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arXiv · 2103.09758

Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from $^{12}$C and $^{27}$Al

QWeak Collaboration·D. Androic·D. S. Armstrong·A. Asaturyan·K. Bartlett·R. S. Beminiwattha·J. Benesch·F. Benmokhtar·J. Birchall·R. D. Carlini·M. E. Christy·J. C. Cornejo·S. Covrig Dusa·M. M. Dalton·C. A. Davis·W. Deconinck·J. F. Dowd·J. A. Dunne·D. Dutta·W. S. Duvall·M. Elassar·W. R. Falk·J. M. Finn·T. Forest·C. Gal·D. Gaskell·M. T. W. Gericke·V. M. Gray·F. Guo·J. R. Hoskins·D. C. Jones·M. Kargiantoulakis·P. M. King·E. Korkmaz·S. Kowalski·J. Leacock·J. P. Leckey·A. R. Lee·J. H. Lee·L. Lee·S. MacEwan·D. Mack·J. A. Magee·R. Mahurin·J. Mammei·J. W. Martin·M. J. McHugh·D. Meekins·K. E. Mesick·R. Michaels·A. Mkrtchyan·H. Mkrtchyan·A. Narayan·L. Z. Ndukum·Nuruzzaman·V. Nelyubin·W. T. H van Oers·V. F. Owen·S. A. Page·J. Pan·K. D. Paschke·S. K. Phillips·M. L. Pitt·R. W. Radloff·J. F. Rajotte·W. D. Ramsay·J. Roche·B. Sawatzky·T. Seva·M. H. Shabestari·R. Silwal·N. Simicevic·G. R. Smith·P. Solvignon·D. T. Spayde·A. Subedi·R. Subedi·V. Tadevosyan·W. A. Tobias·B. Waidyawansa·P. Wang·S. P. Wells·S. A. Wood·P. Zang·S. Zhamkochyan
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Abstract

We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries $B_n$ on $^{12}$C and $^{27}$Al, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to a series of previous measurements of $B_n$ on $^{12}$C and provide a first measurement on $^{27}$Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7 degrees, and the average $Q^2$ for both targets was 0.02437 GeV$^2$ (Q=0.1561 GeV). The asymmetries are $B_n$ = -10.68 $\pm$ 0.90 stat) $\pm$ 0.57 (syst) ppm for $^{12}$C and $B_n$ = -12.16 $\pm$ 0.58 (stat) $\pm$ 0.62 (syst) ppm for $^{27}$Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q-dependence of all the far-forward angle (theta < 10 degrees) data from $^{1}$H to $^{27}$Al can be described by the same slope out to $Q \approx 0.35$ GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep.

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QWeak Collaboration, D. Androic, D. S. Armstrong, A. Asaturyan, K. Bartlett, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carlini, M. E. Christy, J. C. Cornejo, S. Covrig Dusa, M. M. Dalton, C. A. Davis, W. Deconinck, J. F. Dowd, J. A. Dunne, D. Dutta, W. S. Duvall, M. Elassar, W. R. Falk, J. M. Finn, T. Forest, C. Gal, D. Gaskell, M. T. W. Gericke, V. M. Gray, F. Guo, J. R. Hoskins, D. C. Jones, M. Kargiantoulakis, P. M. King, E. Korkmaz, S. Kowalski, J. Leacock, J. P. Leckey, A. R. Lee, J. H. Lee, L. Lee, S. MacEwan, D. Mack, J. A. Magee, R. Mahurin, J. Mammei, J. W. Martin, M. J. McHugh, D. Meekins, K. E. Mesick, R. Michaels, A. Mkrtchyan, H. Mkrtchyan, A. Narayan, L. Z. Ndukum, Nuruzzaman, V. Nelyubin, W. T. H van Oers, V. F. Owen, S. A. Page, J. Pan, K. D. Paschke, S. K. Phillips, M. L. Pitt, R. W. Radloff, J. F. Rajotte, W. D. Ramsay, J. Roche, B. Sawatzky, T. Seva, M. H. Shabestari, R. Silwal, N. Simicevic, G. R. Smith, P. Solvignon, D. T. Spayde, A. Subedi, R. Subedi, V. Tadevosyan, W. A. Tobias, B. Waidyawansa, P. Wang, S. P. Wells, S. A. Wood, P. Zang, S. Zhamkochyan. 2021-03-17. Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from $^{12}$C and $^{27}$Al. https://doi.org/10.1103/physrevc.104.014606

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