## On-line version ISSN 1678-4448

#### Abstract

MATHEUS, R. D.. X (3872) in QCD sum rules. Braz. J. Phys. [online]. 2007, vol.37, n.1a, pp.63-66. ISSN 1678-4448.  http://dx.doi.org/10.1590/S0103-97332007000100020.

QCD spectral sum rules is used to test the nature of the meson X(3872), assumed to be an exotic four-quark $(c\bar{c}q\bar{q})$ state with JPC = 1++. For definiteness, the current proposed recently by Maiani et al [1] is used, at leading order in as, considering the contributions of higher dimension condensates. The value MX = (3.94±0.11) GeV is found which is compatible, within the errors, with the experimental candidate X(3872). The uncertainties of our estimates are mainly due to the one from the c quark mass.

Keywords : QCD sum rules; Tetraquarks; Axial vector mesons.

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