论文标题
搜索具有高$ P_T $ HADRON的QGP液滴和浓厚的味道
Searching for QGP droplets with high-$p_T$ hadrons and heavy flavor
论文作者
论文摘要
在自然界中寻找最小的夸克 - 基因等离子体（QGP）液滴激发了RHIC和LHC最近的小型碰撞系统计划。由于最终状态相互作用而导致的射流淬灭是确认这些反应中QGP形成的关键。我们计算核修饰因子$ r_ {aa} $和$ r_ {p（d）a} $的充电Hadrons和重型风味梅森（Au-Au，Xe-Xe-Xe，pb-pb）和Small（$ d $ -au，$ d $ -au，$ p $ -p $ -pb，o-o-o-o-o-o）碰撞系统。我们的结果包括冷核物质中的cronin效应和初始状态parton能量损失。在最终状态下，硬性球顿经历了碰撞的能量损失和分支，最近使用glauber gluon（scet $ _ {\ rm g} $）得出了使用软性电线效应理论。在大型碰撞系统中，片段化功能的中等修饰的QCD演变主导核校正。随着系统大小的减小，我们发现冷核物质效应，碰撞能量损失和QGP引起的辐射可能变得同样重要。 $ r_ {aa} $的中等大小和质量/风味依赖性的系统扫描为分离这些个人贡献并识别小型系统中的QGP签名提供了机会。 $ r_ {aa}^{h} $，$ r_ {aa}^{d} $，$ r_ {aa}^{aa}^{b} $在$ \ sqrt {s} = 7 $ tev中与qgp和不相反的$ cont a a colland colland colland colland colcounct a a a collisions的预测。 LHC处的即将进行的单人载测量不仅会测试光和浓烈风味产生的O-O预测，而且还会阐明$ p $ -a -a的动态和以类似的软颗粒生产多重性的截然不同的动态。
The search for the smallest quark-gluon plasma (QGP) droplets in nature has motivated recent small collisions system programs at RHIC and LHC. Unambiguous identification of jet quenching due to final-state interactions is key to confirming QGP formation in these reactions. We compute the nuclear modification factors $R_{AA}$ and $R_{p(d)A}$ of charged hadrons and heavy flavor mesons in large (Au-Au, Xe-Xe, Pb-Pb) and small ($d$-Au, $p$-Pb, O-O) colliding systems, respectively. Our results include the Cronin effect and initial-state parton energy loss in cold nuclear matter. In the final state, hard partons undergo collisional energy loss and branching that was recently derived using Soft-Collinear-Effective-Theory with Glauber Gluon (SCET$_{\rm G}$). In large colliding systems, medium-modified QCD evolution of the fragmentation functions dominates the nuclear correction. As the system size decreases, we find that cold nuclear matter effects, collisional energy loss, and QGP-induced radiations can become equally important. A systematic scan over the medium size and mass/flavor dependence of $R_{AA}$ provides the opportunity to separate these individual contributions and identify QGP signatures in small systems. Predictions for $R_{AA}^{h}$, $R_{AA}^{D}$, $R_{AA}^{B}$ in O-O collisions at $\sqrt{s}=7$ TeV are presented with and without the formation of a QGP and contrasted with the corresponding $R_{p(d)A}$ calculations. Upcoming single-hadron measurements at the LHC will not only test the O-O predictions for both light and heavy flavor production, but will shed light on the possibly very different dynamics of $p$-A and A-A reactions at similar soft particle production multiplicities.
