Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a S
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Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a 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.
Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb-1 of data collected by the ATLAS detector in √8 TeV proton-proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for R-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. Our analysis was performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results were interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass mg ̃ 1 TeV for a neutralino mass msub?0̃ 1/sub = 500 GeV. Direct gluino decays to six quarks are excluded for msubg
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At Root S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At Root 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.
Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb-1 of data collected by the ATLAS detector in [arrow]" TeV proton-proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for R-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. Our analysis was performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results were interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass mg~
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp 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.
Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb-1 of data collected by the ATLAS detector in [arrow]" = 8 TeV proton-proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for R-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. The analysis is performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results are interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass m-g
Search For Pair Produced Long Lived Neutral Particles Decaying To Jets In The Atlas Hadronic Calorimeter In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Pair Produced Long Lived Neutral Particles Decaying To Jets In The Atlas Hadronic Calorimeter In Pp Collisions At U221a 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.
The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb-1 of data collected in proton–proton collisions at √s=8 TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particle mass from 10 GeV to 150 GeV.
Search For New T Particles In Final States With Large Jet Multiplicities And Missing Transverse Energy In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2011
Search For New T Particles In Final States With Large Jet Multiplicities And Missing Transverse Energy In Pp Collisions At U221a 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 2011 with categories.
We present a search for a new particle T decaying to a top quark via T = t + X, where X goes undetected. We use a data sample corresponding to 5.7 fb-1 of integrated luminosity of pp collisions with √s = 1.96 TeV, collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of T' is focused on the hadronic decay channel, pp = TT= tt+XX=bqqbqq + XX. We interpret our results in terms of a model where T is an exotic fourth generation quark and X is a dark matter particle. The data are consistent with standard model expectations. We set a limit on the generic production of TT = tt =+ XX, excluding the fourth generation exotic quarks T at 95% confidence level up to mT = 400 GeV/c2 for mX ≤ 70 GeV/c2.
Search For New Phenomena In Final States With An Energetic Jet And Large Missing Transverse Momentum In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Final States With An Energetic Jet And Large Missing Transverse Momentum In Pp Collisions At 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 2016 with categories.
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 3.2 fb–1 at √s=13 TeV collected in 2015 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons. Several signal regions are considered with increasing missing-transverse-momentum requirements between EmissT > 250 GeV and EmissT > 700 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. Here, the results are translated into exclusion limits in models with large extra spatial dimensions, pair production of weakly interacting dark-matter candidates, and the production of supersymmetric particles in several compressed scenarios.
Search For Supersymmetry In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Search For Supersymmetry In Pp 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 2014 with categories.
Results are reported from a search for supersymmetry in pp collisions at a center-of-mass energy of 8 TeV, based on events with a single isolated lepton (electron or muon) and multiple jets, at least two of which are identified as b jets. The data sample corresponds to an integrated luminosity of 19.3 inverse femtobarns recorded by the CMS experiment at the LHC in 2012. The search is motivated by supersymmetric models that involve strong-production processes and cascade decays of new particles. The resulting final states contain multiple jets as well as missing transverse momentum from weakly interacting particles. The event yields, observed across several kinematic regions, are consistent with the expectations from standard model processes. Thus the results are interpreted in the context of simplified supersymmetric scenarios with pair production of gluinos, where each gluino decays to a top quark-antiquark pair and the lightest neutralino. For the case of decays via virtual top squarks, gluinos with a mass smaller than 1.26 TeV are excluded for low neutralino masses.
Search For High Mass Diphoton Resonances In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For High Mass Diphoton Resonances In Pp Collisions At U221a 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.
This article describes a search for high-mass resonances decaying to a pair of photons using a sample of 20.3 fb-1 of pp collisions at √s = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. The data are found to be in agreement with the Standard Model prediction, and limits are reported in the framework of the Randall-Sundrum model. This theory leads to the prediction of graviton states, the lightest of which could be observed at the Large Hadron Collider. A lower limit of 2.66 (1.41) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k/M¯Pl = 0.1 (0.01).
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 Events With Two Displaced Vertices From Pair Produced Neutral Long Lived Particles Decaying To Hadronic Jets In The Muon Spectrometer Of The Atlas Detector With Full Run 2 Data
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Author : Audrey Kvam
language : en
Publisher:
Release Date : 2022
Search For Events With Two Displaced Vertices From Pair Produced Neutral Long Lived Particles Decaying To Hadronic Jets In The Muon Spectrometer Of The Atlas Detector With Full Run 2 Data written by Audrey Kvam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This analysis is a search for events with two displaced vertices reconstructed from the decay of pair-produced neutral, weakly-interacting, long-lived particles using the muon spectrometer of the ATLAS detector. The search uses a model-independent strategy, and employs a custom trigger for reconstructing displaced hadronic jets in the muon spectrometer with 139 fb-1 of pp collision data at [square root of]s=13 TeV collected in Run 2 at the LHC. The results are interpreted in terms of a Higgs scalar portal model, which probes the existence of a hidden sector that weakly couples to the Standard Model. The search observed 0 events in the signal region, which is compatible with the expected background of 0.32 ± 0.05 events. Limits were set on long-lived particle lifetime for all simulated signal mass points. For the Higgs boson with a mass of 125 GeV, the analysis reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for long-lived particle proper lifetimes ranging from 4 cm to 72.4 m. In addition, the analysis presents the first results for the decay of long-lived particles into tt ̅ in the ATLAS muon spectrometer.