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Title: Studies of $$\Lambda n$$ interaction through polarization observables for final-state interactions in exclusive $$\Lambda$$ photoproduction off the deuteron

Abstract

Theoretical studies suggest that experimental observables for hyperon production reactions can place stringent constraints on the free parameters of hyperon-nucleon potentials, which are critical for the understanding of hypernuclear matter and neutron stars. Here we present preliminary experimental results for the polarization observables S, Py, Ox, Oz, Cx, and Cz for final-state interactions (FSI) in exclusive L photoproduction off the deuteron. The observables were obtained from data collected during the E06-103 (g13) experiment with the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at Jefferson Lab. The g13 experiment ran with unpolarized deuteron target and circularly- and linearly-polarized photon beams with energies between 0.5 GeV and 2.5 GeV and collected about 51010 events with multiple charged particles in the final state. To select the reaction of interest, the K+ and the L decay products, a proton and a negative pion, were detected in the CLAS. The missing-mass technique was used to identify exclusive hyperon photoproduction events. Final-state interaction events were selected by requesting that the reconstructed neutron has a momentum larger than 200 MeV/c. The large statistics of E06-103 provided statistically meaningful FSI event samples, which allow for the extraction of one- and two-fold differential single- and double-polarization observables. Heremore » we present preliminary results for a set of six observables for photon energies between 0.9 GeV and 2.3 GeV and for several kinematic variables in the Ln center-of-mass frame. Our results are the very first estimates of polarization observables for FSI in hyperon photoproduction and will be used to constrain the free parameters of hyperon-nucleon potentials.« less

Authors:
 [1];  [1];  [2]
  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Univ. of Edinburgh, Scotland (United Kingdom)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1263532
Report Number(s):
JLAB-PHY-16-2228; DOE/OR/23177-3855
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Journal Name:
Proceedings of Science
Additional Journal Information:
Journal Volume: CD15; Conference: 8th International Workshop on Chiral Dynamics (CD15) , 29 Jun - 03 Jul 2015. Pisa, Italy
Country of Publication:
United States
Language:
English

Citation Formats

Ilieva, Yordanka, Cao, Tongtong, and Zachariou, Nicholas. Studies of $\Lambda n$ interaction through polarization observables for final-state interactions in exclusive $\Lambda$ photoproduction off the deuteron. United States: N. p., 2016. Web.
Ilieva, Yordanka, Cao, Tongtong, & Zachariou, Nicholas. Studies of $\Lambda n$ interaction through polarization observables for final-state interactions in exclusive $\Lambda$ photoproduction off the deuteron. United States.
Ilieva, Yordanka, Cao, Tongtong, and Zachariou, Nicholas. 2016. "Studies of $\Lambda n$ interaction through polarization observables for final-state interactions in exclusive $\Lambda$ photoproduction off the deuteron". United States. https://www.osti.gov/servlets/purl/1263532.
@article{osti_1263532,
title = {Studies of $\Lambda n$ interaction through polarization observables for final-state interactions in exclusive $\Lambda$ photoproduction off the deuteron},
author = {Ilieva, Yordanka and Cao, Tongtong and Zachariou, Nicholas},
abstractNote = {Theoretical studies suggest that experimental observables for hyperon production reactions can place stringent constraints on the free parameters of hyperon-nucleon potentials, which are critical for the understanding of hypernuclear matter and neutron stars. Here we present preliminary experimental results for the polarization observables S, Py, Ox, Oz, Cx, and Cz for final-state interactions (FSI) in exclusive L photoproduction off the deuteron. The observables were obtained from data collected during the E06-103 (g13) experiment with the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at Jefferson Lab. The g13 experiment ran with unpolarized deuteron target and circularly- and linearly-polarized photon beams with energies between 0.5 GeV and 2.5 GeV and collected about 51010 events with multiple charged particles in the final state. To select the reaction of interest, the K+ and the L decay products, a proton and a negative pion, were detected in the CLAS. The missing-mass technique was used to identify exclusive hyperon photoproduction events. Final-state interaction events were selected by requesting that the reconstructed neutron has a momentum larger than 200 MeV/c. The large statistics of E06-103 provided statistically meaningful FSI event samples, which allow for the extraction of one- and two-fold differential single- and double-polarization observables. Here we present preliminary results for a set of six observables for photon energies between 0.9 GeV and 2.3 GeV and for several kinematic variables in the Ln center-of-mass frame. Our results are the very first estimates of polarization observables for FSI in hyperon photoproduction and will be used to constrain the free parameters of hyperon-nucleon potentials.},
doi = {},
url = {https://www.osti.gov/biblio/1263532}, journal = {Proceedings of Science},
number = ,
volume = CD15,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}

Conference:
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