LEPS Strangeness Physics Program




Professor Hicks is spokesperson on several experiments using the LEPS spectrometer at the SPring-8 accelerator in Japan to explore the production of strange quarks in reactions on the proton in order to better understand the structure of the nucleon and fundmental aspects of the strong nuclear force. These experiments are:

K+Lambda - Spokesperson: K.H. Hicks (Ohio) - The K+ Lambda system at u-channel kinematics
Coherent Phi - Spokesperson: W.C. Change (Academia Sinica) - Coherent Phi-meson Photoproduction
Phi - Spokesperson: T. Mibe (Osaka) - Phi-meson Photoproduction near threshold
K+Lambda - Spokesperson: M. Sumihama (Osaka) - The K+ Lambda cross sections at forward angles
Theta+ - Spokesperson: T. Nakano (Osaka) - Observation of a Narrow S=+1 Baryon Resonance
K+Lambda - Spokesperson: R. Zegers (Osaka) - The K+ Lambda linear beam asymmetry


Each of these experiments is described in more detail in the following sections.


K+ Lambda Photoproduction at Backward Angles

Professor Hicks is the spokesman of an experiment at LEPS/SPring-8 to measure the reaction of a few-GeV photon beam incident on a proton target to produce the K+ meson and a Lambda baryon in the final state. The decay products of the Lambda (a negative pion and a proton) are measured in the LEPS spectrometer at forward angles, corresponding to backward angles of the K+ meson. The LEPS spectrometer covers an angular range not accessible by the CLAS detector at Jefferson Lab, and hence these data are an extension of the CLAS measurements.

The results have been published in the journal Physical Review C, Volume 76 (2007). These results show that baryon exchange diagrams in the u-channel cannot explain the results alone, and that final state interactions likely play a large role at these threshold production energies. (top of page)



Coherent Phi Photoproduction from the Deutron

This result has been accepted for publication in Physics Letters B, see the arXiv.org website, reference nucl-ex/0703034. (top of page)



Phi Photoproduction from the Proton near Threshold

This result has been published in Physical Revew Letters, Volume 95 (2005). (top of page)



K+ Lambda Cross Sections at Forward Angles

This result has been published in Physical Review C, Volume 73 (2006). (top of page)



Observation of a Narrow S=+1 Baryon Resonance

This result was published in Physical Review Letters, Volume 91 (2003). (top of page)



K+ Lambda Linear Beam Asymmetries

This result was published in Physical Review Letters, Volume 91 (2003). (top of page)



Last modified: November 12, 2007
Kenneth Hicks