Search For The Decay Of The Higgs Boson To A Z Boson And A Long Lived Axion Like Particle Decaying To Two Photons With The Atlas Detector

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Search For The Decay Of The Higgs Boson To A Z Boson And A Long Lived Axion Like Particle Decaying To Two Photons With The Atlas Detector

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Author : Georgios Lamprinoudis
language : en
Publisher:
Release Date : 2025

Search For The Decay Of The Higgs Boson To A Z Boson And A Long Lived Axion Like Particle Decaying To Two Photons With The Atlas Detector written by Georgios Lamprinoudis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2025 with categories.

The Standard Model of particle physics is one of the most successful theories, capable of describing a wide range of observed physical processes. However, some phenomena cannot be explained within the Standard Model, necessitating a theoretical extension. The Large Hadron Collider (LHC) at CERN aids in this effort through precision tests and searches for Beyond Standard Model particles using dedicated analyses. Several well-motivated extensions of the Standard Model include Axion-Like Particles (ALPs), which can couple to photons. This thesis presents two searches for ALPs. The first search, described in the thesis, uses ATLAS Run 2 proton-proton (pp) data to constrain the exotic decay of the Higgs boson into a Z boson and an ALP, leading to a final state of two leptons and two photons. This measurement focuses on long-lived ALPs, which do not decay promptly, extending the excluded photon-ALP coupling phase space and providing limits for a range of couplings not previously covered by ATLAS. The second search, described in the thesis, utilizes ATLAS Run 3 lead-lead (PbPb) data to probe the resonant production of an ALP in photon-photon scattering within the ATLAS detector. This is the first ALP measurement in ATLAS at a collision energy of $$ sqrts} = 5.36$$ TeV.

Search For Displaced Photons From Exotic Decays Of The Higgs Boson With The Atlas Detector

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Author : Devin Mahon
language : en
Publisher:
Release Date : 2021

Search For Displaced Photons From Exotic Decays Of The Higgs Boson With The Atlas Detector written by Devin Mahon 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.

Agreement with background is observed with no significant excesses for any signal models considered. Limits at the 95% confidence level are placed on the branching ratio of the Higgs boson to two neutralinos in the context of the various signal models.

Search For Invisible Decays Of The Higgs Boson Produced In Association With A Hadronically Decaying Vector Boson In Pp Collisions At Arrow

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Author :
language : en
Publisher:
Release Date : 2015

Search For Invisible Decays Of The Higgs Boson Produced In Association With A Hadronically Decaying Vector Boson 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 Higgs boson decays to invisible particles is performed using 20.3 fb−1 of pp collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the Large Hadron Collider. The process considered is Higgs boson production in association with a vector boson (V = W or Z) that decays hadronically, resulting in events with two or more jets and large missing transverse momentum. No excess of candidates is observed in the data over the background expectation. The results are used to constrain V H production followed by H decaying to invisible particles for the Higgs boson mass range 115

A Search For The Higgs Boson Decaying To Two B Quarks In Association With A Dileptonically Decaying Top Quark Pair With The Atlas Detector

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Author : Ian Connelly
language : en
Publisher:
Release Date : 2016

A Search For The Higgs Boson Decaying To Two B Quarks In Association With A Dileptonically Decaying Top Quark Pair With The Atlas Detector written by Ian Connelly 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.

Search For Rare Exclusive Decays Of The Higgs And Z Bosons To A Meson And A Photon With The Atlas Detector

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Author : Rhys Edward Owen
language : en
Publisher:
Release Date : 2018

Search For Rare Exclusive Decays Of The Higgs And Z Bosons To A Meson And A Photon With The Atlas Detector written by Rhys Edward Owen 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 Associated Production Of A Z Boson With An Invisibly Decaying Higgs Boson Or Dark Matter Candidates At Square Root S

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Search For Associated Production Of A Z Boson With An Invisibly Decaying Higgs Boson Or Dark Matter Candidates 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 for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton−proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for ZH production, the observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator

Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2015

Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass 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.

Our search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ll?). The analysis is performed using proton–proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120 mll? 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H → ?*? → ll?, where the dilepton invariant mass is less than 20 GeV. A Higgs boson with mH=125 GeV has a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (5.9sup+2.8/supsub-1.8/sub ) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H → (J/?)? for the 125 GeV Higgs boson is set at 1.5 × 10

Searches For Rare Exclusive Higgs Boson Decays To A Meson And An Associated Photon With The Atlas Detector

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Author : James Harry Broughton
language : en
Publisher:
Release Date : 2018

Searches For Rare Exclusive Higgs Boson Decays To A Meson And An Associated Photon With The Atlas Detector written by James Harry Broughton 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 Invisible Higgs Boson Decays In Events With Vector Boson Fusion Signatures Using 139 Fb 1 Of Proton Proton Data Recorded By The Atlas Experiment

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Search For Invisible Higgs Boson Decays In Events With Vector Boson Fusion Signatures Using 139 Fb 1 Of Proton Proton Data Recorded By The Atlas Experiment 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 direct search for Higgs bosons produced via vector-boson fusion and subsequently decaying into invisible particles is reported. The analysis uses 139 fb−1 of pp collision data at a centre-of-mass energy of s√ = 13 TeV recorded by the ATLAS detector at the LHC. The observed numbers of events are found to be in agreement with the background expectation from Standard Model processes. For a scalar Higgs boson with a mass of 125 GeV and a Standard Model production cross section, an observed upper limit of 0.145 is placed on the branching fraction of its decay into invisible particles at 95% confidence level, with an expected limit of 0.103. These results are interpreted in the context of models where the Higgs boson acts as a portal to dark matter, and limits are set on the scattering cross section of weakly interacting massive particles and nucleons. Invisible decays of additional scalar bosons with masses from 50 GeV to 2 TeV are also studied, and the derived upper limits on the cross section times branching fraction decrease with increasing mass from 1.0 pb for a scalar boson mass of 50 GeV to 0.1 pb at a mass of 2 TeV

Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2015

Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass 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.

Our search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ll[gamma]). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120