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Title: Search for the dark photon in π0 decays

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 < mA' < 70 MeV/c2. Furthermore, the NA48/2 sensitivity to the dark photon production in the K± → π± A' decay is also evaluated.
Authors:
 [1]
  1. Univ. of Cambridge, Cambridge (United Kingdom). et al.
Publication Date:
OSTI Identifier:
1261187
Grant/Contract Number:
AC02-76SF0051
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 746; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Na48/2 Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS