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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.11126nucl-exhep-ex
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$\sqrt{s_{\mathrm{NN}}}=8.16$ TeV的p-Pb碰撞和$\sqrt{s_{\mathrm{NN}}}=5.02$ TeV的Pb-Pb碰撞中Z玻色子的产生

Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

ALICE Collaboration

摘要:

报道了$\sqrt{s_{\mathrm{NN}}}=8.16$ TeV的p-Pb碰撞和$\sqrt{s_{\mathrm{NN}}}=5.02$ TeV的Pb-Pb碰撞中Z玻色子产生的测量结果。它是在双μ子衰变通道中进行的,通过在实验室框架中探测具有赝快度$-4 < η_μ < -2.5$和横动量$p_{\rm T}^μ > 20$ GeV/ $c$的μ子。测量了具有不变质量$60 < m^{μμ} < 120$ GeV、$c^2$和快度$2.5 < y_{cms}^{μμ} < 4$的反号双μ子的不变产额和核修饰因子。它们是作为一个函数的快速性,铅铅碰撞,以及中心。的结果进行了比较与理论计算,核修改和不修改的部分子分布函数(PDF)。在p-Pb碰撞中,质心系相对于实验室系被提升,测量覆盖了后向($-4.46< y_{cms}^{μμ}<-2.96$)和前向($2.03< y_{cms}^{μμ}<3.53$)快度区。对于p-Pb碰撞,结果是一致的实验和理论的不确定性与计算,包括自由核子和核修改的PDF。对于铅铅碰撞,$3.4σ$偏差被认为是在集成的数据和计算的基础上的自由核子PDF之间的产量,而良好的协议被发现,一旦核修改被认为是。

英文摘要:

Measurement of Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity $-4 < η_μ < -2.5$ and transverse momentum $p_{\rm T}^μ > 20$ GeV/$c$ in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass $60 < m^{μμ} < 120$ GeV$c^2$ and rapidity $2.5 < y_{cms}^{μμ} < 4$. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward ($-4.46< y_{cms}^{μμ}<-2.96$) and forward ($2.03< y_{cms}^{μμ}<3.53$) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a $3.4σ$ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.

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