Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process

We present measurements of the electron helicity asymmetry in quasi-elastic proton knockout from 2H and 12C nuclei by polarized electrons. This asymmetry depends on the fifth structure function, is antisymmetric with respect to the scattering plane, and vanishes in the absence of final-state interac...

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Autores principales:	T. Kolar, S.J. Paul, P. Achenbach, H. Arenhövel, A. Ashkenazi, J. Beričič, R. Böhm, D. Bosnar, T. Brecelj, E. Cline, E.O. Cohen, M.O. Distler, A. Esser, I. Friščić, R. Gilman, C. Giusti, M. Heilig, M. Hoek, D. Izraeli, S. Kegel, P. Klag, I. Korover, J. Lichtenstadt, I. Mardor, H. Merkel, D.G. Middleton, M. Mihovilovič, J. Müller, U. Müller, M. Olivenboim, E. Piasetzky, J. Pochodzalla, G. Ron, B.S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, S. Širca, R. Spreckels, S. Štajner, Y. Stöttinger, S. Strauch, M. Thiel, A. Tyukin, A. Weber, I. Yaron
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/ae9124aedbdb4a499a0434893378eb5b
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spelling	oai:doaj.org-article:ae9124aedbdb4a499a0434893378eb5b2021-12-02T04:59:02ZMeasurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process0370-269310.1016/j.physletb.2021.136798https://doaj.org/article/ae9124aedbdb4a499a0434893378eb5b2022-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321007383https://doaj.org/toc/0370-2693We present measurements of the electron helicity asymmetry in quasi-elastic proton knockout from 2H and 12C nuclei by polarized electrons. This asymmetry depends on the fifth structure function, is antisymmetric with respect to the scattering plane, and vanishes in the absence of final-state interactions, and thus it provides a sensitive tool for their study. Our kinematics cover the full range in off-coplanarity angle ϕpq, with a polar angle θpq coverage up to about 8°. The missing energy resolution enabled us to determine the asymmetries for knock-out resulting in different states of the residual 11B system. We find that the helicity asymmetry for p-shell knockout from 12C depends on the final state of the residual system and is relatively large (up to ≈0.16), especially at low missing momentum. It is considerably smaller (up to ≈0.01) for s-shell knockout from both 12C and 2H. The data for 2H are in very good agreement with theoretical calculations, while the predictions for 12C exhibit differences with respect to the data.T. KolarS.J. PaulP. AchenbachH. ArenhövelA. AshkenaziJ. BeričičR. BöhmD. BosnarT. BreceljE. ClineE.O. CohenM.O. DistlerA. EsserI. FriščićR. GilmanC. GiustiM. HeiligM. HoekD. IzraeliS. KegelP. KlagI. KoroverJ. LichtenstadtI. MardorH. MerkelD.G. MiddletonM. MihovilovičJ. MüllerU. MüllerM. OlivenboimE. PiasetzkyJ. PochodzallaG. RonB.S. SchlimmeM. SchothF. SchulzC. SfientiS. ŠircaR. SpreckelsS. ŠtajnerY. StöttingerS. StrauchM. ThielA. TyukinA. WeberI. YaronElsevierarticlePhysicsQC1-999ENPhysics Letters B, Vol 824, Iss , Pp 136798- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 T. Kolar S.J. Paul P. Achenbach H. Arenhövel A. Ashkenazi J. Beričič R. Böhm D. Bosnar T. Brecelj E. Cline E.O. Cohen M.O. Distler A. Esser I. Friščić R. Gilman C. Giusti M. Heilig M. Hoek D. Izraeli S. Kegel P. Klag I. Korover J. Lichtenstadt I. Mardor H. Merkel D.G. Middleton M. Mihovilovič J. Müller U. Müller M. Olivenboim E. Piasetzky J. Pochodzalla G. Ron B.S. Schlimme M. Schoth F. Schulz C. Sfienti S. Širca R. Spreckels S. Štajner Y. Stöttinger S. Strauch M. Thiel A. Tyukin A. Weber I. Yaron Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
description	We present measurements of the electron helicity asymmetry in quasi-elastic proton knockout from 2H and 12C nuclei by polarized electrons. This asymmetry depends on the fifth structure function, is antisymmetric with respect to the scattering plane, and vanishes in the absence of final-state interactions, and thus it provides a sensitive tool for their study. Our kinematics cover the full range in off-coplanarity angle ϕpq, with a polar angle θpq coverage up to about 8°. The missing energy resolution enabled us to determine the asymmetries for knock-out resulting in different states of the residual 11B system. We find that the helicity asymmetry for p-shell knockout from 12C depends on the final state of the residual system and is relatively large (up to ≈0.16), especially at low missing momentum. It is considerably smaller (up to ≈0.01) for s-shell knockout from both 12C and 2H. The data for 2H are in very good agreement with theoretical calculations, while the predictions for 12C exhibit differences with respect to the data.
format	article
author	T. Kolar S.J. Paul P. Achenbach H. Arenhövel A. Ashkenazi J. Beričič R. Böhm D. Bosnar T. Brecelj E. Cline E.O. Cohen M.O. Distler A. Esser I. Friščić R. Gilman C. Giusti M. Heilig M. Hoek D. Izraeli S. Kegel P. Klag I. Korover J. Lichtenstadt I. Mardor H. Merkel D.G. Middleton M. Mihovilovič J. Müller U. Müller M. Olivenboim E. Piasetzky J. Pochodzalla G. Ron B.S. Schlimme M. Schoth F. Schulz C. Sfienti S. Širca R. Spreckels S. Štajner Y. Stöttinger S. Strauch M. Thiel A. Tyukin A. Weber I. Yaron
author_facet	T. Kolar S.J. Paul P. Achenbach H. Arenhövel A. Ashkenazi J. Beričič R. Böhm D. Bosnar T. Brecelj E. Cline E.O. Cohen M.O. Distler A. Esser I. Friščić R. Gilman C. Giusti M. Heilig M. Hoek D. Izraeli S. Kegel P. Klag I. Korover J. Lichtenstadt I. Mardor H. Merkel D.G. Middleton M. Mihovilovič J. Müller U. Müller M. Olivenboim E. Piasetzky J. Pochodzalla G. Ron B.S. Schlimme M. Schoth F. Schulz C. Sfienti S. Širca R. Spreckels S. Štajner Y. Stöttinger S. Strauch M. Thiel A. Tyukin A. Weber I. Yaron
author_sort	T. Kolar
title	Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
title_short	Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
title_full	Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
title_fullStr	Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
title_full_unstemmed	Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process
title_sort	measurements of the electron-helicity asymmetry in the quasi-elastic a(e→,e′p) process
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/ae9124aedbdb4a499a0434893378eb5b
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Measurements of the electron-helicity asymmetry in the quasi-elastic A(e→,e′p) process

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