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μ-p scattering and the glue fraction of the proton

Politzer, H. David (1977) μ-p scattering and the glue fraction of the proton. Nuclear Physics B, 122 (2). pp. 237-252. ISSN 0550-3213. doi:10.1016/0550-3213(77)90205-X.

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The QCD version of the energy-momentum sum rule is tested against SLAC electroproduction and FNAL muon-proton scattering data. While providing only a single number for each Q2, the energy momentum sum rule is significant because the scaling violations due to gluons can be well determined. In particular, gluons carry 30±8% of the proton's energy-momentum at Q2=3.5 GeV2 (which means 22% at 1 GeV2). The largest single corrections of previous estimates of the glue fraction is the inclusion of gluon bremsstrahlung effects. Agreement with experiment is within the uncertainties in the μ-p data. However, the sum rule does not give a very sensitive test of the value of the quark-gluon coupling constant. The prediction for charm production agrees with the observed rates for dimuon and trimuon production in inelastic μ scattering.

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Politzer, H. David0000-0002-4983-6621
Additional Information:Copyright © 1977 Published by Elsevier B.V. Research supported in part by the National Science Foundation under Grant no. PHY75-20427.
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Issue or Number:2
Record Number:CaltechAUTHORS:20160920-085821234
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70453
Deposited By: Joy Painter
Deposited On:20 Sep 2016 22:11
Last Modified:11 Nov 2021 04:29

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