arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2112.09433nucl-exhep-ex
收藏

在$\sqrt{s} =$ 5.02和13 TeV pp碰撞中作为带电粒子多重数函数的前向快度J/ $ψ$产生

Forward rapidity J/$ψ$ production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s} =$ 5.02 and 13 TeV

ALICE Collaboration

备注：
27 pages, 8 captioned figures, 5 tables, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/7626
发表信息：
JHEP 06 (2022) 015
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

J/ $ψ$的生产作为一个功能的质子$-$质子（PP）碰撞在质心能量$\sqrt{s} =$ 5.02和13 TeV的前向快度的带电粒子多重性测量。J/ $ψ$介子在快度区间（2.5 $< y <$ 4.0）通过衰变为双μ子重建，而带电粒子多重数密度（${\rm d}N_{\rm{ch}}/{\rm d}η$）在中快度$(|η| < 1)$测量。作为多重性的函数的生产率报告为给定多重性区间中的产率与多重性积分的产率的比率。这一观察结果表明，在两个碰撞能量下，带电粒子多重性线性增加，归一化为非弹性事件（${{\rm d}N_{\rm ch}/{\rm d}η}/{\langle {\rm d}N_{\rm ch}/{\rm d}η\rangle}$）的相应平均值。测量结果进行了比较，与现有的ALICE结果在midrapidity和理论模型计算。第一次测量的平均横向动量（$\langle p_{\mathrm{T}}\rangle$）的J/ $ψ$在pp碰撞表现出增加的趋势作为${{\rm d}N_{\rm ch}/{\rm d}η}/{\langle {\rm d}N_{\rm ch}/{\rm d}η\rangle}$的函数，显示出饱和向高带电粒子多重性。

英文摘要：

The production of J/$ψ$ is measured as a function of charged-particle multiplicity at forward rapidity in proton$-$proton (pp) collisions at center-of-mass energies $\sqrt{s} =$ 5.02 and 13 TeV. The J/$ψ$ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 $< y <$ 4.0), whereas the charged-particle multiplicity density (${\rm d}N_{\rm{ch}}/{\rm d}η$) is measured at midrapidity $(|η| < 1)$. The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (${{\rm d}N_{\rm ch}/{\rm d}η}/{\langle {\rm d}N_{\rm ch}/{\rm d}η\rangle}$), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum ($\langle p_{\mathrm{T}}\rangle$) of J/$ψ$ in pp collisions exhibits an increasing trend as a function of ${{\rm d}N_{\rm ch}/{\rm d}η}/{\langle {\rm d}N_{\rm ch}/{\rm d}η\rangle}$ showing a saturation towards high charged-particle multiplicities.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑