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Add two cocktail decfiles for Xibstar -> Lb K Pi decay

Mengzhen Wang requested to merge mengzhen/add_decfile_Xib2LbKpi into master

This merge request is to submit two DecFiles for Xib* -> Lb K pi decay mode. Each file is for one Xib* state.

There can be contribution of Sigmab and Sigmab* particles in Lbpi system, and this is implemented in these DecFiles.

For the Lb decay, we use three modes: JpsipK, Lcpi and Lc3pi. The ratio of these modes are based on the ratio of corresponding branching fractions of Lb decays and Jpsi (or Lc) decays.

These files has been tested locally. The decparser.sh script shows only an error message about the Descriptor, but the current Descriptor seems to be fine. .xgen and .root files can be generated sucessfully. The mass distribution of the Xib*, Sigmab, Sigmab* particles are as expected.

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