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We compute the Green functions and correlator functions for N twist fieldsfor branes at angles on T^2 and we show that there are N-2 differentconfigurations labeled by an integer M which is roughly associated with thenumber of obtuse angles of the configuration. In order to perform thiscomputation we use a SL(2,R) invariant formulation and geometric constraintsinstead of Pochammer contours. In particular the M=1 or M=N-1 amplitude can beexpressed without using transcendental functions. We determine the amplitudesnormalization from N -> N-1 reduction without using the factorization into theuntwisted sector. Both the amplitudes normalization and the OPE of two twistfields are unique (up to one constant) when the \epsilon <-> 1-\epsilonsymmetry is imposed. For consistency we find also an infinite number ofrelations among Lauricella hypergeometric functions.

Green functions and twist correlators for $N$ branes at angles