Are There Diquarks in the Nucleon?

Details Are There Diquarks in the Nucleon? Are There Diquarks in the Nucleon?

2004-10-22

arxiv.org/abs/hep-ph/0410304v3

Phys.Rev. D71 (2005) 114010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version, accepted for publication on Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.114010

This work is devoted to the study of diquark correlations inside the nucleon. We analyze some matrix elements which encode information about the non-perturbative forces, in different color anti-triplet diquark channels. We suggest a lattice calculation to check the quark-diquark picture and clarify the role of instanton-mediated interactions. We study in detail the physical properties of the 0+ diquark, using the Random Instanton Liquid Model. We find that instanton forces are sufficiently strong to form a diquark bound-state, with a mass of ~500 MeV, which is compatible with earlier estimates. We also compute its electro-magnetic form factor and find that the diquark is a broad object, with a size comparable with that of the proton.

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