$The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions$
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The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions

The cross section for deep inelastic lepton-proton scattering (DIS) ℓp→ℓ′X includes a diffractive deep inelastic (DDIS) contribution ℓp→ℓ′p′X, in which the proton remains intact with a large longitudinal momentum fraction xF greater than 0.9 and small transverse momentum. The DDIS events, which can...

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Autores principales:	Stanley J. Brodsky, Valery E. Lyubovitskij, Ivan Schmidt
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Deep inelastic scattering Diffractive deep inelastic scattering Parton distribution functions Momentum sum rules Physics QC1-999
Acceso en línea:	https://doaj.org/article/a74daba170f24b68b6e8dd7db29c1212
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spelling	oai:doaj.org-article:a74daba170f24b68b6e8dd7db29c12122021-12-04T04:32:48ZThe diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions0370-269310.1016/j.physletb.2021.136801https://doaj.org/article/a74daba170f24b68b6e8dd7db29c12122022-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321007413https://doaj.org/toc/0370-2693The cross section for deep inelastic lepton-proton scattering (DIS) ℓp→ℓ′X includes a diffractive deep inelastic (DDIS) contribution ℓp→ℓ′p′X, in which the proton remains intact with a large longitudinal momentum fraction xF greater than 0.9 and small transverse momentum. The DDIS events, which can be identified with Pomeron exchange in the t-channel, account for approximately 10% of all of the DIS events. Thus, when one measures DIS, one automatically includes the leading-twist Bjorken-scaling DDIS events as a contribution to the DIS cross section, whether or not the final-state proton p′ is detected. In such events, the missing momentum fraction xp′∼0.9 carried by the final-state proton p′ in the DDIS events could be misidentified with the light-front momentum fraction carried by sea quarks or gluons in the protons' Fock structure. As we shall show in this article, the underlying QCD Pomeron-exchange amplitude which produces the DDIS events does not obey the operator product expansion nor satisfy momentum sum rules. Thus we conclude that the quark and gluon distributions measured in DIS experiments will be misidentified, unless the measurements explicitly exclude the DDIS events and that a correct determination of the parton distribution functions (PDFs) derived from the DIS data requires the explicit subtraction of the DDIS contribution from the full DIS cross section.Stanley J. BrodskyValery E. LyubovitskijIvan SchmidtElsevierarticleDeep inelastic scatteringDiffractive deep inelastic scatteringParton distribution functionsMomentum sum rulesPhysicsQC1-999ENPhysics Letters B, Vol 824, Iss , Pp 136801- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Deep inelastic scattering Diffractive deep inelastic scattering Parton distribution functions Momentum sum rules Physics QC1-999
spellingShingle	Deep inelastic scattering Diffractive deep inelastic scattering Parton distribution functions Momentum sum rules Physics QC1-999 Stanley J. Brodsky Valery E. Lyubovitskij Ivan Schmidt The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
description	The cross section for deep inelastic lepton-proton scattering (DIS) ℓp→ℓ′X includes a diffractive deep inelastic (DDIS) contribution ℓp→ℓ′p′X, in which the proton remains intact with a large longitudinal momentum fraction xF greater than 0.9 and small transverse momentum. The DDIS events, which can be identified with Pomeron exchange in the t-channel, account for approximately 10% of all of the DIS events. Thus, when one measures DIS, one automatically includes the leading-twist Bjorken-scaling DDIS events as a contribution to the DIS cross section, whether or not the final-state proton p′ is detected. In such events, the missing momentum fraction xp′∼0.9 carried by the final-state proton p′ in the DDIS events could be misidentified with the light-front momentum fraction carried by sea quarks or gluons in the protons' Fock structure. As we shall show in this article, the underlying QCD Pomeron-exchange amplitude which produces the DDIS events does not obey the operator product expansion nor satisfy momentum sum rules. Thus we conclude that the quark and gluon distributions measured in DIS experiments will be misidentified, unless the measurements explicitly exclude the DDIS events and that a correct determination of the parton distribution functions (PDFs) derived from the DIS data requires the explicit subtraction of the DDIS contribution from the full DIS cross section.
format	article
author	Stanley J. Brodsky Valery E. Lyubovitskij Ivan Schmidt
author_facet	Stanley J. Brodsky Valery E. Lyubovitskij Ivan Schmidt
author_sort	Stanley J. Brodsky
title	The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
title_short	The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
title_full	The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
title_fullStr	The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
title_full_unstemmed	The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions
title_sort	diffractive contribution to deep inelastic lepton-proton scattering: implications for qcd momentum sum rules and parton distributions
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/a74daba170f24b68b6e8dd7db29c1212
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The diffractive contribution to deep inelastic lepton-proton scattering: Implications for QCD momentum sum rules and parton distributions

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