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

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	New Physics Probes at Present/future Hadron Colliders Via Vh Production./
Author:	Englert, Philipp Thomas.
Description:	1 online resource (171 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	High energy physics. -
Online resource:	click for full text (PQDT)
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. - 1 online resource (171 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379868109Subjects--Topical Terms:

1180812
High energy physics.
Index Terms--Genre/Form:

554714
Electronic books.

New Physics Probes at Present/future Hadron Colliders Via Vh Production.
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502 $a Thesis (Ph.D.)--Humboldt Universitaet zu Berlin (Germany), 2023.
504 $a Includes bibliographical references
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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