ttH Undergraduate Project

Production of a top-quark pair in association with a Higgs-boson, where the Higgs-boson decays into a b-quark pair

One of the important physics goals of the Large Hadron Collider is to study the characteristics of the Higgs boson, for example its coupling to other fundamental particles. Being the heaviest quark, the top quark has the strongest coupling to the Higgs boson (Yukawa-coupling) and so the measurement of this coupling is therefore one of the most interesting tests of the Standard Model Higgs Boson. This coupling can be probed by studying the producton of Higgs bosons in association with top-quark pairs; the ttH channel. This channel is very challenging, since it suffers from large backgrounds (background: events with different production processes, that can look similar to the signal). The main background is the production of a top-quark pair with an additional b-quark pair, since it has exactly the same final state particles (irreducible background). The discrimination of ttH- and ttbb-events is therefore of the utmost importance to the sensitivity of the ttH channel. This summer project focuses on investigating the use of Machine Learning techniques to improve the signal/background separation.

Useful Links and Resources

ttH observation using a combination of Higgs decay channels:

ATLAS "Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector" paper from 2018:

CMS "Observation of ttH production" paper from 2018:

CERN LHC seminar on "New CMS measurements of Higgs boson production and decay properties" including ttH Observation (with video recording):

Most recent ATLAS results for ttH with Higgs→bb:

ATLAS Paper from 2017: "Search for the Standard Model Higgs boson produced in association with top quarks and decaying into a bb pair in pp collisions at √s = 13 TeV with the ATLAS detector":

CERN seminar on ATLAS Evidence for ttH production (with video recording):

LHC data analysis

"From Raw Data to Physics results" CERN Summer student lecture recordings: [1] [2] [3]

CERN Summer students ROOT introductory workshop (particularly the video recording):

CERN ROOT introductory tutorial:

Topic revision: r4 - 2018-10-01 - SarahBoutle
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