arXiv : Dark matter search in missing energy events with NA64

Banerjee, D.; Mikhailov, Yu V.; Krasnikov, N.V.; Lyubovitskij, V.E.; Vasquez Arenas, G.; Rojas, R.; Depero, E.; Tikhomirov, V.O.; Tlisova, I.; Volkov, P.V.; Rubbia, A.; Jeckel, M.; Enik, T.; Ketzer, B.; Frolov, V.N.; Toropin, A.N.; Samoylenko, V.D.; Kuleshov, S.V.; Kravchuk, L.V.; Konorov, I.V.; Tlisov, D.A.; Matveev, V.A.; Crivelli, P.; Feshchenko, A.; Gardikiotis, A.; Hösgen, M.; Vasilishin, B.I.; Radics, B.; Donskov, S.V.; Molina Bueno, L.; Polyakov, V.A.; Shchukin, D.; Kekelidze, G.; Kirsanov, M.M.; Kovalenko, S.G.; Volkov, V.Yu.; Karneyeu, A.E.; Chumakov, A.G.; Kramarenko, V.A.; Gerassimov, S.G.; Burtsev, V.E.; Lysan, V.; Ulloa, P.; Charitonidis, N.; Kirpichnikov, D.V.; Dusaev, R.R.; Dermenev, A.V.; Gninenko, S.N.; Trifonov, A. Yu.; Cooke, D.; Peshekhonov, D.V.

doi:10.1103/PhysRevLett.123.121801

Article
Report number	arXiv:1906.00176 ; CERN-EP-2019-116
Title	Dark matter search in missing energy events with NA64
Author(s)	Banerjee, D. (CERN ; Illinois U., Urbana (main)) ; Burtsev, V.E. (Dubna, JINR) ; Chumakov, A.G. (Tomsk Pedagogical Inst.) ; Cooke, D. (Zurich, ETH) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Moscow, INR) ; Donskov, S.V. (Serpukhov, IHEP) ; Dusaev, R.R. (Tomsk Pedagogical Inst.) ; Enik, T. (Dubna, JINR) ; Charitonidis, N. (CERN) ; Feshchenko, A. (Dubna, JINR) ; Frolov, V.N. (Dubna, JINR) ; Gardikiotis, A. (Patras U.) ; Gerassimov, S.G. (Munich, Tech. U. ; Lebedev Inst.) ; Gninenko, S.N. (Moscow, INR) ; Hösgen, M. (Bonn U., HISKP) ; Jeckel, M. (CERN) ; Karneyeu, A.E. (Moscow, INR) ; Kekelidze, G. (Dubna, JINR) ; Ketzer, B. (Bonn U., HISKP) ; Kirpichnikov, D.V. (Moscow, INR) ; Kirsanov, M.M. (Moscow, INR) ; Konorov, I.V. (Munich, Tech. U. ; Lebedev Inst.) ; Kovalenko, S.G. (Valparaiso U.) ; Kramarenko, V.A. (Dubna, JINR ; SINP, Moscow) ; Kravchuk, L.V. (Moscow, INR) ; Krasnikov, N.V. (Dubna, JINR ; Moscow, INR) ; Kuleshov, S.V. (Andres Bello Natl. U.) ; Lyubovitskij, V.E. (Tomsk Pedagogical Inst. ; CCTVal, Valparaiso) ; Lysan, V. (Dubna, JINR) ; Matveev, V.A. (Dubna, JINR) ; Mikhailov, Yu V. (Serpukhov, IHEP) ; Molina Bueno, L. (Zurich, ETH) ; Peshekhonov, D.V. (Dubna, JINR) ; Polyakov, V.A. (Serpukhov, IHEP) ; Radics, B. (Zurich, ETH) ; Rojas, R. (Valparaiso U.) ; Rubbia, A. (Zurich, ETH) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Shchukin, D. (Lebedev Inst.) ; Tikhomirov, V.O. (Lebedev Inst.) ; Tlisova, I. (Moscow, INR) ; Tlisov, D.A. (Moscow, INR) ; Toropin, A.N. (Moscow, INR) ; Trifonov, A. Yu. (Tomsk Pedagogical Inst.) ; Vasilishin, B.I. (Tomsk Pedagogical Inst.) ; Vasquez Arenas, G. (Valparaiso U.) ; Volkov, P.V. (Dubna, JINR ; SINP, Moscow) ; Volkov, V.Yu. (SINP, Moscow) ; Ulloa, P. (Valparaiso U.)
Publication	2019-09-19
Imprint	2019-06-01
Number of pages	7
Note	6 pages, 4 figures, version accepted for publication in Phys. Rev. Lett. arXiv admin note: text overlap with arXiv:1710.00971, arXiv:1610.02988
In:	Phys. Rev. Lett. 123 (2019) 121801
DOI	10.1103/PhysRevLett.123.121801 (publication)
Subject category	hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA64
Abstract	A search for sub-GeV dark matter production mediated by a new vector boson $A'$, called dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS. From the analysis of the data collected in the years 2016, 2017, and 2018 with $2.84\times10^{11}$ electrons on target no evidence of such a process has been found. The most stringent constraints on the $A'$ mixing strength with photons and the parameter space for the scalar and fermionic dark matter in the mass range $\lesssim 0.2$ GeV are derived, thus demonstrating the power of the active beam dump approach for the dark matter search.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2019-2024 authors (License: CC-BY-4.0)

$The left panel shows the measured distribution of events in the ($E_{ECAL}$;$E_{HCAL}$) plane from the combined run data at the earlier phase of the analysis. The right panel shows the same distribution after applying all selection criteria. The shaded area is the signal box, which contains no events. The size of the signal box along the $E_{HCAL}$ axis is increased by a factor of 5 for illustration purposes. The side bands $A$ and $C$ are the ones used for the background estimate inside the signal region.$ $The NA64 90\% C.L. exclusion region in the ($m_{A'}, \epsilon$) plane. Constraints from the E787 and E949 \cite{hd,Essig:2013vha}, $BABAR$ \cite{babarg-2} and recent NA62 \cite{na62} experiments, as well as the muon $\alpha_\mu$ favored area are also shown. For more limits from indirect searches and planned measurements; see, e.g., Refs. \cite{report1,report2, pbc-bsm}.$ $Schematic illustration of the setup to search for $\ainv$ decays of the bremsstrahlung $A'$s produced in the reaction $eZ\rightarrow eZ A'$ of 100 GeV $e^-$ incident on the active ECAL target.$ Show more plots

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