Speaker
Eric Swanson
(University of Pittsburgh)
Description
We present a model for the J/ψ Λ spectrum in B− → J/ψ Λ p ̄ decays, including the PΛ_{psi s} (4338)
baryon recently observed by the LHCb collaboration. We assume production via triangle diagrams
which couple to the final state via non-perturbative interactions which are constrained by heavy-
quark and SU3-flavor symmetry. The bulk of the distribution is described by a triangle diagram
with a color-favored electroweak vertex, while the sharp PΛ (4338) enhancement is due to the ψs
triangle singularity in another diagram featuring a 1/2− baryon consistent with Σc(2800).
Primary author
Eric Swanson
(University of Pittsburgh)
