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

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106 Citationer (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.

Originalsprog	Engelsk
Tidsskrift	Nuclear Physics B
Vol/bind	855
Udgave nummer	3
Sider (fra-til)	608-638
Antal sider	30
ISSN	0550-3213
DOI	https://doi.org/10.1016/j.nuclphysb.2011.10.018
Status	Udgivet - 21 feb. 2012

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10.1016/j.nuclphysb.2011.10.018

Citationsformater

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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.",

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

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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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