Dark Photon from Light Scalar Boson Decays at FASER
Takeshi Araki, Kento Asai, Hidetoshi Otono, Takashi Shimomura, Yosuke, Takubo
TL;DR
This paper investigates the detection prospects of dark photons produced from light scalar boson decays at FASER, highlighting an expanded parameter space for potential discovery beyond previous research.
Contribution
It introduces a novel analysis of dark photon signals from U(1)-breaking scalar decays, extending the sensitivity range of FASER for these particles.
Findings
A sizable number of dark photon signatures can be detected at FASER.
The parameter space for dark photon detection is broader than previously estimated.
FASER's sensitivity to dark photons from scalar decays surpasses earlier studies.
Abstract
FASER is one of the promising experiments which search for long-lived particles beyond the Standard Model. In this paper, we focus on dark photon associating with an additional U(1) gauge symmetry, and also a scalar boson breaking this U(1) gauge symmetry. We study the sensitivity to the dark photon originated from U(1)-breaking scalar decays. We find that a sizable number of dark photon signatures can be expected in wider parameter space than previous studies.
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