Search for short-lived particles produced in an electron beam dump

Bross, A.; Crisler, M.; Pordes, S.; Volk, J.; Errede, S.; Wrbanek, John D.

doi:10.1103/physrevlett.67.2942

Cited by 287 publications

(291 citation statements)

References 24 publications

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“…Current bounds already exist for a range of m φ and photon-φ mixing from Υ(3S) decay at BaBar [63], measurements of e and µ anomalous magnetic moments [64], the beam dump experiments at SLAC [65,66] and Fermilab [67], and dark photon searches at the Tevatron [68]. However, these experiments, while probing the same mass range as Eq.…”

Section: Discussionmentioning

confidence: 99%

Dark matter self-interactions and light force carriers

2010

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Recent observations from PAMELA, FERMI, and ATIC point to a new source of high energy cosmic rays. If these signals are due to annihilating dark matter, the annihilation cross section in the present day must be substantially larger than that necessary for thermal freeze-out in the early universe. A new force, mediated by a particle of mass O(100 MeV), leading to a velocity dependent annihilation cross section -a 'Sommerfeld enhancement' -has been proposed as a possible explanation. We point out that such models necessarily increase the dark matter (DM) self-scattering cross section, and use observational bounds on the amount of DM-DM scattering allowed in various astrophysical systems to place constraints on the mass and couplings of the light mediator.

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Section: Discussionmentioning

confidence: 99%

Dark matter self-interactions and light force carriers

2010

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“…From [14] one finds that F 100 GeV is allowed which corresponds, with Constraints from the additional electron beam dump experiments SLAC E141 [34] and Fermilab E774 [35] do not apply for M A ∼ 17 MeV.…”

Section: Jhep11(2016)039mentioning

confidence: 99%

Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Ellwanger

Moretti

2016

J. High Energ. Phys.

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Abstract:We estimate the values of Yukawa couplings of a light pseudoscalar A with a mass of about 17 MeV, which would explain the 8 Be anomaly observed in the Atomki pair spectrometer experiment. The resulting couplings of A to up and down type quarks are about 0.3 times the coupling of the standard Higgs boson. Then constraints from K and B decays require that loop contributions to flavour changing vertices cancel at least at the 10% level. Constraints from beam dump experiments require the coupling of A to electrons to be larger than about 4 times the coupling of the standard Higgs boson, leading to a short enough A life time consistent with an explanation of the anomaly.

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“…This boson should be able to couple with strength ε 2 e to ordinary particles by means of kinetic mixing with the SM hypercharge field [27][28][29][30][31][32][33][34]. A tipical value for the kinetic mixing parameter ε is expected to be of the order 10 −3 [27,28,33,[35][36][37][38] so that observable effects can be induced at e + e − colliders [35,[39][40][41] and fixed target [42][43][44] or beam dump experiments [45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Dark Forces at KLOE/KLOE-2

Curciarello

2014

EPJ Web of Conferences

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Abstract. Searches for dark matter particles in the GeV mass range and for dark forces are strongly motivated by the numerous striking astrophysical observations recently reported by many experiments. Flavor factories, like the Frascati Φ-factory DAΦNE, are particularly suited to search for the light gauge vector boson, called U boson, which is thought to mediate an unknown interaction between hypothetical dark matter particles. By using the KLOE detector, limits on U boson coupling factor ε 2 of the order of 10 −5 ÷ 10 −7 have been set through the study of the φ Dalitz decay, the Higgsstrahlung process and Uγ events. New experiments with the upgraded KLOE detector and the increased luminosity of DAΦNE are expected to improve the already set upper limits by a factor of two or better. a

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Search for short-lived particles produced in an electron beam dump

Abstract: A search for short-lived neutral particles which decay to electron-positron pairs has been carried out using a beam of 275-GeV electrons incident on an instrumented tungsten beam dump. The experiment was sensitive to particles up to 10 MeV/c 2 in mass and down to 4x 10" l6 sec in lifetime.

Cited by 287 publications

References 24 publications

Dark matter self-interactions and light force carriers

Dark matter self-interactions and light force carriers

Possible explanation of the electron positron anomaly at 17 MeV in 8 Be transitions through a light pseudoscalar

Dark Forces at KLOE/KLOE-2

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