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arXiv 0712.2156hep-ph
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在LHC探测双线性R宇称违反超引力

Probing bilinear R-parity violating supergravity at the LHC

F. de Campos, O. J. P. Eboli, M. B. Magro, W. Porod, D. Restrepo, M. Hirsch, J. W. F. Valle

摘要:

我们研究了双线性R宇称破缺超引力的对撞机现象,这是解释目前中微子振荡数据的超对称中微子质量的最简单有效模型。在欧洲核子研究中心的大型强子对撞机上,质心能量将足够高,可以通过寻找标准模型(SM)粒子的超伴子来直接探测这些模型。我们分析了R-宇称违反规范的超对称搜索的影响-也就是说,我们研究如何通过双线性R-宇称违反相互作用的最轻的超对称粒子(LSP)的衰变降低了平均预期的反应丢失的动量,并显示这是如何减少在超对称搜索的“通常”渠道的范围。然而,R-宇称破坏相互作用导致包含孤立的同号双轻子和三轻子的末态的增强,补偿了完全包含通道中的到达损失。我们展示了如何搜索与LSP衰变相关的位移顶点,大大增加了超重力参数空间的覆盖范围,给出了相应的达到两个参考光度为10和100 FB $^{-1}$,并与R-宇称守恒最小超重力模型。

英文摘要:

We study the collider phenomenology of bilinear R-parity violating supergravity, the simplest effective model for supersymmetric neutrino masses accounting for the current neutrino oscillation data. At the CERN Large Hadron Collider the center-of-mass energy will be high enough to probe directly these models through the search for the superpartners of the Standard Model (SM) particles. We analyze the impact of R-parity violation on the canonical supersymmetry searches - that is, we examine how the decay of the lightest supersymmetric particle (LSP) via bilinear R-parity violating interactions degrades the average expected missing momentum of the reactions and show how this diminishes the reach in the 'usual' channels for supersymmetry searches. However, the R-parity violating interactions lead to an enhancement of the final states containing isolated same-sign di-leptons and trileptons, compensating the reach loss in the fully inclusive channel. We show how the searches for displaced vertices associated to LSP decay substantially increase the coverage in supergravity parameter space, giving the corresponding reaches for two reference luminosities of 10 and 100 fb$^{-1}$ and compare with those of the R-parity conserving minimal supergravity model.

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