Search for production of an invisible dark photon in (0) decays

Gil, E Cortina, Kleimenova, A, Minucci, E, Padolski, S, Petrov, P, Shaikhiev, A, Volpe, R, Georgiev, G, Kozhuharov, V, Litov, L
et al (show 190 more authors) (2019) Search for production of an invisible dark photon in (0) decays. JOURNAL OF HIGH ENERGY PHYSICS, 2019 (5).

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<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The results of a search for <jats:italic>π</jats:italic> <jats:sup>0</jats:sup> decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 × 10<jats:sup>8</jats:sup> tagged <jats:italic>π</jats:italic> <jats:sup>0</jats:sup> mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60–110 MeV/<jats:italic>c</jats:italic> <jats:sup>2</jats:sup>. The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\pi}^0\to \gamma \nu \overline{\nu} $$</jats:tex-math> <mml:math xmlns:mml=""> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>γ</mml:mi> <mml:mi>ν</mml:mi> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula>, improving the current limit by more than three orders of magnitude.</jats:p>

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, Exotics, Fixed target experiments, Rare decay
Depositing User: Symplectic Admin
Date Deposited: 15 Aug 2019 09:47
Last Modified: 19 Jan 2023 00:29
DOI: 10.1007/JHEP05(2019)182
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