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Semi-inclusive rapidity distributions from entropy maximization.

We propose a very simple analytic formula for single-particle semi-inclusive rapidity distributions of hadrons produced in a multiple production process with n final-state hadrons and no leading particles: sigma/sup -1//sub n/dsigma/sub n//dy = p/sub n/(y) = A/sub n/exp(-B/sub n/ coshy). This form is obtained by maximizing information-theoretical entropy defined in terms of rho/sub n/(y) subject to the normalization and energy-momentum conservation. It reproduces with high accuracy the result which was obtained from a longitudinal-phase-space model, in particular, when the multiplicity n is large.