Isospin-conserving hadronic decay of the Ds1(2460) into Dsπ+π−

Abstract

AbstractThe internal structure of the charm-strange mesonsDs0*(2317)andDs1(2460) are the subject of intensive studies. Their widths are small because they decay dominantly through isospin-breaking hadronic channelsDs0*(2317)+→Ds+π0andDs1(2460)+→Ds*+π0. TheDs1(2460) can also decay into the hadronic final statesDs+ππ, conserving isospin. In that case there is, however, a strong suppression from phase space. We study the transitionDs1(2460)+→Ds+π+π−in the scenario that theDs1(2460) is aD*Khadronic molecule. Theππfinal state interaction is taken into account through dispersion relations. We find that the ratio of the partial widths of theΓ(Ds1(2460)+→Ds+π+π−)/Γ(Ds1(2460)+→Ds*+π0)obtained in the molecular picture is consistent with the existing experimental measurement. More interestingly, we demonstrate that theπ+π−invariant mass distribution shows a double bump structure, which can be used to disentangle the hadronic molecular picture from the compact state picture for theDs1(2460)+. Predictions on theBs10→Bs0π+π−are also made.