Search for displaced vertices of oppositely charged leptons from decays of long-lived particles in pp collisions at TeV with the ATLAS detector
A search for long-lived particles decaying into an oppositely charged lepton pair, μμ, ee, or eμ, is presented using 32.8 fb-1 of pp collision data collected at s√=13 TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary pp interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The detection efficiencies for generic resonances with lifetimes (cτ) of 100-1000 mm decaying into a dilepton pair with masses between 0.1-1.0 TeV are presented as a function of pT and decay radius of the resonances to allow the extraction of upper limits on the cross sections for theoretical models. The result is also interpreted in a supersymmetric model in which the lightest neutralino, produced via squark-antisquark production, decays into ℓ+ℓ -ν (ℓ,ℓ =e, μ) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50-500 GeV and mean proper lifetimes corresponding to cτ values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, cτ values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Harvard Univ., Cambridge, MA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of Oregon, Eugene, OR (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; SC0007881; AC02-76SF00515; SC0020244
- OSTI ID:
- 1577011
- Alternate ID(s):
- OSTI ID: 1582637; OSTI ID: 1633970; OSTI ID: 1706117; OSTI ID: 1763051
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 801 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
Similar Records
Searches for -parity-violating supersymmetry in collisions at in final states with 0–4 leptons
Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum in collisions with the ATLAS detector