Journal article
Combination of measurements of inclusive deep inelastic e±p scattering cross sections and QCD analysis of HERA data
- Abstract:
- A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current e±p scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb−1 and span six orders of magnitude in negative four-momentum-transfer squared, Q2, and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in αs(MZ)=0.1183±0.0009(exp)±0.0005(model/parameterisation)±0.0012(hadronisation)+0.0037−0.0030(scale). An extraction of xFγZ3 and results on electroweak unification and scaling violations are also presented.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 7.2MB, Terms of use)
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- Publisher copy:
- 10.1140/epjc/s10052-015-3710-4
Authors
- Publisher:
- Springer Berlin Heidelberg
- Journal:
- European Physical Journal C: Particles and Fields More from this journal
- Volume:
- 75
- Article number:
- 580
- Publication date:
- 2015-01-01
- DOI:
- EISSN:
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1434-6052
- ISSN:
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1434-6044
- Pubs id:
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pubs:577363
- UUID:
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uuid:838d896f-2e1f-4a4b-9021-5f3040854388
- Local pid:
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pubs:577363
- Source identifiers:
-
577363
- Deposit date:
-
2015-12-01
Terms of use
- Copyright holder:
- H1 and ZEUS Collaborations
- Copyright date:
- 2015
- Notes:
-
Copyright © The Author(s) 2015. This article is distributed under the terms of the Creative
Commons Attribution 4.0 International License (http://creativecomm
ons.org/licenses/by/4.0/), which permits unrestricted use, distribution,
and reproduction in any medium, provided you give appropriate credit
to the original author(s) and the source, provide a link to the Creative
Commons license, and indicate if changes were made.
Funded by SCOAP3.
- Licence:
- CC Attribution (CC BY)
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