期刊
PHYSICS LETTERS B
卷 665, 期 4, 页码 139-146出版社
ELSEVIER
DOI: 10.1016/j.physletb.2008.05.070
关键词
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资金
- Science and Technology Facilities Council [PP/E000444/1, PP/E006442/1] Funding Source: researchfish
- STFC [PP/E006442/1] Funding Source: UKRI
A first measurement is reported of the longitudinal proton structure function FL(X, Q(2)) at the ep collider HERA. It is based on inclusive deep inelastic e(+)p scattering cross section measurements with a positron beam energy of 27.5 GeV and proton beam energies of 920, 575 and 460 GeV. Employing the energy dependence of the cross section, FL is measured in a range of squared four-momentum transfers 12 <= Q2 <=, 90 GeV2 and low Bjorken x 0.00024 <= x <= 0.0036. The F-L values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA. (C) 2008 Elsevier B.V. All rights reserved.
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