DETERMINATION OF THE JET ENERGY SCALE CORRECTIONS FOR THE LOW PT JETS IN PROTON-PROTON COLLISIONS AT √s= 13 TeV WITH THE CMS EXPERIMENT

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Tezin Türü: Doktora

Tezin Yürütüldüğü Kurum: Çukurova Üniversitesi, Fen-Edebiyat Fakültesi, Fizik, Türkiye

Tezin Onay Tarihi: 2020

Tezin Dili: İngilizce

Öğrenci: Zühal Şeyma Demiroğlu

Danışman: Eda Eşkut

Özet:

 

            In this thesis, two analyses related to jet energy scale corrections focus on the low p_T region are performed. The first part of the thesis is dedicated to the Monte Carlo (MC) truth jet energy corrections for 2015 no pileup QCD PYTHIA8 sample. Particle-Flow Charged Hadron Subtraction (PFCHS) jets are reconstructed by using the anti-k_T clustering algorithm with the cone size parameters of 0.4. The study is performed in the pseudorapidity region of  and jet p_T region of  GeV. The second part presents the calibration of the jet energy scale with respect to residual differences between data and simulation after simulation-based pre-calibrations is applied. This correction is called as L2 relative residual jet energy correction. In this analysis,  = 13 TeV low pileup data of 2015 and PYTHIA8 MC samples are used. The correction factors depending on jet p_T and h are derived by using two different methods based on the dijet final states in the region of    pseudorapidity and  GeV. This will make an important contribution to the analysis to be performed using the low p_T jets in the physics analysis.

 

Key Words: CMS, Jet, Jet Energy Corrections, QCD, Low p_T