# Photon 2015

15-19 June 2015
Asia/Novosibirsk timezone
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# Contribution Oral presentation

Resonances and exclusive processes

# About the physics of the X(3872) resonance

## Speakers

• Prof. Nikolay ACHASOV
• Ms. Elizaveta ROGOZINA

## Content

Enfant terrible of charmonium spectroscopy, the resonance X(3872), generated a stream of interpretations and ushered in a new exotic XYZ spectroscopy. In the meantime, many (if not all) characteristics of X(3872) are rather ambiguous. We construct spectra of decays of the resonance X(3872) with good analytical and unitary properties which allow to define the branching ratio of the X(3872) $to D^{star 0} bar D^{0}$ + c.c. decay studying only one more decay, for example, the $X(3872)topi+pi- J/psi(1S)$ decay. We next define the range of values of the coupling constant of the X(7872) resonance with the $D^{*0}bar D^0$ chanel. We show also that our spectra are effective means of selection of models for the resonance X(3872).

Contrary to almost standard opinion that the X(3872) resonance is the $D^{star 0}bar D^0+c.c.$ molecule or the $qcbar qbar c$ four-quark state, we prove the scenario where the X(3872) resonance is the $cbar c = chi_{c1}(2P)$ 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.

We suggest a physically clear program of experimental researches for verification of our assumption.