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doctoral thesis
Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider
Zagreb: University of Zagreb, Faculty of Science, 2024. urn:nbn:hr:217:911256
Chitroda, Bhakti Kanulal
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

Cite this document

Chitroda, B. K. (2024). Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:911256

Chitroda, Bhakti Kanulal. "Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider." Doctoral thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:911256

Chitroda, Bhakti Kanulal. "Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider." Doctoral thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:911256

Chitroda, B. K. (2024). 'Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 28 March 2025, https://urn.nsk.hr/urn:nbn:hr:217:911256

Chitroda BK. Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2024 [cited 2025 March 28] Available at: https://urn.nsk.hr/urn:nbn:hr:217:911256

B. K. Chitroda, "Search for multiple Higgs boson production in hadronic final states at the Large Hadron Collider", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:217:911256

Metadata
TitleSearch for multiple Higgs boson production in hadronic final states at the Large Hadron Collider
Title (croatian)Potraga za višestrukom produkcijom Higgsovih bozona u hadronskim konačnim stanjima na Velikom hadronskom sudarivaču
AuthorBhakti Kanulal Chitroda
MentorDinko Ferenček (mentor)
Committee memberVuko Brigljević (predsjednik povjerenstva)
Committee memberNikola Poljak (član povjerenstva)
Committee memberIvica Friščić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2024-12-19, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Universal decimal classification
(UDC)		53 - Physics
Abstract
After the discovery of the Higgs boson, one of the main purposes of the physics program at the LHC has been a thorough characterization of its properties. Among important properties of Higgs lies trilinear and quartic Higgs self-coupling, accessible through di- Higgs and triple Higgs production respectively. This thesis primarily reports on two highly significant and intriguing studies that were performed utilizing data from the Run- 2(2016–2018) proton–proton collision at a center-of-mass... More energy of 13 TeV collected by the CMS experiment at the LHC. The first study concerns the search for the non-resonant H pair produced through gluon-gluon fusion (ggF) and Vector Boson Fusion (VBF) modes in two photons and two b-jets final state. The b￣bγγ final state is one of the most sensitive channels to the HH signal thanks to a relatively clean signature of two high-energy photons and large branching ratio of two heavy-flavor high-energy jets (b-jets). A 95% confidence level (CL) upper limit on the product of Higgs boson pair production cross section and branching fraction are derived as a function of κλ parameter. The constraints on the anomalous coupling of a pair of H with a pair of gauge bosons was determined for the first time by the CMS collaboration. The second study focuses on the search for triple Higgs boson production in three b-jet pairs final state. Given the extremely low standard model (SM) cross-section for triple- Higgs production, the Two-Real Singlet Model (TRSM) is considered as an extension of SM. TRSM introduces two real scalars X and Y, which decay to three SM Higgs bosons which decays further to three pair of b-quarks through the process X → Y H → HHH → b￣bb￣bb￣ b. The search is performed in mass ranges of X (1–4 TeV) and Y (300–2800 GeV) where the H is highly Lorentz-boosted. In this kinematic regime, decayed b-quark pairs are collimated enough to allow the reconstruction of H using single large-area jets. We have considered two topologies: one topology where all three Higgs bosons are boosted and another where two of the three Higgs bosons are boosted. This analysis is still ongoing. A scan will be performed in a two dimensional plane spanned by the invariant mass of the two large-area jets associated to Y, and the invariant mass of three large-area jets used to reconstruct X. Less
Abstract (english)
Rad ne sadrži sažetak na drugom jeziku.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:217:911256
Promotion2025
Study programmeTitle: Doctoral study
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti u području prirodnih znanosti (doktor/doktorica znanosti u području prirodnih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2025-01-21 12:39:31
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