Equation Icon  e− ¯sāˆ•4 2 TrKH α2 = αTrKH2 + (1 − α)(4π-¯s)1āˆ•2kH (¯s) + O(1 − α ) , ∫ ( ) ∞ cosh-y- ---2y-- − y2āˆ•¯s kH(¯s) = 0 dy sinh2 y 1 − sinh 2y e , (252 )