Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprq11009h&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #Q11.009
Physics
Scientific paper
Gaussian QCD sum-rules (GSRs) are well-suited to a study of meson-glueball mixing due to their balanced sensitivity to ground and excited states. The GSRs corresponding to both diagonal and non-diagonal (crossed) two-point correlators between scalar-isoscalar (non-strange) quark currents and gluonic currents will be presented. For the crossed correlator, we show that perturbative and gluon condensate contributions are chirally-suppressed as compared to non-perturbative effects of the quark condensate, mixed condensate, and instantons, implying that the mixing of quark mesons and gluonium is of a non-perturbative origin. Independent predictions of the masses and relative coupling strengths stemming from the three GSRs (two diagonal and one non-diagonal) are remarkably consistent with a scenario of two states with masses of approximately 1;GeV and 1.4;GeV that couple to significant mixtures of quark and gluonic currents. The mixing is nearly maximal with the heavier mixed state having a slightly larger gluonium content than the lighter state.
Harnett Derek
Kleiv Robin
Moats Ken
Steele Tom
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