2017:groups:np:llpsm
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2017:groups:np:llpsm [2017/06/21 11:20] gabriel.facini |
2017:groups:np:llpsm [2018/01/31 10:33] (current) giovanna.cottin |
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| - | ====== Simplified models for long-lived particles ====== | + | ====== Recasting and 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, Biplob Bhattacherjee, Shankha Banerjee, Haiying Cai, Sezen Sekmen, Gabriel Facini | + | 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, Biplob Bhattacherjee, Shankha Banerjee, Haiying Cai, Sezen Sekmen, Gabriel Facini, Andy Buckley, Giovanna Cottin |
| - | Discussions: | + | We now have a mailing list: leshouches-llp-recast AT cern.ch |
| - | * Friday (June 16) 10.00-12.00, Library | + | |
| - | * Friday (June 16) 14.30-16.00, Auditorium | + | |
| Topics: | Topics: | ||
| Line 15: | Line 13: | ||
| * Track efficiency for reconstructing displaced vertices? | * Track efficiency for reconstructing displaced vertices? | ||
| * Simplified recasting? Efficiencies as a function of (few) relevant kinematical variables | * Simplified recasting? Efficiencies as a function of (few) relevant kinematical variables | ||
| + | * How to estimate trigger efficiency for signal different from benchmark (a.k.a. are we throwing away the signal before starting?) | ||
| - | References: | ||
| - | * **Simplified Models for Exotic BSM Searches**. Jan Heisig, Andre Lessa, Loic Quertenmont, [[https://arxiv.org/abs/1509.00473]] | + | ===== Task List ===== |
| - | * **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]] | + | First task is to implement and validate a few analyses |
| + | |||
| + | ^ ** Search ** | ** People ** | | ||
| + | ^ Heavy Charged particles | Shankha Banerjee, Biplob Bhattacherjee, Abhishek Iyer, Dipan Sengupta | | ||
| + | ^ Disappearing tracks | José Zurita | | ||
| + | ^ Displaced vertices | Andre Lessa, Jan Heisig | | ||
| + | ^ Displaced leptons / jets | Amit Chakraborty, Nishita Desai, Andre Lessa | | ||
| + | ^ R-hadrons | Jan Heisig (?) | | ||
| + | === What do we want from this exercise? === | ||
| + | * One document showing validation (or lack of it) for each category | ||
| + | * A list of models people are interested in re-interpreting these searches for. Is there anything that changes that cannot be smoothly interpolated? e.g. number of tracks? Anything else? | ||
| ===== Simplified models definitions ===== | ===== Simplified models definitions ===== | ||
| Line 55: | Line 63: | ||
| * Higgs group is interested in exotic decays into LLPs | * Higgs group is interested in exotic decays into LLPs | ||
| * Interplay with LHCb searches | * Interplay with LHCb searches | ||
| + | |||
| + | ===== 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]] | ||
| + | |||
| Line 78: | Line 93: | ||
| ^ ATLAS | 13 TeV | Rhad. | Search for metastable heavy charged particles with large ionization energy loss in pp collisions at 13 TeV using the ATLAS experiment [[ https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-03/]] | | ^ ATLAS | 13 TeV | Rhad. | Search for metastable heavy charged particles with large ionization energy loss in pp collisions at 13 TeV using the ATLAS experiment [[ https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-03/]] | | ||
| ^ 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 | 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 | DV | 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 | 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 | 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/]] | | ||
| Line 97: | Line 112: | ||
| ^ 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 | 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]] | | ^ 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]] | | ||
| - | ^ LHCb| 8 TeV | Disp. jets | Updated search for long-lived particles decaying to jet pairs [[https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-065.html ]] | | + | ^ LHCb| 8 TeV | Disp. jets | Updated search for long-lived particles decaying to jet pairs [[https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-065.html ]]; see also thesis: [[http://www.nikhef.nl/pub/services/biblio/theses_pdf/thesis_P_N_David.pdf]] | |
| - | ^ LHCb | 7 & 8 TeV | |Search for massive long-lived particles decaying semileptonically in the LHCb detector [[ https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-065.html ]] | | + | ^ LHCb | 7 & 8 TeV | |Search for massive long-lived particles decaying semileptonically in the LHCb detector [[ https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-047.html ]] | |
| ===== Simplified models definitions ===== | ===== Simplified models definitions ===== | ||
| Ideas for simplified models and analysis: | Ideas for simplified models and analysis: | ||
| - | * Displaced tops: SUSY models with stop NLSP, simplified models (emerged from discussion as most interesting candidate model). | + | * Displaced tops: SUSY models with stop NLSP, simplified models (emerged from discussion as most interesting candidate model). See [[disptop|here]], |
| * Disappearing R-hadrons: SUSY models with coloured NLSP and small mass splittings (probably not the most interesting scenario to explore for now). | * Disappearing R-hadrons: SUSY models with coloured NLSP and small mass splittings (probably not the most interesting scenario to explore for now). | ||
| - | |||
| - | ===== Displaced tops: Further work. ===== | ||
| - | The relevant UFO file already exists here: https://arxiv.org/abs/1412.5589. One can independently vary the stop and neutralino mass splitting, as well as the coupling that enables decays, which are denoted gL and gR. For now we may as well set gL=gR, such that we have only three parameters: m_stop, m_chi, and g. For any value of the former two, we may choose a lifetime from the latter. | ||
| - | |||
| - | How does this model map onto the various searches (displaced jets, R-hadron etc)? Are there any blind spots? Are the searches effectively recastable? | ||
2017/groups/np/llpsm.1498036859.txt.gz · Last modified: 2017/06/21 11:20 by gabriel.facini
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