B2 jpsikspipi

Kai Sebastian Habermannrequested to merge
B2_jpsikspipi into master

Supersedes old and already merged MR for this channel, where there may have been a bad cut on KS0s. This selection will sadly result in more storage needed, but the effiiency should be much higher

DecayDescriptor: B0 -> J/Psi KS0 pi+ pi-

Edited by Kai Sebastian Habermann

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