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arXiv 0710.3100hep-phhep-th
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在Kaluza-Klein激发的产生阈值以下测试额外维度

Testing extra dimensions below the production threshold of Kaluza-Klein excitations

Edward E. Boos, Viacheslav E. Bunichev, Mikhail N. Smolyakov, Igor P. Volobuev

备注：
20 pages, 8 figures, LaTeX. Added figures, enlarged phenomenological part
发表信息：
Phys.Rev.D79:104013,2009
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摘要：

我们考虑一个稳定的RS 1模型的能量范围低于直接生产的KK状态。在此范围内，我们求出了重KK张量引力子与标量辐射子交换的有效拉格朗日量，并显式计算了相应的有效耦合常数。作为一个例子，Drell-Yan轻子对的产生在Tevatron和LHC在两种情况下进行了分析，当第一个KK共振太重而不能直接在对撞机上检测到，当第一个KK共振是可见的，但其他状态仍然太重。结果表明，在这两种情况下，从KK看不见的塔的贡献导致最终粒子分布的修改。特别地，对于第二种情况，在第一KK模式和其余KK塔之间发生非平凡的干扰。给出了Tevatron和LHC模型参数的预期95% CL限值。在附录中给出了各种新的重KK塔交换$2\to2$过程的截面和分布的有用公式，新公式包含末态费米子和玻色子的非零粒子质量。计算公式和数值结果是通过CompHEP程序得到的，其中实现了所有新的有效相互作用，为相应事件的模拟和更详细的分析提供了工具。

英文摘要：

We consider a stabilized RS1 model in the energy range below the direct production of KK states. In this range we work out the effective Lagrangian due to exchange of heavy KK tensor graviton and scalar radion states and compute explicitly the corresponding effective coupling constants. As an example, the Drell-Yan lepton pair production at the Tevatron and the LHC is analyzed in two situations, when the first KK resonance is too heavy to be directly detected at the colliders, and when the first KK resonance is visible but other states are still too heavy. It is shown that in both cases the contribution from the KK invisible tower leads to a modification of final particles distributions. In particular, for the second case a nontrivial interference between the first KK mode and the rest KK tower takes place. Expected 95% CL limits for model parameters for the Tevatron and the LHC are given. In the Appendix useful formulas for the cross sections and distributions of various new $2\to2$ processes via heavy KK tower exchange are presented, the new formulas containing nonzero particle masses for final state fermions and bosons. The formulas and numerical results are obtained by means of the CompHEP code, in which all new effective interactions are implemented providing a tool for simulation of corresponding events and a more detailed analysis.

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