Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays

<!--HTML-->The NA48/2 experiment at the CERN SPS has collected more than 100 million fully reconstructed K<sup>±</sup>-->π±π<sup>0</sup>π<sup>0</sup> decays.<br><br> The preliminary analysis of a third of the data shows a sudden change...

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Autor principal: Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa)
Lenguaje:eng
Publicado: 2005
Materias:
CERN Colloquium
Acceso en línea:http://cds.cern.ch/record/2746580
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author Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa),
author_facet Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa),
author_sort Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa),
collection CERN
description <!--HTML-->The NA48/2 experiment at the CERN SPS has collected more than 100 million fully reconstructed K<sup>±</sup>-->π±π<sup>0</sup>π<sup>0</sup> decays.<br><br> The preliminary analysis of a third of the data shows a sudden change of slope of the π<sup>0</sup>π<sup>0</sup> invariant mass distribution in the region around 2m, where m is the mass of the charged pion. This anomaly, which was never observed before, is interpreted as a cusp-like effect resulting mainly from the contribution of the K<sup>±</sup>-->π±π<sup>0</sup>π<sup>0</sup> decay amplitude through π<sup>+</sup>π<sup>-</sup> -->π<sup>0</sup>π<sup>0</sup> charge exchange.<br><br> The study of this phenomenon is a new and potentially more accurate method to measure a<sup>0</sup>-a<sup>2</sup>, the difference of the I = 0 and I = 2 S-wave scattering lengths.<br><br> <br><br> The colloquium will consist of two parts: the experiment, given by Italo Mannelli, and the theory by Nicola Cabibbo.<br><br> <BR><BR><I>Organiser(s): Luis Alvarez-Gaume / PH-TH</i><BR><BR><I>Note: * Tea & coffee will be served at 16.00 hrs.</i>
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2005
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spelling cern-27465802022-11-02T22:21:11Zhttp://cds.cern.ch/record/2746580engNicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa), Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decaysDetermination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decaysCERN Colloquium<!--HTML-->The NA48/2 experiment at the CERN SPS has collected more than 100 million fully reconstructed K<sup>±</sup>-->π±π<sup>0</sup>π<sup>0</sup> decays.<br><br> The preliminary analysis of a third of the data shows a sudden change of slope of the π<sup>0</sup>π<sup>0</sup> invariant mass distribution in the region around 2m, where m is the mass of the charged pion. This anomaly, which was never observed before, is interpreted as a cusp-like effect resulting mainly from the contribution of the K<sup>±</sup>-->π±π<sup>0</sup>π<sup>0</sup> decay amplitude through π<sup>+</sup>π<sup>-</sup> -->π<sup>0</sup>π<sup>0</sup> charge exchange.<br><br> The study of this phenomenon is a new and potentially more accurate method to measure a<sup>0</sup>-a<sup>2</sup>, the difference of the I = 0 and I = 2 S-wave scattering lengths.<br><br> <br><br> The colloquium will consist of two parts: the experiment, given by Italo Mannelli, and the theory by Nicola Cabibbo.<br><br> <BR><BR><I>Organiser(s): Luis Alvarez-Gaume / PH-TH</i><BR><BR><I>Note: * Tea & coffee will be served at 16.00 hrs.</i>oai:cds.cern.ch:27465802005
spellingShingle CERN Colloquium
Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa),
Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title_full Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title_fullStr Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title_full_unstemmed Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title_short Determination of the ππ scattering lenghts from K<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
title_sort determination of the ππ scattering lenghts from k<sup>±</sup> -->π<sup>±</sup>π<sup>0</sup>π<sup>0</sup> decays
topic CERN Colloquium
url http://cds.cern.ch/record/2746580
work_keys_str_mv AT nicolacabibboitalomannelliunivlasapienzaromaandscuolanormalesuperiorepisa determinationoftheppscatteringlenghtsfromksupsuppsupsuppsup0suppsup0supdecays

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