after test on invariant mass reconstruction in pi0, it appears that energy...
after test on invariant mass reconstruction in pi0, it appears that energy rescaling should be done before decay to avoid reconstruction problems. As a consequence, if ibreit is used, energy is not rescaled later and their is a small energy violation due to small mass shift (less than 1GeV in total). git-svn-id: https://devel-ik.fzk.de/svn/mc/crmc/trunk@4910 c7a5e08c-de06-0410-9364-b41cf42a0b17
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