Boost Asymmetry of the diboson productions in pp collisions

TL;DR

This paper introduces the boost asymmetry in diboson production at pp collisions as a novel observable that reveals detailed information about proton structure, especially quark and antiquark distributions, beyond current measurement capabilities.

Contribution

It proposes a new experimental observable, the boost asymmetry, which enhances understanding of proton parton densities by analyzing diboson kinematics in pp collisions.

Findings

Boost asymmetry correlates with quark and antiquark energy differences.

It provides insights into parton momentum fractions not accessible by current measurements.

The method can improve proton structure models.

Abstract

We propose the boost asymmetry of the diboson productions in pp collisions as a new experimental observable, which can provide unique information on the proton structure. The boost asymmetry rises as the difference in the kinematics of the two bosons, that are coupled to the two different quark and antiquark initial states, respectively, and thus reflects different features of the quark and antiquark parton densities. By comparing the kinematics of the two bosons, such as the boson energy or rapidity, the diboson events with antiquark having higher energy than quark can be distinguished from those with quark having higher energy than antiquark. This would provide unique information in some special parton momentum fraction regions, which cannot be directly proved by current W and Z measurements at the Large Hadron Collider or other deep inelastic scattering experients.