Document Type
Article
Department/Program
Physics
Journal Title
Physical Review Letters
Pub Date
2009
Volume
102
Issue
25
Abstract
A neutron or proton excess in nuclei leads to an isovector-vector mean field which, through its coupling to the quarks in a bound nucleon, implies a shift in the quark distributions with respect to the Bjorken scaling variable. We show that this result leads to an additional correction to the NuTeV measurement of sin(2)theta(W). The sign of this correction is largely model independent and acts to reduce their result. Explicit calculation in nuclear matter within a covariant and confining Nambu-Jona-Lasinio model predicts that this vector field correction may account for a substantial fraction of the NuTeV anomaly. We are therefore led to offer a new interpretation of the NuTeV measurement, namely, that it provides further evidence for the medium modification of the bound nucleon wave function.
Recommended Citation
Cloet, I. C.; Bentz, W.; Thomas, A. W.; and Thomas, A. W., Isovector EMC Effect and the NuTeV Anomaly (2009). Physical Review Letters, 102(25).
10.1103/PhysRevLett.102.252301
DOI
10.1103/PhysRevLett.102.252301
