Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/physrevd.51.37 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron.
Phys Rev Lett
November 2024
Argonne National Laboratory, Argonne, Illinois 60439, USA.
Article Synopsis
- Measuring deeply virtual Compton scattering (DVCS) on the neutron is essential for understanding the nucleon's structure through generalized parton distributions (GPDs).
- Neutron targets help complement data obtained from polarized protons, particularly in determining the poorly understood GPD E, which is crucial for analyzing quark contributions to nucleon spin.
- The experiment utilized a longitudinally polarized electron beam at Jefferson Lab and the CLAS12 detector to measure DVCS on the neutron for the first time, providing new insights into quark-flavor separation of relevant Compton form factors.
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.
New Data-Driven Constraints on the Sign of Gluon Polarization in the Proton.
Phys Rev Lett
October 2024
University of Adelaide, CSSM and ARC Centre of Excellence for Dark Matter Particle Physics, Department of Physics, Adelaide 5005, Australia.
Article Synopsis
- - The potential existence of negative gluon helicity (Δg) has been found to align with current data from experiments like polarized proton-proton collisions and lattice QCD measurements.
- - A new analysis of polarized parton distributions in protons introduces constraints from high-x deep-inelastic scattering (DIS).
- - Results indicate that models incorporating negative Δg struggle to match high-x DIS data alongside other experimental data, implying that negative Δg may not be a viable solution.
Next-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 PDFFinal COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process.
Phys Rev Lett
August 2024
Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c π^{-} beam impinging on a transversely polarized ammonia target. Combining the data of both years, we present final results on the amplitudes of five azimuthal modulations, which correspond to transverse-spin-dependent azimuthal asymmetries (TSAs) in the dimuon production cross section. Three of them probe the nucleon leading-twist Sivers, transversity, and pretzelosity transverse-momentum dependent (TMD) parton distribution functions (PDFs).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!