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First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12
- Source :
- Physical Review Letters, Phys.Rev.Lett., Phys.Rev.Lett., 2023, 130 (2), pp.022501. ⟨10.1103/PhysRevLett.130.022501⟩
- Publication Year :
- 2023
- Publisher :
- HAL CCSD, 2023.
-
Abstract
- We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin\Delta\phi$ modulations in $ep \rightarrow e'p\pi^+X$ events, where $\Delta\phi$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.<br />Comment: 7 pages, 6 figures
- Subjects :
- angular distribution: asymmetry
hydrogen: liquid
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
electron: polarized beam
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]
polarization: longitudinal
FOS: Physical sciences
General Physics and Astronomy
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
spin: dependence
hadron: transverse momentum
transverse momentum dependence
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
hard scattering
CLAS
deep inelastic scattering
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
structure
Nuclear Experiment (nucl-ex)
Nuclear Experiment
hydrogen: target
dihadron: electroproduction
Settore FIS/04
modulation
correlation
spectrometer
hadronization
photon: virtual
Jefferson Lab
experimental results
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Phys.Rev.Lett., Phys.Rev.Lett., 2023, 130 (2), pp.022501. ⟨10.1103/PhysRevLett.130.022501⟩
- Accession number :
- edsair.doi.dedup.....fa63df5f28fb56d36b6a42507f2689e7