  We analyze the possibility of studying the heavy flavour hadroproduction
properties at the HERA-B experiment. In addition to the high statistics single
inclusive B spectra measurements, the measurement of the BBbar meson
correlations is considered. The techniques of momentum estimators, widely used
in the charm sector, are demonstrated to be useful for the BBbar correlation
studies at HERA-B. The kinematic limits for the precision of the momentum
estimator within which the pair spectra can be measured are determined. The
errors are weakly dependent on the topology of the multibody B meson decay.
