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New partially reconstructed backgrounds for R(Lambda) analysis

Mick Mulder requested to merge mmulder/Lb2Lll-PR-background-samples into master

For R(Lambda), the following samples have been recently produced:

  • Xib2Xiee modes, including Psi2S and Jpsi resonances (DST)
  • Lb2LPsi2S with Psi2S to JpsiPiPi (MDST)
  • Lb2L(1520)ellell modes with L(1520) -> Sigma Pi0, Sigma -> Lambda0 gamma (MDST for the non-resonant modes, DST for the resonant modes)

This merge request adds the required decay descriptors, sample labels, etc. for these new samples and fixes a bug in the upstream electron tuple by separating it from the rest of the dielectrontuple.

This also includes the changes from !199 (closed)

Edited by Mick Mulder

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