Proton form factor ratio μpGEp/GMp from double spin asymmetry
Proton form factor ratio μpGEp/GMp from double spin asymmetry
复制标题
双自旋不对称性的质子形状因数比μpGEp/GMp
DOI：
10.1103/physrevc.101.035206
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发表时间：
2020
影响因子：
3.1
通讯作者：
Ates, O.
中科院分区：
文献类型：
--
作者：
Liyanage, A.;Armstrong, W.;Kang, H.;Maxwell, J.;Mulholland, J.;Ndukum, L.;Ahmidouch, A.;Albayrak, I.;Asaturyan, A.;Ates, O.
利用双自旋不对称性，测量了极化电子束与四个动量转移平方的靶的弹性电子-质子散射中质子的电磁形状因子之比。这种测量与先前反冲极化数据的依赖性一致，并再次证实了Rosenbluth和极化转移方法之间的差异，该方法具有不同的测量技术和与反冲极化测量无关的系统不确定性。测得的形状因子比为μpGEp/GMp=0.720±0.176stat±0.039sys，这与以前在类似运动学条件下用极化靶技术测得的结果一致。形状因子比为μpGEp/GMp=0.244±0.353stat±0.013sys，这是迄今为止利用极化靶的双自旋不对称性所达到的最高测量值。
The ratio of the electric to magnetic form factors of the proton,, has been measured for elastic electron-proton scattering with polarized beam and target up to four-momentum transfer squaredusing double spin asymmetry for target spin orientation aligned nearly perpendicular to the beam momentum direction. This measurement ofagrees with thedependence of previous recoil polarization data and reconfirms the discrepancy at highbetween the Rosenbluth and the polarization-transfer method with a different measurement technique and systematic uncertainties uncorrelated to those of the recoil-polarization measurements. The form factor ratio athas been measured as μpGEp/GMp=0.720±0.176stat±0.039sys, which is in agreement with an earlier measurement using the polarized target technique at similar kinematics. The form factor ratio athas been determined as μpGEp/GMp=0.244±0.353stat±0.013sys, which represents the highestmeasurement reached using double spin asymmetries with polarized target to date.