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Title: First results on nucleon resonance photocouplings from the γp → π+π−p reaction

Journal Article · · Physics Letters B
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We report the first experimental measurements of the nine 1-fold differential cross sections for the $$\gamma p \to \pi^+\pi^-p$$ reaction, obtained with the CLAS detector at Jefferson Lab. The measurements cover the invariant mass range of the final state hadrons from 1.6 GeV < 2.0 GeV. For the first time the photocouplings of all prominent nucleon resonances in this mass range have been extracted from this exclusive channel. Photoproduction of two charged pions is of particular importance for the evaluation of the photocouplings for the Δ(1620) 1/2-, Δ(1700) 3/2-, N(1720)3/2+, and Δ(1905)5/2+ resonances, which have dominant decays into the ππN final states rather than the more extensively studied single meson decay channels.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Instituto Nazionale di Fisica Nucleare (INFN); Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Centre National de la Recherche Scientifique (CNRS); Commissariat a l’Energie Atomique (CEA); National Science Foundation (NSF); Scottish Universities Physics Alliance (SUPA); Moscow State University; Ohio University; University of South Carolina; United Kingdom Science and Technology Facilities Council; National Research Foundation of Korea (NRF)
Contributing Organization:
CLAS Collaboration
Grant/Contract Number:
AC05-06OR23177; AC02-06CH11357; SC0016583
OSTI ID:
1477522
Alternate ID(s):
OSTI ID: 1487203; OSTI ID: 1497727; OSTI ID: 1504173
Report Number(s):
JLAB-PHY-18-2734; DOE/OR/-23177-4481; arXiv:1806.01767; S0370269318307779; PII: S0370269318307779
Journal Information:
Physics Letters B, Journal Name: Physics Letters B Vol. 788 Journal Issue: C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

Cited By (1)

Spectrum of Light- and Heavy-Baryons journal April 2019

Figures / Tables (10)

Figure 1(p. 4)figure Figure 1
Figure 2(p. 4)figure Figure 2
Figure 3(p. 5)figure Figure 3
Figure 4(p. 5)figure Figure 4
Table 1(p. 5)table Table 1
Figure 5(p. 6)figure Figure 5
Figure 6(p. 6)figure Figure 6
Table 2(p. 7)table Table 2
Table 3(p. 8)table Table 3
Table 4(p. 8)table Table 4

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
baryon state
resonance photocouplings
two pion photoproduction