  We calculate the form factors for the baryon number violation processes of a
heavy-flavor baryon decaying into a pseudoscalar meson and a lepton. In the
framework of the Standard Model effective field theory, the leptoquark
operators at the bottom quark scale, whose matrix elements define the form
factors, are derived by integrating out the high energy physics. Under the QCD
factorization approach, the form factors of the baryon number violation
processes at leading power can be factorized into the convolution of the
long-distance hadron wave functions as well as the short-distance hard and jet
functions representing the hard scale and hard-collinear scale effects,
separately. Based on measurements of the baryon number violation processes by
LHCb, we further impose constraints on the new physics constants of leptoquark
operators.
