Authors | Vincent Sulkosky, Ge Jin, Elena Long, Yawei Zhang, Miha Mihovilovic, Aidan Kelleher, Bryon Anderson, Douglas Higinbotham, Simon Sirca, Kalyan Allada, John Annand, Todd Averett, William Bertozzi, Werner Boeglin, Peter Bradshaw, Alexandre Camsonne, Mustafa Canan, Gordon Cates, Chunhua Chen, Jian-Ping Chen, Eugene Chudakov, Raffaele De Leo, Xiaoyan Deng, Alexandre Deur, Chiranjib Dutta, Lamiaa El Fassi, David Flay, Salvatore Frullani, Franco Garibaldi, Haiyan Gao, Shalev Gilad, Ronald Gilman, Oleksandr Glamazdin, Serkan Golge, Javier Gomez, Jens-Ole Hansen, Timothy Holmstrom, J. Huang, Hassan Abdalla, Cornelis De Jager, E. Jensen, Xiaodong Jiang, Mark Jones, Hoyoung Kang, Joseph Katich, Hari Khanal, Paul King, Wolfgang Korsch, John LeRose, Richard Lindgren, Hai-jiang Lu, Wei Luo, Pete Markowitz, David Meekins, Mehdi Meziane, Robert Michaels, Bryan Moffit, Peter Monaghan, Navaphon Muangma, Sirish Nanda, Blaine Norum, Kai Pan, Diana Parno, Eliazer Piasetzky, Matthew Posik, Vina Punjabi, Andrew Puckett, Xin Qian, Yi Qiang, X. Qui, Seamus Riordan, Sahap Aybat, Bradley Sawatzky, Mitra Hashemi Shabestari, Albert Shahinyan, B. Shoenrock, Jeremy St. John, Ramesh Subedi, William Tobias, William Tireman, Guido Maria Urciuoli, Diancheng Wang, Kebin Wang, Y. Wang, John Watson, Bogdan Wojtsekhowski, Z. Ye, Xiaohui Zhan, Yi Zhang, Xiaochao Zheng, Bo Zhao, Lingyan Zhu |
Publication Abstract: | [Background] Measurements of the neutron charge distribution are made difficult by the fact that, with no net charge, the neutron electric form factor, GEN, is generally much smaller than the magnetic form factor, GMN. In addition, measurements of these form factors must use nuclear targets which require accurately accounting for nuclear effects. This makes extracting GEN with different targets and techniques an important test of our handling of the nuclear effects. [Purpose] The goal of the measurements reported here was to demonstrate that for momentum transfers near 1 [GeV/c]^2 inclusive scattering can be used as an efficient and effective method of extracting GEN with very different systematics than traditional exclusive measurements. [Method] The inclusive quasi-elastic polarized 3He(e,e') reaction was measured at Jefferson Lab. The neutron electric form factor,GEN, was extracted at Q^2 = 0.98 [GeV/c]^2 from ratios of electron-polarization asymmetries measured for two orthogonal target spin orientations. This Q^2 is high enough that the sensitivity to GEN is not overwhelmed
by the neutron magnetic contribution, and yet low enough that explicit neutron detection is not required to suppress pion production. [Results] The neutron electric form factor, GEN, was determined to be 0.0414 +/- 0.0077 stat. +/- 0.0022 syst. This result is consistent with other measurements near this value of Q^2. Due to the short 2.5-day running time for this proof of principle measurement, the precision is limited simply by statistics.
[Conclusions] The use of the inclusive quasi-elastic polarized 3He(e,e') for four momentum transfers near 1 [GeV/c]^2 has been shown to yield results with accuracy and precision comparable to those obtainable using exclusive reaction channel. While the method has a rather limit range of kinematic applicability, it does provide an important validation of the exclusive channel extractions. |