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Transverse Force Distributions in the Proton from Lattice QCD.
Phys Rev Lett
February 2025
The University of Adelaide, CSSM, Department of Physics, Adelaide SA, 5005, Australia.
Single-spin asymmetries observed in polarized deep-inelastic scattering are important probes of hadron structure. The Sivers asymmetry has been the focus of much attention in QCD phenomenology and is yet to be understood at the quark level. In this Letter, we present a lattice QCD calculation of the spatial distribution of a color-Lorentz force acting on the struck quark in a proton.
View Article and Find Full Text PDFFirst 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.
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 PDFNeuropeptide signalling orchestrates T cell differentiation.
Nature
November 2024
Gene Lay Institute of Immunology and Inflammation, Brigham and Women's Hospital, Mass General Hospital and Harvard Medical School, Boston, MA, USA.
Article Synopsis
- The study investigates how the balance between T helper type 1 (T1) and other T cell types is maintained, which is crucial for effective antiviral and anti-tumor responses.
- Researchers utilized a specialized culture system and CRISPR screens to uncover regulators that influence T cell differentiation, focusing on the role of RAMP3 and its interactions with the neuropeptide CGRP.
- Findings reveal that after viral infection, neuron-produced CGRP enhances T1 and CD8 T cell responses via RAMP3, creating a neuroimmune circuit that aids in controlling acute viral infections.
High-Statistics Measurement of Collins and Sivers Asymmetries for Transversely Polarized Deuterons.
Phys Rev Lett
September 2024
Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries of charged hadrons produced in deep inelastic scattering of muons on a transversely polarized ^{6}LiD target. The data were taken in 2022 with the COMPASS spectrometer using the 160 GeV muon beam at CERN, statistically balancing the existing data on transversely polarized proton targets. The first results from about two-thirds of the new data have total uncertainties smaller by up to a factor of three compared to the previous deuteron measurements.
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