Indirect collider signals for extra dimensions
Indirect collider signals for extra dimensions
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DOI：
10.1103/physrevlett.82.4765
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发表时间：
1998-11
影响因子：
8.6
通讯作者：
J. Hewett
中科院分区：
文献类型：
--
作者：
J. Hewett
最近有人提出，量子引力在接近弱标度时可能变得很强，这有几个可检验的结果。除了通过引力实验探索与这些理论相关的新的大（亚毫米）额外维度之外，人们还可以搜索这些模型中预测的大质量引力子的卡鲁扎克莱因塔，它可以与标准模型的场相互作用。在这里，我们研究的间接影响，这些大质量的引力子被交换在费米子对生产在e{sup +}e{sup {minus}}湮灭和Drell-Yan生产在强子对撞机。在后一种情况下，我们研究了这个理论的一个新的特点，这是胶子胶子启动过程的轻子对生产的贡献。我们发现，这些过程提供了强大的界限，高达几个TeV，在字符串规模基本上是独立的额外维度的数量。此外，我们分析了自旋为2的引力子交换的费米子对产生的角分布，并证明它们为低尺度量子引力提供了一个吸烟枪信号，这是其他新物理场景无法模仿的。
A recent suggestion that quantum gravity may become strong near the weak scale has several testable consequences. In addition to probing for the new large (submillimeter) extra dimensions associated with these theories via gravitational experiments, one could search for the Kaluza Klein towers of massive gravitons which are predicted in these models and which can interact with the fields of the Standard Model. Here we examine the indirect effects of these massive gravitons being exchanged in fermion pair production in e{sup +}e{sup {minus}} annihilation and Drell-Yan production at hadron colliders. In the latter case, we examine a novel feature of this theory, which is the contribution of gluon gluon initiated processes to lepton pair production. We find that these processes provide strong bounds, up to several TeV, on the string scale which are essentially independent of the number of extra dimensions. In addition, we analyze the angular distributions for fermion pair production with spin-2 graviton exchanges and demonstrate that they provide a smoking gun signal for low-scale quantum gravity which cannot be mimicked by other new physics scenarios.