Properties of jets measured from tracks in proton-proton collisions at center-of-mass energy sqrt(s) = 7 TeV with the ATLAS detector
Properties of jets measured from tracks in proton-proton collisions at center-of-mass energy sqrt(s) = 7 TeV with the ATLAS detector
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DOI：
10.1103/physrevd.84.054001
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发表时间：
2011-07
期刊：
影响因子：
--
通讯作者：
Atlas Collaboration
中科院分区：
文献类型：
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作者：
Atlas Collaboration
在大型强子对撞机上利用ATLAS内探测器测量的带电粒子，研究了质心能量sqrt（s）= 7 TeV的质子-质子碰撞中的喷流及其性质.事件的选择使用最小的偏置触发，允许射流在非常低的横向动量进行观察，并在过渡到高动量完全扰动射流的特性进行研究。使用反KT算法应用于带电粒子与两个半径参数的选择，0.4和0.6重建射流。一个包容性的带电射流横向动量截面测量从4 GeV到100 GeV的四个范围内的速度延伸到1.9和带电粒子级的真理射流校正。测量了射流中带电粒子的横向动量和纵向动量分数，沿着测量了带电粒子的多重性和粒子密度随射流轴线径向距离的变化。比较的数据与理论模型实现在现有的调谐的Monte Carlo事件发生器的数据和Monte Carlo之间的合理的总体协议。这些比较对蒙特卡罗部分子簇射、强子化和软物理模型很敏感。
Jets are identified and their properties studied in center-of-mass energy sqrt(s) = 7 TeV proton-proton collisions at the Large Hadron Collider using charged particles measured by the ATLAS inner detector. Events are selected using a minimum bias trigger, allowing jets at very low transverse momentum to be observed and their characteristics in the transition to high-momentum fully perturbative jets to be studied. Jets are reconstructed using the anti-kt algorithm applied to charged particles with two radius parameter choices, 0.4 and 0.6. An inclusive charged jet transverse momentum cross section measurement from 4 GeV to 100 GeV is shown for four ranges in rapidity extending to 1.9 and corrected to charged particle-level truth jets. The transverse momenta and longitudinal momentum fractions of charged particles within jets are measured, along with the charged particle multiplicity and the particle density as a function of radial distance from the jet axis. Comparison of the data with the theoretical models implemented in existing tunings of Monte Carlo event generators indicates reasonable overall agreement between data and Monte Carlo. These comparisons are sensitive to Monte Carlo parton showering, hadronization, and soft physics models.