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

By J. Blumlein, J. Brunner. 2013

281 citations recorded by the source corpus.

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. [1] , [2] before. More recently, limits on dark gauge forces have been derived from this data set, considering a dark photon production from π 0 -decay [3] . Here we determine extended mass and coupling exclusion bounds for dark gauge bosons ranging to masses m γ ′ of 624 MeV at admixture parameters e ≃ 10 − 6 considering high-energy Bremsstrahlung of the γ ′ -boson off the initial proton beam and different detection mechanisms.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/059f6fb3153a7774571675a1d3a4b1cce4613aef

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Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, background): “0.1 1 10 10010 - 9 10- 8 10- 7 10- 6 10- 5 10- 4 10- 3 Ki ne tic m ix in g pa ra m et er U70 E137 CHARM Phenix ATLAS (long-lived) KLOE SN LSND ɛ →h→2n1→2ɣD+2nD→4μ+Xpp 10% 40% 40% 40% 10% LHCb long-lived 35.9 fb-1 (13 TeV)CMS LHCbBaBar Orsay HADES 0.1% 1% 10% 40% ATLAS (prompt) CMS APEX/MAMI m [GeV]ɣ”
FASER’s physics reach for long-lived particles (2018, methodology): “This is typically modeled using the Fermi-Weizsacker-Williams approximation [50]; see, e.”
ALPtraum: ALP production in proton beam dump experiments (2015, methodology): “The two most constraining experiments are9 CHARM [12], which has recently been used to derive constraints on light scalars and pseudoscalars with couplings to quarks [33, 34], and NuCal [5], which has been reanalysed for the case of hidden photons [23, 24].”
A taste of dark matter: flavour constraints on pseudoscalar mediators (2014, unknown): “We have calculated the constraints from CHARM, following [72, 105] and estimated the implications of NuCal, following [106, 107].”
Particle physics models for the 17 MeV anomaly in beryllium nuclear decays (2016, background): “The ν-Cal I experiment at the U70 accelerator at IHEP sets bounds from X-bremsstrahlung off the initial proton beam [61] and π → Xγ decays [62].”
ForwArd Search ExpeRiment at the LHC (2017, methodology): “The validity conditions can be summarized as EA′ , Ep, Ep′ mA′ ,mp, pT in the rest frame of one of the protons [57].”
Serendipity in dark photon searches (2018, unknown): “2 Proton beam dumps Limits on A′ → e+e− decays have been set by the following experiments: ν-CAL I [119, 120], using π0 → A′γ decays [20] and proton bremsstrahlung [22]; CHARM [121], using η(′) → A′γ decays [21]; and NOMAD [17] and PS191 [33] using π0 → A′γ decays [36].”
A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “The (quasi)elestic scattering of incident protons on nucleons in the target can lead to the production of vector states via bremsstrahlung process pp → ppV [158, 159].”