Level 1 study of B0s →φφ →k+k−k+k− at the HL-LHC using Data Scouting

Ray, Sanchari (2025) Level 1 study of B0s →φφ →k+k−k+k− at the HL-LHC using Data Scouting. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Sanchari Ray (20MS166)) 20MS166_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

k+k−k+k− in the context of the High Luminosity LHC upgrade, with particular emphasis on its reconstruction at the Level 1 (L1) trigger. The analysis explores the feasibility of identifying this rare decay using two approaches: the L1 tracking system and PFObjects produced by the particle flow algorithm. A complete reconstruction chain is developed to form φ candidates from pairs of oppositely charged kaons, which are then combined to identify B0s candidates, all within the constraints of L1-level data. The study uses a tight baseline of event selection criteria- including vertex consistency, angular separation, and mass windows- to reduce background from pileup and combinatorics. Comparative evaluations are carried out between the L1 tracks and PFObjects in terms of reconstruction efficiency and background separability. The findings highlight the strength of the L1 Tracker in discriminating signal from background, underscoring its role in real time scouting of low mass, hadronic decays and contributing toward the long term goal of enabling fully hadronic triggers at the L1 stage in the CMS detector.

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