Les Houches
2023 Session
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2017:groups:np:llpsm
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Table of Contents
Simplified models for long-lived particles
People interested: Nishita Desai, Stefania Gori, Andreas Goudelis, Sabine Kraml, Andre Lessa, Matthew McCullough, Dipan Sengupta, Benjamin Fuks, Eric Conte, Amit Chakraborty, Abhishek Iyer, Daniele Barducci, José Zurita, Jose Miguel No
Discussions:
- Friday (June 16) 10.00-12.00, Library
- Friday (June 16) 14.30-16.00, Auditorium
Topics:
Difficulties of recasting LLP searches
- See references below.
- How do detector simulations deal with LLPs?
- How much error from ignoring the magnetic field for recasting?
- Track efficiency for reconstructing displaced vertices?
- Simplified recasting? Efficiencies as a function of (few) relevant kinematical variables
References:
- Simplified Models for Exotic BSM Searches. Jan Heisig, Andre Lessa, Loic Quertenmont, https://arxiv.org/abs/1509.00473
- Long-Lived Staus and Displaced Leptons at the LHC. Jared A. Evans, Jessie Shelton, https://arxiv.org/abs/1601.01326
- Prompt Signals and Displaced Vertices in Sparticle Searches for Next-to-Minimal Gauge Mediated Supersymmetric Models. B. C. Allanach, Marcin Badziak, Giovanna Cottin, Nishita Desai, Cyril Hugonie, Robert Ziegler, https://arxiv.org/abs/1606.03099
Simplified models definitions
Three main signatures: long-lived charged track (long-lived charged particle), disappearing track or kink track (short-lived charged particle) and displaced vertices (short-lived neutral particle). The long-lived neutral gives standard missing energy signature.
- MadGraph implementations:
- Parameterisation of results: mass-vs-mass plane, mass-vs-lifetime, multi-dimensional grids, …
- Complementarity: Overlap of search strategies as lifetime changes
- Inclusive simplified models: only the LLP branch topology and decay is relevant?
Efficiencies
- Computing efficiencies as a function of the LLP kinematics and lifetime
- Efficiencies for R-hadrons
- Efficiencies for displaced vertices/kinks
- Demonstrate usefulness to motivate experimentalists to provide efficiencies
Efficiencies wishlist
- Displaced vertices: e, mu eff(d0, pT); jets eff(pT, ctau)
- Heavy charged particles: eff(pT, beta, eta)
- LL charged particles: eff(pT, beta, eta, ctau)
Q: What is the dependence on isolation? Do we need efficiencies for different isolation criteria?
Triggering
- See Tuesday morning talks at April LLP workshop at CERN
Cross talks
- Higgs group is interested in exotic decays into LLPs
Current Experimental Analyses
Note: Many ATLAS 13 TeV analyses notes inaccessible without CERN credentials
CMS summary of the searches https://indico.cern.ch/event/550030/contributions/2417789/attachments/1432466/2201005/Antonelli_Aspen2017_CMSLLP.pdf
| Experiment | Energy | Type | Analysis |
|---|---|---|---|
| ATLAS | 13 TeV | DV | Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in 13 TeV pp collisions with the ATLAS detector http://inspirehep.net/record/1589909 |
| ATLAS | 8 TeV | DT | Search for charginos nearly mass-degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √s = 8 TeV with the ATLAS detector http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-01/ |
| ATLAS | 8 TeV | Diss. Trk | Search for massive, long-lived particles using multitrack displaced vertices or displaced lepton pairs in pp collisions at sqrt(s)=8 TeV with the ATLAS detector https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-02/ |
| ATLAS | 8 TeV | Tracks | Search for heavy long-lived multi-charged particles in pp collisions at sqrt(s) = 8 TeV using the ATLAS detector https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-20/ |
| ATLAS | 8 TeV | DV | Search for long-lived, weakly-interacting particles that decay to displaced hadronic jets in proton-proton collisions at √s=8 TeV with the ATLAS detector https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-12/ |
| ATLAS | 8 TeV | Disp. jet | Search for pair-produced long-lived neutral particles decaying in the ATLAS hadronic calorimeter in pp collisions at √s = 8 TeV https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2012-28/ |
| ATLAS | 8 TeV | Disp. leptons | Search for long-lived neutral particles decaying into lepton jets in proton-proton collisions at √s = 8 TeV with the ATLAS detector https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-22/ |
| ATLAS | 8 TeV | Tracks | Searches for heavy long-lived particles with the ATLAS detector in proton-proton collisions at sqrt(s) = 8 TeV https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-22/ |
| ATLAS | 8 TeV | R-had | Search for long-lived stopped R-hadrons decaying out-of-time with pp collisions using the ATLAS detector https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2013-03/ |
| CMS | 13 TeV | Disp. jets | Inclusive search for new particles decaying to displaced jets at √s = 13 TeV http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-16-003/index.html |
| CMS | 13 TeV | Stopped | Search for stopped long-lived particles produced in pp collisions at √s= 13 TeV http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-16-004/index.html |
| CMS | 13 TeV | Tracks | Searches for Long-lived Charged Particles in Proton-Proton Collisions at √s= 13 TeVhttp://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-15-010/index.html |
| CMS | 13 TeV | Disp. leptons | Search for displaced leptons in the e-μ channel http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-16-022/index.html |
| CMS | 8 TeV | Disp. leptons | Search for Displaced SUSY in Dilepton Final States http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/B2G-12-024/index.html |
| CMS | 8 TeV | Disp. photons | Search for displaced photons using conversions at 8 TeV http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-14-017/index.html |
| CMS | 8 TeV | Disp. photon + MET | Search for long-lived neutral particles in the final state of delayed photons and missing energy in proton-proton collisions at √s = 8 TeV http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-12-035/index.html |
| CMS | 8 TeV | Disp. muons | Search for long-lived particles that decay into final states containing two muons, reconstructed using only the CMS muon chambers http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-14-012/index.html |
| CMS | 8 TeV | DV | Search for long-lived particles decaying to final states that include dileptons http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-12-037/index.html |
| CMS | 8 TeV | Stopped | Search for decays of stopped long-lived particles produced in proton-proton collisions at √s = 8 TeV http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-12-036/index.html |
| CMS | 7 & 8 TeV | Tracks | Searches for Long-lived Charged Particles http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-12-026/index.html |
| CMS | 8 TeV | Disp. jets | Search for long-lived neutral particles decaying to dijets http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-12-038/index.html |
2017/groups/np/llpsm.1497708547.txt.gz · Last modified: 2017/06/17 16:09 by jose_miguel.no
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