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19–23 Dec 2024
Swatantrata Bhavan, Banaras Hindu University, Varanasi
Asia/Kolkata timezone

A novel jet substructure approach to polarization measurement in boosted hadronic W bosons

Not scheduled
20m
Swatantrata Bhavan, Banaras Hindu University, Varanasi

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Department of Physics, I.Sc., Banaras Hindu University, 221005 Varanasi, India
Oral Top Quark and EW physics

Speaker

Dr Songshaptak De (Institute of Physics Bhubaneswar)

Description

In this work, we introduce a novel technique for measuring the longitudinal and transverse polarization fractions of boosted hadronic W boson decays. We propose a jet substructure observable, pθ, derived from subjet energies, serving as a proxy for the
W boson's parton-level decay polar angle in its rest-frame. This observable is sensitive to W boson polarization and offers lower reconstruction errors than existing proxies, especially for highly boosted W bosons. Looking forward to an optimistic scenario with 10ab1 of data at the High Luminosity LHC, our technique could achieve a 20% error in measuring the transverse W polarization fraction. Although detecting longitudinal polarization consistent with the Standard Model at the 2σ level may remain challenging, this method holds potential for identifying enhancements in Beyond Standard Model scenarios, thereby contributing to unitarity restoration studies.

Field of contribution Phenomenology

Authors

Dr Songshaptak De (Institute of Physics Bhubaneswar) Prof. Vikram Rentala (IIT Bombay) Prof. William Shepherd (Sam Houston State University)

Presentation materials

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