Resolving the low mass puzzle of Λc(2940)+

For the long standing low mass puzzle of Lambda(c)(2940)(+), we propose an unquenched picture. Our calculation explicitly shows that themass of the Lambda(c)(2P, 3/2(-)) state can be lowered down to be consistent with the experimental data of Lambda(c)(2940)(+) by introducing the D* N channel contribution. It means that the low mass puzzle of Lambda(c)(2940)(+) can be solved. What is more important is that we predict a mass inversion relation for the 2P Lambda(+)(c) c states, i.e., the Lambda(c)(2P, 1/2(-)) state is higher than the Lambda(c)(2P, 3/2(-)), which is totally different from the result of conventional quenched quark model. It provides a criterion to test such an unquenched scenario for Lambda(c)(2940)(+). We expect the future experimental progress from the LHCb and Belle II.