论文标题
$ \ sqrt {s _ {\ rm nn}} = 5.02 $ tev通过non-prompt $ \ mathrm {d_s}^{d_s}^{+}
Measurement of beauty-strange meson production in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV via non-prompt $\mathrm{D_s}^{+}$ mesons
论文作者
论文摘要
非预测$ \ mathrm {d_s}^{+} $ mesons的产量，即$ \ mathrm {d_s}^{+} $ hadron衰变的$梅森斯，首次测量了横向动量的函数，是第一次衡量的（$ p _ {$ rm tm t | y | rm t} $ |）半中央pb $ - $ pb碰撞，每核对$ \ sqrt {s _ {\ rm nn}} = 5.02 $ tev the lhc的爱丽丝实验。 $ \ mathrm {d_s}^{+} $ mesons及其电荷结合物是从hadronic衰变通道$ \ mathrm {d_s}^{+} \ to to { t} <36 $ gev/$ c $和$ 2 <p _ {\ rm t} <24 $ gev/$ c $ 0 $ - $ 10％和30 $ - $ 50％的中心级别。比较了非prompt $ \ mathrm {d_s}^{+} $中的测量收益率与及时的$ \ mathrm {d_s}^{+} $和非prompt $ \ mathrm {d^0} $ Mesons的生产率和PB $ -PB的比率， $ r_ \ mathrm {aa} $。 $ r_ \ mathrm {aa} $的$ \ mathrm {d_s}^{+} $和提示$ \ mathrm {d_s}^{d_s}^{+} $ mesons之间在中央PB $ - $ PB碰撞中的非预付款$ \ MATHRM {D^0} $ MESON在$ 4 <p _ {\ rm t} <12 $ gev/$ c $间隔中的统计学意义平均高于unity，其统计学意义约为$ 1.6 \ \ \ \ \ \，σ$和$ 1.7 \ f，相应地相应。将测量的$ r_ \ mathrm {aa} $比率与在流体动力扩展的QGP中的理论模型的预测进行了比较，该模型通过夸克重组结合了强调。
The production yields of non-prompt $\mathrm{D_s}^{+}$ mesons, namely $\mathrm{D_s}^{+}$ mesons from beauty-hadron decays, were measured for the first time as a function of the transverse momentum ($p_{\rm T}$) at midrapidity ($|y|<0.5$) in central and semi-central Pb$-$Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV with the ALICE experiment at the LHC. The $\mathrm{D_s}^{+}$ mesons and their charge conjugates were reconstructed from the hadronic decay channel $\mathrm{D_s}^{+} \to ϕπ^+$, with $ϕ\to {\rm K}^-{\rm K}^+$, in the $4 < p_{\rm T}<36$ GeV/$c$ and $2 < p_{\rm T}<24$ GeV/$c$ intervals for the 0$-$10% and 30$-$50% centrality classes, respectively. The measured yields of non-prompt $\mathrm{D_s}^{+}$ mesons are compared to those of prompt $\mathrm{D_s}^{+}$ and non-prompt $\mathrm{D^0}$ mesons by calculating the ratios of the production yields in Pb$-$Pb collisions and the nuclear modification factor $R_\mathrm{AA}$. The ratio between the $R_\mathrm{AA}$ of non-prompt $\mathrm{D_s}^{+}$ and prompt $\mathrm{D_s}^{+}$ mesons, and that between the $R_\mathrm{AA}$ of non-prompt $\mathrm{D_s}^{+}$ and non-prompt $\mathrm{D^0}$ mesons in central Pb$-$Pb collisions are found to be on average higher than unity in the $4< p_{\rm T}<12$ GeV/$c$ interval with a statistical significance of about $1.6\,σ$ and $1.7\,σ$, respectively. The measured $R_\mathrm{AA}$ ratios are compared with the predictions of theoretical models of heavy-quark transport in a hydrodynamically expanding QGP that incorporate hadronisation via quark recombination.
