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Title: Search for vector mediator of dark matter production in invisible decay mode
Authors: Banerjee, D.
Crivelli, Paolo
Burtsev, Vitaly Evgenjevich
Chumakov, Aleksandr Grigorjevich
Dusaev, Renat Ramilyevich
Lyubovitskiy (Lyubovitskij), Valery Efimovich
Trifonov, Andrey Yurievich
Vasilishin, Bogdan Ivanovich
Keywords: нелептонные распады; векторные методы; медиаторы
Issue Date: 2018
Publisher: Томский политехнический университет
Citation: Search for vector mediator of dark matter production in invisible decay mode / D. Banerjee [et al.] // Physical Review D. — 2018. — Vol. 97, iss. 7. — [072002, 22 p.].
Abstract: A search is performed for a new sub-GeV vector boson (A′) mediated production of dark matter (χ) in the fixed-target experiment, NA64, at the CERN SPS. The A′, called dark photon, can be generated in the reaction e−Z→e−ZA′ of 100 GeV electrons dumped against an active target followed by its prompt invisible decay A′→χ¯χ. The experimental signature of this process would be an event with an isolated electron and large missing energy in the detector. From the analysis of the data sample collected in 2016 corresponding to 4.3×1010 electrons on target no evidence of such a process has been found. New stringent constraints on the A′ mixing strength with photons, 10−5≲ε≲10−2, for the A′ mass range mA′≲1  GeV are derived. For models considering scalar and fermionic thermal dark matter interacting with the visible sector through the vector portal the 90% C.L. limits 10−11≲y≲10−6on the dark-matter parameter y=ε2αD(mχmA′)4 are obtained for the dark coupling constant αD=0.5and dark-matter masses 0.001≲mχ≲0.5  GeV. The lower limits αD≳10−3 for pseudo-Dirac dark matter in the mass region mχ≲0.05  GeV are more stringent than the corresponding bounds from beam dump experiments. The results are obtained by using exact tree level calculations of the A′production cross sections, which turn out to be significantly smaller compared to the one obtained in the Weizsäcker-Williams approximation for the mass region mA′≳0.1  GeV
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