Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton
Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton
复制标题
测量 MAMI 的康普顿散射以提取质子的电和磁极化率
DOI：
10.1103/physrevlett.128.132503
复制
发表时间：
2022
影响因子：
8.6
通讯作者：
Bashkanov, M.
中科院分区：
文献类型：
--
作者：
Mornacchi, E.;Martel, P. P.;Abt, S.;Achenbach, P.;Adlarson, P.;Afzal, F.;Ahmed, Z.;Annand, J. R. M.;Arends, H. J.;Bashkanov, M.
在美因茨电子回旋加速器上，用标记光子束和准探测器精确测量了π介子阈值以下质子与康普顿散射的微分截面和线偏振光子束不对称性。入射光子是由最近升级的Albergow-Mainz光子标记设施产生的，并撞击在低温液氢靶上，散射光子在Crystal Ball/TAPS装置中被检测到。使用最高统计康普顿散射数据测量质子沿着与两个有效场理论（包括协变重子和重子）和一个固定的色散关系模型，约束与Baldin求和规则的拟合，我们得到了质子的电，磁极化率与前所未有的精度：，在单位，其中的误差是统计，系统，自旋极化率相关，和模型相关。
A precise measurement of the differential cross sectionsand the linearly polarized photon beam asymmetryfor Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almostdetector at the Mainz Microtron. The incident photons were produced by the recently upgraded Glasgow-Mainz photon tagging facility and impinged on a cryogenic liquid hydrogen target, with the scattered photons detected in the Crystal Ball/TAPS setup. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theories (both covariant baryon and heavy-baryon) and one fixed-dispersion relation model, constraining the fits with the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision:,; in units ofwhere the errors are statistical, systematic, spin polarizability dependent, and model dependent.