Unit:
Κατεύθυνση Πυρηνική Φυσική και Φυσική Στοιχειωδών ΣωματιδίωνLibrary of the School of Science
Author:
Iosifidou Polytimi
Supervisors info:
N. Saoulidou, Assoc. Prof., Department of Physics, NKUA
K. Theofilatos, Assoc. Prof., Department of Physics, NKUA
I. Papadimitriou, Asst. Prof., Department of Physics, NKUA
Original Title:
Study of Trigger Efficiencies and Scale Factors in the Dilepton and Semilepton channel of the t̅tH, H→bbbar process using Run II Legacy Data and MC samples from the CMS experiment at Cern
Translated title:
DepartmenStudy of Trigger Efficiencies and Scale Factors in the Dilepton and Semilepton channel of the t̅tH, H→bbbar process using Run II Legacy Data and MC samples from the CMS experiment at Cern
Summary:
The CMS experiment at the Large Hadron Collider (LHC) represents a cornerstone of
high-energy physics research, pushing the boundaries of our understanding of
fundamental particles and their interactions. Among its various channels, the t̅ tH +
H(bb̅ ) channel holds particular significance due to its potential to shed light on the
Yukawa coupling between the top quark and the Higgs boson. In this context, the
leptonic channels within the t̅ tH + H(bb̅ ) channel present a compelling avenue for
investigation, offering reduced background noise and providing a clearer signal for
studying the interactions between the top quark and the Higgs boson. However, to
conduct these studies effectively, it is crucial to account for the leptonic Trigger Scale
Factors (SFs), which bridge the gap between experimental data and Monte Carlo
(MC) simulations. This thesis focuses on the calculation of lepton trigger SFs for both
the semileptonic and dilepton channels for the Legacy datasets of 2018 and 2017.
These SFs play a critical role in ensuring the accuracy of our analyses by accounting
for discrepancies between observed data and simulated events in the trigger selection
process. The development of our study involved the implementation of a new
columnar analysis framework called Pocket Coffea. This innovative approach offers
enhanced computational efficiency, enabling quicker and more effective calculations.
Such advancements are particularly vital in anticipation of future runs at the LHC and
the prospect of the High-Luminosity LHC upgrade, which will yield a vast amount of
data to be analyzed, and necessitate more sophisticated and efficient analysis tools.
Main subject category:
Science
Keywords:
CMS, trigger efficiency, scale factors, Higgs, ttHbb, CERN, dileptonic, semileptonic
File:
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Thesis_PI_v5.pdf
5 MB
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