Search for a new gauge boson in pi0 decays - INSPIRE

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Search for a new gauge boson in pi0 decays

NOMAD

Collaboration

Mar, 1998

15 pages

Published in:

Phys.Lett.B 428 (1998) 197-205

e-Print:

hep-ex/9804003 [hep-ex]

DOI:

10.1016/S0370-2693(98)00402-X

PDG:

{{\mathit A}^{0}}

(Axion) and Other Light Boson (

{{\mathit X}^{0}}

) Searches in Hadron Decays

Report number:

CERN-EP-98-047

Experiments:

CERN-WA-096

View in:

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Abstract:

A search was made for a new light gauge boson

X

which might be produced in

\pi^{0}\to\gamma + X

decay from neutral pions generated by 450-GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of

X \to\pi^{0}

conversion in the external Coulomb field of a nucleus. With

1.45\times10^{18}

protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in agreement with the expectation of 18.1

\pm

2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio

Br(\pi^{0}\to\gamma + X)< (3.3 to 1.9) \times10^{-5}

for

X

masses ranging from 0 to 120 MeV/c^2 is obtained.

Note:

15 pages, LaTex, 6 eps figures included, submitted to Physics Letters B Report-no: CERN-EP/98-047

p nucleus: inclusive reaction
pi0: hadroproduction
pi0: radiative decay
gauge boson: search for
scattering: gauge boson nucleus
Primakoff effect
pi0: branching ratio
coupling: (gauge boson quark)
upper limit
experimental results

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Figures(0)

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