Search for the dark photon in π0 decays

Batley, J. R.

doi:10.1016/j.physletb.2015.04.068

Title: Search for the dark photon in π⁰ decays

Journal Article · 05 May 2015 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2015.04.068 · OSTI ID:1261187

Batley, J. R. ^[1]

Univ. of Cambridge, Cambridge (United Kingdom). et al.

A sample of 1.69 × 10⁷ fully reconstructed π⁰ → γe⁺e^– decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon (A') production in the π0→γA' decay followed by the prompt A' → e⁺e^– decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA' and mixing parameter ε² is established. The obtained upper limits on ε² are more stringent than the previous limits in the mass range 9 MeV/c² < m_A' < 70 MeV/c². Furthermore, the NA48/2 sensitivity to the dark photon production in the K^± → π^± A' decay is also evaluated.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Na48/2 Collaboration

Grant/Contract Number:: AC02-76SF0051

OSTI ID:: 1261187

Journal Information:: Physics Letters. B, Vol. 746, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 245 works

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