Roles of a0(980), ?(1670), andS(1385) in the ?c+ ? ??p+ decay

Recently, the Belle Collaboration has measured the lambda(+)(c) -> eta lambda pi(+ )decay and reported the eta A and lambda pi(+ )invariant mass distributions, which show the clear signals of the resonances A(1670) and E(1385), respectively. Based on our previous works [Eur. Phys. J. C 76, 496 (2016) and Phys. Rev. D 95, 074024 (2017)], we reanalyze this process by considering the S -wave eta A and eta pi+ final state interactions within the chiral unitary approach, which dynamically generate the A(1670) and a(0)(980), respectively. Our results are in agreement with the Belle measurements of the eta lambda and pi+lambda invariant mass distributions. In addition, the pi(+)eta invariant mass distribution is also calculated and a cusp structure of a(0)(980) is clearly shown around the K(K) over bar mass threshold.

Automated summary

Recently, the Belle Collaboration has measured the lambda(+)(c) -> eta lambda pi(+ )decay and observed clear signals of the resonances A(1670) and E(1385). By reanalyzing the process and considering the S-wave eta A and eta pi+ final state interactions, researchers have obtained results that are consistent with the experimental measurements.