First results on nucleon resonance electroexcitation amplitudes from ep → e'π+π–p' cross sections at W = 1.4–1.7 GeV and Q2 = 2.0–5.0 GeV2
Journal Article
·
· Physical Review. C
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Thomas Jefferson National Accelerator Facility
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- University of South Carolina, Columbia, SC (United States)
- Tübingen University (Germany)
- Moscow State University (Russia)
- University of Connecticut, Storrs, CT (United States)
The electroexcitation amplitudes or $$\gamma_vpN^*$$ electrocouplings of the $N(1440)1/2^+$, $N(1520)3/2^-$, and $$\Delta(1600)3/2^+$$ resonances were obtained for the first time from the $$ep \to e'\pi^+\pi^-p'$$ differential cross sections measured with the CLAS detector at Jefferson Lab within the range of invariant mass $$W$$ of the final state hadrons from 1.4–1.7~GeV for photon virtualities $Q^2$ from 2.0--5.0~GeV$^2$. A good description of the nine independent one-fold differential $$\gamma_v p\to \pi^+\pi^-p'$$ cross sections achieved within the data-driven Jefferson Lab-Moscow State University (JM) meson-baryon reaction model in each bin of ($$W$$,$Q^2$) allows for separation of the resonant and non-resonant contributions. The electrocouplings were determined in the fits of the $$\pi^+\pi^-p$$ cross sections within three overlapping $$W$$ intervals with a substantial contribution from each of the three resonances listed above. Consistent results on the electrocouplings extracted from the data in these $$W$$ intervals provide evidence for their reliable extraction. These studies extend information on the electrocouplings of the $N(1440)1/2^+$ and $N(1520)3/2^-$ available from this channel over a broader range of $Q^2$. The electrocouplings of the $$\Delta(1600)3/2^+$$, which decays preferentially into $$\pi\pi N$$ final states, have been determined for the first time. Here, the reliable extraction of the electrocouplings for these states is also supported by the description of the $$\pi^+\pi^-p$$ differential cross sections with $Q^2$-independent masses and total/partial hadronic decay widths into the $$\pi\Delta$$ and $$\rho p$$ final states.
- Research Organization:
- Accelerator Facility (TJNAF), Newport News, VA (United States); Thomas Jefferson National Accelerator Facility; Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1996745
- Alternate ID(s):
- OSTI ID: 1996966
- Report Number(s):
- DOE/OR/23177-6506; JLAB-PHY-23-3865
- Journal Information:
- Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 108; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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