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

Journal Article · Wed Apr 01 04:00:00 EDT 2009 · Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRevD.79.076004· OSTI ID:992392

El-Bennich, B; Leitner, O; Dedonder, J -P; Loiseau, B

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}, K{sup -} K{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 q{bar q} state for the scalar and pseudoscalar mesons. They allow to extract information on the f{sub 0}(980) wave function in terms of u{bar u}, d{bar d}, and s{bar s} 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}.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; Marie Curie International Reintegration Grant
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 992392
• Report Number(s): ANL/PHY/JA-62904
• Journal Information: Phys. Rev. D, Journal Name: Phys. Rev. D Journal Issue: Apr. 2009 Vol. 79; ISSN 1550-7998
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY AMPLITUDES
DISPERSION RELATIONS
FACTORIZATION
FORM FACTORS
PSEUDOSCALAR MESONS
QUARK MODEL
SCALAR MESONS
SCALARS
VECTORS
WAVE FUNCTIONS