Draft: Lb2ppimumu backgrounds
Addition of \Lambda_b \to p \pi \pi \pi and \Lambda_b \to p K \pi \pi for analysis \Lambda_b \to p \pi \mu \mu.
Addition of \Lambda_b \to p \pi \pi \pi and \Lambda_b \to p K \pi \pi for analysis \Lambda_b \to p \pi \mu \mu.