Search for the dark photon in π0 decays

Roberto Piandani

doi:10.1051/epjconf/201612604035

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

Proceedings

Open Access

EPJ Web of Conferences 126, 04035 (2016)
https://doi.org/10.1051/epjconf/201612604035

Search for the dark photon in π⁰ decays

Roberto Piandani^a for the NA48/2 Collaboration: Cambridge, CERN, Dubna, Chicago, Edinburgh, Ferrara, Firenze, Mainz, Northwestern, Perugia, Pisa, Saclay, Siegen, Torino, Wien.

INFN Pisa

^a e-mail: roberto.piandani@cern.ch

Published online: 4 November 2016

Abstract

A sample of 1.69 × 10⁷ fully reconstructed π⁰ → γe⁺e⁻ in the kinematic range m_ee > 10MeV/c² with a negligible background contamination collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon (A′) via the decay chain π;⁰ → γA′, A′ → e⁺e. No signal is observed, and preliminary exclusion limits on space of dark photon mass m_A′ and mixing parameter ϵ² are reported.

© The Authors, published by EDP Sciences, 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.