Non-factorizable contribution in nonleptonic weak interactions of K mesons

Two pion decays of K mesons, K_L-K_S mass difference, two photon and the Dalitz decays of K_L are studied systematically by assuming that their amplitude is given by a sum of factorizable and non-factorizable ones. The former is estimated by using a naive factorization while the latter is assumed to be dominated by dynamical contributions of various hadron states.Comment: 23 pages,1 figur

The BABAR Resonance as a Four-quark Meson

By assigning the narrow scalar resonance (which has been recently observed at the B-factories) to one of iso-triplet four-quark mesons containing a charm quark, two body decays of the four-quark mesons are studied. It is predicted that some of them can be observed as narrow resonances.Comment: 4 pages, 0 figures, HADRON2003, Revte

Non-factorizable contribution in B decays

Two body decays of B mesons are studied by decomposing their amplitude into a sum of factorizable and non-factorizable ones. The former is estimated by using a naive factorization while the latter is assumed to be dominated by dynamical contributions of various hadron states and is calculated by using a hard pion (or kaon) technique in the infinite momentum frame. Possible roles of the non-factorizable contributions are discussed by comparing the result with experiments.Comment: 15 page

D_{s0}^+(2317) as an iso-triplet four-quark meson

Although assigning D_{s0}^+(2317) to the I_3=0 component of iso-triplet four-quark mesons is favored by experiments, its neutral and doubly charged partners have not yet been observed. It is discussed why they were not observed in inclusive e^+e^- annihilation experiments and that they can be observed in B decays.Comment: 3 pages, 5 figures, invited talk at QNP06, the 4th Int. Conf. on Quarks and Nuclear Physics, June 5 - 10, 2006, Madri

Isospin quantum number of D_{s0}^+(2317)

The D_s^+ pi^0 and D_s^{*+} gamma decays of the D_{s0}^+(2317) are studied by assigning it to various charmed strange scalar mesons. As a result, it is found that its assignment to an iso-triplet four-quark meson is favored by the severest experimental constraint on the ratio of the rates for these decays, while assigning it to an I=0 state (a four-quark or a conventional {c\bar{s}}) is inconsistent with this constraint.Comment: 6 pages, no figure, RevTeX4, references added and clarification of tex