Heavy quark meson spectroscopy at CDF

TL;DR

This paper presents precise measurements of the X(3872) meson and reports evidence for a new narrow structure, Y(4140), in heavy quark meson spectroscopy at CDF, challenging conventional charmonium interpretations.

Contribution

It provides the most precise X(3872) mass measurement and reports evidence for a new Y(4140) state, expanding understanding of heavy quark mesons.

Findings

X(3872) signal consistent with a single state

Most precise X(3872) mass measurement

Evidence for Y(4140) decaying to J/psi phi

Abstract

From a study of the X(3872) mass and width based on the world's largest sample of $X(3872)\to J/\psi\pi^+\pi^-$ decays, we find that our X(3872) signal is consistent with a single state, and leads to the most precise measurement of the X(3872) mass. We also report the recent evidence for a new narrow structure, Y(4140), decaying to the $J/\psi \phi$ final state, in exclusive $B^+\to J/\psi\phi K^+$ decays in a data sample corresponding to an integrated luminosity of 2.7 \ifb collected at the CDF II detector. This narrow structure with its mass well above open charm pairs is unlikely to be a candidate for a conventional charmonium state.