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arXiv 1302.6508hep-ex
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在sqrt(s)=1.96 TeV的p \bar{p}碰撞中W玻色子加喷注产生的研究

Studies of W boson plus jets production in p\bar{p} collisions at sqrt(s)=1.96 TeV

D0 Collaboration

摘要:

利用D 0探测器收集的3.7 fb^{-1}数据集,对Tevatron对撞机上质心能量为1.96 TeV的质子-反质子碰撞中包含W(\to eν)+n喷流(n \geq 1,2,3,4)的产生进行了全面分析.给出了微分截面随喷注快度(y)、轻子横动量(p_T)和赝快度(η)、W玻色子和所有喷注的横向能量的标量和(H_T)、双喷注的前向动量(p_T)和不变质量、p_T序喷注和角序喷注的各种喷注对的双喷注快度间隔、双喷注张开角、p_T有序喷注和角有序喷注的双喷注方位角间距,以及W玻色子的横动量。测量了含有W玻色子的事件中喷注的平均数,它是H_T的函数,也是两个最高p_T喷注之间和两个最大快度喷注之间的快度间隔的函数。最后,通过测量包含W+2喷注的样本中包含第三喷注的事件在pT阈值以上的比例,研究了包含一个W玻色子和至少两个喷注的事件中第三喷注发射的概率。该分析采用了正则化奇异值分解技术,以准确地纠正检测器的影响和背景的存在。校正后的数据进行比较,粒子水平下到领先阶微扰QCD预测,预测从所有订单remation的方法,和各种领先的顺序和矩阵元素加上部分子簇射事件发生器。区域的相空间,其中有协议或不同意的数据进行了讨论,为不同的模型进行测试。

英文摘要:

We present a comprehensive analysis of inclusive W(\to eν)+n-jet (n\geq 1,2,3,4) production in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV at the Tevatron collider using a 3.7 fb^{-1} dataset collected by the D0 detector. Differential cross sections are presented as a function of the jet rapidities (y), lepton transverse momentum (p_T) and pseudorapidity (η), the scalar sum of the transverse energies of the W boson and all jets (H_T), leading dijet p_T and invariant mass, dijet rapidity separations for a variety of jet pairings for p_T-ordered and angular-ordered jets, dijet opening angle, dijet azimuthal angular separations for p_T-ordered and angular-ordered jets, and W boson transverse momentum. The mean number of jets in an event containing a W boson is measured as a function of H_T, and as a function of the rapidity separations between the two highest-p_T jets and between the most widely separated jets in rapidity. Finally, the probability for third-jet emission in events containing a W boson and at least two jets is studied by measuring the fraction of events in the inclusive W+2-jet sample that contain a third jet over a p_T threshold. The analysis employs a regularized singular value decomposition technique to accurately correct for detector effects and for the presence of backgrounds. The corrected data are compared to particle level next-to-leading order perturbative QCD predictions, predictions from all-order resummation approaches, and a variety of leading-order and matrix-element plus parton-shower event generators. Regions of the phase space where there is agreement or disagreement with the data are discussed for the different models tested.

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