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arXiv 0801.1651hep-phastro-phhep-ex
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在CMSSM和无GUT的超光速突破方案中发现超粒子的潜力

Sparticle Discovery Potentials in the CMSSM and GUT-less Supersymmetry-Breaking Scenarios

John Ellis, Keith A. Olive, Pearl Sandick

摘要:

我们考虑LHC和线性e^+e^-对撞机(LC)在MSSM的变体中发现超对称粒子的潜力,其中软超对称破缺质量参数被限制为在GUT尺度(CMSSM)或在某些较低尺度M_{in}(无GUT模型)下的普适性,就像在某些海市蜃楼统一的场景中可能发生的那样。尽管LHC应该能够发现沿着所有CMSSM共湮灭带的方子和/或胶子,其中残余中性子LSP密度位于有利于冷暗物质的范围内,但许多没有GUT的模型可能逃脱LHC的检测。特别是,如果M_{in} < 10^{11} GeV,如果残余物的密度落在有利的范围内,LHC就不会探测到超粒子。对于LHC中任何一个已知的超对称性发现,在这样的无GUT模型中,最轻的中性伴子质量以及LC中产生超粒子对的阈值随着M_{in}的减小而增加,CMSSM为测量LC中的超粒子提供了最好的前景。例如,如果大型强子对撞机发现了具有1 fb^{-1}数据的超微粒子,那么在CMSSM中,600 GeV的质心能量就足以让LC产生中性伴子对,如果它们提供冷的暗物质的话,而在一般的无大统一理论模型中可能需要超过1 TeV的能量。如果LHC需要10 fb^{-1}才能发现超对称性,那么CMSSM中所需的能量将增加到800 GeV,而无GUT模型中所需的能量将增加到1.4 TeV。

英文摘要:

We consider the potentials of the LHC and a linear e^+e^- collider (LC) for discovering supersymmetric particles in variants of the MSSM with soft supersymmetry-breaking mass parameters constrained to be universal at the GUT scale (CMSSM) or at some lower scale M_{in} (GUT-less models), as may occur in some scenarios with mirage unification. Whereas the LHC should be able to discover squarks and/or gluinos along all the CMSSM coannihilation strip where the relic neutralino LSP density lies within the range favoured for cold dark matter, many GUT-less models could escape LHC detection. In particular, if M_{in} < 10^{11} GeV, the LHC would not detect sparticles if the relic density lies within the favoured range. For any given discovery of supersymmetry at the LHC, in such GUT-less models the lightest neutralino mass and hence the threshold for sparticle pair production at a LC increases as M_{in} decreases, and the CMSSM offers the best prospects for measuring sparticles at a LC. For example, if the LHC discovers sparticles with 1 fb^{-1} of data, within the CMSSM a centre-of-mass energy of 600 GeV would suffice for a LC to to produce pairs of neutralinos, if they provide the cold dark matter, whereas over 1 TeV might be required in a general GUT-less model. These required energies increase to 800 GeV in the CMSSM and 1.4 TeV in GUT-less models if the LHC requires 10 fb^{-1} to discover supersymmetry.

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