{b}$)产生的横截面。该结果是基于在PHENIX μ子臂接收范围内测量的高质量，类符号μ子对的产量($1.2 1$ GeV/ $c$)和5- 10 GeV/ $c^2$的介子质量。在此能量下$b\bar{b}$生产的外推总横截面为$13.1 \pm 0.6~(\mbox{stat}) \pm 1.5~(\mbox{syst}) \pm 2.7~(\mbox{global})~\mu$ b。总横截面与微扰量子色动力学计算相比较，在不确定度内是一致的。将来自$b\bar{b}$衰变的介子对之间的方位角及其$p_T$分布与使用{\scps pythia 6}生成的分布进行了比较，其中包括次领先阶过程。方位角相关性和对$p_T$分布并没有很好地描述，但在不确定度内仍然是一致的。风味产生和风味激发子过程优于胶子分裂。{\sc}

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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