Authors:	Backens, Johannes Vanderhaeghen, Marc
Title:	X17 discovery potential in the γN → e + e − N process at electron scattering facilities
Online publication date:	3-May-2023
Year of first publication:	2022
Language:	english
Abstract:	We propose a direct search for the X17 particle, which was conjectured to explain the ATOMKI 8 Be and 4 He anomalies, through the dilepton photoproduction process on a nucleon in the photon energy range below or around the pion production threshold. For the scenarios of either pseudoscalar, vector, or axial-vector quantum numbers of the conjectured X17, we use existing constraints to estimate the X17 signal process. For dilepton invariant mass resolutions which have been achieved in previous experiments, a signal-to-background ratio of up to an order of magnitude is found for a neutron target, and, in particular, for the pseudoscalar and vector X17 scenarios.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8907
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Physical Review Letters 128
Pages or article number:	091802
Publisher:	American Physical Society
Publisher place:	College Park, Md
Issue date:	2022
ISSN:	1079-7114
Publisher DOI:	10.1103/physrevlett.128.091802
Appears in collections:	DFG-491381577-H