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arXiv · 1409.2253

Measurement of double-polarization asymmetries in the quasi-elastic $^3\vec{\mathrm{He}}(\vec{\mathrm{e}},\mathrm{e}'\mathrm{d})$ process

The Jefferson Lab Hall A Collaboration·M. Mihovilovič·G. Jin·E. Long·Y. -W. Zhang·K. Allada·B. Anderson·J. R. M. Annand·T. Averett·W. Boeglin·P. Bradshaw·A. Camsonne·M. Canan·G. D. Cates·C. Chen·J. P. Chen·E. Chudakov·R. De Leo·X. Deng·A. Deltuva·A. Deur·C. Dutta·L. El Fassi·D. Flay·S. Frullani·F. Garibaldi·H. Gao·S. Gilad·R. Gilman·O. Glamazdin·J. Golak·S. Golge·J. Gomez·O. Hansen·D. W. Higinbotham·T. Holmstrom·J. Huang·H. Ibrahim·C. W. de Jager·E. Jensen·X. Jiang·M. Jones·H. Kang·J. Katich·H. P. Khanal·A. Kievsky·P. King·W. Korsch·J. LeRose·R. Lindgren·H. -J. Lu·W. Luo·L. E. Marcucci·P. Markowitz·M. Meziane·R. Michaels·B. Moffit·P. Monaghan·N. Muangma·S. Nanda·B. E. Norum·K. Pan·D. Parno·E. Piasetzky·M. Posik·V. Punjabi·A. J. R. Puckett·X. Qian·Y. Qiang·X. Qui·S. Riordan·A. Saha·P. U. Sauer·B. Sawatzky·R. Schiavilla·M. Shabestari·A. Shahinyan·B. Schoenrock·S. Širca·R. Skibiński·J. St. John·R. Subedi·V. Sulkosky·W. A. Tobias·W. Tireman·G. M. Urciuoli·M. Viviani·D. Wang·K. Wang·Y. Wang·J. Watson·B. Wojtsekhowski·H. Witała·Z. Ye·X. Zhan·Y. Zhang·X. Zheng·B. Zhao·L. Zhu
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Abstract

We present a precise measurement of double-polarization asymmetries in the $^3\vec{\mathrm{He}}(\vec{\mathrm{e}},\mathrm{e}'\mathrm{d})$ reaction. This particular process is a uniquely sensitive probe of hadron dynamics in $^3\mathrm{He}$ and the structure of the underlying electromagnetic currents. The measurements have been performed in and around quasi-elastic kinematics at $Q^2 = 0.25\,(\mathrm{GeV}/c)^2$ for missing momenta up to $270\,\mathrm{MeV}/c$. The asymmetries are in fair agreement with the state-of-the-art calculations in terms of their functional dependencies on $p_\mathrm{m}$ and $ω$, but are systematically offset. Beyond the region of the quasi-elastic peak, the discrepancies become even more pronounced. Thus, our measurements have been able to reveal deficiencies in the most sophisticated calculations of the three-body nuclear system, and indicate that further refinement in the treatment of their two- and/or three-body dynamics is required.

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The Jefferson Lab Hall A Collaboration, M. Mihovilovič, G. Jin, E. Long, Y. -W. Zhang, K. Allada, B. Anderson, J. R. M. Annand, T. Averett, W. Boeglin, P. Bradshaw, A. Camsonne, M. Canan, G. D. Cates, C. Chen, J. P. Chen, E. Chudakov, R. De Leo, X. Deng, A. Deltuva, A. Deur, C. Dutta, L. El Fassi, D. Flay, S. Frullani, F. Garibaldi, H. Gao, S. Gilad, R. Gilman, O. Glamazdin, J. Golak, S. Golge, J. Gomez, O. Hansen, D. W. Higinbotham, T. Holmstrom, J. Huang, H. Ibrahim, C. W. de Jager, E. Jensen, X. Jiang, M. Jones, H. Kang, J. Katich, H. P. Khanal, A. Kievsky, P. King, W. Korsch, J. LeRose, R. Lindgren, H. -J. Lu, W. Luo, L. E. Marcucci, P. Markowitz, M. Meziane, R. Michaels, B. Moffit, P. Monaghan, N. Muangma, S. Nanda, B. E. Norum, K. Pan, D. Parno, E. Piasetzky, M. Posik, V. Punjabi, A. J. R. Puckett, X. Qian, Y. Qiang, X. Qui, S. Riordan, A. Saha, P. U. Sauer, B. Sawatzky, R. Schiavilla, M. Shabestari, A. Shahinyan, B. Schoenrock, S. Širca, R. Skibiński, J. St. John, R. Subedi, V. Sulkosky, W. A. Tobias, W. Tireman, G. M. Urciuoli, M. Viviani, D. Wang, K. Wang, Y. Wang, J. Watson, B. Wojtsekhowski, H. Witała, Z. Ye, X. Zhan, Y. Zhang, X. Zheng, B. Zhao, L. Zhu. 2014-10-23. Measurement of double-polarization asymmetries in the quasi-elastic $^3\vec{\mathrm{He}}(\vec{\mathrm{e}},\mathrm{e}'\mathrm{d})$ process. https://doi.org/10.1103/physrevlett.113.232505

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