Phys. Rev. Lett. 99, 122003 (2007) [4 pages]

Testing the Standard Model by Precision Measurement of the Weak Charges of Quarks

Abstract

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R. D. Young^1,2, R. D. Carlini^1,3, A. W. Thomas^1,3, and J. Roche^1,4
¹Jefferson Lab, 12000 Jefferson Ave., Newport News, Virginia 23606, USA
²Special Research Centre for the Subatomic Structure of Matter, and Department of Physics, University of Adelaide, Adelaide SA 5005, Australia
³College of William and Mary, Williamsburg, Virginia 23187, USA
⁴Ohio University, Athens, Ohio 45071, USA

Received 23 April 2007; published 20 September 2007

In a global analysis of the latest parity-violating electron scattering measurements on nuclear targets, we demonstrate a significant improvement in the experimental knowledge of the weak neutral-current lepton-quark interactions at low energy. The precision of this new result, combined with earlier atomic parity-violation measurements, places tight constraints on the size of possible contributions from physics beyond the standard model. Consequently, this result improves the lower-bound on the scale of relevant new physics to ∼1 TeV.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.99.122003

DOI:

10.1103/PhysRevLett.99.122003

PACS:

13.60.−r, 12.15.Mm, 24.80.+y

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Phys. Rev. Lett. 99, 122003 (2007) [4 pages]

Testing the Standard Model by Precision Measurement of the Weak Charges of Quarks