我们讨论如何计算由直接D s±→ν产生的ντ和ντ$$ {\ overline {\ nu}} _ {\ tau} $$的横截面以及速度，横向动量和能量分布 τ/ντ$$ {D} _s ^ {\ pm} \至{\ nu} _ {\ tau} / {\ overline {\ nu}} _ {\ tau} $$和链D s±→τ + /τ−→ντ/ντ$$ {D} _s ^ {\ pm} \ to {\ tau} ^ {+} / {\ tau} ^ {-} \ to {\ nu} _ {\ tau} / {\ overline {\ nu}} _ {\ tau} $$在质子束E lab = 4