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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.
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 PDFConstraint on an Exotic Parity-Odd Spin- and Velocity-Dependent Interaction with Atom Interferometer.
Phys Rev Lett
November 2024
MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF, and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Article Synopsis
- A high-precision test of the spin- and velocity-dependent (SVD) interaction between spin-polarized protons and unpolarized nucleons is conducted using a Bragg atom interferometer with ^{87}Rb atoms.
- The experiment enhances the precision of free fall measurements to 9.2×10^{-9}, significantly improving on earlier polarized atom experiments.
- It also provides a new constraint on the SVD interaction coupling, indicating greater sensitivity and opening new avenues for studying physics with polarized-atom interferometers.
Contribution of Protonation to the Dielectric Relaxation Arising from Bacteriopheophytin Reductions in the Photosynthetic Reaction Centers of .
Biomolecules
October 2024
Institute of Medical Physics, University of Szeged, 6720 Szeged, Hungary.
The pH dependence of the free energy level of the flash-induced primary charge pair PI was determined by a combination of the results from the indirect charge recombination of PQ and from the delayed fluorescence of the excited dimer (P*) in the reaction center of the photosynthetic bacterium , where the native ubiquinone at the primary quinone binding site Q was replaced by low-potential anthraquinone (AQ) derivatives. The following observations were made: (1) The free energy state of PI was pH independent below pH 10 (-370 ± 10 meV relative to that of the excited dimer P*) and showed a remarkable decrease (about 20 meV/pH unit) above pH 10. A part of the dielectric relaxation of the PI charge pair that is not insignificant (about 120 meV) should come from protonation-related changes.
View Article and Find Full Text PDFNew Constraints on Axion-Mediated Spin Interactions Using Magnetic Amplification.
Phys Rev Lett
November 2024
Helmholtz-Institut, GSI Helmholtzzentrum für Schwerionenforschung, Mainz 55128, Germany.
Article Synopsis
- Axions are theoretical particles that might explain dark matter and a specific physics problem (strong CP problem), and this study investigates their interactions using ^{129}Xe gas and Rb vapor.
- The method used enhances the detection sensitivity for these axion interactions by 145 times compared to traditional approaches through magnetic amplification and effective field exploitation.
- The research led to significant improvements in constraints on interactions related to axions, expanding the search for these particles and their potential links to dark matter, with implications for future investigations in this field.
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