Measurement of upsilon production in 7 TeV p p collisions at ATLAS
Measurement of upsilon production in 7 TeV p p collisions at ATLAS
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ATLAS 7 TeV pp 碰撞中 upsilon 产量的测量
DOI：
10.1103/physrevd.87.052004
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发表时间：
2013
影响因子：
5
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
利用大型强子对撞机的 ATLAS 探测器记录的 7 TeV 质心能量的碰撞，我们展示了介子产生截面的测量结果。介子是使用二介子衰变模式重建的。快速区间内的总生产横截面分别测量为、、、和，不确定性分为统计、系统和光度测量效应。此外，还给出了 、 和 的微分截面乘以dimuon 支化分数，作为横向动量和速度的函数。这些横截面是在假设非极化生产的情况下获得的。如果产生的偏振是完全横向或纵向的，在螺旋框架中没有方位角依赖性，则横截面可能会大约变化。如果考虑非平凡的方位角依赖性，则积分横截面可能会显着增强 2 倍或更多。我们将我们的结果与介子产生的几个理论模型进行比较，发现没有一个模型能够在该数据集可访问的整个横向动量范围内准确描述我们的数据。
Usingofcollisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections ofmesons.mesons are reconstructed using the dimuon decay mode. Total production cross sections forand in the rapidity intervalare measured to be,,, and, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for,, andas a function oftransverse momentumand rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models ofmeson production, finding that none provide an accurate description of our data over the full range oftransverse momenta accessible with this data set.