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arXiv 0904.3547hep-phhep-th
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弦猎人的LHC现象学

LHC Phenomenology for String Hunters

Luis A. Anchordoqui, Haim Goldberg, Dieter Lust, Satoshi Nawata, Stephan Stieberger, Tomasz R. Taylor

摘要:

我们考虑扩展的标准模型的基础上开放字符串结束的D-膜,规范玻色子由于字符串连接到堆栈的D-膜和手征物质由于字符串之间的拉伸相交的D-膜。假设弦的基本质量尺度在TeV范围内,理论是弱耦合的,我们讨论了在大型强子对撞机(LHC)弦物理的可能信号。在以前的工作中,直接通道激发Regge递归的部分子-部分子散射提供了杰出的新签名。目前的工作考虑偏离标准模型预期的4-费米子过程qq \to qq和qq' \to qq',其中的弦共振的s-通道激发是缺席的。在这种情况下,我们发现卡鲁扎-克莱因递归在质量略小于弦尺度产生有效的4-费米子接触项,可以显着提高dijet R比高于其QCD值约0.6。同时观察到附近的共振结构在dijet质谱将提供一个“吸烟枪”的TeV尺度弦论。在这项工作中,我们还表明:(1)对于M_{string} <3.5 TeV,由pp \to Z ^0+喷流通道产生的各种拓扑结构的速率可能与标准模型的预测有很大的偏差,(2)Regge递归的相当大的截面可以允许在LHC在\sqrt{s} = 10 TeV和\int L dt ~ 100 pb^{-1}。

英文摘要:

We consider extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we discuss possible signals of string physics at the Large Hadron Collider (LHC). In previous works, direct channel excitations of Regge recurrences in parton-parton scattering supplied the outstanding new signature. The present work considers the deviation from standard model expectations for the 4-fermion processes qq\to qq and qq' \to qq', in which the s-channel excitation of string resonances is absent. In this case, we find that Kaluza-Klein recurrences at masses somewhat less than the string scale generate effective 4-fermion contact terms which can significantly enhance the dijet R ratio above its QCD value of about 0.6. The simultaneous observation of a nearby resonant structure in the dijet mass spectrum would provide a "smoking gun" for TeV scale string theory. In this work, we also show that (1) for M_{string}<3.5 TeV, the rates for various topologies arising from the pp \to Z^0 + jet channel could deviate significantly from standard model predictions and (2) that the sizeable cross sections for Regge recurrences can allow a 6σdiscovery for string scales as large as 3 TeV after about 1 year of LHC operation at \sqrt{s} =10 TeV and \int L dt ~ 100 pb^{-1}.

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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