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FIZIKA B 13 (2004) 2, 553-564
 
VECTOR MESON AND ASSOCIATED STRANGENESS PRODUCTION USING A LINEARLY
POLARISED PHOTON BEAM AT JEFFERSON LAB
C. GORDONa, J. MELONEa, P. COLEb, J.
KELLIE, F. KLEIN, K. LIVINGSTON, J. MUELLER, J. C. SANABRIA and D. TEDESCHI
for the CLAS collaboration
aThe University of Glasgow, Glasgow G12 8QQ, Scotland
bJefferson Lab, Newport News, VA 23606, USA
E-mail addresses: c.gordon@physics.gla.ac.uk
, j.melone@physics.gla.ac.uk , cole@jlab.org
Received 3 September 2003;
Accepted 26 April 2004
Online 22 November 2004
The set of experiments forming the g8a run took place in the summer of 2001 in Hall B
of Jefferson Lab. The g8a run was the commissioning experiment for the linearly polarised
photon beam at CLAS. The aim of these experiments is to improve the understanding of the
underlying symmetry of the quark degrees of freedom in the nucleon, the nature of the
parity exchange between the incident photon and the target nucleon, and the mechanism of
associated strangeness production in electromagnetic reactions. A beam of tagged and
collimated linearly polarised photons (energy range 1.8-2.2 GeV)
in conjunction with the large solid angle coverage of CLAS make possible the extraction of
the differential cross-sections and polarisation observables for the photoproduction of
vector mesons and kaons. The reaction channels gp®r0p®p+p-p and gp® K+L0®
K+p-p are under investigation to search for possibly missing nucleon
resonances. An overview of the experiment and preliminary results on the measurement of
the photon asymmetries of the aforementioned reactions are presented.
PACS numbers: 13.60.-r,13.60.Le
UDC 539.12
Keywords: polarised photon beam at CLAS, nucleon quark degrees of freedom, parity
exchange, strangeness production
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