论文标题
在$ \ sqrt {s_ \ mathrm {nn}} = 5.02 $ tev的pb+pb碰撞中，来自魅力和底部hadrons的方位角各向异性的测量
Measurement of azimuthal anisotropy of muons from charm and bottom hadrons in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with the ATLAS detector
论文作者
论文摘要
来自魅力和底部强子衰变的穆斯的方位角各向异性在$ \ sqrt {s_ \ mathrm {nn}} = 5.02 $ tev中以$ \ sqrt {s_ \ mathrm {s_ \ mathrm {s_ \ mathrm {s_ \ mathrm {s_ \ sqrt {该数据是在2015年和2018年与ATLAS检测器一起收集的，其集成的发光度为$ 0.5〜 \ MATHRM {nb}^{ - 1} $和$ 1.4〜 \ Mathrm {nb^{ - 1}}} $。重型amuons的运动学选择需要横向动量$ 4 <p_ \ mathrm {t} <30 $ gev和pseudorapities $ | |η| <2.0 $。在此$ p_ \ mathrm {t} $范围中，穆恩斯的主要来源是半leptonic的魅力和底部hadrons。这些重量味的雄性与轻度 - 火体衰变雄臂和打孔器的辐射分离，并使用跟踪探测器中的测量和恒星光谱仪之间的动量不平衡。通过流量系数量化的方位角各向异性是通过事件平面方法来测量的，用于包含重型味的muons作为MUON $ P_ \ MATHRM {T} $的函数，并以PB+PB碰撞中心的间隔来测量。使用MUON横向冲击参数相对于事件主要顶点，将重量味im族与符号和底部强子衰变分离为贡献。非零椭圆形（$ v_ {2} $）和三角形（$ v_ {3} $）流量系数是针对魅力和底部muons提取的，其魅力muon系数大于所有PB+PB碰撞中心的底部muons。结果表明，通过在这些Pb+Pb碰撞中产生的夸克 - 胶原等离子体中的相互作用，对魅力和底部夸克角分布进行了重大修改，由于其较大的质量，对底部夸克的修改较小。
Azimuthal anisotropies of muons from charm and bottom hadron decays are measured in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}}= 5.02$ TeV. The data were collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2018 with integrated luminosities of $0.5~\mathrm{nb}^{-1}$ and $1.4~\mathrm{nb^{-1}}$, respectively. The kinematic selection for heavy-flavor muons requires transverse momentum $4 < p_\mathrm{T} < 30$ GeV and pseudorapidity $|η|<2.0$. The dominant sources of muons in this $p_\mathrm{T}$ range are semi-leptonic decays of charm and bottom hadrons. These heavy-flavor muons are separated from light-hadron decay muons and punch-through hadrons using the momentum imbalance between the measurements in the tracking detector and in the muon spectrometers. Azimuthal anisotropies, quantified by flow coefficients, are measured via the event-plane method for inclusive heavy-flavor muons as a function of the muon $p_\mathrm{T}$ and in intervals of Pb+Pb collision centrality. Heavy-flavor muons are separated into contributions from charm and bottom hadron decays using the muon transverse impact parameter with respect to the event primary vertex. Non-zero elliptic ($v_{2}$) and triangular ($v_{3}$) flow coefficients are extracted for charm and bottom muons, with the charm muon coefficients larger than those for bottom muons for all Pb+Pb collision centralities. The results indicate substantial modification to the charm and bottom quark angular distributions through interactions in the quark-gluon plasma produced in these Pb+Pb collisions, with smaller modifications for the bottom quarks as expected theoretically due to their larger mass.
