Beam-normal single spin asymmetry in elastic electron scattering off 28Si and 90Zr

Esser, A.; Thiel, M.; Achenbach, P.; Aulenbacher, K.; Aulenbacher, S.; Baunack, S.; Bosnar, D.; Caiazza, S. S.; Christmann, M.; Dehn, M.; Distler, M. O.; Doria, L.; Eckert, P.; Gülker, P.; Herrmann, P.; Hoek, M.; Kegel, S.; Klag, P.; Kreidel, H. J.; Littich, M.; Lunkenheimer, S.; Maas, F. E.; Makek, M.; Merkel, H.; Mihovilovič, M.; Müller, J.; Müller, U.; Pochodzalla, J.; Schlimme, B. S.; Spreckels, R.; Tioukine, V.; Sfienti, C.

doi:10.1016/j.physletb.2020.135664

Cited by 8 publications

(19 citation statements)

References 29 publications

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“…These estimated B i are tabulated in Table II. In the case of 28 Si, the A1 collaboration at Mainz has reported a result for B n [35], albeit at different kinematics than for the present measurement. Their B n agreed with the predictions for this nucleus using the model of Gorchtein and Horowitz to within about 30%.…”

Section: Corrections To a Exp : Backgroundscontrasting

confidence: 64%

“…5 (for 12 C). No other data exist for 27 Al, however data on a neighboring nucleus ( 28 Si) have recently been published [35] at E = 0.570 GeV near 20…”

Section: A Comparison To Calculationsmentioning

confidence: 99%

“…The model also has the feature that at fixed Q 2 , B n is almost independent of the beam energy [14,37]. With one exception, the Gorchtein and Horowitz model was found to work quite well describing the available data [33][34][35], if one assumes an uncertainty in the Compton slope parameter B c of ±20%. The exception is 208 Pb, where, at the experimental kinematics, the model predicts B n ≈ −8 ppm while the measurement [33] yielded B n = 0.28 ± 0.25 ppm.…”

Section: Introductionmentioning

confidence: 99%

“…• ), over a range of Q 2 (0.023 -0.049 GeV 2 ) [34]. The same collaboration has also reported measurements for 28 Si and 90 Zr at the same beam energy, at Q 2 ≈ 0.04 GeV 2 [35]. On the theoretical side, only two approaches have been applied.…”

Section: Introductionmentioning

confidence: 99%

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

Androic,

Armstrong,

Asaturyan

et al. 2021

Preprint

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Section: Corrections To a Exp : Backgroundscontrasting

confidence: 64%

“…5 (for 12 C). No other data exist for 27 Al, however data on a neighboring nucleus ( 28 Si) have recently been published [35] at E = 0.570 GeV near 20…”

Section: A Comparison To Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Androic,

Armstrong,

Asaturyan

et al. 2021

Preprint

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“…Multiple collaborations have reported SSA measurements from nuclei, which arise from the imaginary part of the TPE amplitude. These measurements include 4 He, 12 C, 40 Ca, 48 Ca, and 208 Pb by the PREX/CREX collaborations [9,10], 28 Si and 90 Zr by the A1 collaboration [11], and 12 C and 27 Al by the Qweak collaboration [12]. Theoretical calculations to compare with these data must address two phenomena.…”

Section: Tpe With Nucleimentioning

confidence: 99%

Two photon exchange with nuclei from $$e^+/e^-$$ elastic cross section ratios

Kutz

Schmidt

2022

Eur. Phys. J. A

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Hadronic box diagrams pose a significant source of radiative corrections to lepton scattering and $$\beta $$ β -decay measurements, yet their calculation remains highly model-dependent. Two-photon exchange is a box diagram generally relevant to most lepton scattering experiments, and is directly detectable via multiple observables. Single-spin asymmetries (SSA) are sensitive to the imaginary part of the TPE amplitude, while the ratio of $$e^+/e^-$$ e + / e - elastic scattering cross sections is sensitive to the real part of the TPE amplitude. While SSA measurements have been reported for several complex nuclei, measurements of the $$e^+/e^-$$ e + / e - ratio exist only for the proton. Proposed here is a measurement of the $$e^+/e^-$$ e + / e - ratio on $$^4$$ 4 He, a feasible nuclear target for which the ratio’s deviation from unity due to TPE is expected to be on order of 1–2%. Choosing a low Z nucleus minimizes Coulomb distortions, which could greatly overwhelm TPE for heavier nuclei. The proposed 19-day program, including measurements at three kinematic settings between $$0.3< Q^2 < 0.4$$ 0.3 < Q 2 < 0.4 GeV$$^2$$ 2 , would be made possible by the addition of a positron source at Jefferson Lab.

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