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Charming Decays of the Higgs, Z, and W Bosons: Development and Deployment of a New Calibration Method for Charm Jet Identification by Spandan Mondal at Abbey's Bookshop,
Charming Decays of the Higgs, Z, and W Bosons: Development and Deployment of a New Calibration Method...
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Spandan Mondal

Charming Decays of the Higgs, Z, and W Bosons

Development and Deployment of a New Calibration Method for Charm Jet Identification

Spandan Mondal

$457.95   $366.05

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English
Springer International Publishing AG
13 May 2025
Particle & high-energy physics
Series: Springer Theses
This book presents searches for the Higgs boson, Z boson, and W boson decaying into charm quark(s) performed with proton-proton collision data at √s = 13TeV collected by the CMS experiment at the LHC, CERN, corresponding to an integrated luminosity of 138 fb−1 and recorded between 2016 and 2018. The searches are carried out using events in which the Higgs/Z/W boson is produced in association with a leptonically-decaying Z or W boson. This thesis also discusses a novel calibration algorithm for charm jet identification that enables maximal use of the available information related to charm jets. The new method is used to correct the entire distribution expected as output when jet flavour identification algorithms are applied to jets of different flavours. The calibrated results improve over traditional efficiency measurements and help enhance the sensitivities of the Higgs, Z, and W searches. This book primarily reports on the so-called resolved-jet topology of the Higgs/Z/W boson searches, where the boson candidates are reconstructed using two separate small-radius (AK4) jets. Upon statistically combining the results of the resolved-jet search with a complementary merged-jet approach, the observed (expected) upper limit on the Higgs decay to charm quarks corresponds to 14 (7.6) times the Standard Model expectation at the 95% CL which is the most stringent direct limit to date. A significance of 5.7σ (5.9σ) over the background-only prediction is observed (expected) in case of the search for charmed Z boson decays. Only the resolved-jet topology is used in the search for charmed W decays and the observed (expected) significance is 5.6σ (5.7σ) over the background-only prediction. These mark the first observations of charmed decays of the Z and W bosons at a hadron collider experiment.
By:  
Imprint:   Springer International Publishing AG
Country of Publication:   Switzerland
Dimensions:   Height: 235mm,  Width: 155mm, 
ISBN:   9783031846762
ISBN 10:   3031846761
Series:   Springer Theses
Pages:   160
Publication Date:  
Audience:   Professional and scholarly ,  College/higher education ,  Undergraduate ,  Further / Higher Education
Format:   Hardback
Publisher's Status:   Active

Spandan Mondal is currently a postdoctoral fellow in the Department of Physics at Brown University, working with the group led by Profs. Heintz and Barone. Within the CMS Collaboration, he serves as a convener of the flavor tagging physics group. His work focuses on developing new ML-based reconstruction and calibration methods for identifying heavy-flavor hadronic decays. Additionally, he continues to work on the search for the Higgs boson decaying into a charm quark-antiquark pair and explores other topics in Higgs physics, such as its production in the vector boson fusion and scattering modes, as well as its decay into leptonic final states. Spandan's goal is to extend the use of novel data analysis techniques across a broad range of studies within the CMS Collaboration.

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