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High Energy Physics - Lattice

arXiv:hep-lat/0509113 (hep-lat)
[Submitted on 23 Sep 2005]

Title:Searching for diquarks in hadrons

Authors:C. Alexandrou, Ph de Forcrand, B. Lucini
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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 $m_{\pi} \simeq 830$ MeV, our data show unambiguously that a scalar diquark forms with a size of $\simeq$ 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.
Comments: 6 pages, 2 figures, Talk presented at Lattice 2005 (Hadron spectrum and quark masses)
Subjects: High Energy Physics - Lattice (hep-lat); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:hep-lat/0509113
  (or arXiv:hep-lat/0509113v1 for this version)
  https://doi.org/10.48550/arXiv.hep-lat/0509113
Journal reference: PoS LAT2005 (2005) 053

Submission history

From: Biagio Lucini [view email]
[v1] Fri, 23 Sep 2005 16:59:45 UTC (73 KB)
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