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High Energy Physics - Lattice

arXiv:1606.06420 (hep-lat)
[Submitted on 21 Jun 2016]

Title:Colored-hadron distribution in hadron scattering in SU(2) lattice QCD

Authors:Toru T. Takahashi, Yoshiko Kanada-En'yo
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Abstract:In color SU(2) lattice QCD, we investigate colored-diquark distributions in two-hadron scatterings by means of Bethe-Salpeter amplitudes on the lattice. With colored-diquark operators in the Coulomb gauge, we measure components of two colored diquarks realized as intermediate states via one gluon exchange (OGE) processes in hadron scattering. From the colored-diquark distributions, we estimate the dominant range of gluon (color) exchanges between closely located two hadrons. We find that the colored-diquark components are enhanced at the short range ($\leq$0.2 fm) and their tails show the single-exponential damping. In order to distinguish the genuine colored-diquark components originating in the color exchange processes from trivial colored two-quark components contained in two color-singlet hadrons as a result of simple transformation of hadronic basis, we repeat the analyses on the artificially constructed gauge fields, where low- and high-momentum gluon components are decoupled and only restricted pair of quarks can share and exchange low-momentum gluons. We observe qualitatively the same behaviors and confirm that the short-range enhancement of the colored-diquark distributions is the genuine OGE-origin color excitation in hadron scattering.
Comments: 10 pages, 13 figures
Subjects: High Energy Physics - Lattice (hep-lat); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1606.06420 [hep-lat]
  (or arXiv:1606.06420v1 [hep-lat] for this version)
  https://doi.org/10.48550/arXiv.1606.06420
Journal reference: Phys. Rev. D 94, 094011 (2016)
Related DOI: https://doi.org/10.1103/PhysRevD.94.094011

Submission history

From: Toru T. Takahashi [view email]
[v1] Tue, 21 Jun 2016 04:40:16 UTC (67 KB)
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