Is X(3872) {\sl Really} a Molecular State?

Details Is X(3872) {\sl Really} a Molecular State? Is X(3872) {\sl Really} a Molecular State?

2008-01-23

arxiv.org/abs/0801.3540v3

Eur.Phys.J.C56:63-73,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 7 figures, 9 tables. The version to appear in EPJC

Scientific paper

10.1140/epjc/s10052-008-0640-4

After taking into account both the pion and sigma meson exchange potential, we have performed a dynamical calculation of the $D^0\bar{D}^{\ast0}$ system. The $\sigma$ meson exchange potential is repulsive from heavy quark symmetry and numerically important for a loosely bound system. Our analysis disfavors the interpretation of X(3872) as a loosely bound molecular state if we use the experimental $D^\ast D\pi$ coupling constant $g=0.59$ and a reasonable cutoff around 1 GeV, which is the typical hadronic scale. Bound state solutions with negative eigenvalues for the $D\bar{D}^\ast$ system exist only with either a very large coupling constant (two times of the experimental value) or a large cutoff ($\Lambda \sim 6$ GeV or $\beta \sim 6$ GeV$^2$). In contrast, there probably exists a loosely bound S-wave $B\bar{B}^\ast$ molecular state. Once produced, such a molecular state would be rather stable since its dominant decay mode is the radiative decay through $B^\ast\to B \gamma$. Experimental search of these states will be very interesting.

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