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

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arxiv 1309.5297 v1 pith:FSKS4HPF submitted 2013-09-20 nucl-ex hep-ex

JLab Measurement of the ⁴He 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
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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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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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Cited by 3 Pith papers

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