Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10723254 | Physics Letters B | 2012 | 5 Pages |
Abstract
Several models of dark matter motivate the concept of hidden sectors consisting of SU(3)CÃSU(2)LÃU(1)Y singlet fields. The interaction between our and hidden matter could be transmitted by new abelian Uâ²(1) gauge bosons Aâ² mixing with ordinary photons. If such Aâ²Ê¼s with the mass in the sub-GeV range exist, they would be produced through mixing with photons emitted in decays of η and ηⲠneutral mesons generated by the high energy proton beam in a neutrino target. The Aâ²Ê¼s would then penetrate the downstream shielding and be observed in a neutrino detector via their Aâ²âe+eâ decays. Using bounds from the CHARM neutrino experiment at CERN that searched for an excess of e+eâ pairs from heavy neutrino decays, the area excluding the γâAâ² mixing range 10â7â²Ïµâ²10â4 for the Aâ² mass region 1â²MAâ²â²500 MeV is derived. The obtained results are also used to constrain models, where a new gauge boson X interacts with quarks and leptons. New upper limits on the branching ratio as small as Br(ηâγX)â²10â14 and Br(ηâ²âγX)â²10â12 are obtained, which are several orders of magnitude more restrictive than the previous bounds from the Crystal Barrel experiment.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
S.N. Gninenko,