Heavy quark meson spectroscopy at CDF (X(3872) mass and evidence for Y(4140))

TL;DR

This paper reports the most precise mass measurement of X(3872) and presents evidence for a new resonance, Y(4140), in heavy quark meson spectroscopy using CDF II data.

Contribution

It provides the most accurate X(3872) mass measurement and first evidence of Y(4140) in J/psi phi decay mode at CDF.

Findings

Most precise X(3872) mass measurement to date

Evidence for Y(4140) resonance in J/psi phi decay

Observation of Y(4140) in B+ decays

Abstract

With growing datasets collected by the CDF II experiment, studies of the spectroscopy of mesons containing heavy quarks become more exciting. The CDF experiment has good capabilities in both charm and bottom sector. This capability allowed also to contribute to the study of the zoo of states called X,Y,Z. In this area we present a recent update of the mass measurement of X(3872). The result m(X(3872)) = 3871.61 +- 0.16 +- 0.19 MeV is currently the most precise measurement in the world. In addition, we report evidence for a new narrow resonance, Y(4140), the first to be seen in the J/psi phi decay mode, using 2.7 invfb of exclusive B+ to J/psi phi K+ decays.