Limit on the production of a low-mass vector boson in e(+)e(-) -> U gamma, U -> e(+)e(-) with the KLOE experiment
2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 750, 633-637 p.Article in journal (Refereed) PublishedText
The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DA Phi NE e(+)e(-) collider. Using an integrated luminosity of 1.54 fb(-1), we studied the process e(+)e(-) -> U gamma, with U -> e(+)e(-), using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, epsilon(2), at 10(-6)-10(-4) in the 5-520 MeV/c(2) mass range.
Place, publisher, year, edition, pages
2015. Vol. 750, 633-637 p.
Dark matter, Dark forces, Dark photon, U boson, A '
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-270452DOI: 10.1016/j.physletb.2015.10.003ISI: 000364250600095OAI: oai:DiVA.org:uu-270452DiVA: diva2:895720