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Title: Differential cross sections and recoil polarizations for the reaction {gamma}p{yields}K{sup +{Sigma}0}

Journal Article · · Physical Review. C, Nuclear Physics
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  1. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
  2. Old Dominion University, Norfolk, Virginia 23529 (United States)
  3. INFN, Laboratori Nazionali di Frascati, 00044 Frascati (Italy)

High-statistics measurements of differential cross sections and recoil polarizations for the reaction {gamma}p{yields}K{sup +{Sigma}0} have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ({radical}(s)) from 1.69 to 2.84 GeV, with an extensive coverage in the K{sup +} production angle. Independent measurements were made using the K{sup +}p{pi}{sup -}({gamma}) and K{sup +}p({pi}{sup -},{gamma}) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR, and LEPS results, while offering better statistical precision and a 300-MeV increase in {radical}(s) coverage. Above {radical}(s){approx_equal}2.5 GeV, t- and u-channel Regge scaling behavior can be seen at forward and backward angles, respectively. Our recoil polarization (P{sub {Sigma}}) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles, we find that P{sub {Sigma}}is of the same order of magnitude but opposite sign as P{sub {Lambda},} in agreement with the static SU(6) quark model prediction of P{sub {Sigma}{approx_equal}-}P{sub {Lambda}.} This expectation is violated in some mid- and backward-angle kinematic regimes, where P{sub {Sigma}}and P{sub {Lambda}}are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial-wave analyses being performed to search for missing baryon resonances.

OSTI ID:
21419458
Journal Information:
Physical Review. C, Nuclear Physics, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevC.82.025202; (c) 2010 The American Physical Society; ISSN 0556-2813
Country of Publication:
United States
Language:
English

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Cited By (6)

First Results from the BGO–OD Experiment at ELSA journal August 2018
Progress towards understanding baryon resonances journal June 2013
Partial wave analysis for K Σ photoproduction on the nucleon valid from threshold up to W = 2.8 GeV journal September 2019
Photoproduction of the f 1 ( 1285 ) meson journal June 2016
Properties of baryon resonances from a multichannel partial wave analysis journal February 2012
Strangeness in nuclear physics text January 2016


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