Cargando…

Recent results from NA48/2 experiment

The first observation of about 2000 candidates, with a background contamination below 3%, of the rare decay K± → π±π0e−e+ is reported. The preliminary branching ratio in the full kinematic region is obtained to be: BR(K± → π±π0e−e+)= (4.06±0.17).106 by analyzing the data collected in 2003. A sample...

Descripción completa

Detalles Bibliográficos
Autor principal: Misheva, Milena
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1142/9789813224568_0065
http://cds.cern.ch/record/2286112
_version_ 1780956050233491456
author Misheva, Milena
author_facet Misheva, Milena
author_sort Misheva, Milena
collection CERN
description The first observation of about 2000 candidates, with a background contamination below 3%, of the rare decay K± → π±π0e−e+ is reported. The preliminary branching ratio in the full kinematic region is obtained to be: BR(K± → π±π0e−e+)= (4.06±0.17).106 by analyzing the data collected in 2003. A sample of 1.69×107 π0 → e−e+γ decay candidates with a negligible background contamination collected in 2003–2004 data 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 exclusion region in the plane of the dark photon mass (mA′ ) and mixing parameter ε2 is established.
id oai-inspirehep.net-1605227
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-16052272019-09-30T06:29:59Zdoi:10.1142/9789813224568_0065http://cds.cern.ch/record/2286112engMisheva, MilenaRecent results from NA48/2 experimentParticle Physics - ExperimentThe first observation of about 2000 candidates, with a background contamination below 3%, of the rare decay K± → π±π0e−e+ is reported. The preliminary branching ratio in the full kinematic region is obtained to be: BR(K± → π±π0e−e+)= (4.06±0.17).106 by analyzing the data collected in 2003. A sample of 1.69×107 π0 → e−e+γ decay candidates with a negligible background contamination collected in 2003–2004 data 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 exclusion region in the plane of the dark photon mass (mA′ ) and mixing parameter ε2 is established.oai:inspirehep.net:16052272017
spellingShingle Particle Physics - Experiment
Misheva, Milena
Recent results from NA48/2 experiment
title Recent results from NA48/2 experiment
title_full Recent results from NA48/2 experiment
title_fullStr Recent results from NA48/2 experiment
title_full_unstemmed Recent results from NA48/2 experiment
title_short Recent results from NA48/2 experiment
title_sort recent results from na48/2 experiment
topic Particle Physics - Experiment
url https://dx.doi.org/10.1142/9789813224568_0065
http://cds.cern.ch/record/2286112
work_keys_str_mv AT mishevamilena recentresultsfromna482experiment