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https://hdl.handle.net/2440/29074
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Type: | Conference paper |
Title: | Distortions in the negative energy Dirac sea: Violation of the Gottfried sum rule and Du in the proton |
Author: | Tsushima, K. Thomas, A. Dunne, G. |
Citation: | Proceedings of the Workshop on Lepton Scattering, Hadrons and QCD, 2001 / Melnitchouk, W., Schreiber, A., Thomas, A., Tandy, P. (ed./s), pp.29-36 |
Part of: | Proceedings of the Workshop on Lepton Scattering, Hadrons and QCD |
Publisher: | WORLD SCIENTIFIC PUBLISHING CO PTE LTD |
Publisher Place: | SINGAPORE |
Issue Date: | 2001 |
ISBN: | 9810247494 |
Conference Name: | Workshop on Lepton Scattering, Hadrons and QCD (2001 : Adelaide, South Australia) |
Editor: | Melnitchouk, W. Schreiber, A. Thomas, A. Tandy, P. |
Abstract: | We report on recent work concerning the effect which the change in vacuum structure (negative energy Dirac sea), in the presence of a confining scalar field, has on the nucleon structure functions and parton distributions. Using the Dirac equation in 1+1 dimensions, we show that distortions in the Dirac sea are responsible for part of the violation of the Gottfried sum rule -- i.e., part of the flavor asymmetry in the proton sea. Our basic argument is that, even if isospin is an exact symmetry, the presence of a confining potential changes the vacuum structure, and inevitably leads to a violation of SU(2) flavour symmetry in a hadron with a different number of valence $u$ and $d$ quarks. The same mechanism also leads to a prediction for $\Delta\bar{u}$ and $\Delta\bar{d}$. |
DOI: | 10.1142/9789812799708_0004 |
Published version: | http://dx.doi.org/10.1142/9789812799708_0004 |
Appears in Collections: | Aurora harvest 2 Special Research Centre for the Subatomic Structure of Matter publications |
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