A Search For Charged Higgs Bosons In Multilepton Final States And A Measurement Of P P To Wz To L V L L With The Cms Detector At The Lhc
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A Search For Charged Higgs Bosons In Multilepton Final States And A Measurement Of P P To Wz To L V L L With The Cms Detector At The Lhc
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Author : Devin Nathaniel Taylor
language : en
Publisher:
Release Date : 2017
A Search For Charged Higgs Bosons In Multilepton Final States And A Measurement Of P P To Wz To L V L L With The Cms Detector At The Lhc written by Devin Nathaniel Taylor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This thesis presents a search for a doubly-charged Higgs boson in three and four lepton final states. The two production modes considered are the associated production mode with a doubly-charged Higgs boson produced in association with a singly-charged Higgs boson and the pair production mode with the simultaneous production of two doubly-charged Higgs bosons. The search is performed with 12.9 fb-1 of square root s = 13 TeV proton-proton collision data collected with the Compact Muon Solenoid at the Large Hadron Collider. In addition, this thesis presents the first measurement of the WZ production cross section in proton-proton collisions at square root s = 13 TeV. The measurement is performed in the WZ to [l][v][l]'[l]' decay mode where [l],[l]' = e, [mu] with an integrated luminosity of 2.3 fb-1.
Precision Measurement Of The Higgs Boson Mass And Search For Dilepton Mass Resonances In H To 4l Decays Using The Cms Detector At The Lhc
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Author : Jake Rosenzweig
language : en
Publisher:
Release Date : 2022
Precision Measurement Of The Higgs Boson Mass And Search For Dilepton Mass Resonances In H To 4l Decays Using The Cms Detector At The Lhc written by Jake Rosenzweig 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.
Expectations of the total uncertainty are placed on the Higgs boson mass (mH) in the H to ZZstar to 4l (l = e, mu) decay channel. The value of mH, including statistical and systematic uncertainties, is estimated to be mH = 125.38 +- 0.11 [0.11 (stat.) +- 0.02 (syst.)] GeV. Once the data are unblinded, this measurement is predicted to be the world's most precise measurement of mH to date. The data used in the analysis were produced by proton-proton collisions at the Large Hadron Collider (LHC) with a center-of-mass energy of 13 TeV during Run 2 (2016-2018), corresponding to an integrated luminosity of 137.1 fb-1, and were collected by the Compact Muon Solenoid experiment. Using data sets from the same LHC run period, a search for low-mass dilepton resonances in Higgs boson decays to the 4l final state is also conducted. The Hidden Abelian Higgs Model is used in the search for a beyond the Standard Model dark photon (ZD) particle. Constraints are placed at 95% confidence level on the Higgs-mixing parameter k
Discovery Of The Higgs Boson And A Search For Beyond The Standard Model Physics In Zz Decays Using The Cms Detector At The Lhc
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Author :
language : en
Publisher:
Release Date : 2013
Discovery Of The Higgs Boson And A Search For Beyond The Standard Model Physics In Zz Decays Using The Cms Detector At The Lhc 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.
A study of the pp to ZZ 6́2 llll final state is conducted using 19.6 inverse femtobarn of 8 TeV proton-proton collisions at the LHC using the CMS detector. The Standard Model pp 6́2 ZZ production cross section is measured to be 7.7+0.5 -0.5 (stat.) +0.6 -0.5(sys.) ± 0.3(lumi) pb. Evidence of a new Higgs-like boson is observed with a significance of 6.1ï3 at 126 GeV. 95% confidence level upper limits are set on the neutral anomalous triple gauge couplings; -0.004
Search For A Charged Higgs Boson In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For A Charged Higgs Boson 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.
Our search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 ± 0.5 fb-1 collected with the CMS detector in proton-proton collisions at √s=8,TeV. The charged Higgs boson is searched for in top quark decays for m H± m t - m b, and in the direct production pp → t(b)Hsup± /supfor m H± m t - m born The H± → ? ± ? ? and H± → tb decay modes in the final states ? h+jets, ?? h, l+jets, and ll’ (l =e, ?) are considered in the search. No signal is observed and 95% confidence level upper limits are set on the charged Higgs boson production. Furthermore, a model-independent upper limit on the product branching fraction B(t→H±b)B(H±→?±??)=1.2-0.15% is obtained in the mass range m H± = 80–160 GeV, while the upper limit on the cross section times branching fraction ?(pp→t(b)H±)B(H±→ ?±??)=0.38-0.025 pb is set in the mass range m H+ = 180–600 GeV. Here, ?(pp → t(b)H±) stands for the cross section sum ?(pp→t¯(b)H+)+?(pp→t(b¯)H-). Assuming B(H±→tb)=1, an upper limit on ?(pp → t(b)H±) of 2.0–0.13 pb is set for m H± = 180–600 GeV. The combination of all considered decay modes and final states is used to set exclusion limits in the m H±-tan ? parameter space in different MSSM benchmark scenarios.
Search For Doubly Charged Higgs Boson In Multi Lepton Final States With The Atlas Detector
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Author : Katja Mankinen
language : en
Publisher:
Release Date : 2020
Search For Doubly Charged Higgs Boson In Multi Lepton Final States With The Atlas Detector written by Katja Mankinen 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.
Search For Charged Higgs Bosons Decaying Via H In Fully Hadronic Final States With The Atlas Detector At The Lhc
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Author : Anna Kopp
language : en
Publisher:
Release Date : 2015
Search For Charged Higgs Bosons Decaying Via H In Fully Hadronic Final States With The Atlas Detector At The Lhc written by Anna Kopp 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.
Zusammenfassung: Searches for charged Higgs bosons decaying to a tau lepton and a neutrino in fully hadronic final states are presented in this thesis. The analyses are based on 4.6fb^-1 and 19.5fb^-1 of proton-proton collision data taken with the ATLAS detector at the LHC at center-of-mass energies of 7TeV and 8TeV in 2011 and 2012, respectively.Charged Higgs bosons with masses less than the top quark mass are searched for in events consistent with top-quark pair production and charged Higgs bosons with masses greater than the top quark mass are searched for in associated production with a top quark.In the search based on data taken in 2011, all background contributions are estimated in data-driven ways. Only a minor background contribution is estimated using simulation in the searches based on data taken in 2012; all dominant background contributions are estimated using data-driven methods here as well. An embedding method is used in all searches to assess the dominant and irreducible background contributions containing true hadronically decaying tau leptons and described in detail in this thesis.No significant excess of the data compared to the background expectations due to Standard Model processes is observed. Statistical analyses lead to 95% confidence-level upper limits on the branching ratios B(t->bH^±)xB(H^±->tau^± nu) between 0.23% and 1.3% for charged Higgs boson masses between 80GeV and 160GeV and on the production cross section times branching ratio, sigma(pp->tH^±+X)xB(H^±->tau^± nu) ranging from 0.76pb to 4.5fb for charged Higgs boson masses between 180GeV and 1000GeV. The branching ratio and cross section limits are used to derive constraints on the parameter space of minimal supersymmetric extensions of the Standard Model in various benchmark scenarios. These limits are the so far strictest limits set by the ATLAS collaboration in the search for charged Higgs bosons in fully hadronic final states
Search For Higgs Boson Decays To Long Lived Scalar Particles In Pp Interactions At 13 Tev
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Author : Daniel Cipriano Diaz
language : en
Publisher:
Release Date : 2020
Search For Higgs Boson Decays To Long Lived Scalar Particles In Pp Interactions At 13 Tev written by Daniel Cipriano Diaz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Physics categories.
Presented in this thesis are the results of a novel search for exotic particles produced at the Large Hadron Collider (LHC). The search is performed using the data collected by the Compact Muon Solenoid (CMS) detector during the Run II period (2016 - 2018) of data taking. The data corresponds to a total integrated luminosity of 117fb-1, recorded at [square root of s] = 13 TeV. The search is performed in the topology where the Higgs boson is produced in association with a Z boson. The Higgs boson may decay to two exotic long-lived scalar particles (S). Final states where the long-lived particle decays to pairs of either b-quarks, d-quarks or [tau]-leptons are considered. No significant excess in the data with respect to the expected number of events containing decays to long-lived particles was observed. Limits are set on the branching ratio BR(H-SS) for the final states where the long-lived particle decays to pairs of b-quarks or d-quarks. No limit is set for the final state containing decays of the long-lived particles to pairs of [tau]-leptons. The limits reflect the most stringent results for the decays of the scalar particles to low mass ( 20 GeV) particles with lifetimes in the range 10 c[tau]
Searching For The Higgs Boson Produced In Association With A Pair Of Top Quarks In Multilepton Final States Using The Atlas Detector At The Lhc
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Author : David Anthony DeMarco
language : en
Publisher:
Release Date : 2019
Searching For The Higgs Boson Produced In Association With A Pair Of Top Quarks In Multilepton Final States Using The Atlas Detector At The Lhc written by David Anthony DeMarco 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.
Measurement Of W Bb And A Search For Mssm Higgs Bosons With The Cms Detector At The Lhc
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of W Bb And A Search For Mssm Higgs Bosons With The Cms Detector At The Lhc 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.
This thesis describes a Standard Model (SM) cross section measurement of W+bb as well as a search for neutral Higgs bosons in the Minimal Supersymmetric Extension of the Standard Model (MSSM) decaying to tau pairs. The measurement of W+bb was performed using proton-proton collisions at sqrt(s) = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 1/fb. The W+bb events are selected in the W to muon + neutrino decay mode by requiring a muon with transverse momentum pT>25 GeV and pseudorapidity absolute eta less than 2.1, and exactly two b-tagged jets with pT>25 GeV and absolute eta less than 2.4. The measured W+bb production cross section in the fiducial region, calculated at the level of final-state particles, is 0.53± 0.05(stat.) ± 0.09 (syst.) ± 0.06 (theory) ± 0.01 (lum.) pb, in agreement with the SM prediction. This measurement is a sensitive test of heavy quark production calculated with perturbative QCD. It also serves as an important benchmark in new physics searches which include a single isolated lepton and one or more b jets in the final state, as W+bb becomes an irreducible background. Also presented is a search for the CP-even MSSM Higgs bosons, H and h, and the CP-odd MSSM pseudoscalar, A, in their decays to tau pairs. This search is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012 at a center-of-mass energy of 7 TeV and 8 TeV respectively. The dataset corresponds to an integrated luminosity of 24.6 1/fb, with 4.9 1/fb at 7 TeV and 19.7 1/fb at 8 TeV. To enhance the sensitivity to neutral MSSM Higgs bosons, the search includes the case where the Higgs boson is produced in association with a b-quark jet. No excess is observed in the tau-pair invariant-mass spectrum.
Search For A Charged Higgs Boson In Proton Proton Collisions At The Lhc Using The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2013
Search For A Charged Higgs Boson In Proton Proton Collisions At The Lhc Using The Atlas Detector 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.