Measurement of the generalized polarizabilities of the proton at intermediate Q2
Measurement of the generalized polarizabilities of the proton at intermediate
Q2
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中间 Q2 处质子广义极化率的测量
DOI：
10.1103/physrevc.103.025205
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发表时间：
2021
影响因子：
3.1
通讯作者：
M. Weinriefer
中科院分区：
文献类型：
--
作者：
H. Fonvieille;J. Beričič;L. Correa;M. Benali;P. Achenbach;C. Ayerbe Gayoso;J. Bernauer;A. Blomberg;R. Böhm;D. Bosnar;L. Debenjak;A. Denig;M. Distler;E. Downie;A. Esser;I. Friščić;S. Kegel;Y. Kohl;M. Makek;H. Merkel;D. Middleton;M. Mihovilovič;U. Müller;L. Nungesser;M. Paolone;J. Pochodzalla;S. Sánchez Majos;B. Schlimme;M. Schoth;F. Schulz;C. Sfienti;S. Širca;N. Sparveris;S. Štajner;M. Thiel;A. Tyukin;A. Weber;M. Weinriefer
背景：广义极化率(GP)是描述核子结构的重要可观测参数，目前对这些可观测参数的测量仍然很少。目的：通过对EP→EPγ反应的研究，给出了在美因茨微加速器A1装置上进行的虚拟康普顿散射实验的细节。本文侧重于分析的精选方面。方法：在四动量转移平方Q2的三个新数值：0.10、0.20和0.45GeV2下，提取了质子的PLL、−、PTT/e和PLT结构函数，以及质子的电磁GP。结果：强调了实验参数校准的重要性。给出了测量的EP-→-EP-γ截面特性，并与理论进行了比较。对极化率拟合的详细研究揭示了它们的部分复杂性，这与低能量展开的高阶项有关。结论：这些因素有助于减少系统不确定度，提高物理结果的精确度。
Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce. Purpose: This paper presents details of a virtual Compton scattering (VCS) experiment, performed at the A1 setup at the Mainz Microtron by studying the ep→epγ reaction. The article focuses on selected aspects of the analysis. Method: The experiment extracted the PLL−PTT/e and PLT structure functions, as well as the electric and magnetic GPs of the proton, at three new values of the four-momentum transfer squared Q2: 0.10, 0.20, and 0.45GeV2. Results: We emphasize the importance of the calibration of experimental parameters. The behavior of the measured ep→epγ cross section is presented and compared to the theory. A detailed investigation of the polarizability fits reveals part of their complexity, in connection with the higher-order terms of the low-energy expansion. Conclusions: The presented aspects are elements which contribute to minimize the systematic uncertainties and improve the precision of the physics results.
影响因子：
5
作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli
通讯作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli