论文标题
观察B $ _ \ Mathrm {C}^+$ Meson在PBPB和PP Collisions $ \ sqrt {s _ {\ Mathrm {nn}}} = $ 5.02 TEV及其核修饰因子的测量值
Observation of the B$_\mathrm{c}^+$ meson in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}} =$ 5.02 TeV and measurement of its nuclear modification factor
论文作者
论文摘要
B $ _ \ MATHRM {C}^+$ MESON首次在重离子碰撞中观察到。来自CMS检测器的数据用于研究B $ _ \ Mathrm {C}^+$ $ Meson在Lead-Lead（PBPB）中（PBPB）和Proton-Proton（PP）的碰撞，每核每个核子的核能中心$ \ sqrt {s _ {s _ { b $ _ \ mathrm {c}^+$ $ \ to $（j/$ψ$ \ $ \ to $ $μ^+μ^ - $）$μ^+ν_μ$ decay。 B $ _ \ MATHRM {C}^+$核修饰因子，源自生产横截面的PBPB与PP的比率，在Trimuon横向动量的两个垃圾箱中测量和PBPB碰撞中心性。 B $ _ \ MATHRM {C}^+$ MESON被证明不如Quarkonia和大多数开放的重型梅森氏菌所受到的抑制作用，这表明重离子碰撞中造成的热和密集的核物质的影响有助于其产量。这种测量结果阐明了在夸克 - 胶原等离子体中抑制和增强机制相互作用的新探针。
The B$_\mathrm{c}^+$ meson is observed for the first time in heavy ion collisions. Data from the CMS detector are used to study the production of the B$_\mathrm{c}^+$ meson in lead-lead (PbPb) and proton-proton (pp) collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}} =$ 5.02 TeV, via the B$_\mathrm{c}^+$ $\to$ (J/$ψ$ $\to$ $μ^+μ^-$)$μ^+ν_μ$ decay. The B$_\mathrm{c}^+$ nuclear modification factor, derived from the PbPb-to-pp ratio of production cross sections, is measured in two bins of the trimuon transverse momentum and of the PbPb collision centrality. The B$_\mathrm{c}^+$ meson is shown to be less suppressed than quarkonia and most of the open heavy-flavor mesons, suggesting that effects of the hot and dense nuclear matter created in heavy ion collisions contribute to its production. This measurement sets forth a promising new probe of the interplay of suppression and enhancement mechanisms in the production of heavy-flavor mesons in the quark-gluon plasma.
