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arXiv 1202.6674hep-ph
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线性膨胀几何的引力子唯象

Graviton Phenomenology of Linear Dilaton Geometries

Masha Baryakhtar

摘要:

在TeV小弦论(LSTs)中,以线性变化的弦为背景的五维几何作为引力场,通过额外的维度提供了层次问题的解决方案。独特的卡鲁扎-克莱因引力子谱有一个质量间隙的数量级的介子斜率其次是一个紧密间隔的离散状态。我们详细研究在这种情况下的引力子现象,允许的引力子斜率从兆电子伏的TeV规模。当强子斜率足够大,使得单个的KK共振可以在LHC上被解析时,其中的几个可以同时被发现,并且允许线性的强子几何被唯一地识别。对于小得多的介子斜率值,LHC的签名变得类似于5-d ADD的情况下,而放松天体物理和实验的限制。由于质量间隙的存在,KK模在壳层上产生,并在LHC探测器内衰减,从而在大的不变质量下修改了双光子和双轻子谱。最后,我们对低曲率RS几何进行了类似的分析。我们目前的实验极限和计算的最终达到14 TeV的大型强子对撞机为所有上述方案。

英文摘要:

Five-dimensional geometries with a linearly varying dilaton background arise as gravity duals of TeV Little String Theories (LSTs) and provide a solution of the hierarchy problem through extra dimensions. The unique Kaluza-Klein graviton spectrum has a mass gap on the order of the dilaton slope followed by a closely spaced discretum of states. We study in detail the graviton phenomenology in this scenario, allowing the dilaton slope to vary from the MeV to the TeV scale. When the dilaton slope is large enough so that individual KK resonances can be resolved at the LHC, several of them can be discovered simultaneously and allow for the linear dilaton geometry to be uniquely identified. For much smaller values of the dilaton slope, the LHC signatures become similar to the 5-d ADD scenario while relaxing the astrophysical and experimental constraints. Due to the mass gap, the KK modes are produced on-shell and decay inside the LHC detector, modifying the diphoton and dilepton spectra at large invariant mass. Finally, we perform a similar analysis for the low curvature RS geometry. We present experimental limits and calculate the ultimate reach of a 14 TeV LHC for all the above scenarios.

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