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Title: Revisiting the dark photon explanation of the muon anomalous magnetic moment

Abstract

A massive U(1)' gauge boson known as a "dark photon" or A', has long been proposed as a potential explanation for the discrepancy observed between the experimental measurement and theoretical determination of the anomalous magnetic moment of the muon, (g μ-2) anomaly. Recently, experimental results have excluded this possibility for a dark photon exhibiting exclusively visible or invisible decays. Here, we revisit this idea and consider a model where A' couples inelastically to dark matter and an excited dark sector state, leading to a more exotic decay topology we refer to as a semi-visible decay. We show that for large mass splittings between the dark sector states this decay mode is enhanced, weakening the previous invisibly decaying dark photon bounds. As a result, A' resolves the g μ-2 anomaly in a region of parameter space the thermal dark matter component of the Universe is readily explained. Interestingly, it is possible that the semi-visible events we discuss may have been vetoed by experiments searching for invisible dark photon decays. A re-analysis of the data and future searches may be important in uncovering this exotic decay mode or closing the window on the dark photon explanation of the g μ-2 anomaly.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1524112
Alternate Identifier(s):
OSTI ID: 1543394
Report Number(s):
BNL-211850-2019-JAAM
Journal ID: ISSN 2470-0010; PRVDAQ
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 99; Journal Issue: 11; 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; gauge; photon; decay; anomaly; dark; muon

Citation Formats

Mohlabeng, Gopolang. Revisiting the dark photon explanation of the muon anomalous magnetic moment. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.99.115001.
Mohlabeng, Gopolang. Revisiting the dark photon explanation of the muon anomalous magnetic moment. United States. doi:10.1103/PhysRevD.99.115001.
Mohlabeng, Gopolang. Mon . "Revisiting the dark photon explanation of the muon anomalous magnetic moment". United States. doi:10.1103/PhysRevD.99.115001.
@article{osti_1524112,
title = {Revisiting the dark photon explanation of the muon anomalous magnetic moment},
author = {Mohlabeng, Gopolang},
abstractNote = {A massive U(1)' gauge boson known as a "dark photon" or A', has long been proposed as a potential explanation for the discrepancy observed between the experimental measurement and theoretical determination of the anomalous magnetic moment of the muon, (gμ-2) anomaly. Recently, experimental results have excluded this possibility for a dark photon exhibiting exclusively visible or invisible decays. Here, we revisit this idea and consider a model where A' couples inelastically to dark matter and an excited dark sector state, leading to a more exotic decay topology we refer to as a semi-visible decay. We show that for large mass splittings between the dark sector states this decay mode is enhanced, weakening the previous invisibly decaying dark photon bounds. As a result, A' resolves the gμ-2 anomaly in a region of parameter space the thermal dark matter component of the Universe is readily explained. Interestingly, it is possible that the semi-visible events we discuss may have been vetoed by experiments searching for invisible dark photon decays. A re-analysis of the data and future searches may be important in uncovering this exotic decay mode or closing the window on the dark photon explanation of the gμ-2 anomaly.},
doi = {10.1103/PhysRevD.99.115001},
journal = {Physical Review D},
number = 11,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.99.115001

Citation Metrics:
Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Schematic diagram of dark photon decays in our scenario. Here the Amore » $'$ decays promptly to both visible and invisible particles, thereby evading the A$'$ → $\bar{f}$$f$ resonance searches (where $f$ is a charged SM fermion) and missing energy searches for A$'$ → invisible decays.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.