Isovector EMC Effect and the NuTeV Anomaly

I. C. Cloët, W. Bentz, and A. W. Thomas
Phys. Rev. Lett. 102, 252301 – Published 26 June 2009

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 sin2θW. 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.

  • Figure
  • Figure
  • Received 28 January 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.252301

©2009 American Physical Society

Authors & Affiliations

I. C. Cloët1, W. Bentz2, and A. W. Thomas3

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
  • 2Department of Physics, School of Science, Tokai University, Hiratsuka-shi, Kanagawa 259-1292, Japan
  • 3Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA and College of William and Mary, Williamsburg, Virginia 23187, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 102, Iss. 25 — 26 June 2009

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×