%0 Journal Article
%T New Exclusion Limits on Dark Gauge Forces from Proton Bremsstrahlung in Beam-Dump Data
%A J. Bl¨ımlein
%A J. Brunner
%J Physics
%D 2013
%I arXiv
%R 10.1016/j.physletb.2014.02.029
%X We re-analyze published proton beam dump data taken at the U70 accelerator at IHEP Serpukhov with the $\nu$-calorimeter I experiment in 1989 to set mass-coupling limits for dark gauge forces. The corresponding data have been used for axion and light Higgs particle searches in Refs. \cite{Blumlein:1990ay,Blumlein:1991xh} before. More recently, limits on dark gauge forces have been derived from this data set, considering a dark photon production from $\pi^0$-decay \cite{Blumlein:2011mv}. Here we determine extended mass and coupling exclusion bounds for dark gauge bosons ranging to masses $m_{\gamma'}$ of 624 MeV at admixture parameters $\varepsilon \simeq 10^{-6}$ considering high-energy Bremsstrahlung of the $U$-boson off the initial proton beam and different detection mechanisms.
%U http://arxiv.org/abs/1311.3870v1