First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

T Chetry^{1

2}, L El Fassi², W K Brooks^{3

4

5

6}, R Dupré⁷, A El Alaoui⁴, K Hafidi⁸, P Achenbach³, K P Adhikari², Z Akbar⁹, W R Armstrong⁸, M Arratia¹⁰, H Atac¹¹, H Avakian³, L Baashen¹, N A Baltzell³, L Barion¹², M Bashkanov¹³, M Battaglieri¹⁴, I Bedlinskiy¹⁵, B Benkel⁴, F Benmokhtar¹⁶, A Bianconi^{17

18}, A S Biselli^{19

20}, M Bondi²¹, W A Booth¹³, F Bossù²², S Boiarinov³, K-Th Brinkmann²³, W J Briscoe²⁴, D Bulumulla²⁵, V D Burkert³, D S Carman³, J C Carvajal¹, A Celentano¹⁴, P Chatagnon^{7

3}, V Chesnokov^{26

27}, G Ciullo^{28

12}, P L Cole^{29

30

3}, M Contalbrigo¹², G Costantini^{17

18}, A D'Angelo^{21

31}, N Dashyan³², R De Vita¹⁴, M Defurne²², A Deur³, S Diehl^{33

23}, C Djalali^{26

34}, H Egiyan³, L Elouadrhiri³, P Eugenio³⁵, S Fegan¹³, A Filippi³⁶, G Gavalian^{37

3}, Y Ghandilyan³², G P Gilfoyle³⁸, D I Glazier³⁹, A A Golubenko²⁷, G Gosta¹⁸, R W Gothe³⁴, K A Griffioen⁴⁰, M Guidal⁷, L Guo¹, H Hakobyan⁴, M Hattawy²⁵, T B Hayward³³, D Heddle^{41

3}, A Hobart⁷, M Holtrop³⁷, Y Ilieva³⁴, D G Ireland³⁹, E L Isupov²⁷, D Jenkins⁴², H S Jo⁴³, M L Kabir², A Khanal¹, M Khandaker⁴⁴, A Kim³³, W Kim⁴³, F J Klein²⁹, A Kripko²³, V Kubarovsky^{45

3}, V Lagerquist²⁵, L Lanza²¹, M Leali^{17

18}, S Lee⁸, P Lenisa^{28

12}, X Li⁴⁶, K Livingston³⁹, I J D MacGregor³⁹, D Marchand⁷, V Mascagna^{17

18}, B McKinnon³⁹, C McLauchlin³⁴, Z E Meziani^{8

11}, S Migliorati^{17

18}, T Mineeva⁴, M Mirazita⁴⁷, V Mokeev³, C Munoz Camacho⁷, P Nadel-Turonski³, K Neupane³⁴, S Niccolai⁷, M Nicol¹³, G Niculescu⁴⁸, M Osipenko¹⁴, A I Ostrovidov³⁵, P Pandey²⁵, M Paolone⁴⁹, L L Pappalardo^{28

12}, R Paremuzyan^{37

3}, E Pasyuk³, S J Paul¹⁰, W Phelps^{41

24}, N Pilleux⁷, M Pokhrel²⁵, J Poudel²⁵, J W Price⁵⁰, Y Prok^{25

9}, B A Raue¹, T Reed¹, J Richards³³, M Ripani¹⁴, J Ritman^{51

52}, G Rosner³⁹, F Sabatié²², C Salgado⁴⁴, S Schadmand⁵¹, A Schmidt^{24

46}, R A Schumacher¹⁹, Y G Sharabian³, E V Shirokov²⁷, U Shrestha³³, P Simmerling³³, D Sokhan^{22

39}, N Sparveris¹¹, S Stepanyan³, I I Strakovsky²⁴, S Strauch^{24

34}, J A Tan⁴³, N Trotta³³, R Tyson³⁹, M Ungaro^{45

3}, S Vallarino¹², L Venturelli^{17

18}, H Voskanyan³², E Voutier⁷, X Wei³, L B Weinstein²⁵, R Williams¹³, R Wishart³⁹, M H Wood^{53

34}, M Yurov², N Zachariou¹³, Z W Zhao^{54

25}, M Zurek⁸; CLAS Collaboration

Affiliations

¹ Florida International University, Miami, Florida 33199, USA.
² Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Universidad Técnica Federico Santa María, Casilla, 110-V Valparaíso, Chile.
⁵ Center for Science and Technology of Valparaíso, 699 Valparaíso, Chile.
⁶ SAPHIR Millennium Science Institute, Santiago, Chile.
⁷ Universit'e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
⁸ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁹ University of Virginia, Charlottesville, Virginia 22901, USA.
¹⁰ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
¹¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹² INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹³ University of York, York YO10 5DD, United Kingdom.
¹⁴ INFN, Sezione di Genova, 16146 Genova, Italy.
¹⁵ National Research Centre Kurchatov Institute - ITEP, Moscow 117259, Russia.
¹⁶ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁷ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁸ Universit'a degli Studi di Brescia, 25123 Brescia, Italy.
¹⁹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
²⁰ Fairfield University, Fairfield, Connecticut 06824, USA.
²¹ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²² IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
²³ II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
²⁴ The George Washington University, Washington, D.C. 20052, USA.
²⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
²⁶ Ohio University, Athens, Ohio 45701, USA.
²⁷ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²⁸ Universita' di Ferrara, 44121 Ferrara, Italy.
²⁹ Catholic University of America, Washington, D.C. 20064, USA.
³⁰ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
³¹ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
³² Yerevan Physics Institute, 375036 Yerevan, Armenia.
³³ University of Connecticut, Storrs, Connecticut 06269, USA.
³⁴ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁵ Florida State University, Tallahassee, Florida 32306, USA.
³⁶ INFN, Sezione di Torino, 10125 Torino, Italy.
³⁷ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁸ University of Richmond, Richmond, Virginia 23173, USA.
³⁹ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁴⁰ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
⁴¹ Christopher Newport University, Newport News, Virginia 23606, USA.
⁴² Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
⁴³ Kyungpook National University, Daegu 41566, Republic of Korea.
⁴⁴ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁵ Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁴⁶ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
⁴⁷ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴⁸ James Madison University, Harrisonburg, Virginia 22807, USA.
⁴⁹ New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁵⁰ California State University, Dominguez Hills, Carson, California 90747, USA.
⁵¹ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
⁵² Institut fur Kernphysik (Juelich), Juelich 52428, Germany.
⁵³ Canisius College, Buffalo, New York 14208, USA.
⁵⁴ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 37084423
DOI: 10.1103/PhysRevLett.130.142301

First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

T Chetry et al. Phys Rev Lett. 2023.

. 2023 Apr 7;130(14):142301.

doi: 10.1103/PhysRevLett.130.142301.

Authors

Affiliations

¹ Florida International University, Miami, Florida 33199, USA.
² Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Universidad Técnica Federico Santa María, Casilla, 110-V Valparaíso, Chile.
⁵ Center for Science and Technology of Valparaíso, 699 Valparaíso, Chile.
⁶ SAPHIR Millennium Science Institute, Santiago, Chile.
⁷ Universit'e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
⁸ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁹ University of Virginia, Charlottesville, Virginia 22901, USA.
¹⁰ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
¹¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹² INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹³ University of York, York YO10 5DD, United Kingdom.
¹⁴ INFN, Sezione di Genova, 16146 Genova, Italy.
¹⁵ National Research Centre Kurchatov Institute - ITEP, Moscow 117259, Russia.
¹⁶ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁷ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁸ Universit'a degli Studi di Brescia, 25123 Brescia, Italy.
¹⁹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
²⁰ Fairfield University, Fairfield, Connecticut 06824, USA.
²¹ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²² IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
²³ II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
²⁴ The George Washington University, Washington, D.C. 20052, USA.
²⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
²⁶ Ohio University, Athens, Ohio 45701, USA.
²⁷ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²⁸ Universita' di Ferrara, 44121 Ferrara, Italy.
²⁹ Catholic University of America, Washington, D.C. 20064, USA.
³⁰ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
³¹ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
³² Yerevan Physics Institute, 375036 Yerevan, Armenia.
³³ University of Connecticut, Storrs, Connecticut 06269, USA.
³⁴ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁵ Florida State University, Tallahassee, Florida 32306, USA.
³⁶ INFN, Sezione di Torino, 10125 Torino, Italy.
³⁷ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁸ University of Richmond, Richmond, Virginia 23173, USA.
³⁹ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁴⁰ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
⁴¹ Christopher Newport University, Newport News, Virginia 23606, USA.
⁴² Virginia Tech, Blacksburg, Virginia 24061-0435, USA.
⁴³ Kyungpook National University, Daegu 41566, Republic of Korea.
⁴⁴ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁵ Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
⁴⁶ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
⁴⁷ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴⁸ James Madison University, Harrisonburg, Virginia 22807, USA.
⁴⁹ New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁵⁰ California State University, Dominguez Hills, Carson, California 90747, USA.
⁵¹ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
⁵² Institut fur Kernphysik (Juelich), Juelich 52428, Germany.
⁵³ Canisius College, Buffalo, New York 14208, USA.
⁵⁴ Duke University, Durham, North Carolina 27708-0305, USA.

PMID: 37084423
DOI: 10.1103/PhysRevLett.130.142301

Abstract

We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These results represent the first measurements of the Λ multiplicity ratio and transverse momentum broadening as a function of the energy fraction (z) in the current and target fragmentation regions. The multiplicity ratio exhibits a strong suppression at high z and an enhancement at low z. The measured transverse momentum broadening is an order of magnitude greater than that seen for light mesons. This indicates that the propagating entity interacts very strongly with the nuclear medium, which suggests that propagation of diquark configurations in the nuclear medium takes place at least part of the time, even at high z. The trends of these results are qualitatively described by the Giessen Boltzmann-Uehling-Uhlenbeck transport model, particularly for the multiplicity ratios. These observations will potentially open a new era of studies of the structure of the nucleon as well as of strange baryons.

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First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

Affiliations

First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions

Authors

Affiliations

Abstract