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Isovector EMC effect and the NuTeV anomaly
I C Cloët1, W Bentz, A W Thomas
1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
Physical Review Letters
|August 8, 2009
Summary
An excess of neutrons or protons in nuclei creates a mean field that shifts quark distributions. This provides a new interpretation for the NuTeV anomaly, suggesting medium modifications of nucleon wave functions.
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- The NuTeV experiment measured sin2thetaW, revealing a potential anomaly.
- Nuclear matter contains an isovector-vector mean field due to neutron or proton excess.
Purpose of the Study:
- To investigate the impact of the isovector-vector mean field on quark distributions.
- To explain the NuTeV anomaly by considering medium modifications of nucleons.
Main Methods:
- Theoretical analysis of quark distributions in nuclear matter.
- Calculations within a covariant and confining Nambu-Jona-Lasinio model.
Main Results:
- The isovector-vector mean field causes a shift in quark distributions.
- This shift leads to a model-independent correction reducing the NuTeV measurement of sin2thetaW.
- The vector field correction could significantly explain the NuTeV anomaly.
Conclusions:
- The NuTeV anomaly may be evidence for medium modifications of bound nucleon wave functions.
- This study offers a new interpretation of the NuTeV measurement within nuclear physics.
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