Photon Asymmetries for K Production on the Deuteron

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Presentation transcript:

Photon Asymmetries for K Production on the Deuteron J Russell Johnstone University of Glasgow CLAS12 European Workshop Genova, 27th February 2009

Part of the g13 experiment. Introduction Part of the g13 experiment. Examining strangeness channels from the deuteron.

Allows clean channel and particle identification. Basic Analysis Cuts Typical analysis cuts. Allows clean channel and particle identification.

Hyperon Identification Hyperons identified by plotting MM of K+ from deuterium target vs. MM of K+ from proton target. Good hyperon separation. Hyperons extracted with elliptical cuts.

Hyperon Identification Black outline represents hyperon masses immediately after elliptical cut. Red outline after other analysis cuts. Green line indicates PDG masses.

Hyperon and Kaon Theta distributions Green outline shows K+() theta distribution. Black outline shows K+() theta distribution. Red outline shows  theta distribution. Blue lines represent cos(K+CM) binning.

Raw Photon Asymmetries Raw photon asymmetries for K+( ). Top shows 1800 ~ 1850 MeV. Bottom shows 2000 ~ 2050 MeV.

K+() Photon Asymmetry Values K+() photon asymmetry values across all energy and  bins. 28 x 50 MeV energy bins from 1050 ~ 2450 MeV. 16 x 0.1 bins in  from -0.8 ~ 0.8.

Channel and particle identification looks good. Summary Channel and particle identification looks good. Hyperon identification and separation works. Theta distributions are clean. Photon asymmetries are well defined. Expect to finish soon?

Alternative hyperon separation First black line represents neutron. Second line at Mn+77MeV (mass difference between  and 0). Cleaner separation than elliptical cuts?