New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

D Adhikari¹, H Albataineh², D Androic³, K Aniol⁴, D S Armstrong⁵, T Averett⁵, C Ayerbe Gayoso⁵, S Barcus⁶, V Bellini⁷, R S Beminiwattha⁸, J F Benesch⁶, H Bhatt⁹, D Bhatta Pathak⁸, D Bhetuwal⁹, B Blaikie¹⁰, J Boyd¹¹, Q Campagna⁵, A Camsonne⁶, G D Cates¹¹, Y Chen⁸, C Clarke¹², J C Cornejo¹³, S Covrig Dusa⁶, M M Dalton⁶, P Datta¹⁴, A Deshpande^{12

15

16}, D Dutta⁹, C Feldman^{12

17}, E Fuchey¹⁴, C Gal^{9

11

12

15}, D Gaskell⁶, T Gautam¹⁸, M Gericke¹⁰, C Ghosh^{12

19}, I Halilovic¹⁰, J-O Hansen⁶, F Hauenstein²⁰, W Henry²¹, C J Horowitz²², C Jantzi¹¹, S Jian¹¹, S Johnston¹⁹, D C Jones²¹, B Karki²³, S Kakkar¹⁰, S Katugampola¹¹, C E Keppel⁶, P M King²³, D E King²⁴, M Knauss²⁵, K S Kumar¹⁹, T Kutz¹², N Lashley-Colthirst¹⁸, G Leverick¹⁰, H Liu¹⁹, N Liyange¹¹, S Malace⁶, J Mammei¹⁰, R Mammei²⁶, M McCaughan⁶, D McNulty¹, D Meekins⁶, C Metts⁵, R Michaels⁶, M Mihovilovic^{27

28}, M M Mondal^{12

15}, J Napolitano²¹, D Nikolaev²¹, M N H Rashad²⁰, V Owen⁵, C Palatchi^{11

15}, J Pan¹⁰, B Pandey¹⁸, S Park^{9

12}, K D Paschke¹¹, M Petrusky^{12

29}, M L Pitt³⁰, S Premathilake¹¹, A J R Puckett¹⁴, B Quinn¹³, R Radloff²³, S Rahman¹⁰, A Rathnayake¹¹, B T Reed²², P E Reimer³¹, R Richards¹², S Riordan³¹, Y Roblin⁶, S Seeds¹⁴, A Shahinyan³², P A Souder²⁴, L Tang^{6

18}, M Thiel³³, Y Tian²⁴, G M Urciuoli³⁴, E W Wertz⁵, B Wojtsekhowski⁶, W Xiong²⁴, B Yale⁵, T Ye¹², A Zec¹¹, W Zhang¹², J Zhang^{12

15

35}, X Zheng¹¹; PREX and CREX Collaborations

Affiliations

¹ Idaho State University, Pocatello, Idaho 83209, USA.
² Texas A & M University - Kingsville, Kingsville, Texas 78363, USA.
³ University of Zagreb, Faculty of Science, Zagreb HR 10002, Croatia.
⁴ California State University, Los Angeles, Los Angeles, California 90032, USA.
⁵ William & Mary, Williamsburg, Virginia 23185, USA.
⁶ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁷ Istituto Nazionale di Fisica Nucleare, Sezione di Catania, 95123 Catania, Italy.
⁸ Louisiana Tech University, Ruston, Louisiana 71272, USA.
⁹ Mississippi State University, Mississippi State, Mississippi 39762, USA.
¹⁰ University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
¹¹ University of Virginia, Charlottesville, Virginia 22904, USA.
¹² Stony Brook, State University of New York, Stony Brook, New York 11794, USA.
¹³ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Center for Frontiers in Nuclear Science, Stony Brook, New York 11794, USA.
¹⁶ Brookhaven National Laboratory, Upton, New York 11973, USA.
¹⁷ Institute for Advanced Computational Science, Stony Brook, New York 11794, USA.
¹⁸ Hampton University, Hampton, Virginia 23668, USA.
¹⁹ University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
²⁰ Old Dominion University, Norfolk, Virginia 23529, USA.
²¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
²² Indiana University, Bloomington, Indiana 47405, USA.
²³ Ohio University, Athens, Ohio 45701, USA.
²⁴ Syracuse University, Syracuse, New York 13244, USA.
²⁵ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
²⁶ University of Winnipeg, Winnipeg, Manitoba R3B2E9, Canada.
²⁷ Jôzef Stefan Institute, Ljubljana 1000, Slovenia.
²⁸ Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana 1000, Slovenia.
²⁹ University of Colorado Boulder, Boulder, Colorado 80309, USA.
³⁰ Virginia Tech, Blacksburg, Virginia 24061, USA.
³¹ Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
³² A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia.
³³ Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz 55099, Germany.
³⁴ INFN - Sezione di Roma, I-00185 Rome, Italy.
³⁵ Shandong University, Qingdao, Shandong 266237, China.

PMID: 35476486
DOI: 10.1103/PhysRevLett.128.142501

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

D Adhikari et al. Phys Rev Lett. 2022.

. 2022 Apr 8;128(14):142501.

doi: 10.1103/PhysRevLett.128.142501.

Authors

Affiliations

¹ Idaho State University, Pocatello, Idaho 83209, USA.
² Texas A & M University - Kingsville, Kingsville, Texas 78363, USA.
³ University of Zagreb, Faculty of Science, Zagreb HR 10002, Croatia.
⁴ California State University, Los Angeles, Los Angeles, California 90032, USA.
⁵ William & Mary, Williamsburg, Virginia 23185, USA.
⁶ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁷ Istituto Nazionale di Fisica Nucleare, Sezione di Catania, 95123 Catania, Italy.
⁸ Louisiana Tech University, Ruston, Louisiana 71272, USA.
⁹ Mississippi State University, Mississippi State, Mississippi 39762, USA.
¹⁰ University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
¹¹ University of Virginia, Charlottesville, Virginia 22904, USA.
¹² Stony Brook, State University of New York, Stony Brook, New York 11794, USA.
¹³ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Center for Frontiers in Nuclear Science, Stony Brook, New York 11794, USA.
¹⁶ Brookhaven National Laboratory, Upton, New York 11973, USA.
¹⁷ Institute for Advanced Computational Science, Stony Brook, New York 11794, USA.
¹⁸ Hampton University, Hampton, Virginia 23668, USA.
¹⁹ University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
²⁰ Old Dominion University, Norfolk, Virginia 23529, USA.
²¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
²² Indiana University, Bloomington, Indiana 47405, USA.
²³ Ohio University, Athens, Ohio 45701, USA.
²⁴ Syracuse University, Syracuse, New York 13244, USA.
²⁵ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
²⁶ University of Winnipeg, Winnipeg, Manitoba R3B2E9, Canada.
²⁷ Jôzef Stefan Institute, Ljubljana 1000, Slovenia.
²⁸ Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana 1000, Slovenia.
²⁹ University of Colorado Boulder, Boulder, Colorado 80309, USA.
³⁰ Virginia Tech, Blacksburg, Virginia 24061, USA.
³¹ Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
³² A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia.
³³ Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz 55099, Germany.
³⁴ INFN - Sezione di Roma, I-00185 Rome, Italy.
³⁵ Shandong University, Qingdao, Shandong 266237, China.

PMID: 35476486
DOI: 10.1103/PhysRevLett.128.142501

Abstract

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.

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New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

Affiliations

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

Authors

Affiliations

Abstract

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