2024/11/22 by Songshaptak De, De, Songshaptak, Atri Dey +3 · 3 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2411.14910
openalex publication_date 2024/11/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The search for heavy W' bosons in their decay modes to a lepton and a heavy neutrino offers a promising avenue for probing new physics beyond the Standard Model. This work focuses on such a signature with an energetic lepton plus a fat jet, originating from the heavy neutrino and containing a lepton. We have employed the jet substructure techniques to isolate the embedded lepton as a subjet of the fat jet. The Lepton Subjet Fraction (LSF) and Lepton Mass Drop (LMD) variables constructed from the lepton subjet help in separating the signal region from the background. We further study the polarization properties of the W' coupling to the lepton and heavy neutrino through the decay products of the neutrino. Instead of relying on a specific model, we employ generic couplings and explore the discrimination power. Jet substructure-based angular variables z_ℓ, zθ, and zk are combined to form BDT scores to obtain better separation power between left-chiral (V-A) and right-chiral (V+A) coupling configurations. By using CLs type profile likelihood estimator, we could achieve ∼ 2σ - 3σ significance of excluding one coupling configuration in favour of the other.