Abstract
Stringent limits are set on the long-lived lepton-like sector of the phenomenological minimal supersymmetric standard model (pMSSM) and the anomaly-mediated supersymmetry breaking (AMSB) model. The limits are derived from the results presented in a recent search for long-lived charged particles in proton–proton collisions, based on data collected by the CMS detector at a centre-of-mass energy of 8 TeV at the Large Hadron Collider. In the pMSSM parameter sub-space considered, 95.9 % of the points predicting charginos with a lifetime of at least 10 ns are excluded. These constraints on the pMSSM are the first obtained at the LHC. Charginos with a lifetime greater than 100 ns and masses up to about 800 GeV in the AMSB model are also excluded. The method described can also be used to set constraints on other models.
Highlights
We present new constraints on long-lived chargino production in the phenomenological minimal supersymmetric standard model [1] and on the anomalymediated supersymmetry breaking (AMSB) model [2,3,4]
The results of the CMS search for long-lived charged particles have been analysed to set constraints on the phenomenological minimal supersymmetric standard model and on the anomaly-mediated SUSY breaking model (AMSB), both of which predict the existence of longlived massive particles in certain regions of their parameter space
A novel technique for estimating the signal acceptance with an accuracy of 10 % is presented. This technique only uses generator-level information, while the integrated luminosity, the expected standard model background yields, and the corresponding uncertainties are taken from a previous CMS search [12]
Summary
We present new constraints on long-lived chargino production in the phenomenological minimal supersymmetric standard model (pMSSM) [1] and on the anomalymediated supersymmetry breaking (AMSB) model [2,3,4]. Long-lived charged particles are predicted by various extensions of the standard model (SM) [5,6,7], such as supersymmetry (SUSY) [8] and theories with extra dimensions [9,10] If such particles have a mass lighter than a few TeV they could be produced by the CERN LHC. The results of the acceptance calculations have been tabulated and made publicly available [13] This technique, which allows the signal acceptance for a model with long-lived particles to be computed using the kinematic properties of the particles at their production point, may in the future be used by others to evaluate constraints on other extensions of the SM without use of the CMS software
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