arXiv 0809.31612008-09-18nucl-ex

带电π介子形状因子在$Q^2$ =0.60和2.45 GeV $^2$之间。I. ${^1}$ H（$e,e'π^+$）$n$反应截面的测量

Charged pion form factor between $Q^2$=0.60 and 2.45 GeV$^2$. I. Measurements of the cross section for the ${^1}$H($e,e'π^+$)$n$ reaction

H. P. Blok, T. Horn, G. M. Huber, E. J. Beise, D. Gaskell, D. J. Mack, V. Tadevosyan, J. Volmer, D. Abbott, K. Aniol, H. Anklin, C. Armstrong, J. Arrington, K. … 展开作者

H. P. Blok, T. Horn, G. M. Huber, E. J. Beise, D. Gaskell, D. J. Mack, V. Tadevosyan, J. Volmer, D. Abbott, K. Aniol, H. Anklin, C. Armstrong, J. Arrington, K. Assamagan, S. Avery, O. K. Baker, B. Barrett, C. Bochna, W. Boeglin, E. J. Brash, H. Breuer, C. C. Chang, N. Chant, M. E. Christy, J. Dunne, T. Eden, R. Ent, H. Fenker, E. Gibson, R. Gilman, K. Gustafsson, W. Hinton, R. J. Holt, H. Jackson, S. Jin, M. K. Jones, C. E. Keppel, P. H. Kim, W. Kim, P. M. King, A. Klein, D. Koltenuk, V. Kovaltchouk, M. Liang, J. Liu, G. J. Lolos, A. Lung, D. J. Margaziotis, P. Markowitz, A. Matsumura, D. McKee, D. Meekins, J. Mitchell, T. Miyoshi, H. Mkrtchyan, B. Mueller, G. Niculescu, I. Niculescu, Y. Okayasu, L. Pentchev, C. Perdrisat, D. Pitz, D. Potterveld, V. Punjabi, L. M. Qin, P. Reimer, J. Reinhold, J. Roche, P. G. Roos, A. Sarty, I. K. Shin, G. R. Smith, S. Stepanyan, L. G. Tang, V. Tvaskis, R. L. J. van der Meer, K. Vansyoc, D. Van Westrum, S. Vidakovic, W. Vulcan, G. Warren, S. A. Wood, C. Xu, C. Yan, W. -X. Zhao, X. Zheng, B. Zihlmann

备注：: 26 pages, 23 figures
发表信息：: Phys.Rev.C78:045202,2008
DOI：: 10.1103/PhysRevC.78.045202

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摘要：

在托马斯·杰斐逊国家加速器设施（JLab）的C厅使用CEBAF高强度连续电子束测量反应${^1}$ H（$e,e'π^+$）$n$的横截面，以确定带电π形状因子。中心四动量转移范围从$Q^2$ =0.60至2.45 GeV $^2$的数据，在不变质量的虚光子-核子系统的$W$ =1.95和2.22 GeV。将测量的横截面分成四个结构函数$σ_L$、$σ_T$、$σ_{LT}$和$σ_{TT}$。详细描述了实验装置和分析步骤的各个部分，包括校准和系统研究，这是获得高精度结果所需的。不同类型的系统不确定性进行了讨论。的结果作为一个函数的Mandelivery变量$t$在不同的$Q^2$值的分离截面。讨论了数据的某些全局特征，并将数据与反应${^1}$ H（$e,e'π^+$）$n$的某些模型计算结果进行了比较.

英文摘要：

Cross sections for the reaction ${^1}$H($e,e'π^+$)$n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF high-intensity, continous electron beam in order to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from $Q^2$=0.60 to 2.45 GeV$^2$ at an invariant mass of the virtual photon-nucleon system of $W$=1.95 and 2.22 GeV. The measured cross sections were separated into the four structure functions $σ_L$, $σ_T$, $σ_{LT}$, and $σ_{TT}$. The various parts of the experimental setup and the analysis steps are described in detail, including the calibrations and systematic studies, which were needed to obtain high precision results. The different types of systematic uncertainties are also discussed. The results for the separated cross sections as a function of the Mandelstam variable $t$ at the different values of $Q^2$ are presented. Some global features of the data are discussed, and the data are compared with the results of some model calculations for the reaction ${^1}$H($e,e'π^+$)$n$.

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