Missing energy signature from invisible decays of dark photons at the CERN SPS

S. N. Gninenko, N. V. Krasnikov, M. M. Kirsanov, and D. V. Kirpichnikov
Phys. Rev. D 94, 095025 – Published 30 November 2016

Abstract

The dark photon (A) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible A decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for Ainvisible decays with a high-energy electron beam at the CERN SPS (The Super Proton Synchrotron). We show the distinctive distributions of variables that can be used to distinguish the Ainvisible signal from background. The results of the detailed simulation of the detector response for the events with and without A emission are presented. The efficiency of the signal event selection is estimated. It is used to evaluate the sensitivity of the experiment and show that it allows us to probe the still unexplored area of the mixing strength 106ε102 and masses up to MA1GeV. The results obtained are compared with the results from other calculations. In the case of the signal observation, a possibility of extraction of the parameters MA and ε by using the shape of the missing energy spectrum is discussed.

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  • Received 18 May 2016

DOI:https://doi.org/10.1103/PhysRevD.94.095025

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

S. N. Gninenko1, N. V. Krasnikov1,2, M. M. Kirsanov1, and D. V. Kirpichnikov1

  • 1Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia
  • 2Joint Institute for Nuclear Research, 141980 Dubna, Russia

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Vol. 94, Iss. 9 — 1 November 2016

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