H-dibaryon formation fromΛhypernuclei

It is pointed out that pions from weak decay of Λ hypernuclei could be due to production of the H dibaryon, whose mass could be as light as that of two nucleons. Possibility of such a light H particle has been shown recently by lattice QCD calculations. The mesonic-decay rate of Λ hypernuclei to produce the H is calculated to demonstrate experimental feasibility of a search for the H by detecting such pions. The ${\pi }^{+}$ decay, in particular, is shown to be a unique signature of the H production.