Measurement of Resonance Parameters of Orbitally Excited Narrow B^0 Mesons

TL;DR

This paper presents the most precise measurements to date of the masses and width of orbitally excited narrow B^0 mesons, using data from the CDF II detector at Fermilab, advancing understanding of heavy meson spectroscopy.

Contribution

The study provides the first measurement of the B^{*0}_2 width and the most precise mass measurements of the B^0 excited states, improving upon previous experimental results.

Findings

Measured B^{*0}_2 mass as 5740.2 MeV/c^2

Determined B^{*0}_2 width to be 22.7 MeV/c^2

Calculated mass difference between B^{*0}_2 and B^0_1 as 14.9 MeV/c^2

Abstract

We report a measurement of resonance parameters of the orbitally excited (L=1) narrow B^0 mesons in decays to B^{(*)+}\pi^- using 1.7/fb of data collected by the CDF II detector at the Fermilab Tevatron. The mass and width of the B^{*0}_2 state are measured to be m(B^{*0}_2) = 5740.2^{+1.7}_{-1.8}(stat.) ^{+0.9}_{-0.8}(syst.) MeV/c^2 and \Gamma(B^{*0}_2) = 22.7^{+3.8}_{-3.2}(stat.) ^{+3.2}_{-10.2}(syst.) MeV/c^2. The mass difference between the B^{*0}_2 and B^0_1 states is measured to be 14.9^{+2.2}_{-2.5}(stat.) ^{+1.2}_{-1.4}(syst.) MeV/c^2, resulting in a B^0_1 mass of 5725.3^{+1.6}_{-2.2}(stat.) ^{+1.4}_{-1.5}(syst.) MeV/c^2. This is currently the most precise measurement of the masses of these states and the first measurement of the B^{*0}_2 width.