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Motivated by the prospects of the ongoing B meson experiments, we study the exclusive B a₁ (1260) ^- _ process within the Standard model effective field theory formalism. The new physics parameters are constrained by using the experimental branching fractions of the (semi) leptonic B and B (, , ) processes (where = e, , ) which undergoes b u quark level transitions. We then study a comprehensive angular coefficient analysis of the exclusive B a₁ (1260) ^- _ process in the Standard model and in the presence of various new physics operators.
Mohapatra et al. (Tue,) studied this question.