What are the low-Q and large-x boundaries of collinear QCD factorization theorems?

We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit of available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z boson production. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matching to fixed-order calculations at high transverse momentum. We introduce specific choices to deal with TMD evolution at low scales, of the order of 1 GeV 2 . This could be considered as a first attempt at a global fit of TMDs.

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“…The reliability of the theoretical description of SIDIS at low Q 2 has been recently discussed in Refs. [39,40].…”

Section: Formalism a Semi-inclusive Dismentioning

confidence: 99%

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Bacchetta

Delcarro

Pisano

et al. 2017

J. High Energ. Phys.

217

239

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“…the x range [x min , x max ] where x min and x max are the minimum and maximum x values of the resonance region in x for each Q 2 , Eqs. (9), and from the integrals in the x range [0, x min ], calculated using the CT10 PDFs [52].…”

Section: Resultsmentioning

confidence: 99%

“…At large x QCD factorization theorems have been applied under the assumption that small-coupling techniques can be used [9]. The largest x values, however, can be reached experimentally in electron proton scattering with Q 2 in the multi-GeV region and low final state invariant mass, W 2 .…”

Section: Introductionmentioning

confidence: 99%

Bernstein Polynomials based Probabilistic Interpretation of Quark Hadron Duality

Askanazi,

Liuti

2017

Preprint

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It is now widely recognized that large Bjorken x data play an important role in global analyses of Parton Distribution Functions (PDFs) even at collider energies, through perturbative QCD evolution. For values of the scale of the reaction, Q 2 , in the multi-GeV region the structure functions at large x present resonance structure. Notwithstanding, these data can be incorporated in the analyses by using quark-hadron duality or approximate scaling of the structure function data averaged over their resonance structure. Several averaging methods have been proposed using either the PDFs Mellin moments, or their truncated moments. We propose an alternative method using Bernstein polynomials integrals, or Bernstein moments. Bernstein moments render a smooth form of the structure function in the resonance region. Furthermore, being based on a different averaging criterion than the methods adopted so far, they provide a new framework for understanding the possible mechanisms giving origin to the phenomenon of quark-hadron duality.

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“…These measurements will provide precise data on the hadronic and nuclear bound states involved in hadron-hadron collisions and neutrino-nucleus interactions. In particular, understanding the validity of factorization theorems and probing their kinematic boundaries [1234,1235] amounts to crucial tests of QCD and is essential to improving the interface between high-accuracy perturbative QCD calculations and non-perturbative inputs.…”

Section: Importance Of the Eic Physics Programmentioning

confidence: 99%

Event generators for high-energy physics experiments

Campbell,

Diefenthaler,

Hobbs

et al. 2024

SciPost Phys.

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We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. Particular emphasis is given to physics models and algorithms that are employed across a variety of experiments. These common themes in event generator development lead to a more comprehensive understanding of physics at the highest energies and intensities, and allow models to be tested against a wealth of data that have been accumulated over the past decades. A cohesive approach to event generator development will allow these models to be further improved and systematic uncertainties to be reduced, directly contributing to future experimental success. Event generators are part of a much larger ecosystem of computational tools. They typically involve a number of unknown model parameters that must be tuned to experimental data, while maintaining the integrity of the underlying physics models. Making both these data, and the analyses with which they have been obtained accessible to future users is an essential aspect of open science and data preservation. It ensures the consistency of physics models across a variety of experiments.

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What are the low-Q and large-x boundaries of collinear QCD factorization theorems?

Abstract: We demonstrate testing QCD factorization theorems using a simple quantum field theory. Specifically we test standard collinear factorization in order to better explore deeply inelastic scattering (DIS) at lower Q and larger Bjorken x.

Cited by 3 publications

References 1 publication

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Bernstein Polynomials based Probabilistic Interpretation of Quark Hadron Duality

Event generators for high-energy physics experiments

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