Four-body baryonic decays of B→pp¯π+π−(π+K−) and Λp¯π+π−(K+K−)

We study the four-body baryonic B→B1B¯2M1M2 decays with B1,2 (M1,2) being charmless baryons (mesons). In accordance with the recent LHCb observations, each decay is considered to proceed through the B→M1M2 transition together with the production of a baryon pair. We obtain that B(B−→Λp¯π+π−)=(3.7−1.0+1.5)×10−6 and B(B¯0→pp¯π+π−,pp¯π+K−)=(3.0±0.9,6.6±2.4)×10−6, in agreement with the data. We also predict B(B−→Λp¯K+K−)=(3.0−0.9+1.3)×10−6, which is accessible to the LHCb and BELLE experiments.