Next-to-leading order analysis of target mass corrections to structure functions and asymmetries

Brady, Lucas T.; Accardi, Alberto; Hobbs, Tim; Melnitchouk, Wally

doi:10.1103/physrevd.84.074008

Cited by 38 publications

(14 citation statements)

References 58 publications

(109 reference statements)

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“…represents the leading-twist structure function, and a fitted coefficient, C(x) = αx β (1 + γx), parametrizes the power-suppressed twist-4 corrections. On the other hand, targetmass corrections of O(M 2 N /Q 2 ) are due to the non-negligible mass, M N , of the struck nucleon, and are implemented via the operator product expansion of Georgi and Politzer [58,59] or related prescriptions, as extensively reviewed in [60,61]. Both corrections are natively implemented in the CJ framework.…”

Section: B Power-suppressed Effectsmentioning

confidence: 99%

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

et al. 2021

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Experimental measurements in deep-inelastic scattering and lepton-pair production on deuterium targets play an important role in the flavor separation of u and d (anti)quarks in global QCD analyses of the parton distribution functions (PDFs) of the nucleon. We investigate the impact of theoretical corrections accounting for the light-nuclear structure of the deuteron upon the fitted u, d-quark, gluon, and other PDFs in the CJ15 and CT18 families of next-to-leading order CTEQ global analyses. The investigation is done using the $$L_2$$ L 2 sensitivity statistical method, which provides a common metric to quantify the strength of experimental constraints on various PDFs and ratios of PDFs in the two distinct fitting frameworks. Using the $$L_2$$ L 2 sensitivity and other approaches, we examine the compatibility of deuteron data sets with other fitted experiments under varied implementations of the deuteron corrections. We find that freely-fitted deuteron corrections modify the PDF uncertainty at large momentum fractions and will be relevant for future PDFs affecting electroweak precision measurements.

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Section: B Power-suppressed Effectsmentioning

confidence: 99%

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

et al. 2021

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“…A number of these structure-function level prescriptions have been computed and reviewed in Refs. [39,40]. For example, there can be substantial variation in F L , depending upon the specific prescription.…”

Section: Contributions To the Photon Pdf And Its Uncertaintymentioning

confidence: 99%

The photon PDF within the CT18 global analysis

Xie,

Hobbs,

Hou

et al. 2021

Preprint

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Building upon the most recent CT18 global fit, we present a new calculation of the photon content of the proton based on an application of the LUX formalism. In this work, we explore two principal variations of the LUX ansatz. In one approach, which we designate "CT18lux," the photon PDF is calculated directly using the LUX formula for all scales, µ. In an alternative realization, "CT18qed," we instead initialize the photon PDF in terms of the LUX formulation at a lower scale, µ ∼ µ 0 , and evolve to higher scales with a combined QED+QCD kernel at O(α), O(αα s ) and O(α 2 ). While we find these two approaches generally agree, especially at intermediate x (10 −3 x 0.3), we discuss some moderate discrepancies that can occur toward the end-point regions at very high or low x. We also study effects that follow from variations of the inputs to the LUX calculation originating outside the pure deeply-inelastic scattering (DIS) region, including from elastic form factors and other contributions to the photon PDF. Finally, we investigate the phenomenological implications of these photon PDFs for the LHC, including high-mass Drell-Yan, vector-boson pair, top-quark pair, and Higgs associated with vector-boson production.

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“…In inclusive electronproton scattering, the transition from the low-energy resonance region to the high-energy regime (i.e. DIS) offers broad grounds for exploration [489,491,[497][498][499][500][501][502][503][504]. Leading twist approximations 6 are found to be accurate at describing the region of invariant masses W above the resonances, at sufficiently large photon virtualities, Q 2 1-2 GeV 2 .…”

Section: Nucleon Resonance Contributions To Inclusive Electron Scatte...mentioning

confidence: 99%

Novel approaches in Hadron Spectroscopy

Albaladejo,

Bibrzycki,

Dawid

et al. 2021

Preprint

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The last two decades have witnessed the discovery of a myriad of new and unexpected hadrons. The future holds more surprises for us, thanks to new-generation experiments. Understanding the signals and determining the properties of the states requires a parallel theoretical effort. To make full use of available and forthcoming data, a careful amplitude modeling is required, together with a sound treatment of the statistical uncertainties, and a systematic survey of the model dependencies. We review the contributions made by the Joint Physics Analysis Center to the field of hadron spectroscopy.

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Next-to-leading order analysis of target mass corrections to structure functions and asymmetries

Cited by 38 publications

References 58 publications

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

Deuterium scattering experiments in CTEQ global QCD analyses: a comparative investigation

The photon PDF within the CT18 global analysis

Novel approaches in Hadron Spectroscopy

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