Revisiting the dark photon explanation of the muon anomalous magnetic moment

Mohlabeng, Gopolang

doi:10.1103/PhysRevD.99.115001

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

Journal Article · Mon Jun 03 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.99.115001· OSTI ID:1524112

Mohlabeng, Gopolang

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012704

OSTI ID:: 1524112

Alternate ID(s):: OSTI ID: 1543394

Report Number(s):: BNL-211850-2019-JAAM; PRVDAQ; 115001

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 11; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Cited By (1)

Probing Muonphilic Force Carriers and Dark Matter at Kaon Factories Krnjaic, Gordan; Marques-Tavares, Gustavo; Redigolo, Diego Physical Review Letters, Vol. 124, Issue 4 https://doi.org/10.1103/physrevlett.124.041802	journal	January 2020

Figures / Tables (3)

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
gauge
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decay
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muon