Search for decays of stopped exotic long-lived particles produced in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search is presented for the decays of heavy exotic long-lived particles (LLPs) that are produced in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC and come to rest in the CMS detector. Their decays would be visible during periods of time well separated from proton-proton collisions. Two decay scenarios of stopped LLPs are explored: a hadronic decay detected in the calorimeter and a decay into muons detected in the muon system. The calorimeter (muon) search covers a period of sensitivity totaling 721 (744) hours in 38.6 (39.0) fb${}^{-1}$ of data collected by the CMS detector in 2015 and 2016. The results are interpreted in several scenarios that predict LLPs. Production cross section limits are set as a function of the mean proper lifetime and the mass of the LLPs, for lifetimes between 100 ns and 10 days. These are the most stringent limits to date on the mass of hadronically decaying stopped LLPs, and this is the first search at the LHC for stopped LLPs that decay to muons.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-16-004 (CMS Public Pages)

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• Echoes of a Hidden Valley at Hadron Colliders
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Stable Massive Particles at Colliders
• Search for long-lived charged particles in proton-proton collisions at sqrt(s) = 13 TeV
• Search for heavy long-lived charged particles in pp collisions at sqrt(s) = 7 TeV
• Interactions of Coloured Heavy Stable Particles in Matter
• Search for decays of stopped long-lived particles produced in proton-proton collisions at sqrt(s) = 8 TeV
• Search for stopped long-lived particles produced in pp collisions at sqrt(s) = 7 TeV
• Search for stopped gluinos from p-pbar collisions at sqrt(s)=1.96 TeV
• Parametrization of the Cosmic Muon Flux for the Generator CMSCGEN
• Long-Lived stop at the LHC with or without R-parity

Cited by in corpus (22)

• Long-lived particles at the LHC: catching them in time
• The experimental status of direct searches for exotic physics beyond the standard model at the Large Hadron Collider
• A deep neural network to search for new long-lived particles decaying to jets
• Search for long-lived particles using nonprompt jets and missing transverse momentum with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• SO(10) paths to dark matter
• Enhancing Sensitivities to Long-lived Particles with High Granularity Calorimeters at the LHC
• Search for long-lived particles decaying to leptons with large impact parameter in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Proton decay at 1-loop
• Long-Lived Light Mediators from Higgs boson Decay at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh
• The quirk signal at FASER and FASER 2
• Status of searches for electroweak-scale supersymmetry after LHC Run 2
• Prospects for discovering supersymmetric long-lived particles with MoEDAL
• A search for the decays of stopped long-lived particles at $\sqrt{s}=13$ TeV with the ATLAS detector
• Jet Timing
• Search for inelastic dark matter in events with two displaced muons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• On long-lived electroweak-singlet coloured scalars
• Long-lived charged particles and multi-lepton signatures from neutrino mass models
• Searches for Dark Matter Particles at the LHC
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
• Dark Unification: a UV-complete Theory of Asymmetric Dark Matter
• TeV Window to Grand Unification: Higgs's Light Color Triplet Partner
• Detecting long-lived particles trapped in detector material at the LHC