Observation of Correlations between Spin and Transverse Momenta in Back-to-Back Dihadron Production at CLAS12
Observation of Correlations between Spin and Transverse Momenta in Back-to-Back Dihadron Production at CLAS12
复制标题
CLAS12 背靠背双强子生产中自旋和横向动量之间相关性的观察
DOI：
10.1103/physrevlett.130.022501
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发表时间：
2023
影响因子：
8.6
通讯作者：
Bashkanov, M.
中科院分区：
文献类型：
--
作者：
Avakian, H.;Hayward, T. B.;Kotzinian, A.;Armstrong, W. R.;Atac, H.;Ayerbe Gayoso, C.;Baashen, L.;Baltzell, N. A.;Barion, L.;Bashkanov, M.
我们报告的第一次测量的深度非弹性散射自旋依赖的方位角不对称性在背靠背双强子电产生的深度非弹性散射过程。在这个反应中，两个强子产生在相对的半球沿着轴在虚光子-靶核子质心框架，与第一个强子产生在电流碎裂区和第二个在靶碎裂区。这些数据是用杰斐逊实验室的CLAS 12光谱仪用10.2和10.6 GeV的纵向极化电子束入射到非极化液氢靶上获得的。在事件中观察到的非零调制，即质子和π介子在虚光子和目标核子质心系中的方位角的差异，表明在目标和电流碎裂区产生的强子的自旋和横动量之间的相关性可能是显着的。测得的束自旋不对称性提供了一个以前未探索的领先扭转自旋和横向动量依赖的断裂功能的双强子生产的第一次访问。断裂函数描述了虚光子被靶粒子中的夸克硬散射后靶余核的强子化，为研究核子结构和强子化提供了新的途径。
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 theaxis 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 nonzeromodulations inevents, whereis 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.