12⁢π⁢ⅈ⁢∫-∞(0+)ⅇz⁢t+12⁢t-1⁢tκ⁢Wκ,μ⁡(t-1)⁢ⅆ⁡t=2⁢z-κ-12Γ⁡(12+μ-κ)⁢Γ⁡(12-μ-κ)⁢K2⁢μ⁡(2⁢z),