Implementation of target mass corrections and higher-twist effects in the xFitter framework

Abstract

Knowledge of parton distribution functions (PDFs) at large momentum fraction $x$ is not only important to study the flavor and spin dynamics of quarks in the nucleon, but also to search for signals of new physics at collider experiments. It is well known now that the nonperturbative QCD effects generally play a more significant role at such kinematic regions. In this work, we present an open-source QCD analysis of PDFs considering target mass corrections (TMCs) and higher-twist (HT) effects which are necessary when the analysis includes also data points from deep inelastic scattering (DIS) with larger values of $x$ and smaller values of photon virtuality $Q^2$. To this aim, we use the xFitter package, as a comprehensive and powerful tool for studying PDFs. We report and discuss our recent activities on the implementation of TMCs and HT effects in the xFitter framework in a user-friendly way, so that the user can switch on or off them, and also choose between different options. We check the validity of the modifications by performing sample analyses of PDFs considering TMCs and HT effects and using a wide range of DIS data.

arXiv comment27 pages, 4 figures, 2 Tables, Accepted for Publication in Physical Review D

References in corpus (60)

• Parton distributions for the LHC
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Parton distributions from high-precision collider data
• PDF4LHC recommendations for LHC Run II
• New parton distribution functions from a global analysis of quantum chromodynamics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Implications of CTEQ global analysis for collider observables
• Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction
• The p_T Spectrum in Heavy-Flavour Hadroproduction
• Saturation in Diffractive Deep Inelastic Scattering
• New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
• Combined Measurement and QCD Analysis of the Inclusive ep Scattering Cross Sections at HERA
• Leptoproduction of Heavy Quarks II -- A Unified QCD Formulation of Charged and Neutral Current Processes from Fixed-target to Collider Energies
• Parton Distribution Functions, ${\alpha }_s$ and Heavy-Quark Masses for LHC Run II
• The p_T Spectrum in Heavy-Flavour Photoproduction
• Measurement of the proton and deuteron structure functions, F2p and F2d, and of the ratio sigma(L)/sigma(T)
• APFEL: A PDF Evolution Library with QED corrections
• Constraints on large-$x$ parton distributions from new weak boson production and deep-inelastic scattering data
• Heavy quarks in deep-inelastic scattering
• An Ordered Analysis of Heavy Flavour Production in Deep Inelastic Scattering
• Parton distributions and lattice QCD calculations: a community white paper
• The Structure of the Proton in the LHC Precision Era
• Leptoproduction of Heavy Quarks I-- General Formalism and Kinematics of Charged Current and Neutral Current Production Processes
• A Variable-Flavour Number Scheme for NNLO
• Treatment of Heavy Quarks in Deeply Inelastic Scattering
• Distribution Functions of the Nucleon and Pion in the Valence Region
• Parton distributions from deep-inelastic-scattering data
• CTEQ6 Parton Distributions with Heavy Quark Mass Effects
• Determination of the strange quark density of the proton from ATLAS measurements of the W->l nu and Z->ll cross sections
• Delineating parton distributions and the strong coupling
• Neutron/Proton Structure Function Ratio at Large x
• Target Mass Corrections for Polarized Structure Functions and New Sum Rules
• A Review of Target Mass Corrections
• Effect of changes of variable flavor number scheme on parton distribution functions and predicted cross sections
• The Theory of Deeply Inelastic Scattering
• Scheme dependence, leading order and higher twist studies of MRST partons
• NLO PDFs from the ABMP16 fit
• Heavy-quark deep-inelastic scattering with a running mass
• Tau neutrino deep inelastic charged current interactions
• Target mass effects in polarized deep-inelastic scattering
• New parton distributions from large-x and low-Q^2 data
• Proton structure from a light-front Hamiltonian
• Applications of quark-hadron duality in F2 structure function
• Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass
• Higher Twist Contributions to the Structure Functions F_2^p(x,Q^2) and F_2^d(x,Q^2) at Large x and Higher Orders
• Collinear factorization for deep inelastic scattering structure functions at large Bjorken xB
• Next-to leading order analysis of target mass corrections to structure functions and asymmetries
• Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects
• Modeling Lepton-Nucleon Inelastic Scattering from High to Low Momentum Transfer
• Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models
• Resummation of target mass corrections in two-photon processes: twist-two sector
• Parton distributions in the presence of target mass corrections
• Target mass corrections for virtual Compton scattering at twist-2 and generalized, non-forward Wandzura-Wilczek and Callan-Gross relations
• Target mass and finite $t$ corrections to diffractive deeply inelastic scattering
• Hadron mass corrections in semi-inclusive deep-inelastic scattering
• Hadron mass corrections in semi-inclusive deep inelastic scattering
• Role of higher twist effects in diffractive DIS and determination of diffractive parton distribution functions
• QCD effective charges and the structure function $F_2$ at small-$x$: Higher twist effects
• Improved determination of $\bar{d}(x)-\bar{u}(x)$ flavor asymmetry in the proton by BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai
• Parton distribution functions with QED corrections in the valon model

Cited by in corpus (3)

• Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme
• Yadism: Yet Another Deep-Inelastic Scattering Module
• Higher twists effects in DIS on nuclei at the EIC and LHeC: A phenomenological analysis