Interplay of quark and meson degrees of freedom in a near-threshold resonance

Baru, V.; Hanhart, C.; Nefediev, A.V.; Kudryavtsev, A.E.; Kalashnikova, Y.S.

doi:10.1140/epja/i2010-10929-7

Journal Article

PreJuSER-13071

Interplay of quark and meson degrees of freedom in a near-threshold resonance

Baru, V.FZJ* ; Hanhart, C.FZJ* ; Kalashnikova, Y. S. ; Kudryavtsev, A. E. ; Nefediev, A. V.

2010
Springer Berlin

The European physical journal / A 44, 93 - 103 (2010) [10.1140/epja/i2010-10929-7]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10329 doi:10.1140/epja/i2010-10929-7

Abstract: We investigate the interplay of quark and meson degrees of freedom in a physical state representing a near-threshold resonance for the case of a single continuum channel. We demonstrate that such a near-threshold resonance may possess quite peculiar properties if both quark and meson dynamics generate weakly coupled near-threshold poles in the S-matrix. In particular, the scattering t-matrix may possess zeros in this case. We also discuss possible implications for production reactions as well as studies within lattice QCD.

Keyword(s): hadron hadron: elastic scattering ; quark ; pole ; meson ; quantum chromodynamics ; exchange ; lattice field theory ; scattering amplitude ; S-matrix: pole ; resonance ; threshold ; continuum limit ; cross section ; numerical calculations

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Note: The work was supported in parts by funds provided from the Helmholtz Association (grants VH-NG-222, VH-VI-231), by the DFG (grants SFB/TR 16 and 436 RUS 113/991/0-1), by the EU HadronPhysics2 project, by the RFFI (grants RFFI-09-02-91342-NNIOa and RFFI-09-02-00629a), and by the Presidential programme for support of the leading scientific schools (grants NSh-4961.2008.2 and NSh-4568.2008.2). The work of V. B., Yu.S.K., A. E. K., and A.V.N. was supported by the State Corporation of Russian Federation "Rosatom". A.V.N. would like to acknowledge the support of the non-profit "Dynasty" foundation and ICFPM and of the grant PTDC/FIS/70843/2006-Fisica.

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