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Multidimensional, High Precision Measurements of Beam Single Spin Asymmetries in Semi-inclusive π+ Electroproduction off Protons in the Valence Region

S. Diehl35,6, A. Kim6, G. Angelini13, K. Joo6, S. Adhikari11, M. Amaryan33, M. Arratia5, H. Atac44, H. Avakian45 et al. (CLAS Collaboration)

H. Avakian45, C. Ayerbe Gayoso52, N. A. Baltzell45, L. Barion15, S. Bastami6, M. Battaglieri45,17, I. Bedlinskiy28, F. Benmokhtar8, A. Bianconi48,20, A. S. Biselli9, M. Bondi17, F. Bossù3, S. Boiarinov45, K.-T. Brinkmann35, W. J. Briscoe13, W. Brooks46, D. Bulumulla33, V. D. Burkert45, D. S. Carman45, J. C. Carvajal11, A. Celentano17, P. Chatagnon21, T. Chetry27,32, G. Ciullo15,10, L. Clark49, B. A. Clary6, P. L. Cole25, M. Contalbrigo15, G. Costantini48,20, V. Crede12, A. D’Angelo18,38, N. Dashyan53, R. De Vita17, M. Defurne3, A. Deur45, C. Dilks7, C. Djalali32, M. Dugger2, R. Dupre21, H. Egiyan45, M. Ehrhart1,21, A. El Alaoui46, L. El Fassi27, L. Elouadrhiri45, S. Fegan50, A. Filippi19, T. Forest14, G. Gavalian45, G. P. Gilfoyle37, F. X. Girod45, D. I. Glazier49, A. A. Golubenko42, R. W. Gothe43, Y. Gotra45, K. A. Griffioen52, M. Guidal21, K. Hafidi1, H. Hakobyan46,53, M. Hattawy33, F. Hauenstein33,26, T. B. Hayward52, D. Heddle4,45, K. Hicks32, A. Hobart21, M. Holtrop29, C. E. Hyde33, D. G. Ireland49, E. L. Isupov42, H. S. Jo24, R. Johnston26, S. Joosten1, D. Keller51, M. Khachatryan33, A. Khanal11, W. Kim24, A. Kripko35, V. Kubarovsky45, S. E. Kuhn33, L. Lanza18, M. Leali48,20, S. Lee26, P. Lenisa15,10, K. Livingston49, Z. Lu39, I. J. D. MacGregor49, D. Marchand21, N. Markov45,6, L. Marsicano17, V. Mascagna47,20, B. McKinnon49, Z. E. Meziani1,44, R. G. Milner26, T. Mineeva46, M. Mirazita16, V. Mokeev45, P. Moran26, A. Movsisyan15, C. Munoz Camacho21, P. Nadel-Turonski45, P. Naidoo49, S. Nanda27, K. Neupane43, S. Niccolai21, G. Niculescu23, T. R. O’Connell6, M. Osipenko17, M. Paolone30,44, L. L. Pappalardo15,10, R. Paremuzyan45,29, E. Pasyuk45, W. Phelps4, O. Pogorelko28, Y. Prok33, A. Prokudin34,45, B. A. Raue11,45, M. Ripani17, J. Ritman22, A. Rizzo18,38, C. D. Roberts40, P. Rossi45,16, J. Rowley32, F. Sabatié3, C. Salgado31, A. Schmidt13, E. P. Segarra26, Y. G. Sharabian45, U. Shrestha32, P. Simmerling6, D. Sokhan49, O. Soto16,46, N. Sparveris44, S. Stepanyan45, P. Stoler36, I. I. Strakovsky13, S. Strauch43, K. Tezgin6, A. Thornton49, N. Tyler43, R. Tyson49, M. Ungaro45, L. Venturelli48,20, H. Voskanyan53, A. Vossen7, E. Voutier21, D. P. Watts50, K. Wei6, X. Wei45, S.-S. Xu41, B. Yale52, N. Zachariou50, and J. Zhang51 (CLAS Collaboration)

  • 1Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Arizona State University, Tempe, Arizona 85281, USA
  • 3IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
  • 4Christopher Newport University, Newport News, Virginia 23606, USA
  • 5University of California, Riverside, California 92521, USA
  • 6University of Connecticut, Storrs, Connecticut 06269, USA
  • 7Duke University, Durham, North Carolina 27708-0305, USA
  • 8Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA
  • 9Fairfield University, Fairfield, Connecticut 06824, USA
  • 10Universitá di Ferrara, 44121 Ferrara, Italy
  • 11Florida International University, Miami, Florida 33199, USA
  • 12Florida State University, Tallahassee, Florida 32306, USA
  • 13The George Washington University, Washington, D.C. 20052, USA
  • 14Idaho State University, Pocatello, Idaho 83209, USA
  • 15INFN, Sezione di Ferrara, 44100 Ferrara, Italy
  • 16INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
  • 17INFN, Sezione di Genova, 16146 Genova, Italy
  • 18INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy
  • 19INFN, Sezione di Torino, 10125 Torino, Italy
  • 20INFN, Sezione di Pavia, 27100 Pavia, Italy
  • 21Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
  • 22Institute fur Kernphysik (Juelich), Juelich, Germany
  • 23James Madison University, Harrisonburg, Virginia 22807, USA
  • 24Kyungpook National University, Daegu 41566, Republic of Korea
  • 25Lamar University, 4400 MLK Blvd, P.O. Box 10046, Beaumont, Texas 77710, USA
  • 26Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
  • 27Mississippi State University, Mississippi State, Mississippi 39762-5167, USA
  • 28National Research Centre Kurchatov Institute—ITEP, Moscow, 117259, Russia
  • 29University of New Hampshire, Durham, New Hampshire 03824-3568, USA
  • 30New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA
  • 31Norfolk State University, Norfolk, Virginia 23504, USA
  • 32Ohio University, Athens, Ohio 45701, USA
  • 33Old Dominion University, Norfolk, Virginia 23529, USA
  • 34Science Division, Penn State University Berks, Reading, Pennsylvania 19610, USA
  • 35II. Physikalisches Institut der Universität Gießen, 35392 Gießen, Germany
  • 36Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
  • 37University of Richmond, Richmond, Virginia 23173, USA
  • 38Università di Roma Tor Vergata, 00133 Rome Italy
  • 39School of Physics, Southeast University, Nanjing 211189, Jiangsu, China
  • 40School of Physics and Institute for Nonperturbative Physics, Nanjing University, Nanjing 210093, Jiangsu, China
  • 41School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China
  • 42Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia
  • 43University of South Carolina, Columbia, South Carolina 29208, USA
  • 44Temple University, Philadelphia, Pennsylvania 19122, USA
  • 45Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 46Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile
  • 47Università degli Studi dell’Insubria, 22100 Como, Italy
  • 48Università degli Studi di Brescia, 25123 Brescia, Italy
  • 49University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 50University of York, York YO10 5DD, United Kingdom
  • 51University of Virginia, Charlottesville, Virginia 22901, USA
  • 52College of William and Mary, Williamsburg, Virginia 23187-8795, USA
  • 53Yerevan Physics Institute, 375036 Yerevan, Armenia

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Phys. Rev. Lett. 128, 062005 – Published 11 February, 2022

DOI: https://doi.org/10.1103/PhysRevLett.128.062005

Abstract

High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single π+ SIDIS data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q2 ranging from 1–7  GeV2. In particular, the structure function ratio FLUsinϕ/FUU has been determined, where FLUsinϕ is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data’s impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions.

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Outline

Information

Phys. Rev. Lett. 128, 062005– Published 11 February, 2022
  • Received 10 January 2021
  • Revised 28 September 2021
  • Accepted 21 January 2022
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