Dalitz plot analysis of D0 --> K0S pi+ pi- decays in a factorization approach

TL;DR

This paper employs a QCD factorization approach to analyze D0 --> K0S pi+ pi- decays, achieving good agreement with experimental data and highlighting the significance of annihilation amplitudes.

Contribution

It introduces a quasi two-body QCD factorization method for D0 decays and compares results with experimental Dalitz plot data from Belle and BABAR.

Findings

Good agreement with experimental Dalitz plot distributions

Branching fractions of dominant channels match previous models

Significant contribution from annihilation amplitudes

Abstract

A quasi two-body QCD factorization is used to study the D0 --> K0S pi+ pi decays. The presently available high-statistics Dalitz plot data of this process measured by the Belle and BABAR Collaborations are analyzed together with the tau- --> K0S pi- nu_tau decay data. The total experimental branching fraction is also included in the fits which show a very good overall agreement with the experimental Dalitz plot density distributions. The branching fractions of the dominant channels compare well with those of the isobar Belle or BABAR models. We show that the branching fractions corresponding to the annihilation amplitudes are significant.