RT Journal Article
T1 Chiral perturbation theory, the 1/N_c expansion and Regge behavior determine the structure of the lightest scalar meson
A1 Peláez Sagredo, José Ramón
A1 Pennington, M. R.
A1 Ruiz de Elvira, Jacobo
A1 Wilson, D. J.
AB The leading 1=N_c behavior of unitarized chiral perturbation theory distinguishes the nature of the ρ and the : The is a qq̅  meson, while the σ is not. However, semilocal duality between resonances and Regge behavior cannot be satisfied for larger N_c, if such a distinction holds. While the σ at N_c = 3 is inevitably dominated by its di-pion component, unitarized chiral perturbation theory also suggests that as N_c increases above 6–8, the σ may have a subdominant qq̅ fraction up at 1.2 GeV. Remarkably this ensures semilocal duality is fulfilled for the range of Nc ≤ 15–30, where the unitarization procedure adopted applies.
PB Amer Physical Soc
SN 1550-7998
YR 2011
FD 2011-11-09
LK https://hdl.handle.net/20.500.14352/44814
UL https://hdl.handle.net/20.500.14352/44814
LA eng
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NO ©2011 American Physical Society.M. R. P is grateful to Bob Jaffe for discussions about the issues raised at the start of this study. The authors (J. R. de E, M. R. P and D. J. W) acknowledge partial support of the EU-RTN Programme, Contract No. MRTN–CT-2006-035482, ‘‘Flavianet’’ for this work, while at the IPPP in Durham. D. J. W is grateful to the UK STFC for the award of a postgraduate studentship and to Jefferson Laboratory for hospitality while this work was completed. This work was supported in part by DOE Contract No. DE-AC05-06OR23177, under which Jefferson Science Associates, LLC, operates Jefferson Laboratory.
NO EU-RTN
NO UK STFC
NO DOE
DS Docta Complutense
RD 27 abr 2024