Tea Time学术活动系列邀请报告(139)

题  目：Anisotropies in heavy-ion collisions

报告人：Prof.Jovan Milosevic

        (Universityof Belgrade, Vinca Institute of Nuclear Sciences)

时  间：2019年11月1日（周五）16：00

地  点：1-401物理学科会议室

报告内容：

The$v_{2}$ and $v_{3}$ harmonics in PbAu collisions at 17.3 GeV aremeasured using the event plane method. Two-dimensional two-particlecorrelations are used to extract $v_{n}$ harmonics up to the 7-th orderfrom ultra-central PbPb collisions at the LHC energy. The same method isused to study anisotropies in small systems formed in pp, pPb andperipheral PbPb collisions. Beside the appearance of the higher orderharmonics, the initial-state fluctuations also induce transverse momentum($p_{T}$) and pseudorapidity ($/eta$) dependence of the event plane whichleads to so called factorization breaking. It is studied in pPb and PbPbcollisions at the LHC energies. A relatively new method of PrincipalComponent Analysis (PCA) is used to show the existence of the sub-leading flowmodes of the $v_{2}$ and $v_{3}$ harmonics in pPb and PbPb collisions atthe LHC energies. They are connected with the factorization breaking, andPearson coefficients, extracted from the sub-leading flow modes are in arather good agreement with the standardly measured factorization breaking.The HYDJET++ model shows the existence of the sub-leading flow modes inPbPb collisions, and they are in a good agreement with theexperimental data. Also, skewness of the elliptic flow distributionsmeasured using the method of cumulants in HYDJET++ simulations are in arather good agreement with the experimental results. The correlationsbetween the $v_{2}$, $v_{3}$ and $v_{4}$ harmonics are studied by the AMPTand HYDJET++ model. The AMPT model shows a good agreement with theexperimental data, while it is not the case for the HYDJET++ predictions.

报告人简介：

Jovan Milosevic，塞尔维亚贝尔格莱德大学教授、Vinca核科学研究所研究员，2003年在德国海德堡大学取得博士学位，2003-2010年分别在德国海德堡大学和挪威奥斯陆大学从事博士后研究工作。目前是欧洲核子研究中心大型强子对撞机LHC上CMS实验组的合作成员，长期致力于相对论重离子碰撞的实验和唯象研究，在重离子碰撞中各向异性流、碰撞中喷注与集体效应相互作用等领域有丰富的研究成果，已在Phys. Rev.Lett., Phys. Lett. B, Phys. Rev. C, Nucl. Phys. A, JHEP等学术刊物上发表SCI论文50余篇。