Parton distributions with LHC data

By R. Ball, Valerio Bertone, Stefano Carrazza, Christopher S.Deans, Luigi Del Debbio, S. Forte, Alberto Guffanti, Nathan P.Hartland, Jose I.Latorre, Juan Rojo and 1 more. 2012

2,453 citations recorded by the source corpus.

We present the first determination of parton distributions of the nucleon at NLO and NNLO based on a global data set which includes LHC data: NNPDF2.3. Our data set includes, besides the deep inelastic, Drell-Yan, gauge boson production and jet data already used in previous global PDF determinations, all the relevant LHC data for which experimental systematic uncertainties are currently available: ATLAS and LHCb W and Z rapidity distributions from the 2010 run, CMS W electron asymmetry data from the 2011 run, and ATLAS inclusive jet cross-sections from the 2010 run. We introduce an improved implementation of the FastKernel method which allows us to fit to this extended data set, and also to adopt a more effective minimization methodology. We present the NNPDF2.3 PDF sets, and compare them to the NNPDF2.1 sets to assess the impact of the LHC data. We find that all the LHC data are broadly consistent with each other and with all the older data sets included in the fit. We present predictions for various standard candle cross-sections, and compare them to those obtained previously using NNPDF2.1, and specifically discuss the impact of ATLAS electroweak data on the determination of the strangeness fraction of the proton. We also present collider PDF sets, constructed using only data from HERA, Tevatron and LHC, but find that this data set is neither precise nor complete enough for a competitive PDF determination.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/722ba503283ac59cc9007c57ca8c860866712eb2

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Citations in the corpus

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Performance of the ATLAS trigger system in 2015 (2016, methodology): “3LO [9] parton distribution function (PDF) set were used to study the photon and jet triggers.”
Measurement of the t-channel single-top-quarkproduction cross section and of the |Vtb| CKM matrixelement in pp collisions at √s = 8 TeV (2014, methodology): “The envelope of the CT10 [36], MSTW [8], and NNPDF [37] PDF sets is taken as uncertainty, according to the PDF4LHC recommendations [38].”
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PDF4LHC recommendations for LHC Run II (2015, methodology): “es A follow-up benchmarking study in 2012 was carried out with the NNLO versions of the most up-to-date PDF sets [13]. By that time, CTEQ6.6 had been replaced by CT10 [18,29] and NNPDF2.0 by NNPDF2.3 [30], both at NNLO. In addition, HERAPDF1.0 had been replaced by HERAPDF1.5 [31], and ABM09 by ABM11”
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B-physics anomalies: a guide to combined explanations (2017, positive): “3 [58] NLO PDF set, to calculate the relevant cross sections at LO in QCD in the 5-flavor scheme.”