\Upsilon(5S) decays into BB and BB\pi

TL;DR

This paper models the decay processes of the Upsilon(5S) particle into various B meson pairs and pions, using a theory with two parameters that successfully matches experimental decay widths.

Contribution

It applies a previously developed dipion transition theory to predict decay widths of Upsilon(5S) into B meson pairs and pions with minimal parameters.

Findings

Predicted total decay width of Upsilon(5S) matches experimental data.

Calculated partial widths for specific decay channels are consistent with observations.

Decay widths for pion-involved channels are around 10 keV.

Abstract

Two- and three-body decays of $\Upsilon (5S)$ into $BB, $$ BB^*, $ $ B^*B^*,$ $ B_sB_s, $ $B_sB_s^*, $ $B_s^* B_s^*$ and $BB^*\pi, B^*B^*\pi$ are evaluated using the theory, developed earlier for dipion bottomonium transitions. The theory contains only two parameters, vertex masses $M_{br}$ and $M_\omega$, known from dipion spectra and width. Predicted values of $\Gamma_{tot}(5S)$ and six partial widths $\Gamma_k(5S), k=BB, BB^*,...$ are in agreement with experiment. The decay widths $\Gamma_{5S}(\pi BB^*)$ and $\Gamma_{5S}(\pi B^*B^*)$ are also calculated and found to be of the order of 10 keV.