Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?

Quark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaborati...

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Detalles Bibliográficos
Autores principales: Maiani, Luciano, Piccinini, F, Polosa, Antonio, Riquer, V
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.70.054009
http://cds.cern.ch/record/768134
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author Maiani, Luciano
Piccinini, F
Polosa, Antonio
Riquer, V
author_facet Maiani, Luciano
Piccinini, F
Polosa, Antonio
Riquer, V
author_sort Maiani, Luciano
collection CERN
description Quark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaboration, D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta. Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are given.
id cern-768134
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2004
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spelling cern-7681342019-09-30T06:29:59Zdoi:10.1103/PhysRevD.70.054009http://cds.cern.ch/record/768134engMaiani, LucianoPiccinini, FPolosa, AntonioRiquer, VIs the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?Particle Physics - PhenomenologyQuark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaboration, D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta. Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are given.hep-ph/0407025CERN-PH-TH-2004-125oai:cds.cern.ch:7681342004-07-02
spellingShingle Particle Physics - Phenomenology
Maiani, Luciano
Piccinini, F
Polosa, Antonio
Riquer, V
Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title_full Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title_fullStr Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title_full_unstemmed Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title_short Is the anomalous decay ratio of D$_{sJ}$(2632) due to isospin breaking?
title_sort is the anomalous decay ratio of d$_{sj}$(2632) due to isospin breaking?
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.70.054009
http://cds.cern.ch/record/768134
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AT piccininif istheanomalousdecayratioofdsj2632duetoisospinbreaking
AT polosaantonio istheanomalousdecayratioofdsj2632duetoisospinbreaking
AT riquerv istheanomalousdecayratioofdsj2632duetoisospinbreaking

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