Search for tt̄H production in the H --> bb̄ decay channel / Marcel Rieger.

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Search for tt̄H production in the H --> bb̄ decay channel / Marcel Rieger.

9783030653804 (electronic bk.)
3030653803 (electronic bk.)
303065379X
9783030653798

Cham : Springer, [2021]

English

1 online resource.

10.1007/978-3-030-65380-4 doi

QC793.5.B625

539.7/21

In 1964, a mechanism explaining the origin of particle masses was proposed by Robert Brout, Francois Englert, and Peter W. Higgs. 48 years later, in 2012, the so-called Higgs boson was discovered in proton-proton collisions recorded by experiments at the LHC. Since then, its ability to interact with quarks remained experimentally unconfirmed. This book presents a search for Higgs bosons produced in association with top quarks ttH in data recorded with the CMS detector in 2016. It focuses on Higgs boson decays into bottom quarks H bb and top quark pair decays involving at least one lepton. In this analysis, a multiclass classification approach using deep learning techniques was applied for the first time. In light of the dominant background contribution from tt production, the developed method proved to achieve superior sensitivity with respect to existing techniques. In combination with searches in different decay channels, the presented work contributed to the first observations of ttH production and H bb decays.

"Doctoral thesis accepted by RWTH Aachen University, Aachen, Germany."

Includes bibliographical references.

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Online resource; title from PDF title page (SpringerLink, viewed March 30, 2021).

Springer theses.

Print version: 9783030653798

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