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Interpreting a CMS excess in lljj+ missing -transverse-momentum with the golden cascade of the minimal supersymmetric standard model


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Authors

Kvellestad, A 
Raklev, A 

Abstract

The CMS experiment recently reported an excess consistent with an invariant mass edge in opposite-sign same flavor (OSSF) leptons, when produced in conjunction with at least two jets and missing transverse momentum. We provide an interpretation of the edge in terms of (anti-)squark pair production followed by the `golden cascade' decay for one of the squarks: q~χ~20ql~lqχ~10qll in the minimal supersymmetric standard model (MSSM). A simplified model involving binos, winos, an on-shell slepton, and the first two generations of squarks fits the event rate and the invariant mass edge. We check consistency with a recent ATLAS search in a similar region, finding that much of the good-fit parameter space is still allowed at the 95% confidence level (CL). However, a combination of other LHC searches, notably two-lepton stop pair searches and jets plus pTmiss, rule out all of the remaining parameter space at the 95% CL.

Description

This is the author accepted manuscript. The final version is available from APS via http://dx.doi.org/10.1103/PhysRevD.91.115022

Keywords

hep-ph, hep-ph, hep-ex

Journal Title

Physical Review D - Particles, Fields, Gravitation and Cosmology

Conference Name

Journal ISSN

1550-7998
1550-2368

Volume Title

91

Publisher

American Physical Society (APS)
Sponsorship
Science and Technology Facilities Council (ST/J000434/1)
Science and Technology Facilities Council (ST/L000385/1)
This work has been partially supported by STFC grant ST/L000385/1. We thank the Cambridge SUSY Working Group and T. Stefaniak for stimulating discussions. Some of the CPU intensive parts of this work was performed on the Abel Cluster, owned by the University of Oslo and the Norwegian metacenter for High Performance Computing (NOTUR), and operated by the Research Computing Services group at USIT, the University of Oslo IT-department. The computing time was given by NOTUR allocation NN9284K, financed through the Research Council of Norway.