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Next-to-Next-to-Leading Order QCD Corrections to Polarized Semi-Inclusive Deep-Inelastic Scattering.
Phys Rev Lett
November 2024
The Institute of Mathematical Sciences, Taramani, 600113 Chennai, India.
Article Synopsis
- Polarized semi-inclusive deep-inelastic scattering (SIDIS) plays a crucial role in understanding the proton spin puzzle.
- The study presents comprehensive results for polarized SIDIS at next-to-next-to-leading order (NNLO) in quantum chromodynamics, covering all relevant interactions.
- A numerical analysis highlights the importance of NNLO corrections and demonstrates reduced scale dependence, particularly for the kinematics relevant to future electron-ion collider experiments.
Polarized Semi-Inclusive Deep-Inelastic Scattering at Next-to-Next-to-Leading Order in QCD.
Phys Rev Lett
November 2024
Università degli Studi di Milano-Bicocca and INFN, Piazza della Scienza 3, 20216 Milano, Italy.
Semi-inclusive hadron production in longitudinally polarized deep-inelastic lepton-nucleon scattering is a powerful tool for resolving the quark flavor decomposition of the proton's spin structure. We present the full next-to-next-to-leading order QCD corrections to the coefficient functions of polarized semi-inclusive deep-inelastic scattering (SIDIS) in analytical form, enabling the use of SIDIS measurements in precision studies of the proton spin structure. The numerical impact of these corrections is illustrated by a comparison with data of polarized single-inclusive hadron spectra from the DESY HERMES and CERN COMPASS experiments.
View Article and Find Full Text PDFParity and time-reversal violating nuclear forces with explicit -excitations.
Eur Phys J A Hadron Nucl
October 2024
Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
We emphasize the usefulness of treating delta resonances as explicit degrees of freedom in applications of chiral effective field theory (EFT) to parity-violating and time-reversal-violating (PVTV) nuclear interactions. Compared with the delta-less framework, the explicit inclusion of the delta isobar allows one to resum certain types of contributions to the PVTV two-pion exchange two- and three-nucleon potentials without at the same time introducing any unknown parameters up to next-to-next-to-leading order in the EFT expansion. We provide the corresponding expressions for the delta contributions in momentum and coordinate spaces and compare the convergence of the EFT expansion in both formulations.
View Article and Find Full Text PDFNext-to-Next-to-Leading Order Global Analysis of Polarized Parton Distribution Functions.
Phys Rev Lett
October 2024
Departamento de Física and IFIBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 1 (1428) Buenos Aires, Argentina.
We present a next-to-next-to-leading order (NNLO) global QCD analysis of the proton's helicity parton distribution functions, the first of its kind. To obtain the distributions, we use data for longitudinal spin asymmetries in inclusive and semi-inclusive lepton-nucleon scattering as well as in weak-boson and hadron or jet production in proton-proton scattering. We analyze the data using QCD perturbation theory at NNLO accuracy, employing approximations provided by the threshold resummation formalism in cases where full NNLO results for partonic hard-scattering functions are not readily available.
View Article and Find Full Text PDFImpact of correlations on nuclear binding energies: Ab initio calculations of singly and doubly open-shell nuclei.
Eur Phys J A Hadron Nucl
October 2024
Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
A strong effort will be dedicated in the coming years to extend the reach of ab initio nuclear-structure calculations to heavy doubly open-shell nuclei. In order to do so, the most efficient strategies to incorporate dominant many-body correlations at play in such nuclei must be identified. With this motivation in mind, the present work analyses the step-by-step inclusion of many-body correlations and their impact on binding energies of Calcium and Chromium isotopes.
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