Hadronic molecule structure of the Y(3940) and Y(4140)

TL;DR

This paper provides evidence that the Y(3940) and Y(4140) are heavy hadron molecules with specific quantum numbers, supported by decay predictions and a phenomenological approach, advancing understanding of their structure.

Contribution

It introduces a molecular interpretation for Y(3940) and Y(4140), with new decay width predictions supporting this hypothesis.

Findings

Y(3940) is a superposition of D*+D*- and D*0D*0 states

Y(4140) is a bound state of Ds*+ and Ds*- mesons

Decay predictions support the molecular structure hypothesis

Abstract

We report on further evidence that the Y(3940) and the recently observed Y(4140) are heavy hadron molecule states with quantum numbers J(PC) = 0(++). The Y(3940) state is considered to be a superposition of D*(+)D*(-) and D*(0) barD*(0), while the Y(4140) is a bound state of Ds*(+) and Ds*(-) mesons. For the first time we give predictions for the strong Y(3940) to Jpsi omega, Y(4140) to Jpsi phi and radiative Y(3940)/Y(4140) to gamma gamma decay widths in a phenomenological Lagrangian approach. Results for the strong Jpsi V (V = omega, phi) decays clearly support the molecular interpretation of the Y(3940) and Y(4140).