The Fate Of Long Lived Superparticles With Hadronic Decays After Lhc Run 1
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The Fate Of Long Lived Superparticles With Hadronic Decays After Lhc Run 1
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Author :
language : en
Publisher:
Release Date : 2015
The Fate Of Long Lived Superparticles With Hadronic Decays After Lhc Run 1 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Supersymmetry searches at the LHC are both highly varied and highly constraining, but the vast majority are focused on cases where the final-stage visible decays are prompt. Scenarios featuring superparticles with detector-scale lifetimes have therefore remained a tantalizing possibility for sub-TeV SUSY, since explicit limits are relatively sparse. Nonetheless, the extremely low backgrounds of the few existing searches for collider-stable and displaced new particles facilitates recastings into powerful long-lived superparticle searches, even for models for which those searches are highly non-optimized. In this paper, we assess the status of such models in the context of baryonic R-parity violation, gauge mediation, and mini-split SUSY. We explore a number of common simplified spectra where hadronic decays can be important, employing recasts of LHC searches that utilize different detector systems and final-state objects. The LSP/NLSP possibilities considered here include generic colored superparticles such as the gluino and light-flavor squarks, as well as the lighter stop and the quasi-degenerate Higgsino multiplet motivated by naturalness. We find that complementary coverage over large swaths of mass and lifetime is achievable by superimposing limits, particularly from CMS's tracker-based displaced dijet search and heavy stable charged particle searches. Adding in prompt searches, we find many cases where a range of sparticle masses is now excluded from zero lifetime to infinite lifetime with no gaps. In other cases, the displaced searches furnish the only extant limits at any lifetime.
Search For New Physics With Long Lived Particles Decaying To Photons And Missing Energy In Pp Collisions At A Center Of Mass Energy Of 7 Tev With The Cms Experiment At The Lhc
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Author : Hongliang Liu
language : en
Publisher:
Release Date : 2011
Search For New Physics With Long Lived Particles Decaying To Photons And Missing Energy In Pp Collisions At A Center Of Mass Energy Of 7 Tev With The Cms Experiment At The Lhc written by Hongliang Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Gauge invariance categories.
We perform a search for long-lived neutral particles decaying into a photon and invisible particles in pp collisions at a center-of-mass energy of 7 TeV at the Large Hadron Collider. In the context of gauge mediated supersymmetry with the lightest neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest supersymmetric particle, the neutralino can decay into a gravitino and a photon with a non-zero lifetime. The impact parameter of the photon relative to the beam-beam collision point can be reconstructed using converted photons. The method is sensitive to lifetimes of the order of [Special characters omitted.] (0.1 ns). The data sample corresponds to an integrated luminosity of 2.1 ± 0.1 fb -1 recorded in the first part of 2011 by the CMS experiment at the LHC at [Special characters omitted.] = 7 TeV. The search is performed using events containing photons, missing transverse energy and jets. Upper limits at the 95% confidence level are presented on the cross section for such particles from pair-production, each of which decays into a photon and invisible particles.
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb-1 of proton-proton collision data at [arrow]" = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
Search For Decays Of Stopped Long Lived Particles Produced In Proton U2013 Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Decays Of Stopped Long Lived Particles Produced In Proton U2013 Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6 fb-1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13.2+3.6 -2.5 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≤1000 GeV and a top squark with mass ≤525 GeV are excluded, for lifetimes between 1 æs and 1000 s. Finally, these results are the most stringent constraints on stopped particles to date.
Search For Exotic Long Lived Particles Decaying Into Hadronic States In The Calorimeter Of The Atlas Detector At The Large Hadron Collider
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Author : Alice Polyxeni Morris
language : en
Publisher:
Release Date : 2021
Search For Exotic Long Lived Particles Decaying Into Hadronic States In The Calorimeter Of The Atlas Detector At The Large Hadron Collider written by Alice Polyxeni Morris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.