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On the question of a tensor interaction in pi -->e nu e gamma decay.

Data from a recent experiment on [pi][r arrow][ital e][nu][sub [ital e]][gamma] appear to be in disagreement with the standard model description of this decay. The discrepancy has been interpreted as a possible indication of the presence of a tensor quark-lepton interaction. We discuss the available empirical constraints on tensor interactions, and investigate the tensor interactions arising from the exchange of spin-zero leptoquarks. We find that while the above interpretation of the discrepancy in [pi][r arrow][ital e][nu][sub [ital e]][gamma] runs into difficulties, it cannot be regarded yet as ruled out.