Physics Letters B (Sep 2016)
Electroexcitation of the Δ+(1232) at low momentum transfer
- A. Blomberg,
- D. Anez,
- N. Sparveris,
- A.J. Sarty,
- M. Paolone,
- S. Gilad,
- D. Higinbotham,
- Z. Ahmed,
- H. Albataineh,
- K. Allada,
- B. Anderson,
- K. Aniol,
- J. Annand,
- J. Arrington,
- T. Averett,
- H. Baghdasaryan,
- X. Bai,
- A. Beck,
- S. Beck,
- V. Bellini,
- F. Benmokhtar,
- W. Boeglin,
- C.M. Camacho,
- A. Camsonne,
- C. Chen,
- J.P. Chen,
- K. Chirapatpimol,
- E. Cisbani,
- M. Dalton,
- W. Deconinck,
- M. Defurne,
- R. De Leo,
- D. Flay,
- N. Fomin,
- M. Friend,
- S. Frullani,
- E. Fuchey,
- F. Garibaldi,
- R. Gilman,
- C. Gu,
- D. Hamilton,
- C. Hanretty,
- O. Hansen,
- M. Hashemi Shabestari,
- O. Hen,
- T. Holmstrom,
- M. Huang,
- S. Iqbal,
- N. Kalantarians,
- H. Kang,
- A. Kelleher,
- M. Khandaker,
- I. Korover,
- J. Leckey,
- J. LeRose,
- R. Lindgren,
- E. Long,
- J. Mammei,
- D.J. Margaziotis,
- A. Martí Jimenez-Arguello,
- D. Meekins,
- Z.E. Meziani,
- M. Mihovilovic,
- N. Muangma,
- B. Norum,
- Nuruzzaman,
- K. Pan,
- S. Phillips,
- E. Piasetzky,
- A. Polychronopoulou,
- I. Pomerantz,
- M. Posik,
- V. Punjabi,
- X. Qian,
- A. Rakhman,
- P.E. Reimer,
- S. Riordan,
- G. Ron,
- A. Saha,
- E. Schulte,
- L. Selvy,
- R. Shneor,
- S. Sirca,
- J. Sjoegren,
- R. Subedi,
- V. Sulkosky,
- W. Tireman,
- D. Wang,
- J. Watson,
- B. Wojtsekhowski,
- W. Yan,
- I. Yaron,
- Z. Ye,
- X. Zhan,
- J. Zhang,
- Y. Zhang,
- B. Zhao,
- Z. Zhao,
- X. Zheng,
- P. Zhu
Affiliations
- A. Blomberg
- Temple University, Philadelphia, PA 19122, USA
- D. Anez
- Dalhousie University, Halifax, Nova Scotia, Canada
- N. Sparveris
- Temple University, Philadelphia, PA 19122, USA
- A.J. Sarty
- Saint Mary's University, Halifax, Nova Scotia, Canada
- M. Paolone
- Temple University, Philadelphia, PA 19122, USA
- S. Gilad
- Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- D. Higinbotham
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- Z. Ahmed
- Syracuse University, Syracuse, NY 13210, USA
- H. Albataineh
- Old Dominion University, Norfolk, VA 23529, USA
- K. Allada
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- B. Anderson
- Kent State University, Kent, OH 44242, USA
- K. Aniol
- California State University, Los Angeles, Los Angeles, CA 90032, USA
- J. Annand
- University of Glasgow, Glasgow G12 8QQ, Scotland, UK
- J. Arrington
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- T. Averett
- The College of William and Mary, Williamsburg, VA 23187, USA
- H. Baghdasaryan
- University of Virginia, Charlottesville, VA 22904, USA
- X. Bai
- China Institute of Atomic Energy, Beijing, China
- A. Beck
- Nuclear Research Center-Negev, Beer-Sheva, Israel
- S. Beck
- Nuclear Research Center-Negev, Beer-Sheva, Israel
- V. Bellini
- Universita di Catania, Catania, Italy
- F. Benmokhtar
- Duquesne University, Pittsburgh, PA 15282, USA
- W. Boeglin
- Florida International University, Miami, FL 33199, USA
- C.M. Camacho
- Institut de Physique Nucleaire, Orsay, France
- A. Camsonne
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- C. Chen
- Hampton University, Hampton, VA 23668, USA
- J.P. Chen
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- K. Chirapatpimol
- University of Virginia, Charlottesville, VA 22904, USA
- E. Cisbani
- INFN, Sezione di Roma, I-00161 Rome, Italy
- M. Dalton
- University of Virginia, Charlottesville, VA 22904, USA
- W. Deconinck
- The College of William and Mary, Williamsburg, VA 23187, USA
- M. Defurne
- École Centrale Paris, Châtenay-Malabry, France
- R. De Leo
- Universite di Bari, Bari, Italy
- D. Flay
- Temple University, Philadelphia, PA 19122, USA
- N. Fomin
- University of Tennessee, Knoxville, TN 37996, USA
- M. Friend
- Carnegie Mellon University, Pittsburgh, PA 15213, USA
- S. Frullani
- INFN, Sezione di Roma, I-00161 Rome, Italy
- E. Fuchey
- Temple University, Philadelphia, PA 19122, USA
- F. Garibaldi
- INFN, Sezione di Roma, I-00161 Rome, Italy
- R. Gilman
- Rutgers University, New Brunswick, NJ 08855, USA
- C. Gu
- University of Virginia, Charlottesville, VA 22904, USA
- D. Hamilton
- University of Glasgow, Glasgow G12 8QQ, Scotland, UK
- C. Hanretty
- University of Virginia, Charlottesville, VA 22904, USA
- O. Hansen
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- M. Hashemi Shabestari
- University of Virginia, Charlottesville, VA 22904, USA
- O. Hen
- Tel Aviv University, Tel Aviv 69978, Israel
- T. Holmstrom
- Longwood University, Farmville, VA 23909, USA
- M. Huang
- Duke University, Durham, NC 27708, USA
- S. Iqbal
- California State University, Los Angeles, Los Angeles, CA 90032, USA
- N. Kalantarians
- Unversity of Houston, Houston, TX 77030, USA
- H. Kang
- Seoul National University, Seoul, Republic of Korea
- A. Kelleher
- MIT Bates Linear Accelerator, Middleton, MA 01949, USA
- M. Khandaker
- Indiana University, Bloomington, IN 47405, USA
- I. Korover
- Tel Aviv University, Tel Aviv 69978, Israel
- J. Leckey
- Indiana University, Bloomington, IN 47405, USA
- J. LeRose
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- R. Lindgren
- University of Virginia, Charlottesville, VA 22904, USA
- E. Long
- Kent State University, Kent, OH 44242, USA
- J. Mammei
- Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
- D.J. Margaziotis
- California State University, Los Angeles, Los Angeles, CA 90032, USA
- A. Martí Jimenez-Arguello
- Laboratoire de Physique Corpusculaire de Clermont-Ferrand, Aubière Cedex, France
- D. Meekins
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- Z.E. Meziani
- Temple University, Philadelphia, PA 19122, USA
- M. Mihovilovic
- Jožef Stefan Institute, Ljubljana, Slovenia
- N. Muangma
- MIT Bates Linear Accelerator, Middleton, MA 01949, USA
- B. Norum
- University of Virginia, Charlottesville, VA 22904, USA
- Nuruzzaman
- Mississippi State University, Mississippi State, MS 39762, USA
- K. Pan
- Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- S. Phillips
- University of New Hampshire, Durham, NH 03824, USA
- E. Piasetzky
- Tel Aviv University, Tel Aviv 69978, Israel
- A. Polychronopoulou
- Temple University, Philadelphia, PA 19122, USA
- I. Pomerantz
- Tel Aviv University, Tel Aviv 69978, Israel
- M. Posik
- Temple University, Philadelphia, PA 19122, USA
- V. Punjabi
- Norfolk State University, Norfolk, VA 23504, USA
- X. Qian
- Duke University, Durham, NC 27708, USA
- A. Rakhman
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- P.E. Reimer
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- S. Riordan
- University of Massachusetts, Amherst, MA 01003, USA
- G. Ron
- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
- A. Saha
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- E. Schulte
- Temple University, Philadelphia, PA 19122, USA
- L. Selvy
- Kent State University, Kent, OH 44242, USA
- R. Shneor
- Tel Aviv University, Tel Aviv 69978, Israel
- S. Sirca
- University of Ljubljana, Ljubljana, Slovenia
- J. Sjoegren
- University of Glasgow, Glasgow G12 8QQ, Scotland, UK
- R. Subedi
- George Washington University, Washington, DC 20052, USA
- V. Sulkosky
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- W. Tireman
- Northern Michigan University, Marquette, MI 49855, USA
- D. Wang
- University of Virginia, Charlottesville, VA 22904, USA
- J. Watson
- Kent State University, Kent, OH 44242, USA
- B. Wojtsekhowski
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- W. Yan
- University of Science and Technology of China, Hefei 230026, People's Republic of China
- I. Yaron
- Tel Aviv University, Tel Aviv 69978, Israel
- Z. Ye
- University of Virginia, Charlottesville, VA 22904, USA
- X. Zhan
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- J. Zhang
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- Y. Zhang
- Rutgers University, New Brunswick, NJ 08855, USA
- B. Zhao
- University of Connecticut, Storrs, CT 06269, USA
- Z. Zhao
- University of Virginia, Charlottesville, VA 22904, USA
- X. Zheng
- University of Virginia, Charlottesville, VA 22904, USA
- P. Zhu
- University of Science and Technology of China, Hefei 230026, People's Republic of China
- DOI
- https://doi.org/10.1016/j.physletb.2016.06.076
- Journal volume & issue
-
Vol. 760,
no. C
pp. 267 – 272
Abstract
We report on new p(e,e′p)π∘ measurements at the Δ+(1232) resonance at the low momentum transfer region, where the mesonic cloud dynamics is predicted to be dominant and rapidly changing, offering a test bed for chiral effective field theory calculations. The new data explore the Q2 dependence of the resonant quadrupole amplitudes and for the first time indicate that the Electric and the Coulomb quadrupole amplitudes converge as Q2→0. The measurements of the Coulomb quadrupole amplitude have been extended to the lowest momentum transfer ever reached, and suggest that more than half of its magnitude is attributed to the mesonic cloud in this region. The new data disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations that include pion cloud effects, chiral effective field theory and lattice calculations. The measurements indicate that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.
Keywords
