Fl. Stancu

Can Y(4140) be a tetraquark

In this exploratory study the spectrum of tetraquarks of type is calculated within a simple quark model with chromomagnetic interaction and effective quark masses extracted from meson and baryon spectra. It is tempting to see if this spectrum can accommodate the resonance Y(4140), observed by the CDF Collaboration, but not yet confirmed. The results seem to favor the JPC = 1++ sector where the coupling to the VV channel is nearly as small as that of X(3872), when described as a tetraquark. This suggests that Y(4140) could possibly be the strange partner of X(3872) in a tetraquark interpretation. However, the sector JPC = 0++ cannot entirely be excluded. This work questions the practice of extracting effective quark masses containing spin-independent contributions, from mesons and baryons, to be used in multiquark systems as well.In this exploratory study the spectrum of tetraquarks of type

Microscopic and proximity nucleus-nucleus potentials

c \bar c s \bar s

Tetraquarks with colour-blind forces in chiral quark models

is calculated within a simple quark model with chromomagnetic interaction and effective quark masses extracted from meson and baryon spectra. It is tempting to see if this spectrum can accommodate the resonance Y(4140), observed by the CDF collaboration, but not yet confirmed. The results seem to favour the J

On the scalar meson exchange in the baryon spectra

^{PC}

Negative parity non-strange baryons

= 1

Unified Skyrme approach to the real and imaginary parts of the heavy-ion optical potential

^{++}

Separable single-particle potential in shell-model calculations extended to the continuum

sector where the coupling to the VV channel is nearly as small as that of X(3872), when described as a

Scalar meson exchange and the baryon spectra

c \bar c q \bar q

Excited

tetraquark. This suggests that Y(4140) could possibly be the strange partner of X(3872), in a tetraquark interpretation. However the sector J

[{\bf 70, \ell^+}]

^{PC}