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Title: Axionlike particles at FASER: The LHC as a photon beam dump

Abstract

Here, the goal of ForwArd Search ExpeRiment (FASER) at the LHC is to discover light, weakly interacting particles with a small and inexpensive detector placed in the far-forward region of ATLAS or CMS. A promising location in an unused service tunnel 480 m downstream of the ATLAS interaction point (IP) has been identified. Previous studies have found that FASER has significant discovery potential for new particles produced at the IP, including dark photons, dark Higgs bosons, and heavy neutral leptons. In this study, we explore a qualitatively different, “beam dump” capability of FASER, in which the new particles are produced not at the IP, but through collisions in detector elements further downstream. In particular, we consider the discovery prospects for axionlike particles (ALPs) that couple to the standard model through the aγγ interaction. TeV-scale photons produced at the IP collide with the TAXN neutral particle absorber 130 m downstream, producing ALPs through the Primakoff process, and the ALPs then decay to two photons in FASER. We show that FASER can discover ALPs with masses ma~30–400 MeV and couplings gaγγ~10–6 – 10–3 GeV–1, and we discuss the ALP signal characteristics and detector requirements.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1471263
Alternate Identifier(s):
OSTI ID: 1483284
Grant/Contract Number:  
SC0013678; SC0010008
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Feng, Jonathan L., Galon, Iftah, Kling, Felix, and Trojanowski, Sebastian. Axionlike particles at FASER: The LHC as a photon beam dump. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.055021.
Feng, Jonathan L., Galon, Iftah, Kling, Felix, & Trojanowski, Sebastian. Axionlike particles at FASER: The LHC as a photon beam dump. United States. doi:10.1103/PhysRevD.98.055021.
Feng, Jonathan L., Galon, Iftah, Kling, Felix, and Trojanowski, Sebastian. Tue . "Axionlike particles at FASER: The LHC as a photon beam dump". United States. doi:10.1103/PhysRevD.98.055021.
@article{osti_1471263,
title = {Axionlike particles at FASER: The LHC as a photon beam dump},
author = {Feng, Jonathan L. and Galon, Iftah and Kling, Felix and Trojanowski, Sebastian},
abstractNote = {Here, the goal of ForwArd Search ExpeRiment (FASER) at the LHC is to discover light, weakly interacting particles with a small and inexpensive detector placed in the far-forward region of ATLAS or CMS. A promising location in an unused service tunnel 480 m downstream of the ATLAS interaction point (IP) has been identified. Previous studies have found that FASER has significant discovery potential for new particles produced at the IP, including dark photons, dark Higgs bosons, and heavy neutral leptons. In this study, we explore a qualitatively different, “beam dump” capability of FASER, in which the new particles are produced not at the IP, but through collisions in detector elements further downstream. In particular, we consider the discovery prospects for axionlike particles (ALPs) that couple to the standard model through the aγγ interaction. TeV-scale photons produced at the IP collide with the TAXN neutral particle absorber 130 m downstream, producing ALPs through the Primakoff process, and the ALPs then decay to two photons in FASER. We show that FASER can discover ALPs with masses ma~30–400 MeV and couplings gaγγ~10–6 – 10–3 GeV–1, and we discuss the ALP signal characteristics and detector requirements.},
doi = {10.1103/PhysRevD.98.055021},
journal = {Physical Review D},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.055021

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Cited by: 11 works
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