Suppression of the S-wave production of (3/2++(1/2)- heavy meson pairs in e+e- annihilation

The heavy meson- antimeson pairs, where one is an excited (3/2)(+) meson and the other is a ground state (1/2)(-) meson, namely, the pairs (D-1(2420)(D) over bar + c.c.), (D-1(2420)(D) over bar* + c.c.), (D-2(2460)(D) over bar* c.c.) in the charm sector and (B-1(5721)(B) over bar + c.c.), (B-1(5721)(B) over bar* +c.c.), (B-2(5747)(B) over bar* +c.c.) in the bottom sector, are allowed, by the quantum numbers, to be produced in the S wave in e(+)e(-) annihilation. We show, however, that such S- wave production is forbidden by the heavy quark spin symmetry. Thus, the yield of the considered meson pairs in e(+)e(-) annihilation should be significantly suppressed near the respective thresholds. In our view, this substantially weakens the arguments for considering the Y(4260) charmoniumlike resonance as a D-1(D) over bar molecular state.