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In this paper we present an improved fitting formula for the dark matterbispectrum motivated by the previous phenomenological approach of Scoccimarro &Couchman (2001). We use a set of LCDM simulations to calibrate the fittingparameters in the k-range of 0.03 h/Mpc<k<0.4 h/Mpc and in the redshift rangeof 0<z<1.5. This new proposed fit describes well the BAO-features although itwas not designed to. The deviation between the simulations output and ouranalytic prediction is typically less than 5% and in the worst case is neverabove 10%. We envision that this new analytic fitting formula will be veryuseful in providing reliable predictions for the non-linear dark matterbispectrum for LCDM models.

An improved fitting formula for the dark matter bispectrum