Abstract
Several scenarios beyond the Standard Model predict long-lived particles resulting in a wide variety of detector signatures depending on the nature of the particles and the decay lengths. Signals from long-lived particles are investigated by the ATLAS and CMS experiments exploiting different signatures, ranging from abnormal energy losses, to appearing or disappearing tracks, displaced vertices, lepton-jet signatures, long time-of-flight or late calorimetric energy deposits. This contribution summarizes the most recent results of the searches performed at the Large Hadron Collider (LHC) with the ATLAS and CMS detectors during the Run-1 data taking campaign. No evidence of any new physics is observed so far in any analysis, and the results are used to set stringent constraint on supersymmetric or hidden sector models.
Highlights
A variety of proposed theories beyond the Standard Model (BSM), such as supersymmetry (SUSY), theories with extra dimensions, scenarios with a hidden valley, and various others, can lead to the production of unusual signatures in detectors at the Large Hadron Collider (LHC). These may include: long-lived particles (LLP), meta-stable particles and collimated jets of displaced leptons or hadrons. Exploring these signatures is being of great interest today since they could give a possibility to evade the current constraints of SM extensions, tightened by the experimental evidence of the absence of any signal beyond Standard Model in the generic searches performed at LHC
The Higgs boson measured at 125 GeV [13, 14] motivates heavy scalar scenarios where the squarks and sleptons are rendered heavy while gauginos may still be light enough to be produced at the LHC energies
The CMS experiment performed a search for displaced lepton sensitive to a wide class of models that contain long-lived particles decaying to leptons
Summary
A variety of proposed theories beyond the Standard Model (BSM), such as supersymmetry (SUSY), theories with extra dimensions, scenarios with a hidden valley, and various others, can lead to the production of unusual signatures in detectors at the Large Hadron Collider (LHC) These may include: long-lived particles (LLP), meta-stable particles and collimated jets of displaced leptons or hadrons. The ATLAS [1] and CMS [2] collaborations explored different experimental signatures and theoretical models using data collected from proton-proton collisions at LHC This contribution gives an overview of some of the results o√f the searches performed on the whole LHC data taken at s = 7 and 8 TeV. Dark and hidden sectors inspired long-lived particles searches in ATLAS [11, 12], and CMS [8, 9]
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