Abstract
An important tool for interpreting LHC searches for new physics are simplified models. They are characterized by a small number of parameters and thus often rely on a simplified description of particle production and decay dynamics. Considering the production of squarks of the first two generations we compare the interpretation of current LHC searches for hadronic jets plus missing energy signatures within simplified models with the interpretation within a complete supersymmetric model. Although we find sizable differences in the signal efficiencies, in particular for large supersymmetric particle masses, the differences between the mass limits derived from a simplified model and from the complete supersymmetric model are moderate given the current LHC sensitivity. We conclude that simplified models provide a reliable tool to interpret the current hadronic jets plus missing energy searches at the LHC in a more model-independent way.
Highlights
In this study we investigated the validity of a simplified model description of squark production at the LHC
Concentrating on the T2 topology, pp → q(∗)q(∗) → qqχ01χ01, we examined the effect of a varying gluino mass and of varying dominant production channels
We found that the often used limiting case of a simplified model with a decoupled gluino is a priori not a good description unless mg 10 mq
Summary
While varying the ratio mg/mq, we kept the total production cross section of squarks and gluinos, denoted by σ{gq}, fixed The production of first generation squark pairs, q1(∗)q1(∗), is the dominant production channel over a large range of mg/mq. For large mg/mq its contribution is suppressed through the gluino mass appearing in the t-channel propagator, the relative contributions stays dominant up to mg 7mq (for σ{gq} 1000 fb) and above mg/mq = 10 (for σ{gq} 10 fb). Enhanced through a higher parton luminosity, the relative contribution of qLqR decreases rapidly with increasing mg/mq This is because its cross section is suppressed by 1/mg compared to qLqL and qRqR in the limit of large mg. The subcontributions to second generation squark pair production are completely dominated by qLqL∗ and qRqR∗. These, in turn, yield different event kinematics and in principle, different signal efficiencies for the experimental searches
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