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在质心能量平方根√[sNN]=2.76 TeV的铅-铅和质子-质子碰撞中,对即时ψ(2S)与J/ψ产额比的测量。

Measurement of prompt ψ(2S) to J/ψ yield ratios in Pb-Pb and p-p collisions at sqrt[sNN]=2.76  TeV.

作者信息

Khachatryan V, Sirunyan A M, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, Fabjan C, Friedl M, Frühwirth R, Ghete V M, Hartl C, Hörmann N, Hrubec J, Jeitler M, Kiesenhofer W, Knünz V, Krammer M, Krätschmer I, Liko D, Mikulec I, Rabady D, Rahbaran B, Rohringer H, Schöfbeck R, Strauss J, Taurok A, Treberer-Treberspurg W, Waltenberger W, Wulz C-E, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, Bansal M, Bansal S, Cornelis T, De Wolf E A, Janssen X, Knutsson A, Luyckx S, Ochesanu S, Roland B, Rougny R, Van De Klundert M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Daci N, Heracleous N, Keaveney J, Lowette S, Maes M, Olbrechts A, Python Q, Strom D, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem G P, Villella I, Caillol C, Clerbaux B, De Lentdecker G, Dobur D, Favart L, Gay A P R, Grebenyuk A, Léonard A, Mohammadi A, Perniè L, Reis T, Seva T, Thomas L, Vander Velde C, Vanlaer P, Wang J, Adler V, Beernaert K, 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机构信息

Yerevan Physics Institute, Yerevan, Armenia.

Institut für Hochenergiephysik der OeAW, Wien, Austria.

出版信息

Phys Rev Lett. 2014 Dec 31;113(26):262301. doi: 10.1103/PhysRevLett.113.262301.

DOI:10.1103/PhysRevLett.113.262301
PMID:25615312
Abstract

The ratio between the prompt ψ(2S) and J/ψ yields, reconstructed via their decays into μ+ μ-, is measured in Pb-Pb and p-p collisions at sqrt[sNN]=2.76  TeV. The analysis is based on Pb-Pb and p-p data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of 150  μb(-1) and 5.4  pb(-1), respectively. The double ratio of measured yields (Nψ(2S)/N(J/ψ))(Pb-Pb)/(Nψ(2S)/N(J/ψ))(p-p) is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, |y|<1.6, covering the transverse momentum range 6.5<pT<30  GeV/c, and the other at forward rapidity, 1.6<|y|<2.4, extending to lower pT values, 3<pT<30  GeV/c. The centrality-integrated double ratio changes from 0.45±0.13(stat)±0.07(syst) in the first range to 1.67±0.34(stat)±0.27(syst) in the second. This difference is most pronounced in the most central collisions.

摘要

通过ψ(2S)和J/ψ衰变为μ+μ-来重建,测量了在质心能量sqrt[sNN]=2.76 TeV的铅-铅和质子-质子碰撞中,ψ(2S)与J/ψ产额的比率。该分析基于欧洲核子研究中心(CMS)在大型强子对撞机上收集的铅-铅和质子-质子数据样本,分别对应于150 μb-1和5.4 pb-1的积分亮度。在三个铅-铅碰撞中心度区间和两个运动学范围内计算测量产额的双比率(Nψ(2S)/N(J/ψ))(Pb-Pb)/(Nψ(2S)/N(J/ψ))(p-p):一个在中快度,|y|<1.6,覆盖横向动量范围6.5<pT<30 GeV/c,另一个在前向快度,1.6<|y|<2.4,延伸到更低的pT值,3<pT<30 GeV/c。中心度积分双比率在第一个范围内从0.45±0.13(统计)±0.07(系统)变化到第二个范围内的1.67±0.34(统计)±0.27(系统)。这种差异在最中心的碰撞中最为明显。

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