Nuclear modification difference between u{sub v} and d{sub v} distributions and its relation to the NuTeV sin{sup 2}{theta}{sub W} anomaly
- Institute of Particle and Nuclear Studies, KEK, 1-1, Ooho, Tsukuba, Ibaraki, 305-0801 (Japan)
- Department of Physics, Saga University, Saga, 840-8502 (Japan)
We investigate a possible nuclear correction to the NuTeV measurement of the weak-mixing angle sin{sup 2}{theta}{sub W}. In particular, a nuclear modification difference between u{sub v} and d{sub v} distributions contributes to the NuTeV measurement with the iron target. First, the modification difference is determined by a {chi}{sup 2} analysis so as to reproduce nuclear data on the structure function F{sub 2} and Drell-Yan processes. Then, taking the NuTeV kinematics into account, we calculate a contribution to the sin{sup 2}{theta}{sub W} determination. In addition, its uncertainty is estimated by the Hessian method. Although the uncertainty becomes comparable to the NuTeV deviation, the effect is not large enough to explain the whole NuTeV sin{sup 2}{theta}{sub W} anomaly at this stage. However, it is difficult to determine such a nuclear modification difference, so that we need further investigations on the difference and its effect on the NuTeV anomaly.
- OSTI ID:
- 20709438
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 11; Other Information: DOI: 10.1103/PhysRevD.71.113007; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Precision measurement of sin(squared) {theta}{sub W} from {nu}-N scattering at NuTeV and direct measurements of M{sub W}
Isovector EMC Effect and the NuTeV Anomaly