论文标题
$ \ sqrt {s _ {\ mathrm {nn}}}} = 8.16 $ \ sqrt {
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
论文作者
论文摘要
在$ \ sqrt {s _ {\ Mathrm {nn}}}} = 8.16 $ TEV和PB-PB碰撞$ \ sqrt {s _ {s _ {\ mathrm {nn}}} = 5.02 $ TEV的测量，以$ \ sqrt {s _ {\ mathrm {nn}}} = 8.16 $ \ sqrt {s _ {\ sqrm {nn}}} = 8.16 $ \ sqrt {s _ {\ mathrm {nn}} = 5.02 $ TEV的测量。它是通过检测具有伪the的MUON $ -4 <η_μ<-2.5 $和横向动量$ p _ {\ rm t}^μ> 20 $ gev/$ c $在实验室框架中执行的。对于不变质量质量$ 60 <m^{m^{μμgev$ c^2 $和速度$ 2.5 <y_ {cms}^{cms}^{μμμ} <4 $，不变的收益率和核修饰因子是对不变质量$ 60 <m^{m^{μμgev$ c^2 $和速度$ 60 <m^{μμgev$ c^2 $的$ 60 <m^{m^{gev $ c^2 $的测量。它们也是速度的函数，也是PB-PB碰撞的中心性的函数。将结果与理论计算进行比较，无论是有没有核修改Parton分布函数（PDFS）。在P-PB碰撞中，质量中心框架相对于实验室框架有所提高，并且测量值涵盖了（$ -4.46 <y_ {cms}^{μμμ} <-2.96 $）和前进（$ 2.03 <y__ {cms}^{cms}^{μμ®} <3.53 $）。对于P-PB的碰撞，结果在实验和理论不确定性中与包括自由核电和核修饰PDF的计算一致。对于PB-PB碰撞，基于自由核心PDF的数据和计算之间的综合收益率中可以看到$3.4σ$的偏差，而一旦考虑核修改，就发现了良好的一致性。
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.
