Study of rare top quark decays into a jet plus a charged pseudo-scalar meson

TL;DR

This paper investigates rare top quark decays into a jet and a charged pseudo-scalar meson using QCD factorization, providing theoretical predictions for branching ratios and energy dependence, with potential implications for new physics detection.

Contribution

It offers the first detailed QCD-based calculation of top quark decays into a jet and a pseudo-scalar meson, including next-to-leading order corrections and energy cut-off analysis.

Findings

Calculated branching ratios for two- and three-body decays.

Analyzed the energy cut-off dependence of the gluon jet.

Results suggest these decays could be observed in future experiments.

Abstract

The semi-inclusive decay processes of a top quark into a charged pseudo-scalar meson and a jet are studied within the framework of QCD factorization. The leading power of the decay matrix elements can be factorized into heavy-to-light quark transition current and a hadron matrix element up to next-to-leading order QCD corrections. We calculate one-loop virtual corrections together with real gluon emission corrections at the {\alpha}s order. The numerical results of the branching ratios are presented for the sum of two-body and three-body decays. We also study the energy cut-off dependence of the gluon jet. These processes are hopeful to be detected in the near future experiments, which can serve as probes for new physics.