论文标题
$ \ sqrt {s_ \ mathrm {nn}} $ = 5.02 TEV
Measurements of azimuthal anisotropy of nonprompt D$^0$ mesons in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
论文作者
论文摘要
椭圆形（$ v_2 $）和三角形（$ v_3 $）方差方向异性系数的测量值是针对B强子衰变（nonprompt d $^0 $ ersons）在$ \ sqrt coltions in B Lead-lead collisions in B Hadron Decays（nonprompt D $^0 $ MESON）产生的d $^0 $ ersons的测量值。将结果与先前发表的魅力介孔各向异性进行了比较，该魅力使用提示d $^0 $介子测量。数据在2018年与CMS检测器收集，集成光度为0.58 nb $^{ - 1} $。方位角各向异性对与重离子碰撞中产生的热和致密培养基的相互作用敏感。比较迅速和非竞争的结果d $^0 $介体可以帮助理解这些相互作用的质量依赖性。非宣传结果显示，比及时的D $^0 $ MESON的介体横向动量和碰撞中心性较低的幅度为$ v_2 $和$ v_3 $，对介子横向动量和碰撞中心的依赖性较弱。结果与理论预测一致，这些预测包括夸克与培养基的相互作用的质量依赖性。
Measurements of the elliptic ($v_2$) and triangular ($v_3$) azimuthal anisotropy coefficients are presented for D$^0$ mesons produced in b hadron decays (nonprompt D$^0$ mesons) in lead-lead collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The results are compared with previously published charm meson anisotropies measured using prompt D$^0$ mesons. The data were collected with the CMS detector in 2018 with an integrated luminosity of 0.58 nb$^{-1}$. Azimuthal anisotropy is sensitive to the interactions of quarks with the hot and dense medium created in heavy ion collisions. Comparing results for prompt and nonprompt D$^0$ mesons can assist in understanding the mass dependence of these interactions. The nonprompt results show lower magnitudes of $v_2$ and $v_3$ and weaker dependences on the meson transverse momentum and collision centrality than those found for prompt D$^0$ mesons. The results are in agreement with theoretical predictions that include a mass dependence in the interactions of quarks with the medium.
