Colour rearrangements in B-meson decays

TL;DR

This paper introduces a colour rearrangement model for B-meson decays that successfully describes both hidden and open charm production, matching various decay modes and momentum distributions, including low-momentum J/psi spectra.

Contribution

The paper presents a novel colour rearrangement model that unifies the description of different B-meson decay channels and momentum distributions, improving upon previous models.

Findings

Accurately describes inclusive B decays to J/psi and D_s

Successfully models exclusive B decay channels like B to J/psi K(*)

Provides good fit to low-momentum J/psi momentum distribution

Abstract

We present a new model, based on colour rearrangements, which at the same time can describe both hidden and open charm production in B-meson decays. The model is successfully compared to both inclusive decays, such as B to J/psi X and B to D_s X, as well as exclusive ones, such as B to J/psi K^(*) and B to D^(*) D^(*)K. It also gives a good description of the momentum distribution of direct J/psi's, especially in the low-momentum region, which earlier has been claimed as a possible signal for new exotic states.