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Title: Search for the dark photon in π 0 decays

A sample of 1.69 × 10 7 fully reconstructed π 0 → 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 ε 2 is established. The obtained upper limits on ε 2 are more stringent than the previous limits in the mass range 9 MeV/c 2 < m A' < 70 MeV/c 2. 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 Lab., 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