First exclusive reconstruction of the B$^{*+}$, B$^{*0}$, and B$^{*0}_\text{s}$ mesons and precise measurement of their masses

TL;DR

This paper reports the first full reconstruction and precise mass difference measurements of the B*+ , B*0 , and B*0_s mesons using CMS data from 2016-2018, significantly improving measurement accuracy.

Contribution

It provides the first complete reconstruction of three vector B meson states and measures their mass differences with unprecedented precision.

Findings

Mass differences are measured with high precision.

Results improve previous measurements by an order of magnitude.

First full reconstruction of these B meson states.

Abstract

Using proton-proton collision data collected by the CMS experiment at $\sqrt{s}$ = 13 TeV in 2016$-$2018, corresponding to an integrated luminosity of 140 fb$^{-1}$, the first full reconstruction of the three vector B meson states, B$^{*+}$, B$^{*0}$, and B$^{*0}_\text{s}$, is performed. The mass differences between the excited mesons and their corresponding ground states are measured to be $m(\text{B}^{*+}) - m(\text{B}^+)$ = 45.277 $\pm$ 0.039 $\pm$ 0.027 MeV, $m(\text{B}^{*0}) - m(\text{B}^0)$ = 45.471 $\pm$ 0.056 $\pm$ 0.028 MeV, and $m(\text{B}^{*0}_\text{s}) - m(\text{B}_\text{s})$ = 49.407 $\pm$ 0.132 $\pm$ 0.041 MeV, where the first uncertainties are statistical and the second are systematic. These results improve on the precision of previous measurements by an order of magnitude.