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Adhikari, D; Albataineh, H; Androic, D; Aniol, K; Armstrong, D S; Ayerbe Gayoso, C; Barcus, S; Bellini, V; Beminiwattha, R S; Benesch, J F; Bhatt, H; Bhatta Pathak, D; Bhetuwal, D; Blaikie, B; Boyd, J; Campagna, Q; Camsonne, A; Cates, G D; Chen, Y; Clarke, C; Cornejo, J C; Covrig Dusa, S; Dalton, M M; Datta, P; Deshpande, A; Dutta, D; Feldman, C; Fuchey, E; Gal, C; Gaskell, D; Gautam, T; Gericke, M; Ghosh, C; Halilovic, I; Hauenstein, F; Henry, W; Horowitz, C J; Jantzi, C; Jian, S; Johnston, S; Jones, D C; Karki, B; Kakkar, S; Katugampola, S; Keppel, C E; King, P M; King, D E; Knauss, M; Kumar, K S; Kutz, T; Lashley-Colthirst, N; Leverick, G; Liu, H; Liyange, N; Malace, S; Mammei, J; Mammei, R; McCaughan, M; McNulty, D; Meekins, D; Metts, C; Michaels, R; Mihovilovic, M; Mondal, M M; Napolitano, J; Nikolaev, D; Rashad, M N H; Owen, V; Palatchi, C; Pan, J; Pandey, B; Park, S; Paschke, K D; Petrusky, M; Premathilake, S; Puckett, A J R; Quinn, B; Radloff, R; Rahman, S; Rathnayake, A; Reed, B T; Reimer, P E; Richards, R; Roblin, Y; Seeds, S; Shahinyan, A; Souder, P A; Tang, L; Thiel, M; Tian, Y; Urciuoli, G M; Wertz, E W; Wojtsekhowski, B; Xiong, W; Yale, B; Ye, T; Zec, A; Zhang, W; Zhang, J; Zheng, X
Physical review letters, 04/2022, Volume: 128, Issue: 14Journal Article
We report precision determinations of the beam-normal single spin asymmetries (A_{n}) in the elastic scattering of 0.95 and 2.18 GeV electrons off ^{12}C, ^{40}Ca, ^{48}Ca, and ^{208}Pb at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of A_{n} for ^{40}Ca and ^{48}Ca are found to be similar to that of ^{12}C, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report A_{n} for ^{208}Pb at two new momentum transfers (Q^{2}) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the Z≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern A_{n} for nuclei containing ≲50 nucleons, but point to the need for further investigation to understand the unusual A_{n} behavior discovered for scattering off ^{208}Pb.
