Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s=13 TeV
Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at s=13 TeV
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测量 s=13-TeV 质子-质子碰撞中 Z 玻色子与粲夸克或底夸克喷流的相关产生
DOI：
10.1103/physrevd.102.032007
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发表时间：
2020
影响因子：
5
通讯作者：
Flechl, M.
中科院分区：
文献类型：
--
作者：
Sirunyan, A. M.;Tumasyan, A.;Adam, W.;Ambrogi, F.;Bergauer, T.;Brandstetter, J.;Dragicevic, M.;Erö, J.;Escalante Del Valle, A.;Flechl, M.
在质子-质子碰撞中测量与至少一种粲或底夸克射流相关的玻色子产生中的横截面比率、、和。由 CERN LHC 的 CMS 实验收集的数据样本对应于喷流的积分光度，基准体积为 和 ，其中 和 分别代表横向动量和伪速度。候选玻色子来自轻子衰变为电子或μ子，并且双轻子质量满足。测量值为σ(Z+c 射流)/σ(Z+射流)=0.102±0.002±0.009，σ(Z+b 射流)/σ(Z+射流)=0.0633±0.0004±0.0015，并且σ(Z+c 射流)/σ(Z+b 射流)=1.62±0.03±0.15。将包含和微分截面比作为射流和玻色子横向动量的函数的结果与前导和次前导微扰量子色动力学计算的预测进行比较。这是在 13 TeV 下首次测量横截面比。
Ratios of cross sections,,, andin the associated production of aboson with at least one charm or bottom quark jet are measured in proton-proton collisions at. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of, with a fiducial volume ofandfor the jets, whereandrepresent transverse momentum and pseudorapidity, respectively. Theboson candidates come from leptonic decays into electrons or muons withand, and the dilepton mass satisfies. The measured values are σ(Z+c jets)/σ(Z+jets)=0.102±0.002±0.009, σ(Z+b jets)/σ(Z+jets)=0.0633±0.0004±0.0015, and σ(Z+c jets)/σ(Z+b jets)=1.62±0.03±0.15. Results on the inclusive and differential cross section ratios as functions of jet andboson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.