Abstract
The recent experimental determination of the Gottfried sum rule of deep inelastic scattering provides strong evidence that SU(2) flavor symmetry is broken by the sea quark distributions of the nucleon. Two mechanisms have been suggested to explain the data: Pauli blocking and non-perturbative contributions to the sea arising from the pion cloud surrounding the nucleon. We investigate the effects of these two mechanisms on several standard parametrizations of the quark distribution functions and find that each mechanism has different effects on the shapes of these distribution functions. The best agreement between the experimental data and the modified quark distributions occurs when both mechanisms are taken into account using a softπNN form factor and a small Pauli correction.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Eichten, E., Hinchliffe, I., Lane, K., Quigg, C.: Rev. Mod. Phys.56, 579 (1984)
Abramowicz, H., et al. (CDHS): Z. Phys. C —Particles and Fields15, 19 (1982); ibid.17, 1283 (1983)
Bergsma, F., et al. (CHARM): Phys. Lett.123B, 269 (1983)
Gottfried, K.: Phys. Rev. Lett.18, 1174 (1967)
Field, R.D., Feynman, R.P.: Phys. Rev. D15, 2590 (1977)
The NMC, XII Int. conf. on particles and nuclei (PANIC 1990), Cambridge MA, USA, 1990
Ratcliffe, P.G., Soffer, J.: MITH 90/11 (1990) CPT-90/PE.2417. Phys. Rev. Lett.: (to be published)
Martin, A.D., Stirling, W.J., Roberts, R.G.: Phys. Lett. B252, 653 (1990)
Signal, A.I., Schreiber, A.W., Thomas, A.W.: Mod. Phys. Lett. A6, 271 (1991)
Kumano, S.: Phys. Rev. D43, 59 (1991) Kumano, S., Londergan, J.T.: IUCF preprint IU/NTC 90-16 (1990)
Signal, A.I., Thomas, A.W.: Phys. Rev. D40, 2832 (1989); Phys. Lett. B221, 481 (1988)
Thomas, A.W.: Prog. Theor. Phys. [Suppl.]91, 204 (1987)
Ericson, M., Thomas, A.W.: Phys. Lett.148B, 191 (1984)
Sullivan, J.D.: Phys. Rev. D5, 1732 (1972)
Machleidt, R., Holinde, K., Elster, Ch.: Phys. Rep.149, 1 (1987)
Thomas, A.W.: Phys. Lett.126B, 97 (1983)
Frankfurt, L.L., Mankiewicz, L., Strikman, M.I.: Z. Phys. A —Atoms and Nuclei334, 343 (1989)
Llewellyn-Smith, C.H.: Nucl. Phys. A434, 35c (1985)
Berger, E.L., Coester, F., Wiringa, R.B.: Phys. Rev. D29, 398 (1984)
Llewellyn-Smith, C.H.: Phys. Lett.128B, 107 (1983); Ericson, M., Thomas, A.W.: Phys. Lett.128B, 112 (1983)
Theberge, S., Miller, G.A., Thomas, A.W.: Can. J. Phys.60, 59 (1982)
Eisele, F.: In: Proceedings of the 21st international conference on high energy physics, Petiau, P., Porneuf, M. (eds.), J. Phys. (Paris)43 [Suppl. 12] C3–337 (1982)
Martin, A.D., Roberts, R.G., Stirling, W.J.: Phys. Lett. B206, 327 (1988)
Harriman, P.N., Martin, A.D., Stirling, W.J., Roberts, R.G.: Phys. Rev. D42, 798 (1990)
Duke, D.W., Owens, J.F.: Phys. Rev. D30, 49 (1984)
Thomas, A.W., Holinde, K.: Phys. Rev. Lett.63, 2025 (1989); Holinde, K., Thomas, A.W.: Phys. Rev. C42, R1195 (1990)
Deister, S., Gari, M.F., Krumpelmann, W., Mahlke, M.: Bochum Preprint (to be published in Few Body Systems)
Frankfurt, L., Strikman, M.: Phys. Rep.160, 235 (1988)
Le Yaouanc, A., Oliver, L., Pène, O., Reynard, J.C.: Phys. Rev. D9, 2636 (1974)
Jaffe, R.L.: Phys. Rev. D11, 1953 (1975); Jaffe, R.L., Ross, G.G.: Phys. Lett. B93, 313 (1980)
Cabbibo, N., Petronzio, R.: Nucl. Phys. B137, 395 (1978)
Benesh, C.J., Miller, G.A.: Phys. Rev. D36, 1344 (1987); Phys. Lett. B215, 381 (1988)
Glück, M., Reya, E.: Z. Phys. C — articles and Fields43, 679 (1989)
Schreiber, A.W., Thomas, A.W., Londergan, J.T.: Phys. Lett. B237, 120 (1990)
Author information
Authors and Affiliations
Additional information
We would like to thank A.W. Schreiber for helpful discussions. This work was supported by a grant from the Australian Research Council.