Mass distributions of dijet resonances from excited quarks at proton-proton colliders

TL;DR

This paper analyzes the expected shapes and features of dijet resonance mass distributions from excited quarks across various proton-proton collider energies, highlighting universal behaviors and experimental considerations.

Contribution

It provides a detailed study of dijet resonance mass distributions from excited quarks, including effects of natural width, parton distributions, radiation, and resolution, across multiple energies.

Findings

Dijet mass distributions show approximate invariance for resonance masses between 10% and 50% of sqrt(s).

The study identifies the impact of natural width, parton distributions, radiation, and resolution on the distributions.

Universal behavior of distributions supports collider sensitivity studies for excited quark searches.

Abstract

We study the expected experimental mass distributions of dijet resonances from excited quarks in proton-proton collisions at energies $\sqrt{s}=$ 13, 14, 27, 100, 300, and 500 TeV. We explore in detail the expected shapes at both the generator and experimental levels, and identify within the distributions the effects of the excited quark natural width, parton momentum distributions of the proton, radiation, and experimental resolution. We present both differential and cumulative probability distributions as a function of dijet mass, and the signal acceptance of a window in dijet mass centered on each resonance. We find that for a range of resonance masses, between 10\% and 50\% of $\sqrt{s}$, the dijet mass distributions and window acceptance are practically universal, approximately invariant under changes in resonance mass and $\sqrt{s}$. This work supports our Snowmass 2021 study on the sensitivity to dijet resonances at proton-proton colliders.