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Title: Hadronic γZ box corrections in Møller scattering

Abstract

The possibility of measuring the parity-violating asymmetry in Moller scattering with sufficient accuracy to determine sin 2Θ W to 0.1% offers a complementary path to the discovery of new physics to that followed at high energy colliders. We present a new calculation of the γZ box contribution to parity-violating electron-proton scattering, which constitutes an important uncertainty in computing the background to this process. In addition, we show that while the γZ correction grows rapidly with energy, it can be relatively well constrained by data from parity-violating inelastic scattering and parton distribution functions.

Authors:
 [1]; ORCiD logo [2];  [3];  [1];  [1]
  1. Univ. of Adelaide, SA (Australia)
  2. Univ. of Manitoba, Winnipeg, MB (Canada)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1209713
Alternate Identifier(s):
OSTI ID: 1127207
Report Number(s):
JLAB-THY-13-1821; DOE/OR/23177-2900; arXiv:1311.3389
Journal ID: ISSN 0370-2693; TRN: US1600996
Grant/Contract Number:
AC05-06OR23177
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 731; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; parity violation; weak charge of the proton; Moller scattering; parity-violating inelastic scattering

Citation Formats

Hall, N. L., Blunden, P. G., Melnitchouk, W., Thomas, A. W., and Young, R. D. Hadronic γZ box corrections in Møller scattering. United States: N. p., 2014. Web. doi:10.1016/j.physletb.2014.02.049.
Hall, N. L., Blunden, P. G., Melnitchouk, W., Thomas, A. W., & Young, R. D. Hadronic γZ box corrections in Møller scattering. United States. doi:10.1016/j.physletb.2014.02.049.
Hall, N. L., Blunden, P. G., Melnitchouk, W., Thomas, A. W., and Young, R. D. Thu . "Hadronic γZ box corrections in Møller scattering". United States. doi:10.1016/j.physletb.2014.02.049.
@article{osti_1209713,
title = {Hadronic γZ box corrections in Møller scattering},
author = {Hall, N. L. and Blunden, P. G. and Melnitchouk, W. and Thomas, A. W. and Young, R. D.},
abstractNote = {The possibility of measuring the parity-violating asymmetry in Moller scattering with sufficient accuracy to determine sin2ΘW to 0.1% offers a complementary path to the discovery of new physics to that followed at high energy colliders. We present a new calculation of the γZ box contribution to parity-violating electron-proton scattering, which constitutes an important uncertainty in computing the background to this process. In addition, we show that while the γZ correction grows rapidly with energy, it can be relatively well constrained by data from parity-violating inelastic scattering and parton distribution functions.},
doi = {10.1016/j.physletb.2014.02.049},
journal = {Physics Letters. Section B},
number = C,
volume = 731,
place = {United States},
year = {Thu Feb 27 00:00:00 EST 2014},
month = {Thu Feb 27 00:00:00 EST 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2014.02.049

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • The possibility of measuring the parity-violating asymmetry in Moller scattering with sufficient accuracy to determine sin 2Θ W to 0.1% offers a complementary path to the discovery of new physics to that followed at high energy colliders. We present a new calculation of the γZ box contribution to parity-violating electron-proton scattering, which constitutes an important uncertainty in computing the background to this process. In addition, we show that while the γZ correction grows rapidly with energy, it can be relatively well constrained by data from parity-violating inelastic scattering and parton distribution functions.
  • In this study, we examine the interferencemore » $$\gamma Z$$ box corrections to parity-violating elastic electron-proton scattering in the light of the recent observation of quark-hadron duality in parity-violating deep-inelastic scattering from the deuteron at low $Q^2$. Using the similarity of electromagnetic and $$\gamma Z$$ structure function moments and those extracted from leading twist parton distributions down to $$Q^2 \approx 1$$~GeV$^2$, we find that duality constrains the $$\gamma Z$$ box correction to $$\Re \square_{\gamma Z}^V = (5.4 \pm 0.4) \times 10^{-3}$$ at the kinematics of the Q-weak experiment. Within the same model we also provide estimates of the $$\gamma Z$$ corrections for future experiments, such as MOLLER at Jefferson Lab and MESA at Mainz.« less
  • We use dispersion relations to evaluate the γZ box contribution to parity-violating electron scattering in the forward limit, taking into account constraints from recent JLab data on electroproduction in the resonance region as well as high energy data from HERA. The correction to the asymmetry is found to be 1.2 +- 0.2% at the kinematics of the JLab Q weak experiment, which is well within the limits required to achieve a 4% measurement of the weak charge of the proton.
  • We update the calculation of γZ interference corrections to the weak charge of the proton. We show how constraints from parton distributions, together with new data on parity-violating electron scattering in the resonance region, significantly reduce the uncertainties on the corrections compared to previous estimates.