An analysis of the impact of LHC Run I proton–lead data on nuclear parton densities
Armesto, N., Paukkunen, H., Penin, J. M., Salgado, C. A., & Zurita, P. (2016). An analysis of the impact of LHC Run I proton–lead data on nuclear parton densities. European Physical Journal C, 76(4), Article 218. https://doi.org/10.1140/epjc/s10052-016-4078-9
Julkaistu sarjassa
European Physical Journal CPäivämäärä
2016Tekijänoikeudet
© The Author(s) 2016. This article is published with open access at Springerlink.com and distributed under the terms of the Creative Commons Attribution 4.0 International License. Funded by SCOAP3.
We report on an analysis of the impact of available
experimental data on hard processes in proton–lead collisions
during Run I at the large hadron collider on nuclear
modifications of parton distribution functions. Our analysis
is restricted to the EPS09 and DSSZ global fits. The measurements
that we consider comprise production of massive
gauge bosons, jets, charged hadrons and pions. This is the first
time a study of nuclear PDFs includes this number of different
observables. The goal of the paper is twofold: (i) checking
the description of the data by nPDFs, as well as the relevance
of these nuclear effects, in a quantitative manner; (ii) testing
the constraining power of these data in eventual global
fits, for which we use the Bayesian reweighting technique.
We find an overall good, even too good, description of the
data, indicating that more constraining power would require
a better control over the systematic uncertainties and/or the
proper proton–proton reference from LHC Run II. Some of
the observables, however, show sizeable tension with specific
choices of proton and nuclear PDFs. We also comment on
the corresponding improvements as regards the theoretical
treatment.
...
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1434-6044Asiasanat
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