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arXiv 1006.0618hep-ex
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在sqrt{s}=1.96 TeV的p \bar{p}碰撞中归一化Z/gamma*->mu+mu-横向动量分布的测量

Measurement of the normalized Z/gamma*->mu+mu- transverse momentum distribution in p\bar{p} collisions at sqrt{s}=1.96 TeV

D0 Collaboration

摘要:

本文报道了在sqrt{s}= 1.96TeV的质子-反质子碰撞中,在0 - 330 GeV范围内Z/γ * 横动量分布的一种新的测量.该测量使用D 0实验记录的0.97 fb-1的积分亮度,并且是第一次在该质心能量下使用Z/gamma*->mu+mu- + X通道。这也是Z/gamma* 横向动量分布的第一次测量,它在进入探测器的粒子水平上呈现结果,最大限度地减少了对理论模型的依赖。由于Z/gamma* 在与入射光束横切的平面中的任何动量都必须被一些反冲系统所平衡,这主要是初始状态下QCD辐射的结果,因此这个变量是对潜在过程的一个很好的探测。QCD计算和电流事件发生器的预测测试表明,它们在描述数据方面取得了不同的成功。使用这种测量作为理论预测的输入将允许更好地描述强子对撞机数据,因此它将增加实验对罕见信号的灵敏度。

英文摘要:

We present a new measurement of the Z/gamma* transverse momentum distribution in the range 0 - 330GeV, in proton-antiproton collisions at sqrt{s}=1.96 TeV. The measurement uses 0.97 fb-1 of integrated luminosity recorded by the D0 experiment and is the first using the Z/gamma*->mu+mu- + X channel at this center-of-mass energy. This is also the first measurement of the Z/gamma* transverse momentum distribution that presents the result at the level of particles entering the detector, minimizing dependence on theoretical models. As any momentum of the Z/gamma* in the plane transverse to the incoming beams must be balanced by some recoiling system, primarily the result of QCD radiation in the initial state, this variable is an excellent probe of the underlying process. Tests of the predictions of QCD calculations and current event generators show they have varied success in describing the data. Using this measurement as an input to theoretical predictions will allow for a better description of hadron collider data and hence it will increase experimental sensitivity to rare signals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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