Implications of Hadron Collider Observables on Parton Distribution Function Uncertainties
نویسنده
چکیده
Standard parton distribution function sets do not have rigorously quantified uncertainties. In recent years it has become apparent that these uncertainties play an important role in the interpretation of hadron collider data. In this paper, using the framework of statistical inference, we illustrate a technique that can be used to efficiently propagate the uncertainties to new observables, assess the compatibility of new data with an initial fit, and, in case the compatibility is good, include the new data in the fit.
منابع مشابه
ar X iv : 0 80 9 . 09 44 v 1 [ he p - ph ] 5 S ep 2 00 8 Implications of CTEQ PDF analysis for collider observables ∗
In the context of a recent CTEQ6.6 global analysis, we review a new technique for studying correlated theoretical uncertainties in hadronic observables associated with imperfect knowledge of parton distribution functions (PDFs). The technique is based on the computation of correlations between the predicted values of physical observables in the Hessian matrix method. It can be used, for example...
متن کاملar X iv : 0 80 9 . 09 44 v 2 [ he p - ph ] 7 S ep 2 00 8 Implications of CTEQ PDF analysis for collider observables ∗
In the context of a recent CTEQ6.6 global analysis, we review a new technique for studying correlated theoretical uncertainties in hadronic observables associated with imperfect knowledge of parton distribution functions (PDFs). The technique is based on the computation of correlations between the predicted values of physical observables in the Hessian matrix method. It can be used, for example...
متن کاملHeavy Quark Mass Effects in Deep Inelastic Scattering and Global QCD Analysis
A new implementation of the general PQCD formalism of Collins, including heavy quark mass effects, is described. Important features that contribute to the accuracy and efficiency of the calculation of both neutral current (NC) and charged current (CC) processess are explicitly discussed. This new implementation is applied to the global analysis of the full HERA I data sets on NC and CC cross se...
متن کاملUncertainties of predictions from parton distribution functions . I . The Lagrange multiplier method
We apply the Lagrange multiplier method to study the uncertainties of physical predictions due to the uncertainties of parton distribution functions ~PDF’s!, using the cross section sW for W production at a hadron collider as an archetypal example. An effective x function based on the CTEQ global QCD analysis is used to generate a series of PDF’s, each of which represents the best fit to the gl...
متن کاملNew Generation of Parton Distributions with Uncertainties from Global QCD Analysis
A new generation of parton distribution functions with increased precision and quantitative estimates of uncertainties is presented. This work significantly extends previous CTEQ and other global analyses on two fronts: (i) a full treatment of available experimental correlated systematic errors for both new and old data sets; (ii) a systematic and pragmatic treatment of uncertainties of the par...
متن کامل