Springer : dE/dx from boosted long-lived particles

Giudice, Gian F.; McCullough, Matthew; Teresi, Daniele

doi:10.1007/JHEP08(2022)012

Article
Report number	arXiv:2205.04473 ; CERN-TH-2022-078
Title	dE/dx from boosted long-lived particles
Author(s)	Giudice, Gian F. (CERN) ; McCullough, Matthew (CERN) ; Teresi, Daniele (CERN)
Publication	2022-08-01
Imprint	2022-05-09
Number of pages	17
In:	JHEP 2208 (2022) 012
DOI	10.1007/JHEP08(2022)012
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	At colliders massive long-lived charged particles could be revealed through their anomalously large ionisation energy loss $dE/dx$. In this paper we explore a class of scenarios in which the LLPs are particularly boosted, owing to production from the decay of a heavy parent resonance. Such scenarios give rise to unique signatures as compared to traditionally considered $dE/dx$ new-physics benchmarks. We demonstrate that this class of models, unlike traditional new-physics theories, can explain the recently reported excess of events in the $dE/dx$ search by the ATLAS collaboration without conflicting with the determination of $\beta$ from ionisation and time-of-flight measurements.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2022-2024 The Authors (License: CC-BY-4.0), sponsored by SCOAP³

$Distribution of the $dE/dx$ signal as function of $\beta$ for unit and doubly charged particles. The continuous lines denote the most probable values \eqref{eq:dEdxMPV}. The simulated points are spread around it by the Crystal Ball distribution given in Appendix~\ref{app:calibration}. The grey bands indicate the regions of the ATLAS excess events, in particular their ionisation $dE/dx$ and $\beta \approx 1$, as suggested by time-of-flight measurements.$