FIZIKA B 13 (2004)  2, 553-564

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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 gpr0pp+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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