Publication
Searching a Dark Photon with HADES
| dc.contributor.author | HADES collaboration (100 authors) | |
| dc.contributor.author | Blanco, A. | |
| dc.contributor.author | Fonte, P. | |
| dc.contributor.author | Lopes, L. | |
| dc.contributor.author | Mangiarotti, A. | |
| dc.date.accessioned | 2019-02-03T23:39:57Z | |
| dc.date.available | 2019-02-03T23:39:57Z | |
| dc.date.issued | 2014-04-04 | |
| dc.date.updated | 2019-02-03T23:39:57Z | |
| dc.description.abstract | We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon^{2} at 90% CL has been obtained for the mass range M(U) = 0.02 - 0.55 GeV/c2 and is compared with the present world data set. For masses 0.03 - 0.1 GeV/c^2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favoured by the muon g-2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 * 10^{-6} has been set on the helicity-suppressed direct decay of the eta meson, eta-> e+e-, at 90% CL. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Phys.Lett. B731 (2014) 265-271; DOI 10.1016/j.physletb.2014.02.035 | |
| dc.identifier.uri | http://dx.doi.org/10.1016/j.physletb.2014.02.035 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26495 | |
| dc.language.iso | eng | |
| dc.title | Searching a Dark Photon with HADES | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |