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arXiv 1807.05974hep-ex
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在$\sqrt{s} =$ 13 TeV质子-质子碰撞中作为喷流质量函数的微分喷流截面的测量

Measurements of the differential jet cross section as a function of the jet mass in dijet events from proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

差射流截面的测量作为双射流事件中射流质量的函数,在射流横向动量的仓中,有和没有射流梳理算法。这些数据是CMS协作组在大型强子对撞机的质子-质子碰撞中记录的,质心能量为13 TeV,对应的积分亮度为2.3 fb $^{-1}$。绝对截面在数据和Monte Carlo事件发生器中显示了所用设置的略微不同的射流横向动量谱。去除这种横向动量的依赖性,归一化的截面的ungroomed射流是一致的,从蒙特卡罗事件发生器的预测质量低于30%的横向动量。与未修饰的截面相比,修饰的射流的归一化截面的测量精度更高。超过领先的对数精度的射流质量的半解析计算进行比较的数据,以及在领先的订单和下一个领先的订单,其中包括部分子淋浴和强子化的预测。总的来说,在归一化的截面中,理论预测与测量的截面一致,在质量为射流横向动量的10%到30%的不确定性范围内。

英文摘要:

Measurements of the differential jet cross section are presented as a function of jet mass in dijet events, in bins of jet transverse momentum, with and without a jet grooming algorithm. The data have been recorded by the CMS Collaboration in proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 2.3 fb$^{-1}$. The absolute cross sections show slightly different jet transverse momentum spectra in data and Monte Carlo event generators for the settings used. Removing this transverse momentum dependence, the normalized cross section for ungroomed jets is consistent with the prediction from Monte Carlo event generators for masses below 30% of the transverse momentum. The normalized cross section for groomed jets is measured with higher precision than the ungroomed cross section. Semi-analytical calculations of the jet mass beyond leading logarithmic accuracy are compared to data, as well as predictions at leading order and next-to-leading order, which include parton showering and hadronization. Overall, in the normalized cross section, the theoretical predictions agree with the measured cross sections within the uncertainties for masses from 10 to 30% of the jet transverse momentum.

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