# Observation of two excited B$^+_\mathrm{c}$ states and measurement of the B$^+_\mathrm{c}$(2S) mass in pp collisions at $\sqrt{s} =$ 13 TeV

## TL;DR

This paper reports the first observation of two excited Bc+ states in proton-proton collisions at 13 TeV, measuring their masses and confirming their existence with high statistical significance.

## Contribution

The study provides the first experimental evidence of two excited Bc+ states and measures their mass difference and individual masses, advancing understanding of heavy meson spectroscopy.

## Key findings

- Two excited Bc+ states observed with >5 sigma significance
- Mass difference between states measured as 29.1 MeV
- Mass of Bc+(2S) measured as 6871.0 MeV

## Abstract

Signals consistent with the B$^+_\mathrm{c}$(2S) and B$^{*+}_\mathrm{c}$(2S) states are observed in proton-proton collisions at $\sqrt{s} =$ 13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb$^{-1}$, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited $\bar{\mathrm{b}}$c states are observed in the B$^+_\mathrm{c}\pi^+\pi^-$ invariant mass spectrum, with the ground state B$^+_\mathrm{c}$ reconstructed through its decay to J/$\psi\,\pi^+$. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1 $\pm$ 1.5 (stat) $\pm$ 0.7 (syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the B$^+_\mathrm{c}$(2S) meson is measured to be 6871.0 $\pm$ 1.2 (stat) $\pm$ 0.8 (syst) $\pm$ 0.8 (B$^+_\mathrm{c}$) MeV, where the last term corresponds to the uncertainty in the world-average B$^+_\mathrm{c}$ mass.