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The Veneziano amplitude is derived from fixing one degree of freedom of$PSL(2,\mathbb{R})$ symmetry by the insertion of a mostly BRST exact operator.Evaluating the five-point function which consists of four open string tachyonsand this gauge fixing operator, we find it equals the Veneziano amplitude up toa sign factor. The sign factor is interpreted as a signed intersectionnumber.The result implies that the mostly BRST exact operator, which isoriginally used to provide two-point string amplitudes, correctly fixes the$PSL(2,\mathbb{R})$ gauge symmetry for general amplitudes. We conjecture anexpression for general $n$-point tree amplitudes with an insertion of thisgauge fixing operator.

The Veneziano Amplitude via Mostly BRST Exact Operator