Measurement of target and double-spin asymmetries for the reaction in the nucleon resonance region at low
We report measurements of target- and double-spin asymmetries for the exclusive channel $$\vec e\vec p\to e\pi^+ (n)$$ in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH$$_3$$ target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3 and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low $Q^2$ range from $0.0065$ to $0.35$ (GeV$/c$$)$$^2$. The $Q^2$ access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as $$6^\circ$$. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.
- Research Organization:
- George Washington Univ., Washington, DC (United States); Mississippi State Univ., Mississippi State, MS (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- CLAS Collaboration
- Grant/Contract Number:
- SC0016583; FG02-07ER41528; AC05-06OR23177; ST/L005719/1; GR/T08708/01
- OSTI ID:
- 1439598
- Alternate ID(s):
- OSTI ID: 1329346; OSTI ID: 1329530
- Report Number(s):
- JLAB-PHY-16-2307; DOE/OR/-23177-3890; arXiv:1607.03924; PRVCAN; TRN: US1900628
- Journal Information:
- Physical Review C, Vol. 94, Issue 4; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
The spin structure of the nucleon
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journal | June 2019 |
The spin structure of the nucleon
|
journal | January 2005 |
The spin structure of the nucleon
|
journal | January 1994 |
The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course
|
conference | April 2017 |
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