TeV = 1.96时ppbar碰撞中Z γ产生和Z γ和Z γ反常耦合的极限
Zgamma production and limits on anomalous ZZgamma and Zgammagamma couplings in ppbar collisions at sqrt(s) = 1.96 TeV
摘要：
我们分别利用电子（μ子）通道的1109（1009）pb-1数据对eegamma和mumugamma事件进行了研究。这些数据是用费米实验室Tevatron ppbar对撞机的D 0探测器在sqrt（s）= 1.96 TeV下收集的。在观察了453（515）个处于eegamma（mumugamma）最终状态的候选者后，我们测量了横向能量ET > 7 GeV、光子和轻子之间的间隔Delta R（lgamma）> 0.7以及双轻子对的不变质量M（ll）> 30 GeV/c^2的光子的Zgamma产生截面。为4.96 +/- 0.30（统计。+ 系统）+/- 0.30（流明）pb，与标准模型预测的4.74 +/- 0.22 pb一致。这是在强子对撞机上最精确的Z伽马截面测量。在95% C. L下，我们对Z γ γ和Z Z γ规范玻色子的三线性反常耦合分别设定了-0.085 < h（30）^（gamma）< 0.084，-0.0053 < h（40）^（gamma）< 0.0054和-0.083 < h（30）^（Z）< 0.082，-0.0053 < h（40）^（Z）< 0.0054的极限。对于形状因子尺度λ = 1.2 TeV。
英文摘要：
We present a study of eegamma and mumugamma events using 1109 (1009) pb-1 of data in the electron (muon) channel, respectively. These data were collected with the D0 detector at the Fermilab Tevatron ppbar Collider at sqrt(s) = 1.96 TeV. Having observed 453 (515) candidates in the eegamma (mumugamma) final state, we measure the Zgamma production cross section for a photon with transverse energy ET > 7 GeV, separation between the photon and leptons Delta R(lgamma) > 0.7, and invariant mass of the di-lepton pair M(ll) > 30 GeV/c^2, to be 4.96 +/- 0.30(stat. + syst.) +/- 0.30(lumi.) pb, in agreement with the standard model prediction of 4.74 +/- 0.22 pb. This is the most precise Zgamma cross section measurement at a hadron collider. We set limits on anomalous trilinear Zgammagamma and ZZgamma gauge boson couplings of -0.085 < h(30)^(gamma) < 0.084, -0.0053 < h(40)^(gamma) < 0.0054 and -0.083 < h(30)^(Z) < 0.082, -0.0053 < h(40)^(Z) < 0.0054 at the 95% C.L. for the form-factor scale Lambda = 1.2 TeV.
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