Contribution of disconnected diagrams to the hyperfine splitting of charmonium

We discuss the contribution of OZI-suppressed diagrams to the hyperfine splitting of charmonium in lattice QCD. We study valence quark mass regions from strange to charm quark masses. No contribution of the disconnected diagram is seen in the vector meson channel. In the pseudo-scalar channel and fo...

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Detalles Bibliográficos
Autores principales: De Forcrand, Philippe, Pérez-Garcia, M, Matsufuru, H, Nakamura, A, Pushkina, I, Stamatescu, I O, Takaishi, T, Umeda, T
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Lattice
Acceso en línea:https://dx.doi.org/10.1088/1126-6708/2004/08/004
http://cds.cern.ch/record/732121
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author De Forcrand, Philippe
Pérez-Garcia, M
Matsufuru, H
Nakamura, A
Pushkina, I
Stamatescu, I O
Takaishi, T
Umeda, T
author_facet De Forcrand, Philippe
Pérez-Garcia, M
Matsufuru, H
Nakamura, A
Pushkina, I
Stamatescu, I O
Takaishi, T
Umeda, T
author_sort De Forcrand, Philippe
collection CERN
description We discuss the contribution of OZI-suppressed diagrams to the hyperfine splitting of charmonium in lattice QCD. We study valence quark mass regions from strange to charm quark masses. No contribution of the disconnected diagram is seen in the vector meson channel. In the pseudo-scalar channel and for valence quark masses around the strange quark, the disconnected contribution induces a considerable increase of the meson mass. This contribution quickly decreases as the quark mass increases. For charmonium the effect is very small although a decrease of the pseudoscalar mass induced by the disconnected contribution cannot be ruled out.
id cern-732121
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2004
record_format invenio
spelling cern-7321212019-09-30T06:29:59Zdoi:10.1088/1126-6708/2004/08/004http://cds.cern.ch/record/732121engDe Forcrand, PhilippePérez-Garcia, MMatsufuru, HNakamura, APushkina, IStamatescu, I OTakaishi, TUmeda, TContribution of disconnected diagrams to the hyperfine splitting of charmoniumParticle Physics - LatticeWe discuss the contribution of OZI-suppressed diagrams to the hyperfine splitting of charmonium in lattice QCD. We study valence quark mass regions from strange to charm quark masses. No contribution of the disconnected diagram is seen in the vector meson channel. In the pseudo-scalar channel and for valence quark masses around the strange quark, the disconnected contribution induces a considerable increase of the meson mass. This contribution quickly decreases as the quark mass increases. For charmonium the effect is very small although a decrease of the pseudoscalar mass induced by the disconnected contribution cannot be ruled out.hep-lat/0404016IFT-UAM-CSIC-2004-14YITP-2004-23oai:cds.cern.ch:7321212004-04-24
spellingShingle Particle Physics - Lattice
De Forcrand, Philippe
Pérez-Garcia, M
Matsufuru, H
Nakamura, A
Pushkina, I
Stamatescu, I O
Takaishi, T
Umeda, T
Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title_full Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title_fullStr Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title_full_unstemmed Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title_short Contribution of disconnected diagrams to the hyperfine splitting of charmonium
title_sort contribution of disconnected diagrams to the hyperfine splitting of charmonium
topic Particle Physics - Lattice
url https://dx.doi.org/10.1088/1126-6708/2004/08/004
http://cds.cern.ch/record/732121
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