Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e')

Y-W Zhang^{1

2}, E Long³, M Mihovilovič⁴, G Jin⁵, K Allada⁶, B Anderson³, J R M Annand⁷, T Averett⁸, C Ayerbe-Gayoso⁸, W Boeglin⁹, P Bradshaw⁸, A Camsonne⁶, M Canan¹⁰, G D Cates⁵, C Chen¹¹, J P Chen⁶, E Chudakov⁶, R De Leo¹², X Deng⁵, A Deur⁶, C Dutta¹³, L El Fassi¹, D Flay¹⁴, S Frullani¹⁵, F Garibaldi¹⁵, H Gao¹⁶, S Gilad¹⁷, R Gilman¹, O Glamazdin¹⁸, S Golge¹⁰, J Gomez⁶, O Hansen⁶, D W Higinbotham⁶, T Holmstrom¹⁹, J Huang^{17

20}, H Ibrahim²¹, C W de Jager⁶, E Jensen²², X Jiang²⁰, J St John¹⁹, M Jones⁶, H Kang²³, J Katich⁸, H P Khanal⁹, P King²⁴, W Korsch¹³, J LeRose⁶, R Lindgren⁵, H-J Lu²⁵, W Luo²⁶, P Markowitz⁹, M Meziane⁸, R Michaels⁶, B Moffit⁶, P Monaghan¹¹, N Muangma¹⁷, S Nanda⁶, B E Norum⁵, K Pan¹⁷, D Parno²⁷, E Piasetzky²⁸, M Posik¹⁴, V Punjabi²⁹, A J R Puckett²⁰, X Qian¹⁶, Y Qiang⁶, X Qiu²⁶, S Riordan⁵, G Ron³⁰, A Saha⁶, B Sawatzky⁶, R Schiavilla^{6

10}, B Schoenrock³¹, M Shabestari⁵, A Shahinyan³², S Širca^{4

33}, R Subedi³⁴, V Sulkosky¹⁷, W A Tobias⁵, W Tireman³¹, G M Urciuoli¹⁵, D Wang⁵, K Wang⁵, Y Wang³⁵, J Watson⁶, B Wojtsekhowski⁶, Z Ye¹¹, X Zhan¹⁷, Y Zhang²⁶, X Zheng⁵, B Zhao⁸, L Zhu¹¹; Jefferson Lab Hall A Collaboration

Affiliations

¹ Rutgers University, New Brunswick, New Jersey 08901, USA.
² University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
³ Kent State University, Kent, Ohio 44242, USA.
⁴ Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
⁵ University of Virginia, Charlottesville, Virginia 22908, USA.
⁶ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁷ Glasgow University, Glasgow G12 8QQ Scotland, United Kingdom.
⁸ The College of William and Mary, Williamsburg, Virginia 23187, USA.
⁹ Florida International University, Miami, Florida 33181, USA.
¹⁰ Old Dominion University, Norfolk, Virginia 23529, USA.
¹¹ Hampton University, Hampton, Virginia 23669, USA.
¹² Università degli studi di Bari Aldo Moro, I-70121 Bari, Italy.
¹³ University of Kentucky, Lexington, Kentucky 40506, USA.
¹⁴ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹⁵ Istituto Nazionale Di Fisica Nucleare, INFN/Sanita, 00161 Roma, Italy.
¹⁶ Duke University, Durham, North Carolina 27708, USA.
¹⁷ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
¹⁸ Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
¹⁹ Longwood University, Farmville, Virginia 23909, USA.
²⁰ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
²¹ Cairo University, Cairo, Giza 12613, Egypt.
²² Christopher Newport University, Newport News, Virginia 23606, USA.
²³ Seoul National University, Seoul 151-742, Korea.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ Huangshan University, Tunxi, Huangshan City, Anhui Province 245041, People's Republic of China.
²⁶ Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China.
²⁷ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
²⁸ Tel Aviv University, Tel Aviv 69978, Israel.
²⁹ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁰ Hebrew University of Jerusalem, Jerusalem 91904, Israel.
³¹ Northern Michigan University, Marquette, Michigan 49855, USA.
³² Yerevan Physics Institute, Yerevan 375036, Armenia.
³³ University of Ljubljana, SI-1000 Ljubljana, Slovenia.
³⁴ George Washington University, Washington, D.C. 20052, USA.
³⁵ University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

PMID: 26551107
DOI: 10.1103/PhysRevLett.115.172502

Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e')

Y-W Zhang et al. Phys Rev Lett. 2015.

. 2015 Oct 23;115(17):172502.

doi: 10.1103/PhysRevLett.115.172502. Epub 2015 Oct 22.

Authors

Affiliations

¹ Rutgers University, New Brunswick, New Jersey 08901, USA.
² University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
³ Kent State University, Kent, Ohio 44242, USA.
⁴ Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
⁵ University of Virginia, Charlottesville, Virginia 22908, USA.
⁶ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁷ Glasgow University, Glasgow G12 8QQ Scotland, United Kingdom.
⁸ The College of William and Mary, Williamsburg, Virginia 23187, USA.
⁹ Florida International University, Miami, Florida 33181, USA.
¹⁰ Old Dominion University, Norfolk, Virginia 23529, USA.
¹¹ Hampton University, Hampton, Virginia 23669, USA.
¹² Università degli studi di Bari Aldo Moro, I-70121 Bari, Italy.
¹³ University of Kentucky, Lexington, Kentucky 40506, USA.
¹⁴ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹⁵ Istituto Nazionale Di Fisica Nucleare, INFN/Sanita, 00161 Roma, Italy.
¹⁶ Duke University, Durham, North Carolina 27708, USA.
¹⁷ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
¹⁸ Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
¹⁹ Longwood University, Farmville, Virginia 23909, USA.
²⁰ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
²¹ Cairo University, Cairo, Giza 12613, Egypt.
²² Christopher Newport University, Newport News, Virginia 23606, USA.
²³ Seoul National University, Seoul 151-742, Korea.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ Huangshan University, Tunxi, Huangshan City, Anhui Province 245041, People's Republic of China.
²⁶ Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China.
²⁷ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
²⁸ Tel Aviv University, Tel Aviv 69978, Israel.
²⁹ Norfolk State University, Norfolk, Virginia 23504, USA.
³⁰ Hebrew University of Jerusalem, Jerusalem 91904, Israel.
³¹ Northern Michigan University, Marquette, Michigan 49855, USA.
³² Yerevan Physics Institute, Yerevan 375036, Armenia.
³³ University of Ljubljana, SI-1000 Ljubljana, Slovenia.
³⁴ George Washington University, Washington, D.C. 20052, USA.
³⁵ University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

PMID: 26551107
DOI: 10.1103/PhysRevLett.115.172502

Abstract

We report the first measurement of the target single-spin asymmetry, A(y), in quasielastic scattering from the inclusive reaction (3)He(↑)(e,e') on a (3)He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this asymmetry is strictly zero for one-photon exchange. A nonzero A(y) can arise from the interference between the one- and two-photon exchange processes which is sensitive to the details of the substructure of the nucleon. An experiment recently completed at Jefferson Lab yielded asymmetries with high statistical precision at Q(2)=0.13, 0.46, and 0.97 GeV(2). These measurements demonstrate, for the first time, that the (3)He asymmetry is clearly nonzero and negative at the 4σ-9σ level. Using measured proton-to-(3)He cross-section ratios and the effective polarization approximation, neutron asymmetries of -(1-3)% were obtained. The neutron asymmetry at high Q(2) is related to moments of the generalized parton distributions (GPDs). Our measured neutron asymmetry at Q(2)=0.97 GeV(2) agrees well with a prediction based on two-photon exchange using a GPD model and thus provides a new, independent constraint on these distributions.

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Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e')

Affiliations

Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e')

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources

Miscellaneous