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

Blomberg, A.; Anez, D.; Sparveris, N.; Sarty, A. J.; Paolone, M.; Gilad, S.; Higinbotham, D.; Ahmed, Z.; Albataineh, H.; Allada, K.; Anderson, B.; Aniol, K.; Annand, J.; Arrington, J.; Averett, T.; Baghdasaryan, H.; Bai, X.; Beck, A.; Beck, S.; Bellini, V.; Benmokhtar, F.; Boeglin, W.; Camacho, C. M.; Camsonne, A.; Chen, C.; Chen, J. P.; Chirapatpimol, K.; Cisbani, E.; Dalton, M.; Deconinck, W.; Defurne, M.; De Leo, R.; Flay, D.; Fomin, N.; Friend, M.; Frullani, S.; Fuchey, E.; Garibaldi, F.; Gilman, R.; Gu, C.; Hamilton, D.; Hanretty, C.; Hansen, O.; Hashemi Shabestari, M.; Hen, O.; Holmstrom, T.; Huang, M.; Iqbal, S.; Kalantarians, N.; Kang, H.; Kelleher, A.; Khandaker, M.; Korover, I.; Leckey, J.; LeRose, J.; Lindgren, R.; Long, E.; Mammei, J.; Margaziotis, D. J.; Martí Jimenez-Arguello, A.; Meekins, D.; Meziani, Z. E.; Mihovilovic, M.; Muangma, N.; Norum, B.; Nuruzzaman, .; Pan, K.; Phillips, S.; Piasetzky, E.; Polychronopoulou, A.; Pomerantz, I.; Posik, M.; Punjabi, V.; Qian, X.; Rakhman, A.; Reimer, P. E.; Riordan, S.; Ron, G.; Saha, A.; Schulte, E.; Selvy, L.; Shneor, R.; Sirca, S.; Sjoegren, J.; Subedi, R.; Sulkosky, V.; Tireman, W.; Wang, D.; Watson, J.; Wojtsekhowski, B.; Yan, W.; Yaron, I.; Ye, Z.; Zhan, X.; Zhang, J.; Zhang, Y.; Zhao, B.; Zhao, Z.; Zheng, X.; Zhu, P.

doi:10.1016/j.physletb.2016.06.076

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

Journal Article · Tue Jul 05 00:00:00 EDT 2016 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2016.06.076· OSTI ID:1263485

Blomberg, A. ^[1]; Anez, D. ^[2]; Sparveris, N. ^[1]; Sarty, A. J. ^[3]; Paolone, M. ^[1]; Gilad, S. ^[4]; Higinbotham, D. ^[5]; Ahmed, Z. ^[6]; Albataineh, H. ^[7]; Allada, K. ^[5]; Anderson, B. ^[8]; Aniol, K. ^[9]; Annand, J. ^[10]; Arrington, J. ^[11]; Averett, T. ^[12]; Baghdasaryan, H. ^[13]; Bai, X. ^[14]; Beck, A. ^[15]; Beck, S. ^[15]; Bellini, V. ^[16] more »

Temple Univ., Philadelphia, PA United States)
Saint Mary's University, Halifax, NS (Canada)
Dalhousie University, Halifax, NS (Canada); Saint Mary's University, Halifax, NS (Canada)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Syracuse Univ., NY (United States)
Old Dominion Univ., Norfolk, VA (United States)
Kent State Univ., Kent, OH (United States)
California State University, Los Angeles, CA (United States)
Univ. of Glasgow, Scotland (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
College of William and Mary, Williamsburg, VA (United States)
Univ. of Virginia, Charlottesville, VA (United States)
China Inst. of Atomic Energy, Beijing (China)
Nuclear Research Center-Negev, Beer-Sheva (Israel)
Univ. di Catania, Catania (Italy)
Duquesne Univ., Pittsburgh, PA (United States)
Florida International Univ., Miami, FL (United States)
Inst. de Physique Nucleaire (IPN), Orsay (France)
Hampton Univ., Hampton, VA (United States)
Univ. of Virginia, Charlottesville, VA (United States); Chiang Mai Univ. (Thailand)
Istituto Nazionale di Fisica Nucleare (INFN), Rome (Italy)
Ecole Centrale Paris (CEA) (France)
Univ. of Bari (Italy)
Univ. of Tennessee, Knoxville, TN (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Istituto Nazionale di Fisica Nucleare (INFN), Rome (Italy); Longwood Univ., Farmville, VA (United States)
Rutgers Univ., New Brunswick, NJ (United States)
Univ. of Virginia, Charlottesville, VA (United States); Florida State Univ., Tallahassee, FL (United States)
Tel Aviv Univ., Tel Aviv (Israel)
Longwood Univ., Farmville, VA (United States)
Duke Univ., Durham, NC (United States)
Univ. of Houston, Houston, TX (United States)
Seoul National Univ. (Korea, Republic of)
MIT Bates Linear Accelerator, Middleton, MA (United States)
Indiana Univ., Bloomington, IN (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Lab. de Physique Corpusculaire de Clermont-Ferrand, Aubiere (France)
Jozef Stefan Inst., Ljubljana, Slovenia
Mississippi State Univ., Mississippi State, MS (United States)
Univ. of New Hampshire, Durham, NH (United States)
Norfolk State Univ., Norfolk, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Univ. of Massachusetts, Amherst, MA (United States); Stony Brook Univ., NY (United States)
Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
Univ. of Ljubljana, Ljubljana (Slovenia)
George Washington Univ., Washington, DC (United States)
Northern Michigan Univ., Marquette, MI (United States)
Univ. of Science and Technology of China, Hefei (China)
Univ. of Connecticut, Storrs, CT (United States)

We report on new measurements at the 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 dependence of the resonant quadrupole amplitudes and for the first time indicate that the Electric and the Coulomb quadrupole amplitudes converge as. 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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Virginia, Charlottesville, VA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); UK Science and Technology Facilities Council

Grant/Contract Number:: AC05-06OR23177; NSF-PHY-1305536; AC02-06CH11357; SC0014325; AC02-05CH11231

OSTI ID:: 1263485

Alternate ID(s):: OSTI ID: 1339158; OSTI ID: 1417862; OSTI ID: 1830316

Report Number(s):: JLAB-PHY-16-2200; DOE/OR/-23177-3849; PII: S0370269316303367

Journal Information:: Physics Letters. B, Vol. 760, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 14 works

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