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Decays
Name
PhysRevLett.124.041801.pdf
Description
Published version
Size
1.41 MB
Format
Adobe PDF
Checksum (MD5)
5b3bd53b76ca7b315f5837ab46528c11
Date Issued
October 15, 2019
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
Searches are performed for both prompt-like and long-lived dark photons,
$A'$, produced in proton-proton collisions at a center-of-mass energy of 13
TeV. These searches look for $A'\!\to\!\mu^+\mu^-$ decays using a data sample
corresponding to an integrated luminosity of 5.5/fb collected with the LHCb
detector. Neither search finds evidence for a signal, and 90% confidence-level
exclusion limits are placed on the $\gamma$-$A'$ kinetic-mixing strength. The
prompt-like $A'$ search explores the mass region from near the dimuon threshold
up to 70 GeV, and places the most stringent constraints to date on dark photons
with $214 < m(A') \lesssim 740$ MeV and $10.6 < m(A') \lesssim 30$ GeV. The
search for long-lived $A'\!\to\!\mu^+\mu^-$ decays places world-leading
constraints on low-mass dark photons with lifetimes $\mathcal{O}(1)$ ps.
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1103/physrevlett.124.041801
