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Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

M. Mirazita19, H. Avakian42, A. Courtoy15, S. Pisano5, S. Adhikari13, M. J. Amaryan35, Giovanni Angelini16, H. Atac41, N. A. Baltzell42 et al. (CLAS Collaboration)

N. A. Baltzell42, L. Barion18, M. Battaglieri42,20, I. Bedlinskiy31, Fatiha Benmokhtar10, A. Bianconi45,23, A. S. Biselli11,3, F. Bossù6, S. Boiarinov42, W. J. Briscoe16, W. K. Brooks43,42, D. Bulumulla35, V. D. Burkert42, D. S. Carman42, J. C. Carvajal13, A. Celentano20, P. Chatagnon24, T. Chetry30, G. Ciullo18,12, B. Clary8, P. L. Cole28,42, M. Contalbrigo18, V. Crede14, A. D’Angelo21,38, N. Dashyan51, R. De Vita20, M. Defurne6, A. Deur42, S. Diehl8, C. Dilks9, C. Djalali34,40, R. Dupre24, H. Egiyan42, M. Ehrhart1, A. El Alaoui43, L. El Fassi30, P. Eugenio14, S. Fegan47, R. Fersch7,50, A. Filippi22, T. A. Forest17, Y. Ghandilyan51, G. Gavalian42,32, G. P. Gilfoyle37, K. L. Giovanetti26, F. X. Girod42, D. I. Glazier46, E. Golovatch39, R. W. Gothe40, K. A. Griffioen50, M. Guidal24, L. Guo13,42, K. Hafidi1, H. Hakobyan43,51, M. Hattawy35, T. B. Hayward50, D. Heddle7,42, K. Hicks34, A. Hobart24, M. Holtrop32, Q. Huang6, Y. Ilieva40,16, D. G. Ireland46, B. S. Ishkhanov39, E. L. Isupov39, D. Jenkins48, H. S. Jo27,24, K. Joo8, D. Keller49, A. Khanal13, M. Khandaker33,*, C. W. Kim16, W. Kim27, F. J. Klein4, V. Kubarovsky42,36, S. E. Kuhn35, L. Lanza21, M. Leali45,23, P. Lenisa18,12, K. Livingston46, I. J. D. MacGregor46, D. Marchand24, N. Markov42,8, L. Marsicano20, V. Mascagna44,23,†, B. McKinnon46, R. G. Milner29, T. Mineeva43, V. Mokeev42,39, C. Mullen20, C. Munoz Camacho24, K. Neupane40, G. Niculescu26,34, T. O’Connell8, M. Osipenko20, M. Paolone41, L. L. Pappalardo18,12, R. Paremuzyan42, K. Park27,‡, E. Pasyuk42, W. Phelps7, D. Pocanic49, O. Pogorelko31, J. Poudel35, Y. Prok35,49, B. A. Raue13,42, M. Ripani20, J. Ritman25, A. Rizzo21,38, P. Rossi42,19, F. Sabatié6, C. Salgado33, A. Schmidt16, R. A. Schumacher3, Y. G. Sharabian42, U. Shrestha34, O. Soto19, N. Sparveris41, S. Stepanyan42, I. I. Strakovsky16, S. Strauch40,16, N. Tyler40, M. Ungaro42,36, L. Venturelli45,23, H. Voskanyan51, A. Vossen9, E. Voutier24, D. Watts47, K. Wei8, X. Wei42, M. H. Wood2,40, B. Yale50, N. Zachariou47, J. Zhang49, and Z. W. Zhao9 (CLAS Collaboration)

  • 1Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Canisius College, Buffalo, New York 14208, USA
  • 3Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 4Catholic University of America, Washington, D.C. 20064, USA
  • 5Centro Fermi—Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, 00184 Rome, Italy
  • 6IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
  • 7Christopher Newport University, Newport News, Virginia 23606, USA
  • 8University of Connecticut, Storrs, Connecticut 06269, USA
  • 9Duke University, Durham, North Carolina 27708-0305, USA
  • 10Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA
  • 11Fairfield University, Fairfield Connecticut 06824, USA
  • 12Universita’ di Ferrara, 44121 Ferrara, Italy
  • 13Florida International University, Miami, Florida 33199, USA
  • 14Florida State University, Tallahassee, Florida 32306, USA
  • 15Instituto de Física, Universidad Nacional Autónoma de México Apartado Postal 20-364, Ciudad de México 01000, Mexico
  • 16The George Washington University, Washington, D.C. 20052, USA
  • 17Idaho State University, Pocatello, Idaho 83209, USA
  • 18INFN, Sezione di Ferrara, 44100 Ferrara, Italy
  • 19INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
  • 20INFN, Sezione di Genova, 16146 Genova, Italy
  • 21INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy
  • 22INFN, Sezione di Torino, 10125 Torino, Italy
  • 23INFN, Sezione di Pavia, 27100 Pavia, Italy
  • 24Universit’e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
  • 25Institute fur Kernphysik (Juelich), Juelich 52428, Germany
  • 26James Madison University, Harrisonburg, Virginia 22807, USA
  • 27Kyungpook National University, Daegu 41566, Republic of Korea
  • 28Lamar University, 4400 MLK Blvd, PO Box 10009, Beaumont, Texas 77710, USA
  • 29Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
  • 30Mississippi State University, Mississippi State, Mississippi 39762-5167, USA
  • 31National Research Centre Kurchatov Institute—ITEP, Moscow 117259, Russia
  • 32University of New Hampshire, Durham, New Hampshire 03824-3568, USA
  • 33Norfolk State University, Norfolk, Virginia 23504, USA
  • 34Ohio University, Athens, Ohio 45701, USA
  • 35Old Dominion University, Norfolk, Virginia 23529, USA
  • 36Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
  • 37University of Richmond, Richmond, Virginia 23173, USA
  • 38Universita’ di Roma Tor Vergata, 00133 Rome Italy
  • 39Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia
  • 40University of South Carolina, Columbia, South Carolina 29208, USA
  • 41Temple University, Philadelphia, Pennsylvania 19122, USA
  • 42Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 43Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile
  • 44Università degli Studi dell’Insubria, 22100 Como, Italy
  • 45Università degli Studi di Brescia, 25123 Brescia, Italy
  • 46University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 47University of York, York YO10 5DD, United Kingdom
  • 48Virginia Tech, Blacksburg, Virginia 24061-0435, USA
  • 49University of Virginia, Charlottesville, Virginia 22901, USA
  • 50College of William and Mary, Williamsburg, Virginia 23187-8795, USA
  • 51Yerevan Physics Institute, 375036 Yerevan, Armenia

  • *Current address: Idaho State University, Pocatello, Idaho 83209, USA.
  • †Current address: Università degli Studi di Brescia, 25123 Brescia, Italy.
  • ‡Current address: Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
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Phys. Rev. Lett. 126, 062002 – Published 12 February, 2021

DOI: https://doi.org/10.1103/PhysRevLett.126.062002

Abstract

A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinϕR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

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Phys. Rev. Lett. 126, 062002– Published 12 February, 2021
  • Received 26 October 2020
  • Revised 23 December 2020
  • Accepted 12 January 2021
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