Search For Charged Higgs Bosons In The Tau Lepton Final State With 36 1 Fb 1 Of Pp Collision Data Recorded At Square Root S
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Search For Charged Higgs Bosons In The Tau Lepton Final State With 36 1 Fb 1 Of Pp Collision Data Recorded At Square Root S
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Author : Blake Burghgrave
language : en
Publisher:
Release Date : 2018
Search For Charged Higgs Bosons In The Tau Lepton Final State With 36 1 Fb 1 Of Pp Collision Data Recorded At Square Root S written by Blake Burghgrave and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Nuclear physics categories.
This dissertation describes a search for charged Higgs bosons decaying to a tau and a neutrino (H+ [right arrow] [tau]+[nu][sub t] or the charge-conjugate process) in association with a leptonically decaying top quark, using 36.1 fb−1 of pp collision data collected with [square root]s = 13 TeV by the ATLAS detector. The theoretical motivation, including a review of the Standard Model, is given, along with a description of the ATLAS detector and particle reconstruction. A multi-variate analysis approach uses stochastic gradient boosted decision trees to improve the separation between H^[+/-] signal and background. The semi-leptonic channel described in this thesis is used in combination with a fully hadronic channel to search for charged Higgs bosons in a mass range of 90 GeV [less than or equal to] m[sub H^[+/-]] [less than or equal to] 2000 GeV. Finding no significant excess, limits are set at the 95% confidence level on the charged Higgs production cross section times the branching fraction into [tau][nu] ranging from 4.2 pb to 2.5 fb. These limits are interpreted in the hMSSM benchmark scenario as an exclusion at 95% confidence on tan[beta] as a function of m[sub H^[+/-]]. In this scenario, for tan[beta] = 60, the H^[+/-] mass range up to 1100 GeV is excluded, with all values of tan[beta] exclude for m[sub H^[+/-]] [precedes or equivalent to] 160 GeV.
Search For Charged Higgs Bosons In The Lepton Final State With 36 1 Fb 1 Of Pp Collision Data Recorded At S
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Author : Blake Burghgrave
language : en
Publisher:
Release Date : 2018
Search For Charged Higgs Bosons In The Lepton Final State With 36 1 Fb 1 Of Pp Collision Data Recorded At S written by Blake Burghgrave 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.
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H 2 Tau Nu Using Pp Collision Data Recorded At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H 2 Tau Nu Using Pp Collision Data Recorded At Mml 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.
In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→[tau][nu] are searched for with the ATLAS experiment at the LHC, using proton-proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic [tau] decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, [sigma](pp→[b]tH±)×BR(H±→[tau][nu]) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton-proton collision data recorded at √s=8 TeV.
Search For Higgs Bosons Decaying Into New Spin 0 Or Spin 1 Particles In Four Lepton Final States With The Atlas Detector With 139 Fb 1 Of Pp Collision Data At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Higgs Bosons Decaying Into New Spin 0 Or Spin 1 Particles In Four Lepton Final States With The Atlas Detector With 139 Fb 1 Of Pp Collision Data 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.
Search For Higgs Bosons Decaying To Aa In The Mu Mu Tau Tau Final State In Pp Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Higgs Bosons Decaying To Aa In The Mu Mu Tau Tau Final State 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.
A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated luminosity of 20.3 fb-1 of pp collisions at [arrow]" = 8 TeV recorded by the ATLAS experiment at the LHC in 2012. The search was done in the context of the next-to-minimal supersymmetric standard model, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two muons while the other is required to decay to two [tau] leptons. No significant excess is observed above the expected backgrounds in the dimuon invariant mass range from 3.7 to 50 GeV. Upper limits are placed on the production of h 2!aa relative to the standard model gg 2!h production, assuming no coupling of the a boson to quarks. The most stringent limit is placed at 3.5% for ma = 3.75 GeV. The upper limits are also placed on the production cross section of H 2!aa from 2.33 to 0.72 pb, for fixed ma = 5 GeV with mH ranging from 100 to 500 GeV.
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H U2192 Using Pp Collision Data Recorded At
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Author :
language : en
Publisher:
Release Date : 2016
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H U2192 Using Pp Collision Data Recorded At 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.
In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→?? are searched for with the ATLAS experiment at the LHC, using proton–proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic ? decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, ?(pp→[b]tH±)×BR(H±→??) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton–proton collision data recorded at √s=8 TeV.
Search For Charged Higgs Bosons In Tau Lepton Final States With 139 Inverse Femtobarns Of Proton Proton Collision Data Recorded At A Centre Of Mass Energy Of 13 Tev With The Atlas Detector
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Author : Sina Bahrasemani
language : en
Publisher:
Release Date : 2019
Search For Charged Higgs Bosons In Tau Lepton Final States With 139 Inverse Femtobarns Of Proton Proton Collision Data Recorded At A Centre Of Mass Energy Of 13 Tev With The Atlas Detector written by Sina Bahrasemani 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.
The Higgs boson, with a measured mass of approximately $125~GeV$, has been studied extensively since its discovery in 2012 at the Large Hadron Collider. This discovery opens the question of whether the Higgs boson of the Standard Model (SM) is the only scalar particle of Nature or it belongs to a larger scalar sector, as predicted in many Beyond the Standard Model (BSM) theories. Therefore, observation of charged Higgs bosons would indicate new physics. This thesis presents results of a search for a charged Higgs boson in the mass range $80~GeV$ to $3~TeV$, through tau-lepton final states. The search is performed using proton-proton collisions data at $\sqrt{s}=13~\mbox{TeV}$, collected with the ATLAS experiment, during 2015 to 2018. The final results are interpreted in the context of the Minimal SuperSymmetric Standard Model (MSSM) benchmark scenarios. In these scenarios, charged Higgs bosons coupling to tau-lepton are enhanced for some parts of the search phase space, thus increasing the chance of their discovery. No significant excess of events above the expected background from the Standard Model processes is observed. Therefore, upper limits on the charged Higgs boson production cross section times its branching ratio to tau-lepton and its associated neutrino are set at a 95\% Confidence Level. The results are also interpreted in the context of the hMSSM and $m^{mod -}_{h}$ benchmark scenarios of the MSSM. Due to the enhancement of the charged Higgs boson coupling to tau-leptons at high values of the $\tan\beta$ parameter of the MSSM, it is possible to exclude the high $\tan\beta$ region in the $M_{H^{\pm}}$--$\tan\beta$ parameter space. In this work, $\tan\beta$ values around 60 are excluded up to a charged Higgs boson mass of $1400~\GeV$. Furthermore, in the low mass region, below $170~GeV$, all values of $\tan\beta$ in range 1--60 are excluded at 95\% confidence level.
Search For New Light Gauge Bosons In Higgs Boson Decays To Four Lepton Final States In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For New Light Gauge Bosons In Higgs Boson Decays To Four Lepton Final States 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 2015 with categories.
This research presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons Zd, H 2!ZZd 2!4l or H 2!ZdZd 2!4l. The search was performed using pp collision data corresponding to an integrated luminosity of about 20 fb-1 at the center-of-mass energy of \(\sqrt{s} = 8\) TeV recorded with the ATLAS detector at the Large Hadron Collider. The observed data are well described by the Standard Model prediction. Upper bounds on the branching ratio of H 2!ZZd 2!4l and on the kinetic mixing parameter between the Zd and the Standard Model hypercharge gauge boson are set in the range (1-9) × 10-5 and (4-17) × 10-2 respectively, at 95% confidence level assuming the Standard Model branching ratio of H 2!ZZ* 2!4l, for Zd masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the Z and the Zd are also set using the branching ratio limits in the H 2!ZZd 2!4l search, and are in the range (1.5-8.7) × 10-4 for 15
Search For Higgs Boson Pair Production In The Bb Final State Using Pp Collision Data At S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Higgs Boson Pair Production In The Bb Final State Using Pp Collision Data 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 2015 with categories.
A search for Higgs boson pair production \(pp \rightarrow hh\) is performed with 19.5 fb\(^{-1}\) of proton-proton collision data at \(\sqrt{s}=8\) TeV, which were recorded by the ATLAS detector at the Large Hadron Collider in 2012. The decay products of each Higgs boson are reconstructed as a high-momentum \(b\bar{b}\) system with either a pair of small-radius jets or a single large-radius jet, the latter exploiting jet substructure techniques and associated b-tagged track-jets. No evidence for resonant or non-resonant Higgs boson pair production is observed. The data are interpreted in the context of the Randall-Sundrum model with a warped extra dimension as well as the two-Higgs-doublet model. An upper limit on the cross-section for \(pp\rightarrow G^{*}_{\mathrm {KK}} \rightarrow hh \rightarrow b\bar{b}b\bar{b} \) of 3.2 (2.3) fb is set for a Kaluza-Klein graviton \(G^{*}_{\mathrm {KK}}\) mass of 1.0 (1.5) TeV, at the 95 % confidence level. The search for non-resonant Standard Model hh production sets an observed 95 % confidence level upper limit on the production cross-section \(\sigma (pp \rightarrow hh \rightarrow b\bar{b}b\bar{b})\) of 202 fb, compared to a Standard Model prediction of \(\sigma (pp \rightarrow hh \rightarrow b\bar{b}b\bar{b}) = 3.6 \pm 0.5\) fb.
Search For A Low Mass Standard Model Higgs Boson In The Tau Tau Decay Channel In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Search For A Low Mass Standard Model Higgs Boson In The Tau Tau Decay Channel In P Bar P 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 2012 with categories.
We report on a search for the standard model Higgs boson decaying into pairs of? leptons in p{bar p} collisions produced by the Tevatron at √s = 1.96 TeV. The analyzed data sample was recorded by the CDFII detector and corresponds to an integrated luminosity of 6.0 fb−1. The search is performed in the final state with one? decaying leptonically and the second one identified through its semi-hadronic decay. Since no significant excess is observed, a 95% credibility level upper limit on the production cross section times branching ratio to the?? final state is set for hypothetical Higgs boson masses between 100 and 150 GeV/c2. For a Higgs boson of 120 GeV/c2 the observed (expected) limit is 14.6 (15.3) the predicted value.