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arXiv 0704.3403hep-phhep-th
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大容量弦紧化的S粒子谱和LHC签名

Sparticle Spectra and LHC Signatures for Large Volume String Compactifications

J. P. Conlon, C. H. Kom, K. Suruliz, B. C. Allanach, F. Quevedo

摘要:

我们研究了基本尺度为10^{11} GeV的大体积弦模型的超对称粒子谱和LHC对撞机观测值,这些模型产生于膜和通量的模固定弦紧化。手性所需的膜世界体积上的磁通量的存在,扰动了软项,使其偏离了先前在稀通量极限下计算的软项。我们使用高尺度规范耦合的差异来估计这种扰动的大小,并通过产生许多随机谱与软项扰动周围的稀通量限制的磁通量的潜在影响进行研究。即使在高尺度软项中有40%的变化,低能谱也具有清晰和预测的形式。由此产生的光谱与SPS 1a斜率上产生的光谱大致相似,但更简并。在最小版本中,模型预测的高吉诺质量比为M_1:M_2:M_3=(1.5 - 2):2:6,不同于mSUGRA和海市蜃楼的中介作用。在标量中,squarks往往比可比的mSUGRA模型更轻,sleptons更重。我们生成了10 fb^{-1}的LHC随机光谱样本数据,以研究对撞机现象可能发生的范围。我们执行一个详细的质量重建的一个例子大体积弦模型光谱。100 fb^{-1}的积分亮度足以将模型与mSUGRA区分开来,并且可以精确地重建超粒子光谱的各个方面。

英文摘要:

We study the supersymmetric particle spectra and LHC collider observables for the large-volume string models with a fundamental scale of 10^{11} GeV that arise in moduli-fixed string compactifications with branes and fluxes. The presence of magnetic fluxes on the brane world volume, required for chirality, perturb the soft terms away from those previously computed in the dilute-flux limit. We use the difference in high-scale gauge couplings to estimate the magnitude of this perturbation and study the potential effects of the magnetic fluxes by generating many random spectra with the soft terms perturbed around the dilute flux limit. Even with a 40% variation in the high-scale soft terms the low-energy spectra take a clear and predictive form. The resulting spectra are broadly similar to those arising on the SPS1a slope, but more degenerate. In their minimal version the models predict the ratios of gaugino masses to be M_1 : M_2 : M_3=(1.5 - 2) : 2 : 6, different to both mSUGRA and mirage mediation. Among the scalars, the squarks tend to be lighter and the sleptons heavier than for comparable mSUGRA models. We generate 10 fb^{-1} of sample LHC data for the random spectra in order to study the range of collider phenomenology that can occur. We perform a detailed mass reconstruction on one example large-volume string model spectrum. 100 fb^{-1} of integrated luminosity is sufficient to discriminate the model from mSUGRA and aspects of the sparticle spectrum can be accurately reconstructed.

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