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Search for Effects Beyond the Born Approximation in Polarization Transfer Observables in ep Elastic Scattering.

机译:在ep弹性散射中寻找超出极化近似中的玻恩近似的影响。

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摘要

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, GE/GM, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange (TPEX) contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, this thesis reports measurements, of the GEp2gamma experiment, of polarization transfer observables in the elastic H ( e&ar;,e' p&ar; ) reaction for three different beam energies at a fixed squared momentum transfer Q² = 2.5 GeV², spanning a wide range of the virtual photon polarization parameter, epsilon. The scattered electrons were detected in coincidence with the protons by the new electromagnetic lead-glass calorimeter BigCal and the High Momentum Spectrometer (HMS), respectively. We extract the polarization of the recoil proton by measuring the azymuthal asymmetry in the angular distribution after a secondary scattering in the CH2 analyzer blocks of the new, double focal plane polarimeter (FPP) installed in the detector hut of the HMS.
机译:在过去的十年中,大量的理论和实验努力旨在解释质子电与磁形状因子之比GE / GM的数据之间的差异,该数据是分别从横截面和极化转移测量中获得的。造成这种差异的一种可能解释是两光子交换(TPEX)。为了寻找除单光子交换或Born近似之外的效应,本论文报告了GEp2γ实验对三种不同光束在弹性H(e&ar;,e'p&ar;)反应中可观察到的偏振转移的测量结果。固定平方动量传递Q²= 2.5GeV²时的能量,涵盖了很大范围的虚拟光子极化参数epsilon。新型电磁铅玻璃量热仪BigCal和高动量谱仪(HMS)分别检测了与质子一致的散射电子。我们通过测量安装在HMS探测器外壳中的新型双焦平面旋光计(FPP)的CH2分析仪块中的二次散射后,通过测量角度分布中的相互不对称性来提取后坐质子的极化。

著录项

  • 作者

    Meziane, Mehdi.;

  • 作者单位

    The College of William and Mary.;

  • 授予单位 The College of William and Mary.;
  • 学科 Physics Nuclear.;Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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