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arXiv 1012.3466hep-phhep-exhep-th
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在e^+e^-和γγ碰撞中寻找弦共振

Searching for string resonances in e^+e^- and γγcollisions

Luis A. Anchordoqui, Wan-Zhe Feng, Haim Goldberg, Xing Huang, Tomasz R. Taylor

摘要:

如果超弦理论的基本质量尺度低至几个TeV,那么振动弦的大质量模式(Regge激发)将在大型强子对撞机(LHC)中大量产生。我们讨论了在电子-正电子装置(CLIC)上,在e^+e^-和γγ碰撞中低质量超弦的互补信号。我们检查所有相关的四粒子振幅评估的质心能量附近的质量最轻的Regge激发,并提取相应的极项。所有四点振幅的雷奇极点,特别是共振的自旋含量,是完全独立于模型的,弦紧化的整个景观的普遍性质。我们证明了γγ \to e^+ e^-散射只通过自旋为2的Regge态进行。我们估计,对于这个特定的通道,弦尺度高达4 TeV,可以发现在11σ水平的第一个fb^{-1}的数据收集在质心能量\approx 5 TeV。我们还表明,对于e^+e^-湮灭成费米子-反费米子对,弦论预言自旋2和自旋1贡献的相对权重的精确值为1/3。这产生了一个具有明显的前后不对称性的双μ子角分布,这将有助于区分低质量弦和其他超出标准模型的情况。

英文摘要:

If the fundamental mass scale of superstring theory is as low as few TeVs, the massive modes of vibrating strings, Regge excitations, will be copiously produced at the Large Hadron Collider (LHC). We discuss the complementary signals of low mass superstrings at the proposed electron-positron facility (CLIC), in e^+e^- and γγcollisions. We examine all relevant four-particle amplitudes evaluated at the center of mass energies near the mass of lightest Regge excitations and extract the corresponding pole terms. The Regge poles of all four-point amplitudes, in particular the spin content of the resonances, are completely model independent, universal properties of the entire landscape of string compactifications. We show that γγ\to e^+ e^- scattering proceeds only through a spin-2 Regge state. We estimate that for this particular channel, string scales as high as 4 TeV can be discovered at the 11σlevel with the first fb^{-1} of data collected at a center-of-mass energy \approx 5 TeV. We also show that for e^+e^- annihilation into fermion-antifermion pairs, string theory predicts the precise value, equal 1/3, of the relative weight of spin 2 and spin 1 contributions. This yields a dimuon angular distribution with a pronounced forward-backward asymmetry, which will help distinguishing between low mass strings and other beyond the standard model scenarios.

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