A Beauty-ful Boson - Di Gregorio, Giulia
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The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics.
The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of s = 13 TeV. The same dataset has been used to perform the…mehr

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Produktbeschreibung
The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics.

The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of s = 13 TeV. The same dataset has been used to perform the differential pp ZH and pp WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects.

Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the dibosonand the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Autorenporträt
Giulia Di Gregori is a particle physics researcher originally from Italy. She obtained her Bachelor's degree in Physics and her Master's degree in Physics of Fundamental Interactions at the University of Pisa. During her Master's degree she was selected for the CERN Summer Student Programme, which was her first involvement in high energy physics. Once graduated, she decided to approach the work on the ATLAS data analysis and began her PhD at the University of Pisa. Her PhD research was on the Higgs sector, in particular on the associated production of a vector boson, decaying leptonically, and of a Higgs boson, decaying into a pair of b-quarks. Giulia is currently working as a postdoctoral researcher in the ATLAS experiment at the University of Pisa.