Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum in an unquenched quark model

Mercoledi 27 marzo, alle ore 16 in sala consiglio la d.ssa Elena Santopinto (INFN-Genova) terra' un seminario dal titolo:
Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum in an unquenched quark model.

Abstract:
Calculation of the charmonium spectrum with self energy corrections due to the coupling to the meson-meson continuum are presented in an unquenched quark model. The bare masses used in the calculation are computed within the relativized quark model by Godfrey and Isgur. The strong decay widths of 3S, 2P , 1D and 2D cc states are used in order to set the values of the 3P0 pair-creation model?s parameters we use to compute the vertex functions of the loop integrals. Finally, the nature of the X(3872) resonance is analyzed and the main possibilities (cc state or DD molecule) are discussed. According to our results, the X(3872) is compatible with the meson c1(2P), with JPC = 1++, and is thus interpreted as a cc core plus higher Fock components due to the coupling to the meson-meson continuum. These JPC = 1++ quantum numbers are in agreement with the experimental results found by the LHCb collaboration. In our view, the X(3872)?s mass is lower than the quark models predictions because of self energy shifts.

Persona di contatto:Pietro Colangelo   This email address is being protected from spambots. You need JavaScript enabled to view it.

Telefono:0039 0805443210

Relatore:D.ssa E. Santopinto