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Mass reconstruction techniques in di-Higgs events with τ-leptons and b-quarks in the ATLAS experiment at the LHC
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis, two methods for reconstructing a neutral CP-even scalar are compared in the search for hhbbττ events in the ATLAS experiment at the Large Hadron Collider. Both methods aim at reconstructing the Higgs boson mass when the two τ-leptons decay either semi-leptonically or hadronically. Both the non-resonant di-Higgs production and the search for a resonance X → hh have been considered. The currently most used method, the Missing Mass Calculator (MMC), is found to be superior in terms of resolution and computing time compared to the newly developed Matrix Oriented Sampling Calculator (MOSAIC).

Abstract [sv]

I detta arbete har två olika metoder jämförts för att rekonstruera massan hos en Higgs-liknande partikel när den sönderfaller till två b-kvarar och två τ-leptoner vid ATLAS-experimentet vid LHC. De båda metoderna försöker rekonstruera Higgs-bosonens massa när τ-leptonerna sönderfaller semi-leptonskt eller hadroniskt. När metoderna har jämförts har simulerad data använts både för den vanliga Higgs-bosonen och data för en  tyngre Higgs-liknande partikel. Den nu mest använda metoden, MMC, visade sig vara överlägsen i både beräkningstid och precision i den uppskattade massan jämfört med den nyligen utvecklade metoden MOSAIC.

Place, publisher, year, edition, pages
2016.
Series
UPTEC F, ISSN 1401-5757 ; 16026
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-310314OAI: oai:DiVA.org:uu-310314DiVA, id: diva2:1056072
Educational program
Master Programme in Engineering Physics
Supervisors
Examiners
Available from: 2016-12-19 Created: 2016-12-13 Last updated: 2016-12-19Bibliographically approved

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CiteExportLink to record
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