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Scalar meson f<sub>0</sub>(980) in B and D Decays
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Amphi Pierre Lehmann (LAL)
Amphi Pierre Lehmann
LAL
Description
The understanding of scalar mesons is a challenge, both in theoretical and experimental physics. Scalar mesons, described within the Standard Model formalism, are still controversial and their identification also remains a difficult experimental task. Viewing the f0(980) as a quark-antiquark state, we have performed a complete calculation of the transition form factors between pseudo-scalar and scalar mesons in weak decays, namely the B(D) and f0(980), respectively.
Covariant Light Front Dynamics (CLFD), applied to a relativistic quark model, has been used. CLFD proposes a formulation in which the evolution for a given system is expressed in terms of covariant
expressions. The particle is described by a wave function expressed in terms of Fock components of the state vector which respects the properties required under any transformation. In particular, these form factors are obtained in the full q2 range for weak decays.
In our model, the mesonic wave function of the f0(980) is constrained by making use of several branching ratios of D decays: Ds+ -> f0(980) -> +, Ds+ -> f0(980) K+, D0 -> \bar{K}0 f0(980), D+ -> f0(980) K+ and D+ -> f0(980) -> +. We will present a complete phenomenological analysis of the f0(980) scalar meson as well as the transition form factors, F0(q2) and F1(q2), describing the transition between B(D) and f0(980) mesons.
