Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data

R.D. Ball; V. Begone; F. Cerutti; L. Del Debbio; S. Forte; Alberto Guffanti; N.P. Hartland; J.I. Latorre; J. Rojo; M. Ubiali

doi:10.1016/j.nuclphysb.2011.10.018

Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data

R.D. Ball, V. Begone, F. Cerutti, L. Del Debbio, S. Forte, Alberto Guffanti, N.P. Hartland, J.I. Latorre, J. Rojo, M. Ubiali

Experimental Particle Physics

106 Citations (Scopus)

Abstract

We develop in more detail our reweighting method for incorporating new datasets in parton fits based on a Monte Carlo representation of PDFs. After revisiting the derivation of the reweighting formula, we show how to construct an unweighted PDF replica set which is statistically equivalent to a given reweighted set. We then use reweighting followed by unweighting to test the consistency of the method, specifically by verifying that results do not depend on the order in which new data are included in the fit via reweighting. We apply the reweighting method to study the impact of LHC W lepton asymmetry data on the NNPDF2.1 set. We show how these data reduce the PDF uncertainties of light quarks in the medium and small x region, providing the first solid constraints on PDFs from LHC data.

Original language	English
Journal	Nuclear Physics B
Volume	855
Issue number	3
Pages (from-to)	608-638
Number of pages	30
ISSN	0550-3213
DOIs	https://doi.org/10.1016/j.nuclphysb.2011.10.018
Publication status	Published - 21 Feb 2012

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10.1016/j.nuclphysb.2011.10.018

Cite this

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title = "Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data",

abstract = "We develop in more detail our reweighting method for incorporating new datasets in parton fits based on a Monte Carlo representation of PDFs. After revisiting the derivation of the reweighting formula, we show how to construct an unweighted PDF replica set which is statistically equivalent to a given reweighted set. We then use reweighting followed by unweighting to test the consistency of the method, specifically by verifying that results do not depend on the order in which new data are included in the fit via reweighting. We apply the reweighting method to study the impact of LHC W lepton asymmetry data on the NNPDF2.1 set. We show how these data reduce the PDF uncertainties of light quarks in the medium and small x region, providing the first solid constraints on PDFs from LHC data.",

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T1 - Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data

AU - Ball, R.D.

AU - Begone, V.

AU - Cerutti, F.

AU - Del Debbio, L.

AU - Forte, S.

AU - Guffanti, Alberto

AU - Hartland, N.P.

AU - Latorre, J.I.

AU - Rojo, J.

AU - Ubiali, M.

PY - 2012/2/21

Y1 - 2012/2/21

N2 - We develop in more detail our reweighting method for incorporating new datasets in parton fits based on a Monte Carlo representation of PDFs. After revisiting the derivation of the reweighting formula, we show how to construct an unweighted PDF replica set which is statistically equivalent to a given reweighted set. We then use reweighting followed by unweighting to test the consistency of the method, specifically by verifying that results do not depend on the order in which new data are included in the fit via reweighting. We apply the reweighting method to study the impact of LHC W lepton asymmetry data on the NNPDF2.1 set. We show how these data reduce the PDF uncertainties of light quarks in the medium and small x region, providing the first solid constraints on PDFs from LHC data.

AB - We develop in more detail our reweighting method for incorporating new datasets in parton fits based on a Monte Carlo representation of PDFs. After revisiting the derivation of the reweighting formula, we show how to construct an unweighted PDF replica set which is statistically equivalent to a given reweighted set. We then use reweighting followed by unweighting to test the consistency of the method, specifically by verifying that results do not depend on the order in which new data are included in the fit via reweighting. We apply the reweighting method to study the impact of LHC W lepton asymmetry data on the NNPDF2.1 set. We show how these data reduce the PDF uncertainties of light quarks in the medium and small x region, providing the first solid constraints on PDFs from LHC data.

U2 - 10.1016/j.nuclphysb.2011.10.018

DO - 10.1016/j.nuclphysb.2011.10.018

M3 - Journal article

SN - 0550-3213

VL - 855

SP - 608

EP - 638

JO - Nuclear Physics, Section B

JF - Nuclear Physics, Section B

IS - 3

ER -

Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data

Abstract

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