First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton

S Diehl^{1

2}, N Trotta¹, K Joo¹, P Achenbach³, Z Akbar^{4

5}, W R Armstrong⁶, H Atac⁷, H Avakian³, L Baashen⁸, N A Baltzell³, L Barion⁹, M Bashkanov¹⁰, M Battaglieri¹¹, I Bedlinskiy¹², F Benmokhtar¹³, A Bianconi^{14

15}, A S Biselli¹⁶, F Bossù¹⁷, K-T Brinkmann², W J Briscoe¹⁸, D Bulumulla¹⁹, V Burkert³, R Capobianco¹, D S Carman³, J C Carvajal⁸, A Celentano¹¹, G Charles^{20

19}, P Chatagnon^{20

3}, V Chesnokov²¹, G Ciullo^{22

9}, P L Cole²³, M Contalbrigo⁹, G Costantini^{14

15}, V Crede⁴, A D'Angelo^{24

25}, N Dashyan²⁶, R De Vita¹¹, A Deur³, C Djalali^{27

28}, R Dupre²⁰, M Ehrhart²⁰, A El Alaoui²⁹, L El Fassi³⁰, L Elouadrhiri³, S Fegan¹⁰, A Filippi³¹, G Gavalian³, D I Glazier³², A A Golubenko²¹, G Gosta^{14

15}, R W Gothe²⁸, Y Gotra³, K Griffioen³³, K Hafidi⁶, H Hakobyan²⁹, M Hattawy^{6

19}, T B Hayward¹, D Heddle^{34

3}, A Hobart²⁰, M Holtrop³⁵, I Illari¹⁸, D G Ireland³², E L Isupov²¹, H S Jo³⁶, R Johnston³⁷, D Keller⁵, M Khachatryan¹⁹, A Khanal⁸, A Kim¹, W Kim³⁶, V Klimenko¹, A Kripko², V Kubarovsky³, S E Kuhn¹⁹, V Lagerquist¹⁹, L Lanza^{24

25}, M Leali^{14

15}, S Lee⁶, P Lenisa^{22

9}, X Li³⁷, I J D MacGregor³², D Marchand²⁰, V Mascagna^{14

38

15}, G Matousek³⁹, B McKinnon³², C McLauchlin²⁸, Z E Meziani^{6

7}, S Migliorati^{14

15}, R G Milner³⁷, T Mineeva²⁹, M Mirazita⁴⁰, V Mokeev³, P Moran³⁷, C Munoz Camacho²⁰, P Naidoo³², K Neupane²⁸, S Niccolai²⁰, G Niculescu⁴¹, M Osipenko¹¹, P Pandey¹⁹, M Paolone^{42

7}, L L Pappalardo^{22

9}, R Paremuzyan^{35

3}, S J Paul⁴³, W Phelps^{34

18}, N Pilleux²⁰, M Pokhrel¹⁹, J Poudel¹⁹, J W Price⁴⁴, Y Prok¹⁹, A Radic²⁹, B A Raue⁸, T Reed⁸, J Richards¹, M Ripani¹¹, J Ritman^{45

46}, P Rossi^{40

3}, F Sabatié¹⁷, C Salgado⁴⁷, S Schadmand⁴⁵, A Schmidt^{18

37}, Y G Sharabian³, U Shrestha^{1

27}, D Sokhan^{17

32}, N Sparveris⁷, M Spreafico¹¹, S Stepanyan³, I Strakovsky¹⁸, S Strauch²⁸, M Turisini⁴⁰, R Tyson³², M Ungaro³, S Vallarino⁹, L Venturelli^{14

15}, H Voskanyan²⁶, E Voutier²⁰, D P Watts¹⁰, X Wei³, R Williams¹⁰, R Wishart³², M H Wood⁴⁸, M Yurov³⁰, N Zachariou¹⁰, Z W Zhao^{39

19}, M Zurek⁶; CLAS Collaboration

Affiliations

¹ University of Connecticut, Storrs, Connecticut 06269, USA.
² II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Florida State University, Tallahassee, Florida 32306, USA.
⁵ University of Virginia, Charlottesville, Virginia 22901, USA.
⁶ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁷ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁸ Florida International University, Miami, Florida 33199, USA.
⁹ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁰ University of York, York YO10 5DD, United Kingdom.
¹¹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹² National Research Centre Kurchatov Institute-TEP, Moscow, 117259, Russia.
¹³ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁴ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁵ Università degli Studi di Brescia, 25123 Brescia, Italy.
¹⁶ Fairfield University, Fairfield Connecticut 06824, USA.
¹⁷ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
¹⁸ The George Washington University, Washington, D.C. 20052, USA.
¹⁹ Old Dominion University, Norfolk, Virginia 23529, USA.
²⁰ Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
²¹ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²² Università di Ferrara, 44121 Ferrara, Italy.
²³ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
²⁴ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁵ Università di Roma Tor Vergata, 00133 Rome, Italy.
²⁶ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁷ Ohio University, Athens, Ohio 45701, USA.
²⁸ University of South Carolina, Columbia, South Carolina 29208, USA.
²⁹ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
³⁰ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³¹ INFN, Sezione di Torino, 10125 Torino, Italy.
³² University of Glasgow, Glasgow G12 8QQ, United Kingdom.
³³ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁶ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁷ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
³⁸ Università degli Studi dell'Insubria, 22100 Como, Italy.
³⁹ Duke University, Durham, North Carolina 27708-0305, USA.
⁴⁰ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴¹ James Madison University, Harrisonburg, Virginia 22807, USA.
⁴² New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁴³ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
⁴⁴ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁵ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
⁴⁶ Institute fur Kernphysik (Juelich), Juelich, Germany.
⁴⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁸ Canisius College, Buffalo, New York 14208-1517, USA.

PMID: 37505937
DOI: 10.1103/PhysRevLett.131.021901

Free article

First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton

S Diehl et al. Phys Rev Lett. 2023.

Free article

. 2023 Jul 14;131(2):021901.

doi: 10.1103/PhysRevLett.131.021901.

Authors

Affiliations

¹ University of Connecticut, Storrs, Connecticut 06269, USA.
² II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Florida State University, Tallahassee, Florida 32306, USA.
⁵ University of Virginia, Charlottesville, Virginia 22901, USA.
⁶ Argonne National Laboratory, Argonne, Illinois 60439, USA.
⁷ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁸ Florida International University, Miami, Florida 33199, USA.
⁹ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁰ University of York, York YO10 5DD, United Kingdom.
¹¹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹² National Research Centre Kurchatov Institute-TEP, Moscow, 117259, Russia.
¹³ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁴ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁵ Università degli Studi di Brescia, 25123 Brescia, Italy.
¹⁶ Fairfield University, Fairfield Connecticut 06824, USA.
¹⁷ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
¹⁸ The George Washington University, Washington, D.C. 20052, USA.
¹⁹ Old Dominion University, Norfolk, Virginia 23529, USA.
²⁰ Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
²¹ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²² Università di Ferrara, 44121 Ferrara, Italy.
²³ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
²⁴ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
²⁵ Università di Roma Tor Vergata, 00133 Rome, Italy.
²⁶ Yerevan Physics Institute, 375036 Yerevan, Armenia.
²⁷ Ohio University, Athens, Ohio 45701, USA.
²⁸ University of South Carolina, Columbia, South Carolina 29208, USA.
²⁹ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
³⁰ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
³¹ INFN, Sezione di Torino, 10125 Torino, Italy.
³² University of Glasgow, Glasgow G12 8QQ, United Kingdom.
³³ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁶ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁷ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
³⁸ Università degli Studi dell'Insubria, 22100 Como, Italy.
³⁹ Duke University, Durham, North Carolina 27708-0305, USA.
⁴⁰ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴¹ James Madison University, Harrisonburg, Virginia 22807, USA.
⁴² New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁴³ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
⁴⁴ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁵ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
⁴⁶ Institute fur Kernphysik (Juelich), Juelich, Germany.
⁴⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁸ Canisius College, Buffalo, New York 14208-1517, USA.

PMID: 37505937
DOI: 10.1103/PhysRevLett.131.021901

Abstract

The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV^{2} up to 7 GeV^{2}. The reaction provides a novel access to the d-quark content of the nucleon and to p→Δ^{++} transition generalized parton distributions. A comparison to existing results for hard exclusive π^{+}n and π^{0}p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.

PubMed Disclaimer

LinkOut - more resources

Full Text Sources
- White Rose Research Online
Miscellaneous
- NCI CPTAC Assay Portal

Save citation to file

Email citation

Add to Collections

Add to My Bibliography

Your saved search

Create a file for external citation management software

Your RSS Feed

First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton

Affiliations

First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources

Miscellaneous