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New Physics Probes at Present/future...

Englert, Philipp Thomas.

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New Physics Probes at Present/future Hadron Colliders Via Vh Production.

Record Type:	Electronic resources : Monograph/item
Title/Author:	New Physics Probes at Present/future Hadron Colliders Via Vh Production./
Author:	Englert, Philipp Thomas.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	171 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	High energy physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30509418
ISBN:	9798379868109

New Physics Probes at Present/future Hadron Colliders Via Vh Production.
Englert, Philipp Thomas.

New Physics Probes at Present/future Hadron Colliders Via Vh Production. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 171 p.

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--Humboldt Universitaet zu Berlin (Germany), 2023.

This item must not be sold to any third party vendors.

The endeavour to discover Beyond the Standard Model (BSM) physics persists for both present and future particle-physics experiments. In this thesis, we utilise the framework of Efective Field Theories, more specifcally the Standard Model Efective Field Theory, to parameterise New-Physics efects in a model-independent way.We demonstrate the relevance of precision measurements both at current and future hadron colliders by studying Vh-diboson-production processes, where V collectively denotes the vector bosons W± and Z. These processes allow us to probe a set of dimension-6 operators that generate BSM efects growing with the center-of-mass energy. More specifcally, we consider the leptonic decay channels of the vector bosons and two diferent decay modes of the Higgs boson, the diphoton channel h → γγ and the hadronic h → bbchannel.The diphoton channel is characterised by a clean signature that can be separated very well from the relevant backgrounds with relatively simple methods. However, due to the small rate of this Higgs-decay channel, these processes will only become viable to probe New-Physics efects at the FCC-hh. Thanks to the large h → bb branching ratio, the Vh(→ bb) channel already provides competitive sensitivity to BSM efects at the LHC. However, it sufers from large QCD-induced backgrounds that require us to use more sophisticated analysis techniques to achieve this level of BSM sensitivity. We derive the expected bounds on the previously mentioned dimension-6 operators from the V h(→ γγ) channel at the FCC-hh and from the Vh(→ bb) channel at the LHC Run 3, HL-LHC and FCC-hh.Our study of the Vh(→ bb) channel demonstrates that extracting bounds on BSM operators at hadron colliders can be a highly non-trivial task. We believe that it can be useful or, depending on the complexity of the event structure, even essential to employ modern analysis techniques in order to measure New-Physics efects. A particular class of such modern methods are Machine-Learning algorithms, which are becoming more and more popular in particle physics. We attempt to gauge their potential in the studies of the previously mentioned diboson-production processes by replacing our conventional cut-and-count analysis with boosted decision trees that use the kinematical information of a given event in order to classify it as signal or background event. We compare the bounds we derive using this analysis strategy with the ones from the conventional cut-and-count analysis and we fnd a mild improvement of O(few %) across the diferent operators.

ISBN: 9798379868109Subjects--Topical Terms:

2144759
High energy physics.

New Physics Probes at Present/future Hadron Colliders Via Vh Production.
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520 $a The endeavour to discover Beyond the Standard Model (BSM) physics persists for both present and future particle-physics experiments. In this thesis, we utilise the framework of Efective Field Theories, more specifcally the Standard Model Efective Field Theory, to parameterise New-Physics efects in a model-independent way.We demonstrate the relevance of precision measurements both at current and future hadron colliders by studying Vh-diboson-production processes, where V collectively denotes the vector bosons W± and Z. These processes allow us to probe a set of dimension-6 operators that generate BSM efects growing with the center-of-mass energy. More specifcally, we consider the leptonic decay channels of the vector bosons and two diferent decay modes of the Higgs boson, the diphoton channel h → γγ and the hadronic h → bbchannel.The diphoton channel is characterised by a clean signature that can be separated very well from the relevant backgrounds with relatively simple methods. However, due to the small rate of this Higgs-decay channel, these processes will only become viable to probe New-Physics efects at the FCC-hh. Thanks to the large h → bb branching ratio, the Vh(→ bb) channel already provides competitive sensitivity to BSM efects at the LHC. However, it sufers from large QCD-induced backgrounds that require us to use more sophisticated analysis techniques to achieve this level of BSM sensitivity. We derive the expected bounds on the previously mentioned dimension-6 operators from the V h(→ γγ) channel at the FCC-hh and from the Vh(→ bb) channel at the LHC Run 3, HL-LHC and FCC-hh.Our study of the Vh(→ bb) channel demonstrates that extracting bounds on BSM operators at hadron colliders can be a highly non-trivial task. We believe that it can be useful or, depending on the complexity of the event structure, even essential to employ modern analysis techniques in order to measure New-Physics efects. A particular class of such modern methods are Machine-Learning algorithms, which are becoming more and more popular in particle physics. We attempt to gauge their potential in the studies of the previously mentioned diboson-production processes by replacing our conventional cut-and-count analysis with boosted decision trees that use the kinematical information of a given event in order to classify it as signal or background event. We compare the bounds we derive using this analysis strategy with the ones from the conventional cut-and-count analysis and we fnd a mild improvement of O(few %) across the diferent operators.
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