2 00 6 Two topics for a discussion on the bs̄ and bq̄ systems
نویسندگان
چکیده
The analysis of the b¯ s system is an important issue in the Physics programs of the hadron colliders. We discuss two different topics: the structure of the orbitally excited states and prediction of the rates of a class of non leptonic Bs decays. Experiments at the hadron colliders can analyze different aspects of the heavy meson systems, both in the strong, both in the weak sector. For such systems, predictions are possible using symmetries and the available data. We present two examples of experimental interest: the properties of the orbitally excited b¯ s (b¯ q) resonances and the rates of a class of nonleptonic B s decays. A theoretical framework to describe the excited b¯ s, b¯ q states is the heavy quark chiral effective theory, constructed using the spin-flavour symmetry for hadrons comprising a single heavy quark, in the m Q → ∞ limit, and the chiral symmetry valid in the massless limit for light quarks [1]. Heavy Q¯ q mesons are classified in doublets according to the angular momentum s ℓ of the light degrees of freedom: s ℓ = s ¯ q + ℓ (s ¯ q is the light antiquark spin, ℓ the orbital angular momentum of the light degrees of freedom relative to the heavy quark) [2]. For ℓ = 0 the s P ℓ = 1 2 − doublet comprises two states with J P = (0 − , 1 −): P = D (s) (B (s)) and P * = D * (s) (B * (s)) mesons in case of charm (beauty), respectively. For ℓ = 1 it could be either s P ℓ =
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