Study of Double Parton Scattering in Photon + 3 Jets Final State: In Proton-Proton Collisions at √s = 7TeV with the CMS experiment at the LHC

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Springer, Jan 20, 2017 - Science - 101 pages

This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at √s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS). A new method by using Monte Carlo generators was performed and provides higher order corrections to the description of the Single Parton Scattering (SPS) background. Further it is investigated whether additional contributions from DPS can improve the agreement between the measured data and the Monte Carlo predictions. The current theoretical uncertainties related to the SPS background are found to be larger than expectation. At the same time a rich set of DPS-sensitive measurements is reported for possible further interpretation.

 

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Contents

1 Introduction
1
2 Experimental Apparatus
6
3 Data and Monte Carlo Simulation
27
4 Event Selection
33
5 Discriminating Observables
45
6 Photon + 3 Jets Events at Detector Level
49
7 Correction and Unfolding
57
8 Systematic Uncertainties
64
9 Results
75
10 Conclusion
81
Appendix A KFactor Correction for the LO CrossSection of Pythia MadGraph and Sherpa MCs
83
Appendix B Study of Low Acceptance of Photon + 3 Jets Events
87
Appendix C More DPS Discriminating Observables
89
Curriculum Vitae
92
References
97
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About the author (2017)

You-Hao Chang received his master of science in physics from National Taiwan University (NTU) in 2009. He obtained his Ph.D. in physics from NTU in February 2016. His major research project in NTU high energy physics group was minimum bias and underlying event measurements in proton-proton collisions in Compact Muon Solenoid (CMS) experiment. Especially, his major work was to study the double parton scattering in CMS. In the meantime, he was also responsible for managing the NTU Tier-3 grid center.

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