论文标题
$ \ sqrt {s _ {\ rm nn}} $ = 5.02 TEV的pp和pb-pb碰撞中的美容 - 哈德隆衰减的电子测量
Measurement of electrons from beauty-hadron decays in pp and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
论文作者
论文摘要
在质子 - 蛋白质（PP）和中央PB-PB碰撞中，使用Alice检测器，使用Alice检测器，使用Alice检测器。在横向碰撞中测量的横截面以横向动量间隔$ 2 <p _ {\ rm t} <8 $ gev/$ c $与基于扰动量子染色体动力学计算的模型进行了比较。在10％最中心的PB-PB碰撞中的产量，以$ 2 <p _ {\ rm t} <26 $ gev/$ c $来衡量，用于计算核修饰因子$ r _ {\ rm aa} $，将PP参考截面分解为$ p _ {\ rm t} $ $ $ $ $ $ $ c。测得的$ r _ {\ rm aa} $在高$ p _ {\ rm t} $上表现出对美容 - 哈德隆衰减的电子产量的重大抑制，并且对$ p _ {\ rm t} $ co $的$ p _ {\ rm t} $ co $的$ p _ {\ rm t} $没有显着依赖。基于重型夸克与夸克 - 胶状等离子体的相互作用的不同实现的几种理论模型描述了结果，与光和魅力夸克相比，美容夸克的能量损失较小。
The production of electrons from beauty-hadron decays was measured at midrapidity in proton-proton (pp) and central Pb-Pb collisions at center-of-mass energy per nucleon-nucleon pair $\sqrt{s_{\rm NN}}$ = 5.02 TeV, using the ALICE detector at the LHC. The cross section measured in pp collisions in the transverse momentum interval $2 < p_{\rm T} < 8$ GeV/$c$ was compared with models based on perturbative quantum chromodynamics calculations. The yield in the 10% most central Pb-Pb collisions, measured in the interval $2 < p_{\rm T} < 26$ GeV/$c$, was used to compute the nuclear modification factor $R_{\rm AA}$, extrapolating the pp reference cross section to $p_{\rm T}$ larger than 8 GeV/$c$. The measured $R_{\rm AA}$ shows significant suppression of the yield of electrons from beauty-hadron decays at high $p_{\rm T}$ and does not show a significant dependence on $p_{\rm T}$ above 8 GeV/$c$ within uncertainties. The results are described by several theoretical models based on different implementations of the interaction of heavy quarks with a quark-gluon plasma, which predict a smaller energy loss for beauty quarks compared to light and charm quarks.
