Nuclear antishadowing in neutrino deep inelastic scattering
- Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
- Departamento de Fisica, Universidad Technica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile)
The shadowing and antishadowing of nuclear structure functions in the Gribov-Glauber picture is due, respectively, to the destructive and constructive interference of amplitudes arising from the multiple scattering of quarks in the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron and Odderon contributions from multigluon exchange as well as Reggeon quark-exchange contributions. We show that the coherence of these multiscattering nuclear processes leads to shadowing and antishadowing of the electromagnetic nuclear structure functions in agreement with measurements. This picture leads to substantially different antishadowing for charged and neutral current reactions, thus affecting the extraction of the weak-mixing angle {theta}{sub W}. We find that part of the anomalous NuTeV result for {theta}{sub W} could be due to the nonuniversality of nuclear antishadowing for charged and neutral currents. Detailed measurements of the nuclear dependence of individual quark structure functions are thus needed to establish the distinctive phenomenology of shadowing and antishadowing and to make the NuTeV results definitive.
- OSTI ID:
- 20698171
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 70, Issue 11; Other Information: DOI: 10.1103/PhysRevD.70.116003; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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