在 √s=1.96 TeV 的 pp 碰撞中测量 Z 玻色子与粲夸克喷注的伴随产生。
Measurement of associated production of z bosons with charm quark jets in pp collisions at √s=1.96 TeV.
机构信息
Joint Institute for Nuclear Research, Dubna, Russia.
University of Oklahoma, Norman, Oklahoma 73019, USA.
出版信息
Phys Rev Lett. 2014 Jan 31;112(4):042001. doi: 10.1103/PhysRevLett.112.042001. Epub 2014 Jan 27.
We present the first measurements of the ratios of cross sections σ(pp → Z+c jet)/σ(pp → Z+jet) and σ(pp → Z+c jet)/σ(pp → Z+b jet) for the associated production of a Z boson with at least one charm or bottom quark jet. Jets have transverse momentum pT(jet)>20 GeV and pseudorapidity |η(jet)|<2.5. These cross section ratios are measured differentially as a function of jet and Z boson transverse momenta, based on 9.7 fb(-1) of pp collisions collected with the D0 detector at the Fermilab Tevatron Collider at √s=1.96 TeV. The measurements show significant deviations from perturbative QCD calculations and predictions from various event generators.
我们首次测量了在费米实验室 Tevatron 对撞机上以 √s=1.96 TeV 运行时，pp 对撞产生的 Z 玻色子伴随产生至少一个粲或底夸克喷注的过程中，截面比 σ(pp→Z+c 喷注)/σ(pp→Z+喷注)和 σ(pp→Z+c 喷注)/σ(pp→Z+b 喷注)。喷注的横动量 pT(jet)>20 GeV，赝快度|η(jet)|<2.5。这些截面比是基于 D0 探测器在 9.7 fb-1 的 pp 碰撞数据中，在喷注和 Z 玻色子横动量的微分范围内测量得到的。测量结果与微扰量子色动力学计算以及各种事件生成器的预测有显著偏离。
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