Stashing the stops in multijet events at the LHC

Sara Diglio, Lorenzo Feligioni, and Gilbert Moultaka
Phys. Rev. D 96, 055032 – Published 25 September 2017

Abstract

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 mostly 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 been so far barely 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 107101 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 from stop pair production and decays, estimate the corresponding proton–proton cross sections at s=14TeV and discuss signal versus background issues.

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  • Received 5 January 2017

DOI:https://doi.org/10.1103/PhysRevD.96.055032

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Sara Diglio1,*, Lorenzo Feligioni1,†, and Gilbert Moultaka2,‡

  • 1Centre de Physique des Particules de Marseille, Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
  • 2Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier 34095, F-France

  • *Present address: SUBATECH, IMT Atlantique, CNRS/IN2P3, Université de Nantes, Nantes 44307, France. diglio@subatech.in2p3.fr
  • lorenzo@cppm.in2p3.fr
  • Corresponding author. gilbert.moultaka@umontpellier.fr

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Issue

Vol. 96, Iss. 5 — 1 September 2017

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