# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Measuring the polarization of boosted, hadronic $W$ bosons with jet substructure observables

26 Jul 2021, 10:45
15m
Zoom

#### Zoom

Parallel session talk Top and Electroweak Physics

### Speaker

Songshaptak De (IIT Bombay)

### Description

In this work, we present a new technique to measure the longitudinal and transverse polarization fractions of hadronic decays of boosted $W$ bosons. We introduce a new jet substructure observable denoted as $p_\theta$, which is a proxy for the parton level decay polar angle of the $W$ boson in its rest frame. We show that the distribution of this observable is sensitive to the polarization of $W$ bosons and can therefore be used to reconstruct the $W$ polarization in a model-independent way. As a test case, we study the efficacy of our technique on vector boson scattering processes at the high luminosity Large Hadron Collider and we find that our technique can determine the longitudinal polarization fraction to within $\pm 0.15$.

Email dingo1691sde@gmail.com Songshaptak De IIT Bombay

### Primary authors

Songshaptak De (IIT Bombay) Prof. Vikram Rentala (IIT Bombay) Prof. William Shepherd (Sam Houston State University)