Measurement of the energy dependence of the $e^+e^-\to B\bar{B}$, $B\bar{B}^*$ and $B^*\bar{B}^*$ exclusive cross sections

TL;DR

This paper presents the first measurement of the energy-dependent exclusive cross sections for $e^+e^-$ annihilation into various $B$ meson pairs in the 10.63 to 11.02 GeV range, revealing oscillatory patterns.

Contribution

It provides the first experimental measurement of these specific cross sections over a broad energy range, using full reconstruction of $B$ mesons in multiple hadronic final states.

Findings

Observed oscillatory behavior in cross sections

Identified multiple maxima and minima in energy dependence

Used data from the Belle experiment at KEKB

Abstract

We report the first measurement of the exclusive cross sections $e^+e^-\to B\bar{B}$, $e^+e^-\to B\bar{B}^*$, and $e^+e^-\to B^*\bar{B}^*$ in the energy range from 10.63 GeV to 11.02 GeV. The $B$ mesons are fully reconstructed in a large number of hadronic final states and the three channels are identified using a beam-constrained-mass variable. The shapes of the exclusive cross sections show oscillatory behavior with several maxima and minima. The results are obtained using data collected by the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider.