Isovector EMC effect explains the NuTeV anomaly

Details Isovector EMC effect explains the NuTeV anomaly Isovector EMC effect explains the NuTeV anomaly

2009-01-22

arxiv.org/abs/0901.3559v1

Phys.Rev.Lett.102:252301,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.102.252301

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 within a covariant and confining Nambu--Jona-Lasinio model predicts that this vector field correction accounts for approximately two-thirds of the NuTeV anomaly. We are therefore led to offer a new interpretation of the NuTeV measurement, namely, that it is further evidence for the medium modification of the bound nucleon wavefunction.

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