在\(\sqrt{s_{NN}} = 5.02\) TeV的超外围铅-铅碰撞中对双μ子非共面性的前向中子多重性依赖性的观测。
Observation of Forward Neutron Multiplicity Dependence of Dimuon Acoplanarity in Ultraperipheral Pb-Pb Collisions at sqrt[s_{NN}]=5.02 TeV.
作者信息
Sirunyan A M, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, Escalante Del Valle A, Frühwirth R, Jeitler M, Krammer N, Lechner L, Liko D, Madlener T, Mikulec I, Pitters F M, Rad N, Schieck J, Schöfbeck R, Spanring M, Templ S, Waltenberger W, Wulz C-E, Zarucki M, Chekhovsky V, Litomin A, Makarenko V, Suarez Gonzalez J, Darwish M R, De Wolf E A, Di Croce D, Janssen X, Kello T, Lelek A, Pieters M, Rejeb Sfar H, Van Haevermaet H, Van Mechelen P, Van Putte S, Van Remortel N, Blekman F, Bols E S, Chhibra S S, D'Hondt J, De Clercq J, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Morton A, Python Q, Tavernier S, Van Doninck W, Van Mulders P, Beghin D, Bilin B, Clerbaux B, De Lentdecker G, Dorney B, Favart L, Grebenyuk A, Kalsi A K, Makarenko I, Moureaux L, Pétré L, Popov A, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wezenbeek L, Cornelis T, Dobur D, Gruchala M, Khvastunov I, Niedziela M, Roskas C, Skovpen K, Tytgat M, Verbeke W, Vermassen B, Vit M, 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机构信息
Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik, Wien, Austria.
出版信息
Phys Rev Lett. 2021 Sep 17;127(12):122001. doi: 10.1103/PhysRevLett.127.122001.
The first measurement of the dependence of γγ→μ^{+}μ^{-} production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at sqrt[s_{NN}]=5.02 TeV, with an integrated luminosity of approximately 1.5 nb^{-1}, are collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8<m_{μμ}<60 GeV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range |η|>8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.
报道了在超外围重离子碰撞中，首次测量γγ→μ⁺μ⁻产生对非常靠近束流方向发射的中子多重性的依赖性。使用大型强子对撞机的CMS探测器，收集了质心能量√[sNN]=5.02 TeV下铅-铅相互作用的数据，积分亮度约为1.5 nb⁻¹。对于在正向赝快度范围|η|>8.3中探测到0、1或至少2个中子的事件，提取了不变质量区域8<mμμ<60 GeV内两个μ子之间的方位角关联。对于每个原子核发射中子数较多的事件，即对应于碰撞参数较小的相互作用，发现领先阶光子-光子散射的背对背关联结构明显更宽。这一观测结果提供了一个数据驱动的证明，即相对论重离子发射的光子的平均横向动量具有碰撞参数依赖性。这些结果对超外围碰撞中光子诱导相互作用的模型提供了新的限制。它们还为寻找强子重离子碰撞中产生的夸克-胶子等离子体对轻子对可能的末态效应提供了一个基线。
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