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arXiv 1208.1967hep-exnucl-ex
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在sqrt(s(NN))= 2.76 TeV的铅-铅碰撞中单个喷流抑制的喷流尺寸依赖性,ATLAS探测器位于LHC

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

ATLAS Collaboration

摘要:

在大型强子对撞机(LHC)的重离子碰撞中,对包容性喷流抑制的测量提供了对喷流淬灭物理学的直接敏感性。在sqrt(s)= 2.76 TeV的铅-铅碰撞样品中,对应于大约7个逆微仓的积分亮度,ATLAS用量热计测量了赝快度间隔|eta| < 2.1和横动量范围38 < pT < 210 GeV的喷流。使用反kt算法重建射流,其中距离参数的值确定标称射流半径R = 0.2、0.3、0.4和0.5。射流产率的中心依赖性的特征在于射流的“中心-周边比”,Rcp。喷气生产被发现被抑制约两个因素,在10%的最中心的碰撞相对于周边的碰撞。RCP随中心性的变化是平滑的,中心性的特征是参与的核子数。所观察到的抑制仅弱依赖于射流半径和横向动量。这些结果提供了第一次直接测量包含喷流抑制重离子碰撞和补充以前的测量在大型强子对撞机的双射流横向能量不平衡。

英文摘要:

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.

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