Whether new data on Dₛ→ f₀(980) e+ νₑ can be understood if f₀(980) consists of only the conventional qq structure

الأصل · EN

Only two isospin-singlet scalar mesons f₀(600) (σ) and f₀(980) exist below 1 GeV, so that it is natural to suppose that they are two energy eigenstates which are mixtures of 1√ 2(u u+d d) and s s. Is this picture right? Generally, it is considered that f₀(600) mainly consists of 1√ 2(u u+d d), if so, the dominant component of f₀(980) should be s s. The recent measurement of the CLEO collaboration on the branching ratio of Dₛ→ f₀(980) e+ νₑ provides an excellent opportunity to testify the structure of f₀(980), namely whether the data can be understood as long as it consists of mainly the conventional q q structure. We calculate the form factors of Dₛ→ f₀(980) in the light-front quark model (LFQM) and the corresponding branching ratio of the semileptonic decay. By fitting the data, we obtain the mixing angle ϕ. The obtained mixing angle shows that the s s component in f₀(980) may not be dominant.