New Exclusion Limits on Dark Gauge Forces from Proton Bremsstrahlung in Beam-Dump Data

2013/11/15 by J. Blümlein, J. Brunner · 3 citations
Physics and Astronomy · #hep-ph #astro-ph.HE #hep-ex

paper · pdf · doi:10.1016/j.physletb.2014.02.029

14 pages, 6 figures

arxiv created 2013/11/15 · arxiv updated 2014/03/05

Abstract

We re-analyze published proton beam dump data taken at the U70 accelerator at IHEP Serpukhov with the ν-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. \citeBlumlein:1990ay,Blumlein:1991xh before. More recently, limits on dark gauge forces have been derived from this data set, considering a dark photon production from π⁰-decay \citeBlumlein:2011mv. Here we determine extended mass and coupling exclusion bounds for dark gauge bosons ranging to masses m_γ' of 624 MeV at admixture parameters ε ≃ 10^-6 considering high-energy Bremsstrahlung of the U-boson off the initial proton beam and different detection mechanisms.

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