∫0∞ⅇ-14⁢t2⁢t-a-12⁢(x2+t2)-1⁢U⁡(a,t)⁢ⅆ⁡t=π/2⁢Γ⁡(12-a)⁢x-a-32⁢ⅇ14⁢x2⁢U⁡(-a,x),