Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region

D Ho¹, P Peng², C Bass³, P Collins⁴, A D'Angelo^{3

5}, A Deur³, J Fleming⁶, C Hanretty^{3

2}, T Kageya³, M Khandaker⁷, F J Klein⁸, E Klempt⁹, V Laine¹⁰, M M Lowry³, H Lu^{1

11}, C Nepali¹², V A Nikonov^{9

13}, T O'Connell¹⁴, A M Sandorfi³, A V Sarantsev^{9

13}, R A Schumacher¹, I I Strakovsky⁸, A Švarc¹⁵, N K Walford⁴, X Wei³, C S Whisnant¹⁶, R L Workman⁸, I Zonta⁵, K P Adhikari^{12

17}, D Adikaram¹², Z Akbar¹⁸, M J Amaryan¹², S Anefalos Pereira¹⁹, H Avakian³, J Ball²⁰, M Bashkanov⁶, M Battaglieri²¹, V Batourine³, I Bedlinskiy²², A Biselli²³, W J Briscoe⁸, V D Burkert³, D S Carman³, A Celentano²¹, G Charles^{12

20}, T Chetry²⁴, G Ciullo²⁵, L Clark²⁶, L Colaneri¹⁴, P L Cole²⁷, M Contalbrigo²⁵, V Crede¹⁸, N Dashyan²⁸, E De Sanctis¹⁹, R De Vita²¹, C Djalali²⁹, R Dupre^{30

20}, A El Alaoui^{31

32}, L El Fassi^{31

17}, L Elouadrhiri³, P Eugenio¹⁸, G Fedotov^{33

29}, S Fegan²⁶, R Fersch^{34

35}, A Filippi³⁶, A Fradi³⁰, Y Ghandilyan²⁸, G P Gilfoyle³⁷, F X Girod³, D I Glazier^{6

26}, C Gleason²⁹, W Gohn¹⁴, E Golovatch³³, R W Gothe²⁹, K A Griffioen³⁵, M Guidal³⁰, L Guo³⁸, H Hakobyan^{32

28}, N Harrison^{3

14}, M Hattawy³¹, K Hicks²⁴, M Holtrop³⁹, S M Hughes⁶, Y Ilieva²⁹, D G Ireland²⁶, B S Ishkhanov³³, E L Isupov³³, D Jenkins⁴⁰, H Jiang²⁹, H S Jo³⁰, K Joo¹⁴, S Joosten⁴¹, D Keller², G Khachatryan²⁸, A Kim^{14

42}, W Kim⁴², A Klein¹², V Kubarovsky³, S V Kuleshov^{22

32}, L Lanza⁵, P Lenisa²⁵, K Livingston²⁶, I J D MacGregor²⁶, N Markov¹⁴, B McKinnon²⁶, T Mineeva^{14

32}, V Mokeev³, R A Montgomery²⁶, A Movsisyan²⁵, C Munoz Camacho³⁰, G Murdoch²⁶, S Niccolai³⁰, G Niculescu¹⁶, M Osipenko²¹, M Paolone^{41

29}, R Paremuzyan^{39

28}, K Park³, E Pasyuk³, W Phelps³⁸, O Pogorelko²², J W Price⁴³, S Procureur²⁰, D Protopopescu²⁶, M Ripani²¹, D Riser¹⁴, B G Ritchie⁴⁴, A Rizzo⁵, G Rosner²⁶, F Sabatié²⁰, C Salgado⁷, Y G Sharabian³, Iu Skorodumina^{33

29}, G D Smith⁶, D I Sober⁴, D Sokhan^{30

26}, N Sparveris⁴¹, S Strauch²⁹, Ye Tian²⁹, B Torayev¹², M Ungaro³, H Voskanyan²⁸, E Voutier³⁰, D P Watts⁶, M H Wood⁴⁵, N Zachariou^{6

29}, J Zhang³, Z W Zhao²; CLAS Collaboration

Affiliations

¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
² University of Virginia, Charlottesville, Virginia 22903, USA.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Catholic University of America, Washington, D.C. 20064, USA.
⁵ Università di Roma "Tor Vergata" and INFN Sezione di Roma2, 00133 Roma, Italy.
⁶ Edinburgh University, Edinburgh EH9 3FD, United Kingdom.
⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
⁸ The George Washington University, Washington, D.C. 20052, USA.
⁹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53113 Bonn, Germany.
¹⁰ Université Blaise Pascal, Clermont-Ferrand, Aubière Cedex 63178 , France.
¹¹ University of Iowa, Iowa City, Iowa 52242, USA.
¹² Old Dominion University, Norfolk, Virginia 23529, USA.
¹³ Petersburg Nuclear Physics Institute, Gatchina 188300, Russia.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Rudjer Bošković Institute, Zagreb 10002, Croatia.
¹⁶ James Madison University, Harrisonburg, Virginia 22807, USA.
¹⁷ Mississippi State University, Mississippi State, Mississippi 39762, USA.
¹⁸ Florida State University, Tallahassee, Florida 32306, USA.
¹⁹ INFN, Laboratori Nazionali di Frascati, Frascati 00044, Italy.
²⁰ Irfu/SPhN, CEA, Université Paris-Saclay, Gif-sur-Yvette 91191 , France.
²¹ INFN, Sezione di Genova, Genova 16146, Italy.
²² Institute of Theoretical and Experimental Physics, Moscow 117259, Russia.
²³ Fairfield University, Fairfield, Connecticut 06824, USA.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ INFN Sezione di Ferrara and Universita' di Ferrara, Ferrara 44121, Italy.
²⁶ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
²⁷ Idaho State University, Pocatello, Idaho 83209, USA.
²⁸ Yerevan Physics Institute, Yerevan 375036, Armenia.
²⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁰ Institut de Physique Nucléaire, CNRS-IN2P3 and Université Paris Sud, Orsay 91406, France.
³¹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³² Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
³³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ College of William and Mary, Williamsburg, Virginia 23187, USA.
³⁶ INFN, Sezione di Torino, Torino 10125, Italy.
³⁷ University of Richmond, Richmond, Virginia 23173, USA.
³⁸ Florida International University, Miami, Florida 33199, USA.
³⁹ University of New Hampshire, Durham, New Hampshire 03824, USA.
⁴⁰ Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
⁴¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁴² Kyungpook National University, Daegu 41566, Republic of Korea.
⁴³ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁴ Arizona State University, Tempe, Arizona 85287, USA.
⁴⁵ Canisius College, Buffalo, New York 14208, USA.

PMID: 28665642
DOI: 10.1103/PhysRevLett.118.242002

Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region

D Ho et al. Phys Rev Lett. 2017.

. 2017 Jun 16;118(24):242002.

doi: 10.1103/PhysRevLett.118.242002. Epub 2017 Jun 16.

Authors

Affiliations

¹ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
² University of Virginia, Charlottesville, Virginia 22903, USA.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ Catholic University of America, Washington, D.C. 20064, USA.
⁵ Università di Roma "Tor Vergata" and INFN Sezione di Roma2, 00133 Roma, Italy.
⁶ Edinburgh University, Edinburgh EH9 3FD, United Kingdom.
⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
⁸ The George Washington University, Washington, D.C. 20052, USA.
⁹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53113 Bonn, Germany.
¹⁰ Université Blaise Pascal, Clermont-Ferrand, Aubière Cedex 63178 , France.
¹¹ University of Iowa, Iowa City, Iowa 52242, USA.
¹² Old Dominion University, Norfolk, Virginia 23529, USA.
¹³ Petersburg Nuclear Physics Institute, Gatchina 188300, Russia.
¹⁴ University of Connecticut, Storrs, Connecticut 06269, USA.
¹⁵ Rudjer Bošković Institute, Zagreb 10002, Croatia.
¹⁶ James Madison University, Harrisonburg, Virginia 22807, USA.
¹⁷ Mississippi State University, Mississippi State, Mississippi 39762, USA.
¹⁸ Florida State University, Tallahassee, Florida 32306, USA.
¹⁹ INFN, Laboratori Nazionali di Frascati, Frascati 00044, Italy.
²⁰ Irfu/SPhN, CEA, Université Paris-Saclay, Gif-sur-Yvette 91191 , France.
²¹ INFN, Sezione di Genova, Genova 16146, Italy.
²² Institute of Theoretical and Experimental Physics, Moscow 117259, Russia.
²³ Fairfield University, Fairfield, Connecticut 06824, USA.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ INFN Sezione di Ferrara and Universita' di Ferrara, Ferrara 44121, Italy.
²⁶ University of Glasgow, Glasgow G12 8QQ, United Kingdom.
²⁷ Idaho State University, Pocatello, Idaho 83209, USA.
²⁸ Yerevan Physics Institute, Yerevan 375036, Armenia.
²⁹ University of South Carolina, Columbia, South Carolina 29208, USA.
³⁰ Institut de Physique Nucléaire, CNRS-IN2P3 and Université Paris Sud, Orsay 91406, France.
³¹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³² Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
³³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
³⁴ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁵ College of William and Mary, Williamsburg, Virginia 23187, USA.
³⁶ INFN, Sezione di Torino, Torino 10125, Italy.
³⁷ University of Richmond, Richmond, Virginia 23173, USA.
³⁸ Florida International University, Miami, Florida 33199, USA.
³⁹ University of New Hampshire, Durham, New Hampshire 03824, USA.
⁴⁰ Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
⁴¹ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁴² Kyungpook National University, Daegu 41566, Republic of Korea.
⁴³ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁴ Arizona State University, Tempe, Arizona 85287, USA.
⁴⁵ Canisius College, Buffalo, New York 14208, USA.

PMID: 28665642
DOI: 10.1103/PhysRevLett.118.242002

Abstract

We report the first beam-target double-polarization asymmetries in the γ+n(p)→π^{-}+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN^{*} resonance photocouplings.

PubMed Disclaimer

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

Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region

Affiliations

Beam-Target Helicity Asymmetry for γ[over →]n[over →]→π^{-}p in the N^{*} Resonance Region

Authors

Affiliations

Abstract