The meson Z+ (4430) as a tetraquark state

M. E. Bracco, S. H. Lee, M. Nielsen, R. Rodrigues da Silva

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We test the validity of the QCD sum rules applied to the meson Z+ (4430), by considering a diquark-antidiquark type of current with JP = 0- and with JP = 1-. We find that, with the studied currents, it is possible to find an acceptable Borel window. In such a Borel window we have simultaneously a good OPE convergence and a pole contribution which is bigger than the continuum contribution. We get mZ = (4.52 ± 0.09)   GeV and mZ = (4.84 ± 0.14)   GeV for the currents with JP = 0- and JP = 1-, respectively. We conclude that the QCD sum rules results favors JP = 0- quantum numbers for the Z+ (4430) meson.

Original languageEnglish
Pages (from-to)240-244
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume671
Issue number2
DOIs
Publication statusPublished - 2009 Jan 19

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mesons
sum rules
quantum chromodynamics
quantum numbers
poles
continuums

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Bracco, M. E. ; Lee, S. H. ; Nielsen, M. ; da Silva, R. Rodrigues. / The meson Z+ (4430) as a tetraquark state. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2009 ; Vol. 671, No. 2. pp. 240-244.
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The meson Z+ (4430) as a tetraquark state. / Bracco, M. E.; Lee, S. H.; Nielsen, M.; da Silva, R. Rodrigues.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 671, No. 2, 19.01.2009, p. 240-244.

Research output: Contribution to journalArticle

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AU - Bracco, M. E.

AU - Lee, S. H.

AU - Nielsen, M.

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AB - We test the validity of the QCD sum rules applied to the meson Z+ (4430), by considering a diquark-antidiquark type of current with JP = 0- and with JP = 1-. We find that, with the studied currents, it is possible to find an acceptable Borel window. In such a Borel window we have simultaneously a good OPE convergence and a pole contribution which is bigger than the continuum contribution. We get mZ = (4.52 ± 0.09)   GeV and mZ = (4.84 ± 0.14)   GeV for the currents with JP = 0- and JP = 1-, respectively. We conclude that the QCD sum rules results favors JP = 0- quantum numbers for the Z+ (4430) meson.

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