在LHC的多喷嘴事件中隐藏停靠点
Stashing the stops in multijet events at the LHC
摘要：
虽然光阻的存在越来越不受R宇称守恒场景的实验限制，但超对称的自然性仍然可以安全地隐藏在非零R宇称违反耦合的存在所预测的更具挑战性的最终状态中。尽管在大型强子对撞机上广泛地寻找R宇称违反的签名，这些搜索总是假设100\%的分支比的超对称粒子直接衰变到标准模型的。在本文中，我们仔细研究放松这一假设的影响，集中在一个有动机的情况下，最轻的停止比电荷伴子和中性伴子重。考虑一类R-宇称重子数违反耦合，我们表明，一般的理由，虽然直接衰变到标准模型粒子的停止是占主导地位的这些耦合的大值，较小的值引起，而不是占主导地位的过多的较长的衰变链和丰富的最终状态，尚未在大型强子对撞机分析，从而削弱了目前实验性停止质量限制的影响。我们描述的情况下，R-宇称重子数违反耦合在$10^{-7} - 10^{-1}$范围内，在两个不同的基准点的情况下，在模型独立设置的低能量唯象最小超对称标准模型。我们确定了不同的相关实验签名，估计相应的质子-质子截面在$\sqrt{s}=14$ TeV和讨论信号与背景的问题。
英文摘要：
While the presence of a light stop is increasingly disfavored by the experimental limits set on R-parity conserving scenarios, the naturalness of supersymmetry could still be safely concealed in the more challenging final states predicted by the existence of non-null R-parity violating couplings. Although R-parity violating signatures are extensively looked for at the Large Hadron Collider, these searches always assume 100\% branching ratios for the direct decays of supersymmetric particles into Standard Model ones. In this paper we scrutinize the implications of relaxing this assumption by focusing on one motivated scenario where the lightest stop is heavier than a chargino and a neutralino. Considering a class of R-parity baryon number violating couplings, we show on general grounds that while the direct decay of the stop into Standard Model particles is dominant for large values of these couplings, smaller values give rise, instead, to the dominance of a plethora of longer decay chains and richer final states that have not yet been analyzed at the LHC, thus weakening the impact of the present experimental stop mass limits. We characterize the case for R-parity baryon number violating couplings in the $10^{-7} - 10^{-1}$ range, in two different benchmark points scenarios within the model-independent setting of the low-energy phenomenological Minimal Supersymmetric Standard Model. We identify the different relevant experimental signatures, estimate the corresponding proton--proton cross sections at $\sqrt{s}=14$ TeV and discuss signal versus background issues.
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