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arXiv 1204.0696hep-ex
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在sqrt(s)= 7 TeV的质子-质子碰撞中作为喷流之间速度绝对差的函数的双喷流产生截面的比率

Ratios of dijet production cross sections as a function of the absolute difference in rapidity between jets in proton-proton collisions at sqrt(s) = 7 TeV

CMS Collaboration

摘要:

在sqrt(s)= 7 TeV的质子-质子碰撞中,使用2010年LHC CMS探测器收集的数据,对pt > 35 GeV和abs(y)< 4.7的喷流进行了双喷流产生的研究。具有至少一对喷流的事件被表示为“包含”。只有一对喷流的事件被称为“独占”。第一次测量了所有成对喷流组合的截面与排他的双喷流截面的比值,它是喷流之间的快度差abs(Delta(y))的函数,直到abs(Delta(y))= 9.2。还给出了包容性样品的最向前和最向后射流对的截面与排他性双射流截面的比值。蒙特卡罗事件发生器PYTHIA 6和PYTHIA 8的预测与测量结果一致。在两个比率中,HERWIG++发生器相对于abs(Delta(y))的上升比数据中观察到的更明显。BFKL驱动的发电机CASCADE和HEJ+ARIADNE预测这些比率的上升比观察到的要大得多。

英文摘要:

A study of dijet production in proton-proton collisions was performed at sqrt(s) = 7 TeV for jets with pt > 35 GeV and abs(y) < 4.7 using data collected with the CMS detector at the LHC in 2010. Events with at least one pair of jets are denoted as "inclusive". Events with exactly one pair of jets are called "exclusive". The ratio of the cross section of all pairwise combinations of jets to the exclusive dijet cross section as a function of the rapidity difference between jets abs(Delta(y)) is measured for the first time up to abs(Delta(y)) = 9.2. The ratio of the cross section for the pair consisting of the most forward and the most backward jet from the inclusive sample to the exclusive dijet cross section is also presented. The predictions of the Monte Carlo event generators PYTHIA6 and PYTHIA8 agree with the measurements. In both ratios the HERWIG++ generator exhibits a more pronounced rise versus abs(Delta(y)) than observed in the data. The BFKL-motivated generators CASCADE and HEJ+ARIADNE predict for these ratios a significantly stronger rise than observed.

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