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Physical Review D
Within the framework of three-channel Ross-Shaw effective range theory, we derive the constraints among different parameters of the theory in the case of a narrow resonance close to the threshold of the third channel, which is relevant for the resonancelike structure Z c ð3900Þ. The usage of these constraint relations, together with the multichannel Lüscher formula in lattice QCD calculations are also discussed and the strategies are outlined.doi:10.1103/physrevd.101.054502 fatcat:3qh2ylb6bfb6fkp4jbz64macxe