A Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance With The Cms Detector At The Lhc
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A Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance With The Cms Detector At The Lhc
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Author : Nicholas Charles Smith
language : en
Publisher:
Release Date : 2018
A Search For New Physics In Events With A Leptonically Decaying Z Boson And A Large Transverse Momentum Imbalance With The Cms Detector At The Lhc written by Nicholas Charles Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
A search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton-proton collisions collected at sqrt(s) = 13 TeV in 2016 with the Compact Muon Solenoid detector at the Large Hadron Collider is presented. The results of this search are interpreted in terms of a simplified model of dark matter production via spin-0 or spin-1 mediators, a scenario with a standard-model-like Higgs boson produced in association with the Z boson and decaying invisibly, a model of unparticle production, and a model with large extra spatial dimensions. No significant deviations from the background expectations are found, and limits are set on relevant model parameters, significantly extending the results previously achieved in this channel.
Search For A Dijet Resonance In Events With Jets And Missing Transverse Energy In Pp Over Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For A Dijet Resonance In Events With Jets And Missing Transverse Energy In Pp Over 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 2013 with categories.
We report on a search for a dijet resonance in events with only two or three jets and large imbalance in the total event transverse momentum. This search is sensitive to the possible production of a new particle in association with a W or Z boson, where the boson decays leptonically with one or more neutrinos in the final state. We use the full data set collected by the CDF II detector at the Tevatron collider at a proton-antiproton center-of-mass energy of 1.96 TeV. These data correspond to an integrated luminosity of 9.1 fb{̂-1}. We study the invariant mass distribution of the two jets with highest transverse energy. We find good agreement between data and standard model background expectations and measure the combined cross section for WW, WZ, and ZZ production to be 13.8{̂+3.0}_{-2.7} pb. No significant anomalies are observed in the mass spectrum and 95% credibility level upper limits are set on the production rates of a potential new particle in association with a W or Z boson.
Estimation Of The Invisible Z Background To Hadronic Supersymmetry Searches Performed With Proton Proton Collision Data At 7 And 8 Tev Observed With The Cms Detector During The First Run Of The Cern Large Hadron Collider
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Author : Jared Todd Sturdy
language : en
Publisher:
Release Date : 2013
Estimation Of The Invisible Z Background To Hadronic Supersymmetry Searches Performed With Proton Proton Collision Data At 7 And 8 Tev Observed With The Cms Detector During The First Run Of The Cern Large Hadron Collider written by Jared Todd Sturdy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Large Hadron Collider (France and Switzerland) categories.
In searches for SUSY in all-hadronic channels, events with jets and a Z boson form an irreducible background when the Z boson decays to a pair of neutrinos. For R-parity conserving Susy models, every decay chain involving a superparticle must result in at least one lightest supersymmetric particle (LSP), which can be neutral and noninteracting. The detector signature for the LSP is identical to that of the two neutrinos from the Z, which appear as an imbalance in the transverse momentum of the event. The characterization of these types of events is crucially important in any search for new physics performed in a multi-jets+missing transverse momentum channel. A method for estimating this irreducible background using events with a measured photon is presented, and the results for a search performed in the all-hadronic multi-jet channel are shown to be consistent with standard model expectations. Limits are set on the mass of expected new particles in various models.
A Search For New Physics Producing Jets Large Mt2 And Disappearing Tracks In 13 Tev Proton Proton Collisions At Cern S Large Hadron Collider
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Author : Dylan Gilbert
language : en
Publisher:
Release Date : 2020
A Search For New Physics Producing Jets Large Mt2 And Disappearing Tracks In 13 Tev Proton Proton Collisions At Cern S Large Hadron Collider written by Dylan Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This work presents two searches for new physics characterized by pair-production of strongly interacting particles, each decaying to hadronic jets and a particle that is not detectable. The searches use the full 13 TeV proton-proton collision dataset produced by CERN's Large Hadron Collider and recorded by the CMS detector from 2016 to 2018, with total integrated luminosity 137 fb-1. The presence of particles interacting too weakly to be detected is inferred using imbalance in the transverse momentum of the collision products, and sensitivity to pair-production is enhanced by requiring large values of the kinematic variable MT2 in events with at least two jets. The first search is inclusive, binning events using the total hadronic transverse energy, the total number of jets, the number of jets reconstructed as originating from a bottom quark, and either the value of MT2 in multijet events, or the transverse momentum of the jet in monojet events. The second search extends the first, by requiring the presence of a disappearing track in the event, and adds binning in the length and transverse momentum of the disappearing track. Both searches are sensitive to a variety of extensions to the Standard Model that include dark matter candidates. Of greatest interest, the results set constraints on pair production of squarks and gluinos as predicted by R-parity conserving supersymmetric extensions of the Standard Model, in which the lightest supersymmetric particle is a neutralino. The first search is sensitive to any decay chain terminating in Standard Model hadrons plus the neutralino, while the second specifically targets, with greatly enhanced sensitivity, decay chains containing an intermediate long-lived chargino. These constraints are the most stringent yet produced by any experiment.
Search For New Phenomena With The Mono Jet Signature And A Direct Measurement Of The Z Boson Invisible Width With The Atlas Detector At The Cern Large Hadron Collider
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Author : Reyhaneh Rezvani
language : en
Publisher:
Release Date : 2013
Search For New Phenomena With The Mono Jet Signature And A Direct Measurement Of The Z Boson Invisible Width With The Atlas Detector At The Cern Large Hadron Collider written by Reyhaneh Rezvani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
A Search For New Physics With Z Bosons Jets And Missing Transverse Energy At Cms
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Author : Warren T. Andrews
language : en
Publisher:
Release Date : 2012
A Search For New Physics With Z Bosons Jets And Missing Transverse Energy At Cms written by Warren T. Andrews and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
I present a search for new physics in the final state of a Z boson, jets, and missing transverse energy in proton-proton collisions delivered by the Large Hadron Collider (LHC) at CERN in 2011 at a center of mass energy of 7 TeV and collected by the Compact Muon Solenoid (CMS) experiment.
A Measurement Of Z Small Nu Small N Small Gamma Production And A Search For New Physics In Monophoton Events Using The Cms Detector At The Lhc
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Author : James Joseph Buchanan
language : en
Publisher:
Release Date : 2019
A Measurement Of Z Small Nu Small N Small Gamma Production And A Search For New Physics In Monophoton Events Using The Cms Detector At The Lhc written by James Joseph Buchanan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This thesis presents several studies of monophoton final states using 35.9 fb^-1 of 13 TeV proton-proton collision data collected by the CMS experiment at the LHC in 2016. The standard model Z([small nu] [small n̄ū])[small gamma] cross section is measured as a function of photon transverse momentum. No significant deviations from standard model predictions are observed. The results are also interpreted in the context of several new physics models. Limits are placed on new particle masses in simplified models of dark matter, the suppression scale of a dark matter effective field theory model, and the graviton mass scale in a model of extra spatial dimensions.
Search For New Physics In Events With High Jet Multiplicity And Low Missing Transverse Momentum In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Physics In Events With High Jet Multiplicity And Low Missing Transverse Momentum In Proton 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 2016 with categories.
A dedicated search is presented for new phenomena in inclusive eight- and ten-jet final states with low missing transverse momentum, with and without identification of jets originating from b quarks. The analysis is based on data from proton-proton collisions corresponding to an integrated luminosity of 19.6 inverse femtobarns collected with the CMS detector at the LHC at sqrt(s) = 8 TeV. The dominant multijet background expectations are obtained from low jet multiplicity control samples. Data agree well with the standard model background predictions, and limits are set in several benchmark models. Colorons (axigluons) with masses between 0.6 and 0.75 (up to 1.15) TeV are excluded at 95% confidence level. Similar exclusion limits for gluinos in R-parity violating supersymmetric scenarios are from 0.6 up to 1.1TeV. These results comprise the first experimental probe of the coloron and axigluon models in multijet final states.
A Search For New Physics In Final States With Two Opposite Signsame Flavor Leptons Jets And Missing Transverse Energy Inproton Proton Collisions With A Center Of Mass Energy Of 13 Tev
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Author : Charles Vincent Welke
language : en
Publisher:
Release Date : 2016
A Search For New Physics In Final States With Two Opposite Signsame Flavor Leptons Jets And Missing Transverse Energy Inproton Proton Collisions With A Center Of Mass Energy Of 13 Tev written by Charles Vincent Welke 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.
A search is performed in final states with Z$\rightarrow\ell\ell$, jets, and missing transverse momentum using data collected with the CMS detector at the CERN LHC in 2015 corresponding to an integrated luminosity of 2.3~\fbinv of pp collisions at $\sqrt{s}=13$\TeV. Signal regions are defined to maximize sensitivity to new physics including one to search where ATLAS reported a 3.0~$\sigma$ excess at 8~TeV. The observations in all regions are consistent with the predicted standard model backgrounds, and the results are interpreted in the context of simplified models of supersymmetry.
Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN 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.
Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four charged leptons (3l and 4l, ) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from pp collisions delivered by the Large Hadron Collider at a centre-of-mass energy of TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb−1. The 3l and 4l phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a Z-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section