Nuclear modification difference between u(v) and d(v) distributions and its relation to the NuTeV sin(2)theta(W) anomaly

作者：Hirai M^*; Kumano S; Nagai TH

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, 71(11): 113007.

DOI：10.1103/PhysRevD.71.113007

We investigate a possible nuclear correction to the NuTeV measurement of the weak-mixing angle sin(2)theta(W). In particular, a nuclear modification difference between u(v) and d(v) distributions contributes to the NuTeV measurement with the iron target. First, the modification difference is determined by a chi(2) analysis so as to reproduce nuclear data on the structure function F-2 and Drell-Yan processes. Then, taking the NuTeV kinematics into account, we calculate a contribution to the sin(2)theta(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(2)theta(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.

• 出版日期2005-6