Searching for diquarks in hadrons
Sep, 20056 pages
Published in:
- PoS LAT2005 (2006) 053
Contribution to:
e-Print:
- hep-lat/0509113 [hep-lat]
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Abstract:
Since the early days of QCD, it has been argued that inside hadrons quarks organise into substructures. Among those, popular pictures of various phenomena (including exotica and colour superconductivity) give a prominent role to diquarks, i.e. to colour antitriplet combinations of two quarks. Using a gauge-invariant setup, which combines the diquark with a static quark, we study spatial correlations of the two light quarks inside the diquark. After illustrating the setup, we discuss our first results for both the scalar (``good'') and the spin one (``bad'') diquark channels. In a regime in which MeV, our data show unambiguously that a scalar diquark forms with a size of 0.9 fm. For the vector diquark we are able to put a lower bound of 4.1(7) fm on its size. We also investigate the mass splitting between the good and the bad diquark: our findings are compatible with phenomenologically inspired predictions for this quantity.Note:
- 6 pages, 2 figures, Talk presented at Lattice 2005 (Hadron spectrum and quark masses)
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