X(3872), I^G(J^{PC})=0^+(1^{++}), as the \chi_{1c}(2P) charmonium

TL;DR

This paper proposes that the X(3872) resonance is a charmonium state, specifically \\chi_{c1}(2P), and explains its mass shift and decay properties through virtual D^*0\\bar D^0 intermediate states, offering testable experimental predictions.

Contribution

The paper introduces the hypothesis that X(3872) is a \\chi_{c1}(2P) charmonium state and models its mass shift and decay channels via virtual D^*0\\bar D^0 states, challenging the molecule or tetraquark interpretations.

Findings

Mass shift explained by virtual D^*0\\bar D^0 contributions.

Estimated coupling constants and branching ratios for X(3872) decays.

Predicted significant decay modes involving two gluons.

Abstract

Contrary to almost standard opinion that the X(3872) resonance is the D^{*0}\bar D^0+c.c. molecule or the qc\bar q\bar c four-quark state, we discuss the scenario where the X(3872)resonance is the c\bar c = \chi_{c1}(2P) charmonium which "sits on" the D^{*0}\bar D^0 threshold. We explain the shift of the mass of the X(3872) resonance with respect to the prediction of a potential model for the mass of the \chi_{c1}(2P) charmonium by the contribution of the virtual D^*\bar D+c.c. intermediate states into the self energy of the X(3872) resonance. This allows us to estimate the coupling constant of the X(7872) resonance with the D^{*0}\bar D^0 channel, the branching ratio of the X(3872) \to D^{*0}\bar D^0 + c.c. decay, and the branching ratio of the X(3872) decay into all non-D^{*0}\bar D^0 + c.c. states. We predict a significant number of unknown decays of X(3872) via two gluon:X(3872)\to gluon\ gluon\to hadrons. We suggest a physically clear program of experimental researches for verification of our assumption.