在\(\sqrt{s_{NN}} = 5.02\) TeV下，质子-质子对撞到铅-铅对撞中瞬发\(\psi(2S)\)和\(J/\psi\)产额的相对修正
Relative Modification of Prompt ψ(2S) and J/ψ Yields from pp to PbPb Collisions at sqrt[s_{NN}]=5.02 TeV.
作者信息
Sirunyan A M, Tumasyan A, Adam W, Asilar E, Bergauer T, Brandstetter J, Brondolin E, Dragicevic M, Erö J, Flechl M, Friedl M, Frühwirth R, Ghete V M, Hartl C, Hörmann N, Hrubec J, Jeitler M, König A, Krätschmer I, Liko D, Matsushita T, Mikulec I, Rabady D, Rad N, Rahbaran B, Rohringer H, Schieck J, Strauss J, Waltenberger W, Wulz C-E, Chekhovsky V, Dvornikov O, Dydyshka Y, Emeliantchik I, Litomin A, Makarenko V, Mossolov V, Stefanovitch R, Suarez Gonzalez J, Zykunov V, Shumeiko N, Alderweireldt S, De Wolf E A, Janssen X, Lauwers J, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Abu Zeid S, Blekman F, D'Hondt J, Daci N, De Bruyn I, Deroover K, Lowette S, Moortgat S, Moreels L, Olbrechts A, Python Q, Skovpen K, Tavernier S, Van Doninck W, Van Mulders P, Van Parijs I, Brun H, Clerbaux B, De Lentdecker G, Delannoy H, Fasanella G, Favart L, Goldouzian R, Grebenyuk A, Karapostoli G, Lenzi T, Léonard A, Luetic J, Maerschalk T, Marinov A, Randle-Conde A, 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Polese G, Ruggles T, Savin A, Smith N, Smith W H, Taylor D, Woods N
机构信息
Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik, Wien, Austria.
出版信息
Phys Rev Lett. 2017 Apr 21;118(16):162301. doi: 10.1103/PhysRevLett.118.162301. Epub 2017 Apr 20.
The relative modification of the prompt ψ(2S) and J/ψ yields from pp to PbPb collisions, at the center-of-mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb^{-1} and 464 μb^{-1}, respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (N_{ψ(2S)}/N_{J/ψ}){PbPb}/(N{ψ(2S)}/N_{J/ψ}){pp}, is determined as a function of PbPb collision centrality and charmonium transverse momentum p{T}, in two kinematic intervals: |y|<1.6 covering 6.5<p_{T}<30 GeV/c and 1.6<|y|<2.4 covering 3<p_{T}<30 GeV/c. The centrality-integrated double ratios are 0.36±0.08(stat)±0.05(syst) in the first interval and 0.24±0.22(stat)±0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the ψ(2S) yield is more suppressed than the J/ψ yield in the explored phase space.
给出了在每核子对质心能量为5.02 TeV时，从质子-质子（pp）碰撞到铅-铅（PbPb）碰撞中，即时ψ(2S)和J/ψ产率的相对修正。该分析基于CMS实验在2015年于大型强子对撞机（LHC）上收集的pp和PbPb数据样本，分别对应于28.0 pb⁻¹和464 μb⁻¹的积分亮度。通过其衰变为μ子对来重建的即时粲夸克偶素的测量产率的双比值，即(N_{ψ(2S)}/N_{J/ψ}){PbPb}/(N{ψ(2S)}/N_{J/ψ}){pp}，作为PbPb碰撞中心度和粲夸克偶素横向动量p{T}的函数来确定，在两个运动学区间：|y|<1.6，涵盖6.5<p_{T}<30 GeV/c，以及1.6<|y|<2.4，涵盖3<p_{T}<30 GeV/c。在第一个区间，中心度积分双比值为0.36±0.08（统计）±0.05（系统），在第二个区间为0.24±0.22（统计）±0.09（系统）。在所有测量的区间中，双比值均低于1，这表明在探索的相空间中，ψ(2S)产率比J/ψ产率受到的抑制更大。
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