Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN
<p>The observation of the decay of the Higgs boson to a b ̄b pair in 2018 confirmed the Yukawa interaction and provided the first measurement of a Yukawa coupling to down-type quarks.</p> <p>The most sensitive channel in the H → b ̄b measurement is given by the associated Higgs bos...
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| Format: | Thesis |
| Language: | English |
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2021
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| _version_ | 1826297695646515200 |
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| author | Foti, MG |
| author2 | Bortoletto, D |
| author_facet | Bortoletto, D Foti, MG |
| author_sort | Foti, MG |
| collection | OXFORD |
| description | <p>The observation of the decay of the Higgs boson to a b ̄b pair in 2018 confirmed the Yukawa interaction and provided the first measurement of a Yukawa coupling to down-type quarks.</p>
<p>The most sensitive channel in the H → b ̄b measurement is given by the associated Higgs boson production with a vector boson V decaying leptonically.</p>
<p>The main focus is now the measurement of the Higgs boson production cross section as a function of its transverse momentum (pT ). This study is motivated by a wide range of Beyond the Standard Model (BSM) theories predicting an enhancement of V H(H → b ̄b) events at high transverse momentum with respect to the SM expectations. At such high energy regimes, the Higgs boson is highly Lorentz-boosted and the H → b ̄b de- cay is reconstructed in the detector as a single object with a two-prong substructure.</p>
<p>This thesis describes the measurement of V H(H → b ̄b) in the boosted regime performed inclusively, as well as in bins of the vector boson trans- verse momentum, for p<sup>V</sup><sub>T</sub> ∈ [250,400[ GeV and p<sup>V</sup><sub>T</sub> ∈ [400,∞[ GeV. The interpretation of these measurements using the Effective Field Theory (EFT) framework is also discussed. The results are based on the full LHC Run 2 dataset collected by the ATLAS experiment, corresponding to an integrated luminosity of 139 fb<sup>−1</sup>. A very important component of this study is the correct identification of b-jets. A new calibration of the b-jet tagging algorithm at very high transverse momentum, which reduced the uncertainties for high-pT b-jets by 50%, is also included.</p> |
| first_indexed | 2024-03-07T04:35:36Z |
| format | Thesis |
| id | oxford-uuid:cfce6003-d925-4b21-a83b-f851f5539c93 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:35:36Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | oxford-uuid:cfce6003-d925-4b21-a83b-f851f5539c932022-03-27T07:45:28ZStudy of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERNThesishttp://purl.org/coar/resource_type/c_db06uuid:cfce6003-d925-4b21-a83b-f851f5539c93Particle beams, CollidingEnglishHyrax Deposit2021Foti, MGBortoletto, D<p>The observation of the decay of the Higgs boson to a b ̄b pair in 2018 confirmed the Yukawa interaction and provided the first measurement of a Yukawa coupling to down-type quarks.</p> <p>The most sensitive channel in the H → b ̄b measurement is given by the associated Higgs boson production with a vector boson V decaying leptonically.</p> <p>The main focus is now the measurement of the Higgs boson production cross section as a function of its transverse momentum (pT ). This study is motivated by a wide range of Beyond the Standard Model (BSM) theories predicting an enhancement of V H(H → b ̄b) events at high transverse momentum with respect to the SM expectations. At such high energy regimes, the Higgs boson is highly Lorentz-boosted and the H → b ̄b de- cay is reconstructed in the detector as a single object with a two-prong substructure.</p> <p>This thesis describes the measurement of V H(H → b ̄b) in the boosted regime performed inclusively, as well as in bins of the vector boson trans- verse momentum, for p<sup>V</sup><sub>T</sub> ∈ [250,400[ GeV and p<sup>V</sup><sub>T</sub> ∈ [400,∞[ GeV. The interpretation of these measurements using the Effective Field Theory (EFT) framework is also discussed. The results are based on the full LHC Run 2 dataset collected by the ATLAS experiment, corresponding to an integrated luminosity of 139 fb<sup>−1</sup>. A very important component of this study is the correct identification of b-jets. A new calibration of the b-jet tagging algorithm at very high transverse momentum, which reduced the uncertainties for high-pT b-jets by 50%, is also included.</p> |
| spellingShingle | Particle beams, Colliding Foti, MG Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title | Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title_full | Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title_fullStr | Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title_full_unstemmed | Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title_short | Study of a highly boosted Higgs boson decaying to b-jets final states with the ATLAS experiment at CERN |
| title_sort | study of a highly boosted higgs boson decaying to b jets final states with the atlas experiment at cern |
| topic | Particle beams, Colliding |
| work_keys_str_mv | AT fotimg studyofahighlyboostedhiggsbosondecayingtobjetsfinalstateswiththeatlasexperimentatcern |