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FIZIKA B 13 (2004) 1, 43 - 56
 
MESON FORM FACTORS IN THE QUARK-BASED LINEAR s
MODEL
MICHAEL D. SCADRONa, FRIEDER KLEEFELDb, GEORGE
RUPPb and EEF van BEVERENc
aPhysics Department, University of Arizona, Tucson, AZ 85721,
USA
bCentro de Física das Interacçoes Fundamentais, Instituto Superior Técnico,
P-1049-001 Lisboa, Portugal
cDepartamento de Física, Universidade de Coimbra, P-3004-516 Coimbra, Portugal
E-mail addresses: scadron@physics.arizona.edu,
kleefeld@cfif.ist.utl.pt ,
george@ajax.ist.utl.pt , eef@teor.fis.uc.pt
Received 24 August 2003; Accepted 26
April 2004
Online 16 July 2004
The quark-level linear s model (LsM)
is employed to compute a variety of electromagnetic and weak observables of light mesons,
including pion and kaon form factors and charge radii, charged-pion polarizabilities,
semileptonic weak Kl3 decay, semileptonic weak radiative pion and kaon
form factors, radiative decays of vector mesons, and nonleptonic weak K2p decay. The agreement of all these predicted observables with
experiment is striking. In passing, the tight link between the LsM and
vector-meson dominance is shown. Some conclusions are drawn on the LsM in
connection with lattice and renormalization-group approaches to QCD.
PACS numbers: 12.40.-y, 11.30.Rd, 13.40.Gp, 13.40.Hq, 13.20.Cz,13.20.Eb,
13.25.Es, 12.40.Vv
UDC 539.12.1
Keywords: linear sigma model, quarks, mesons, pion, kaon, form factors, charge radii,
charged-pion polarizabilities, weak decay
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