The gluonic condensate from the hyperfine splitting $M_{\rm cog}(χ_{cJ})-M(h_c)$ in charmonium

Details The gluonic condensate from the hyperfine splitting $M_{\rm cog}(χ_{cJ})-M(h_c)$ in charmonium The gluonic condensate from the hyperfine splitting $M_{\rm cog}(χ_{cJ})-M(h_c)$ in charmonium

2004-12-02

arxiv.org/abs/hep-ph/0412030v1

Phys.Atom.Nucl. 69 (2006) 734-738

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages revtex 4, no figures

Scientific paper

The precision measurement of the hyperfine splitting $\Delta_{\rm HF} (1P, c\bar c)=M_{\rm cog} (\chi_{cJ}) - M(h_c) = -0.5 \pm 0.4$ MeV in the Fermilab--E835 experiment allows to determine the gluonic condensate $G_2$ with high accuracy if the gluonic correlation length $T_g$ is fixed. In our calculations the negative value of $\Delta_{\rm HF} = -0.3 \pm 0.4$ MeV is obtained only if the relatively small $T_g = 0.16$ fm and $G_2 = 0.065 (3)$ GeV${}^4$ are taken. These values correspond to the ``physical'' string tension $(\sigma \approx 0.18 $ GeV$^2$). For $T_g \ge 0.2$ fm the hyperfine splitting is positive and grows for increasing $T_g$. In particular for $T_g = 0.2$ fm and $G_2 = 0.041 (2)$ GeV${}^4$ the splitting $\Delta_{\rm HF} = 1.4 (2)$ MeV is obtained, which is in accord with the recent CLEO result.

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