The Strange Quark Contribution to the Proton’s Magnetic Moment

Spayde, D.T.; Averett, T.; Barkhuff, D.; Beck, D.H.; Beise, E.J.; Breuer, H.; Carr, R.; Covrig, S.; Dodson, G.; Dow, K.; Farkhondeh, M.; Filippone, B.W.; Franklin, W.; Hasty, R.; Ito, T.M.; Korsch, W.; Kowalski, S.; McKeown, R.D.; Mueller, B.; Pitt, M.L.; Ramsey-Musolf, M.J.; Ritter, J.; Tieulent, R.; Tsentalovich, E.; Wells, S.P.; Yang, B.; Zwart, T.

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Date

2004-03

Author

Spayde, D.T.

Averett, T.

Barkhuff, D.

Beck, D.H.

Beise, E.J.

Breuer, H.

Carr, R.

Covrig, S.

Dodson, G.

Dow, K.

Farkhondeh, M.

Filippone, B.W.

Franklin, W.

Hasty, R.

Ito, T.M.

Korsch, W.

Kowalski, S.

McKeown, R.D.

Mueller, B.

Pitt, M.L.

Ramsey-Musolf, M.J.

Ritter, J.

Tieulent, R.

Tsentalovich, E.

Wells, S.P.

Yang, B.

Zwart, T.

Citation

Spayde, D.T. et al. "The Strange Quark Contribution to the Proton's Magnetic Moment." Physics Review Letters B 583 (2004): 79-86.

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Abstract

We report a new determination of the strange quark contribution to the proton’s magnetic form factor at a four-momentum transfer Q2 = 0.1(GeV/c)2 from parity-violating e-p elastic scattering. The result uses a revised analysis of data from the SAMPLE experiment which was carried out at the MIT-Bates Laboratory. The data are combined with a calculation of the proton’s axial form factor GeA to determine the strange form factor GsM (Q2=0.1)=0.37±0.20±0.26±0.07. The extrapolation of GsM to its Q2 = 0 limit and comparison with calculations is also discussed.