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Observation of Correlations between Spin and Transverse Momenta in Back-to-Back Dihadron Production at CLAS12

Avakian, H.
; 
Hayward, T.B.
; 
Kotzinian, A.
; 
Armstrong, W.R.
; ; 
Gayoso, C. Ayerbe
; 
Baashen, L.
; 
Baltzell, N.A.
; 
Barion, L.
; 
Bashkanov, M.
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Journal article
Date
2023-01-11
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Committee member
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Physics
Subject
Nuclear shapes and moments
 Nuclear structure & decays
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http://hdl.handle.net/20.500.12613/10838
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https://doi.org/10.1103/physrevlett.130.022501
Abstract
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction in the deep inelastic scattering process. In this reaction, two hadrons are produced in opposite hemispheres along the 𝑧 axis in the virtual photon-target nucleon 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 nonzero sin⁡Δ⁢𝜙 modulations in 𝑒⁢𝑝→𝑒′⁢𝑝⁢𝜋+⁢𝑋 events, where Δ⁢𝜙 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 unexplored 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.
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American Physical Society (APS)
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Physical Review Letters, Vol. 130, Iss. 2
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