Electroweak baryon number violation at high energies

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The electroweak baryon number violation is expected to be rapid at high temperatures. This implies that at least some multiparticle processes with B-violation are rapid at high energies. We discuss recent attempts to study the two-particle cross sections of instanton-like processes, which show that at energies below 10 TeV, the cross sections increase exponentially, and might even become large at about 10 TeV.