The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic e→p and quasi-elastic e→A scattering-猫眼课题宝

DOI：

10.1016/j.physletb.2019.04.004

发表时间：

2019-01

期刊：

Physics Letters B

影响因子：

4.4

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

S. Paul;T. Brecelj;H. Arenhövel;P. Achenbach;A. Ashkenazi;J. Beričič;R. Böhm;D. Bosnar;E. Cohen;L. Debenjak;M. Distler;A. Esser;I. Friščić;R. Gilman;D. Izraeli;T. Kolar;I. Korover;J. Lichtenstadt;I. Mardor;H. Merkel;D. Middleton;M. Mihovilovič;M. Mihovilovič;U. Müller;M. Olivenboim;E. Piasetzky;J. Pochodzalla;G. Ron;B. Schlimme;M. Schoth;F. Schulz;C. Sfienti;S. Širca;S. Štajner;S. Strauch;M. Thiel;A. Tyukin;A. Weber;I. Yaron

比较A（e→，e′ p→）敲除反应准自由运动学中束缚质子的极化转移与自由质子弹性散射的极化转移，可以提供束缚质子特性的信息.在过去的测量报告已被比较的自由质子与零初始动量。我们介绍，为第一次，表达式的极化转移组件时，质子最初是在运动中，并将它们与2 H的数据在美因茨微波（MAMI）测量。我们给出了H2（e→，e′ p→）n中极化转移的横向分量（Px）和纵向分量（Pz）与“运动质子”弹性散射分量的比值，假设质子的初始（费米运动）动量等于测量反应中的负丢失动量.我们发现，由于质子运动的修正是高达20%，在高丢失的动量。然而，对双比（Px/Pz）A（Px/Pz）H1的影响在很大程度上被抵消，如2 H和12 C数据所示。这意味着静止质子和运动质子运动学之间的差异不是先前报道的准弹性散射和弹性散射之间偏差的主要原因。

A comparison between polarization-transfer to a bound proton in quasi-free kinematics by the A (e→, e′ p→) knockout reaction and that in elastic scattering off a free proton can provide information on the characteristics of the bound proton. In the past the reported measurements have been compared to those of a free proton with zero initial momentum. We introduce, for the first time, expressions for the polarization-transfer components when the proton is initially in motion and compare them to the 2 H data measured at the Mainz Microtron (MAMI). We show the ratios of the transverse (P x) and longitudinal (P z) components of the polarization transfer in H 2 (e→, e′ p→) n, to those of elastic scattering off a “moving proton”, assuming the proton's initial (Fermi-motion) momentum equals the negative missing momentum in the measured reaction. We found that the correction due to the proton motion is up to 20% at high missing momentum. However the effect on the double ratio (P x/P z) A (P x/P z) H 1 is largely canceled out, as shown for both 2 H and 12 C data. This implies that the difference between the resting-and the moving-proton kinematics is not the primary cause for the deviations between quasi-elastic and elastic scattering reported previously.

The influence of Fermi motion on the comparison of the polarization transfer to a proton in elastic e→p and quasi-elastic e→A scattering

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