DIFFERENTIAL CROSS SECTION MEASUREMENT OF GAMMA + B JETS AT 13 TEV AT CMS AT LHC

Date

2024-1-22

Author

Yalvaç, Metin

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An isolated photon associated with jets processes in proton-proton collisions at Large Hadron Collider(LHC) has a very important role in testing the Standard Model(SM). Production of these processes provides very good tests for perturbative Quantum Chromodynamics(QCD). They can also probe the partonic distributions of the protons. This thesis will focus on the processes of an isolated photon associated with b-quark jets, which will play a key role in the test of SM as well as provide information about the Parton Distribution Functions(PDF) of b-quarks and gluons. Different Monte Carlo(MC) generators are also tested to explain the experimental results with the theoretical expectations more precisely. In this thesis, the differential cross- section of γ + b-jets as a function of kinematic variables such as photon transverse momentum or photon η from proton-proton collisions at the LHC with the center of mass energy of 13 TeV. The measurements will be made for γ + 1b − jet and γ + 2b − jets processes from which the ratio of the γ + 2b − jets/γ + 1b − jet can be calculated. The ratio is expected to lead to a reduction in theoretical and experimental uncertainties. The data is taken during the Run II data-taking period of the Compact Muon Solenoid (CMS) experiment, which includes 2016, 2017, and 2018 data sets with a total integrated luminosity 137f b−1. The kinematic regions probed are 200GeV < photon pT < 1500GeV , |ηphoton| < 1.4442, JetspT > 100GeV and |ηJets| < 2.5.

Subject Keywords

Compact Muon Solenoid Experiment Run II analysis, Standard Model Physics, Quantum Chromo Dynamics, Photon plus b quark jets, Monte Carlo generators

URI

https://hdl.handle.net/11511/108822

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Graduate School of Natural and Applied Sciences, Thesis