Scalar meson f{sub 0}(980) in heavy-meson decays

Journal Article · Wed Apr 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.076004· OSTI ID:21308220

El-Bennich, B ^[1]; Leitner, O ^[1]; Dedonder, J -P; Loiseau, B ^[1]

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1. Laboratoire de Physique Nucleaire et de Hautes Energies (IN2P3-CNRS-Universites Paris 6 et 7), Groupe Theorie, Universite Pierre et Marie Curie, 4 place Jussieu, 75252 Paris (France)

A phenomenological analysis of the scalar meson f{sub 0}(980) is performed that relies on the quasi-two-body decays D and D{sub s}{yields}f{sub 0}(980)P, with P={pi}, K. The two-body branching ratios are deduced from experimental data on D or D{sub s}{yields}{pi}{pi}{pi}, KK{pi} and from the f{sub 0}(980){yields}{pi}{sup +}{pi}{sup -} and f{sub 0}(980){yields}K{sup +}K{sup -} branching fractions. Within a covariant quark model, the scalar form factors for the transitions D and D{sub s}{yields}f{sub 0}(980) are computed. The weak D decay amplitudes, in which these form factors enter, are obtained in the naive factorization approach assuming a qq state for the scalar and pseudoscalar mesons. They allow to extract information on the f{sub 0}(980) wave function in terms of uu, dd, and ss pairs as well as on the mixing angle between the strange and nonstrange components. The weak transition form factors are modeled by the one-loop triangular diagram using two different relativistic approaches: covariant light-front dynamics and dispersion relations. We use the information found on the f{sub 0}(980) structure to evaluate the scalar and vector form factors in the transitions D and D{sub s}{yields}f{sub 0}(980), as well as to make predictions for B and B{sub s}{yields}f{sub 0}(980), for the entire kinematically allowed momentum range of q{sup 2}.

• OSTI ID: 21308220
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
D MESONS
D S MESONS
DECAY AMPLITUDES
DISPERSION RELATIONS
F0-980 MESONS
FACTORIZATION
FORECASTING
FORM FACTORS
KAONS MINUS
KAONS PLUS
PARTICLE DECAY
PIONS MINUS
PSEUDOSCALAR MESONS
QUARK MODEL
RELATIVISTIC RANGE
SCALAR MESONS
TWO-BODY PROBLEM
WAVE FUNCTIONS
WEINBERG ANGLE