About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?

Since several decades, a particular attention has been devoted to hadrons with anomalous properties [1], [2], [3], [4], [5]. On the experimental side, the search has been very difficult and disappointing. For instance, in the early 60's, there has been some claims for baryon resonances with str...

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Detalles Bibliográficos
Autor principal: Richard, Jean-Marc
Lenguaje:eng
Publicado: 2020
Materias:
hep-ph
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/j.scib.2020.08.020
http://cds.cern.ch/record/2759267
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author Richard, Jean-Marc
author_facet Richard, Jean-Marc
author_sort Richard, Jean-Marc
collection CERN
description Since several decades, a particular attention has been devoted to hadrons with anomalous properties [1], [2], [3], [4], [5]. On the experimental side, the search has been very difficult and disappointing. For instance, in the early 60's, there has been some claims for baryon resonances with strangeness , the so-called Z baryons, while the established baryons have either or . But the Z spectrum was based on somewhat hazardous analyses of -nucleon scattering data without spin observables, and it faded away. It reappeared under the name of pentaquark, but it was never firmly established.
id cern-2759267
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
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spelling cern-27592672021-03-29T02:11:45Zdoi:10.1016/j.scib.2020.08.020http://cds.cern.ch/record/2759267engRichard, Jean-MarcAbout the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?hep-phParticle Physics - PhenomenologySince several decades, a particular attention has been devoted to hadrons with anomalous properties [1], [2], [3], [4], [5]. On the experimental side, the search has been very difficult and disappointing. For instance, in the early 60's, there has been some claims for baryon resonances with strangeness , the so-called Z baryons, while the established baryons have either or . But the Z spectrum was based on somewhat hazardous analyses of -nucleon scattering data without spin observables, and it faded away. It reappeared under the name of pentaquark, but it was never firmly established.Since several decades, a particular attention has been devoted to hadrons with anomalous properties [1], [2], [3], [4], [5]. On the experimental side, the search has been very difficult and disappointing. For instance, in the early 60's, there has been some claims for baryon resonances with strangeness , the so-called Z baryons, while the established baryons have either or . But the Z spectrum was based on somewhat hazardous analyses of -nucleon scattering data without spin observables, and it faded away. It reappeared under the name of pentaquark, but it was never firmly established.We discuss the interpretation of the $J\!/\!\psi\,J\!/\!\psi$ peak recently seen by the LHCb collaboration at CERN, and take the opportunity to review the experimental and theoretical state of the art for exotic hadrons. It is stressed that in constituent models, the states in the continuum require a dedicated treatment to single out resonances atop the continuum.arXiv:2008.01962oai:cds.cern.ch:27592672020-08-05
spellingShingle hep-ph
Particle Physics - Phenomenology
Richard, Jean-Marc
About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title_full About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title_fullStr About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title_full_unstemmed About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title_short About the $J/\psi$ $J/\psi$ peak of LHCb: fully-charmed tetraquark?
title_sort about the $j/\psi$ $j/\psi$ peak of lhcb: fully-charmed tetraquark?
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.scib.2020.08.020
http://cds.cern.ch/record/2759267
work_keys_str_mv AT richardjeanmarc aboutthejpsijpsipeakoflhcbfullycharmedtetraquark

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