Rosenbluth Separation of the π^{0} Electroproduction Cross Section

M Defurne¹, M Mazouz², Z Ahmed³, H Albataineh⁴, K Allada⁵, K A Aniol⁶, V Bellini⁷, M Benali⁸, W Boeglin⁹, P Bertin^{8

10}, M Brossard⁸, A Camsonne¹⁰, M Canan¹¹, S Chandavar¹², C Chen¹³, J-P Chen¹⁰, C W de Jager¹⁰, R de Leo¹⁴, C Desnault¹⁵, A Deur¹⁰, L El Fassi¹⁶, R Ent¹⁰, D Flay¹⁷, M Friend¹⁸, E Fuchey⁸, S Frullani¹⁹, F Garibaldi¹⁹, D Gaskell¹⁰, A Giusa⁷, O Glamazdin²⁰, S Golge²¹, J Gomez¹⁰, O Hansen¹⁰, D Higinbotham¹⁰, T Holmstrom²², T Horn²³, J Huang⁵, M Huang²⁴, G M Huber²⁵, C E Hyde^{8

11}, S Iqbal⁶, F Itard⁸, Ho Kang²⁶, Hy Kang²⁶, A Kelleher²⁷, C Keppel¹⁰, S Koirala¹¹, I Korover²⁸, J J LeRose¹⁰, R Lindgren²⁹, E Long³⁰, M Magne⁸, J Mammei³¹, D J Margaziotis⁶, P Markowitz⁹, A Martí Jiménez-Argüello^{15

32}, F Meddi¹⁹, D Meekins¹⁰, R Michaels¹⁰, M Mihovilovic³³, N Muangma⁵, C Muñoz Camacho^{8

15}, P Nadel-Turonski¹⁰, N Nuruzzaman¹³, R Paremuzyan¹⁵, A Puckett³⁴, V Punjabi³⁵, Y Qiang¹⁰, A Rakhman³, M N H Rashad¹¹, S Riordan³⁶, J Roche¹², G Russo⁷, F Sabatié¹, K Saenboonruang^{29

37}, A Saha¹⁰, B Sawatzky^{10

17}, L Selvy³⁰, A Shahinyan³⁸, S Sirca³³, P Solvignon¹⁰, M L Sperduto⁷, R Subedi³⁹, V Sulkosky⁵, C Sutera⁷, W A Tobias²⁹, G M Urciuoli⁴⁰, D Wang²⁹, B Wojtsekhowski¹⁰, H Yao¹⁷, Z Ye²⁹, L Zana³, X Zhan⁴¹, J Zhang¹⁰, B Zhao²⁷, Z Zhao²⁹, X Zheng²⁹, P Zhu²⁹; Jefferson Lab Hall A Collaboration

Affiliations

¹ Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
² Faculté des sciences de Monastir, 5000 Tunisia.
³ Syracuse University, Syracuse, New York 13244, USA.
⁴ Texas A&M University-Kingsville, Kingsville, Texas 78363, USA.
⁵ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁶ California State University, Los Angeles, Los Angeles, California 90032, USA.
⁷ INFN/Sezione di Catania, 95125 Catania, Italy.
⁸ Clermont Université, Université Blaise Pascal, CNRS/IN2P3, Laboratoire de physique corpusculaire, FR-63000 Clermont-Ferrand, France.
⁹ Florida International University, Miami, Florida 33199, USA.
¹⁰ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
¹¹ Old Dominion University, Norfolk, Virginia 23529, USA.
¹² Ohio University, Athens, Ohio 45701, USA.
¹³ Hampton University, Hampton, Virginia 23668, USA.
¹⁴ Università di Bari, 70121 Bari, Italy.
¹⁵ Institut de Physique Nucléaire CNRS-IN2P3, Orsay 91400, France.
¹⁶ Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
¹⁷ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹⁸ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹⁹ INFN/Sezione Sanità, 00161 Roma, Italy.
²⁰ Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
²¹ North Carolina Central University, Durham, North Carolina 27701, USA.
²² Longwood University, Farmville, Virginia 23909, USA.
²³ The Catholic University of America, Washington, DC 20064, USA.
²⁴ Duke University, Durham, North Carolina 27708, USA.
²⁵ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
²⁶ Seoul National University, Seoul 151-747, South Korea.
²⁷ College of William and Mary, Williamsburg, Virginia 23187, USA.
²⁸ Tel Aviv University, Tel Aviv 69978, Israel.
²⁹ University of Virginia, Charlottesville, Virginia 22904, USA.
³⁰ Kent State University, Kent, Ohio 44242, USA.
³¹ University of Massachusetts, Amherst, Massachusetts 01003, USA.
³² Facultad de Física, Universidad de Valencia, Valencia 46071, Spain.
³³ University of Ljubljana, 1000 Ljubljana, Slovenia.
³⁴ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
³⁵ Norfolk State University, Norfolk, Virginia 23529, USA.
³⁶ Stony Brook University, Stony Brook, New York 11794, USA.
³⁷ Kasetsart University, Chatuchak, Bangkok, 10900, Thailand.
³⁸ Yerevan Physics Institute, Yerevan 375036, Armenia.
³⁹ George Washington University, Washington, DC 20052, USA.
⁴⁰ INFN/Sezione di Roma, 00185 Roma, Italy.
⁴¹ Argonne National Laboratory, Lemont, Illinois 60439, USA.

PMID: 28059549
DOI: 10.1103/PhysRevLett.117.262001

Rosenbluth Separation of the π^{0} Electroproduction Cross Section

M Defurne et al. Phys Rev Lett. 2016.

. 2016 Dec 23;117(26):262001.

doi: 10.1103/PhysRevLett.117.262001. Epub 2016 Dec 23.

Authors

Affiliations

¹ Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
² Faculté des sciences de Monastir, 5000 Tunisia.
³ Syracuse University, Syracuse, New York 13244, USA.
⁴ Texas A&M University-Kingsville, Kingsville, Texas 78363, USA.
⁵ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁶ California State University, Los Angeles, Los Angeles, California 90032, USA.
⁷ INFN/Sezione di Catania, 95125 Catania, Italy.
⁸ Clermont Université, Université Blaise Pascal, CNRS/IN2P3, Laboratoire de physique corpusculaire, FR-63000 Clermont-Ferrand, France.
⁹ Florida International University, Miami, Florida 33199, USA.
¹⁰ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
¹¹ Old Dominion University, Norfolk, Virginia 23529, USA.
¹² Ohio University, Athens, Ohio 45701, USA.
¹³ Hampton University, Hampton, Virginia 23668, USA.
¹⁴ Università di Bari, 70121 Bari, Italy.
¹⁵ Institut de Physique Nucléaire CNRS-IN2P3, Orsay 91400, France.
¹⁶ Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
¹⁷ Temple University, Philadelphia, Pennsylvania 19122, USA.
¹⁸ Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
¹⁹ INFN/Sezione Sanità, 00161 Roma, Italy.
²⁰ Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
²¹ North Carolina Central University, Durham, North Carolina 27701, USA.
²² Longwood University, Farmville, Virginia 23909, USA.
²³ The Catholic University of America, Washington, DC 20064, USA.
²⁴ Duke University, Durham, North Carolina 27708, USA.
²⁵ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
²⁶ Seoul National University, Seoul 151-747, South Korea.
²⁷ College of William and Mary, Williamsburg, Virginia 23187, USA.
²⁸ Tel Aviv University, Tel Aviv 69978, Israel.
²⁹ University of Virginia, Charlottesville, Virginia 22904, USA.
³⁰ Kent State University, Kent, Ohio 44242, USA.
³¹ University of Massachusetts, Amherst, Massachusetts 01003, USA.
³² Facultad de Física, Universidad de Valencia, Valencia 46071, Spain.
³³ University of Ljubljana, 1000 Ljubljana, Slovenia.
³⁴ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
³⁵ Norfolk State University, Norfolk, Virginia 23529, USA.
³⁶ Stony Brook University, Stony Brook, New York 11794, USA.
³⁷ Kasetsart University, Chatuchak, Bangkok, 10900, Thailand.
³⁸ Yerevan Physics Institute, Yerevan 375036, Armenia.
³⁹ George Washington University, Washington, DC 20052, USA.
⁴⁰ INFN/Sezione di Roma, 00185 Roma, Italy.
⁴¹ Argonne National Laboratory, Lemont, Illinois 60439, USA.

PMID: 28059549
DOI: 10.1103/PhysRevLett.117.262001

Abstract

We present deeply virtual π^{0} electroproduction cross-section measurements at x_{B}=0.36 and three different Q^{2} values ranging from 1.5 to 2 GeV^{2}, obtained from Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component and, thus, is far from the asymptotic limit predicted by perturbative quantum chromodynamics. Nonetheless, an indication of a nonzero longitudinal contribution is provided by the measured interference term σ_{LT}. Results are compared with several models based on the leading-twist approach of generalized parton distributions (GPDs). In particular, a fair agreement is obtained with models in which the scattering amplitude includes convolution terms of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. This experiment, together with previous extensive unseparated measurements, provides strong support to the exciting idea that transversity GPDs can be accessed via neutral pion electroproduction in the high-Q^{2} regime.

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Rosenbluth Separation of the π^{0} Electroproduction Cross Section

Affiliations

Rosenbluth Separation of the π^{0} Electroproduction Cross Section

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources

Other Literature Sources

Research Materials

Miscellaneous