skip to main content

DOE PAGESDOE PAGES

Title: Electroexcitation of the Δ+(1232) at low momentum transfer

We report on new p$$(e,e^\prime p)\pi^\circ$$ measurements at the $$\Delta^{+}(1232)$$ resonance at the low momentum transfer region. The mesonic cloud dynamics is predicted to be dominant and rapidly changing in this kinematic region offering a test bed for chiral effective field theory calculations. The new data explore the low $Q^2$ dependence of the resonant quadrupole amplitudes while extending the measurements of the Coulomb quadrupole amplitude to the lowest momentum transfer ever reached. The results 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 reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [5] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [15] ;  [16] more »;  [17] ;  [18] ;  [19] ;  [5] ;  [20] ;  [5] ;  [21] ;  [22] ;  [13] ;  [12] ;  [23] ;  [24] ;  [1] ;  [25] ;  [26] ;  [27] ;  [1] ;  [22] ;  [28] ;  [13] ;  [10] ;  [29] ;  [5] ;  [13] ;  [30] ;  [31] ;  [32] ;  [9] ;  [33] ;  [34] ;  [35] ;  [36] ;  [30] ;  [36] ;  [5] ;  [13] ;  [8] ;  [37] ;  [9] ;  [38] ;  [5] ;  [1] ;  [39] ;  [35] ;  [13] ;  [40] ;  [4] ;  [41] ;  [30] ;  [1] ;  [30] ;  [1] ;  [42] ;  [32] ;  [43] ;  [11] ;  [44] ;  [45] ;  [5] ;  [1] ;  [8] ;  [30] ;  [46] ;  [10] ;  [47] ;  [5] ;  [48] ;  [13] ;  [8] ;  [5] ;  [49] ;  [30] ;  [13] ;  [11] ;  [5] ;  [28] ;  [50] ;  [13] ;  [13] ;  [49] « less
  1. Temple Univ., Philadelphia, PA United States)
  2. Saint Mary's University, Halifax, NS (Canada)
  3. Dalhousie University, Halifax, NS (Canada); Saint Mary's University, Halifax, NS (Canada)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  6. Syracuse Univ., NY (United States)
  7. Old Dominion Univ., Norfolk, VA (United States)
  8. Kent State Univ., Kent, OH (United States)
  9. California State University, Los Angeles, CA (United States)
  10. Univ. of Glasgow, Scotland (United Kingdom)
  11. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  12. College of William and Mary, Williamsburg, VA (United States)
  13. Univ. of Virginia, Charlottesville, VA (United States)
  14. China Inst. of Atomic Energy, Beijing (China)
  15. Nuclear Research Center-Negev, Beer-Sheva (Israel)
  16. Univ. di Catania, Catania (Italy)
  17. Duquesne Univ., Pittsburgh, PA (United States)
  18. Florida International Univ., Miami, FL (United States)
  19. Inst. de Physique Nucleaire (IPN), Orsay (France)
  20. Hampton Univ., Hampton, VA (United States)
  21. Univ. of Virginia, Charlottesville, VA (United States); Chiang Mai Univ. (Thailand)
  22. Istituto Nazionale di Fisica Nucleare (INFN), Rome (Italy)
  23. Ecole Centrale Paris (CEA) (France)
  24. Univ. of Bari (Italy)
  25. Univ. of Tennessee, Knoxville, TN (United States)
  26. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  27. Istituto Nazionale di Fisica Nucleare (INFN), Rome (Italy); Longwood Univ., Farmville, VA (United States)
  28. Rutgers Univ., New Brunswick, NJ (United States)
  29. Univ. of Virginia, Charlottesville, VA (United States); Florida State Univ., Tallahassee, FL (United States)
  30. Tel Aviv Univ., Tel Aviv (Israel)
  31. Longwood Univ., Farmville, VA (United States)
  32. Duke Univ., Durham, NC (United States)
  33. Univ. of Houston, Houston, TX (United States)
  34. Seoul National Univ. (Korea, Republic of)
  35. MIT Bates Linear Accelerator, Middleton, MA (United States)
  36. Indiana Univ., Bloomington, IN (United States)
  37. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  38. Lab. de Physique Corpusculaire de Clermont-Ferrand, Aubiere (France)
  39. Jozef Stefan Inst., Ljubljana, Slovenia
  40. Mississippi State Univ., Mississippi State, MS (United States)
  41. Univ. of New Hampshire, Durham, NH (United States)
  42. Norfolk State Univ., Norfolk, VA (United States)
  43. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
  44. Univ. of Massachusetts, Amherst, MA (United States); Stony Brook Univ., NY (United States)
  45. Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
  46. Univ. of Ljubljana, Ljubljana (Slovenia)
  47. George Washington Univ., Washington, DC (United States)
  48. Northern Michigan Univ., Marquette, MI (United States)
  49. Univ. of Science and Technology of China, Hefei (China)
  50. Univ. of Connecticut, Storrs, CT (United States)
Publication Date:
OSTI Identifier:
1263485
Report Number(s):
JLAB-PHY--16-2200; DOE/OR/--23177-3849
Journal ID: ISSN 0370-2693; PII: S0370269316303367
Grant/Contract Number:
AC05-06OR23177; NSF-PHY-1305536
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); UK Science and Technology Facilities Council
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS CMR; Pion electroproduction; Nucleon deformation