Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor

The NA48/2 experiment at CERN performed a search for the dark photon (A′) via the decay chain π (0) → γA′, A′ → e (+) e (−). Using a sample of ∼ 1.7 · 10(7) neutral pions tagged from and decays collected in 2003-04 no signal is observed. The limits in the plane dark photon mixing parameter ε (2) ver...

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Detalles Bibliográficos
Autor principal: Raggi, Mauro
Lenguaje:eng
Publicado: 2017
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1088/1742-6596/800/1/012032
http://cds.cern.ch/record/2288065
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author Raggi, Mauro
author_facet Raggi, Mauro
author_sort Raggi, Mauro
collection CERN
description The NA48/2 experiment at CERN performed a search for the dark photon (A′) via the decay chain π (0) → γA′, A′ → e (+) e (−). Using a sample of ∼ 1.7 · 10(7) neutral pions tagged from and decays collected in 2003-04 no signal is observed. The limits in the plane dark photon mixing parameter ε (2) versus its mass m(A)(′) are reported. The NA62-RK experiment collected, during the 2007 data taking, a large sample of neutral pion Dalitz decays with a trigger optimised for electrons final states with respect to NA48/2 one. We report the measurement of the π (0) electromagnetic transition form factor (TFF) slope parameter (a) based on a sample of decays. The preliminary measured value a = (3.70 ± 0.53( )stat( ) ± 0.36( )syst( )) · 10(−)(2) is compatible with theoretical expectations and previous measurements.
id oai-inspirehep.net-1519310
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling oai-inspirehep.net-15193102021-02-09T10:05:28Zdoi:10.1088/1742-6596/800/1/012032http://cds.cern.ch/record/2288065engRaggi, MauroSearch for dark photon at NA48/2, and measurement of $\pi^0$ form factorParticle Physics - ExperimentThe NA48/2 experiment at CERN performed a search for the dark photon (A′) via the decay chain π (0) → γA′, A′ → e (+) e (−). Using a sample of ∼ 1.7 · 10(7) neutral pions tagged from and decays collected in 2003-04 no signal is observed. The limits in the plane dark photon mixing parameter ε (2) versus its mass m(A)(′) are reported. The NA62-RK experiment collected, during the 2007 data taking, a large sample of neutral pion Dalitz decays with a trigger optimised for electrons final states with respect to NA48/2 one. We report the measurement of the π (0) electromagnetic transition form factor (TFF) slope parameter (a) based on a sample of decays. The preliminary measured value a = (3.70 ± 0.53( )stat( ) ± 0.36( )syst( )) · 10(−)(2) is compatible with theoretical expectations and previous measurements.oai:inspirehep.net:15193102017
spellingShingle Particle Physics - Experiment
Raggi, Mauro
Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title_full Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title_fullStr Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title_full_unstemmed Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title_short Search for dark photon at NA48/2, and measurement of $\pi^0$ form factor
title_sort search for dark photon at na48/2, and measurement of $\pi^0$ form factor
topic Particle Physics - Experiment
url https://dx.doi.org/10.1088/1742-6596/800/1/012032
http://cds.cern.ch/record/2288065
work_keys_str_mv AT raggimauro searchfordarkphotonatna482andmeasurementofpi0formfactor

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