B decays into radially excited charmed mesons

TL;DR

This paper investigates semileptonic B decays into radially excited charmed mesons using a constituent quark model, finding that the branching ratios are not as large as previously hypothesized and providing predictions for related non-leptonic decays.

Contribution

The study applies a constituent quark model to analyze B decays into radially excited charmed mesons, challenging prior assumptions of large branching ratios and offering new predictions for non-leptonic decay channels.

Findings

Large branching ratios for B→D'(*) semileptonic decays are not supported.

Calculated non-leptonic B→D'π decays can test the form factors.

Results refine understanding of B decay mechanisms.

Abstract

It has been recently argued that some longstanding problems in semileptonic B decays can be solved provided the branching ratio for the $B\to D^{\prime(\ast)}$ semileptonic decays are large enough. We have studied these decays in a constituent quark model which has been successful in describing semileptonic and non-leptonic B decays into orbitally excited charmed mesons. Our results do not confirm the hypothesis of large branching ratios for the $B\to D^{\prime(\ast)}$ semileptonic decays. In addition, we calculate the non-leptonic $B\to D'\pi$ decays which can provide an independent test of the form factors involved in the $B\to D^{\prime(\ast)}$ reactions.