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arXiv · 1309.5297

JLab Measurement of the $^4$He Charge Form Factor at Large Momentum Transfers

A. Camsonne·A. T. Katramatou·M. Olson·N. Sparveris·A. Acha·K. Allada·B. D. Anderson·J. Arrington·A. Baldwin·J. -P. Chen·S. Choi·E. Chudakov·E. Cisbani·B. Craver·P. Decowski·C. Dutta·E. Folts·S. Frullani·F. Garibaldi·R. Gilman·J. Gomez·B. Hahn·J. -O. Hansen·D. Higinbotham·T. Holmstrom·J. Huang·M. Iodice·X. Jiang·A. Kelleher·E. Khrosinkova·A. Kievsky·E. Kuchina·G. Kumbartzki·B. Lee·J. J. LeRose·R. A. Lindgren·G. Lott·H. Lu·L. E. Marcucci·D. J. Margaziotis·P. Markowitz·S. Marrone·D. Meekins·Z. -E. Meziani·R. Michaels·B. Moffit·B. Norum·G. G. Petratos·A. Puckett·X. Qian·O. Rondon·A. Saha·B. Sawatzky·J. Segal·M. Shabestari·A. Shahinyan·P. Solvignon·R. R. Subedi·R. Suleiman·V. Sulkosky·G. M. Urciuoli·M. Viviani·Y. Wang·B. B. Wojtsekhowski·X. Yan·H. Yao·W. -M. Zhang·X. Zheng·L. Zhu
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Abstract

The charge form factor of $^$4He has been extracted in the range 29 fm$^{-2}$ $\le Q^2 \le 77$ fm$^{-2}$ from elastic electron scattering, detecting $^4$He nuclei and electrons in coincidence with the High Resolution Spectrometers of the Hall A Facility of Jefferson Lab. The results are in qualitative agreement with realistic meson-nucleon theoretical calculations. The data have uncovered a second diffraction minimum, which was predicted in the $Q^2$ range of this experiment, and rule out conclusively long-standing predictions of dimensional scaling of high-energy amplitudes using quark counting.

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A. Camsonne, A. T. Katramatou, M. Olson, N. Sparveris, A. Acha, K. Allada, B. D. Anderson, J. Arrington, A. Baldwin, J. -P. Chen, S. Choi, E. Chudakov, E. Cisbani, B. Craver, P. Decowski, C. Dutta, E. Folts, S. Frullani, F. Garibaldi, R. Gilman, J. Gomez, B. Hahn, J. -O. Hansen, D. Higinbotham, T. Holmstrom, J. Huang, M. Iodice, X. Jiang, A. Kelleher, E. Khrosinkova, A. Kievsky, E. Kuchina, G. Kumbartzki, B. Lee, J. J. LeRose, R. A. Lindgren, G. Lott, H. Lu, L. E. Marcucci, D. J. Margaziotis, P. Markowitz, S. Marrone, D. Meekins, Z. -E. Meziani, R. Michaels, B. Moffit, B. Norum, G. G. Petratos, A. Puckett, X. Qian, O. Rondon, A. Saha, B. Sawatzky, J. Segal, M. Shabestari, A. Shahinyan, P. Solvignon, R. R. Subedi, R. Suleiman, V. Sulkosky, G. M. Urciuoli, M. Viviani, Y. Wang, B. B. Wojtsekhowski, X. Yan, H. Yao, W. -M. Zhang, X. Zheng, L. Zhu. 2013-09-20. JLab Measurement of the $^4$He Charge Form Factor at Large Momentum Transfers. https://doi.org/10.1103/physrevlett.112.132503

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