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Semi-Inclusive Deep-Inelastic Scattering and Kaons from CLAS6



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Semi Inclusive Deep Inelastic Scattering and Kaons from CLAS6 K Griffioen College of William Mary griff physics wm edu Workshop on Probing Strangeness in Hard Processes Laboratori Nazionale di Frascati Frascati Italy 18 October 2010 18 October 2010 Frascati Workshop eg1 dvcs with CLAS eg1 dvcs ran for 120 days in 2009 on NH3 ND3 and C targets We have an order of magnitude more DIS data than in eg1 The Inner Calorimeter greatly increased 0 detection 18 October 2010 Frascati Workshop 2 NH3 Longitudinally Polarized Target Dynamic nuclear polarization of NH3 and ND3 Polarizations of 70 80 for p and 25 40 for d Luminosity 1035 cm 2s 1 18 October 2010 Frascati Workshop 3 NH3 Double Spin Asymmetries Inclusive Asymmetry Part B Proton polarization red between 70 and 90 Inclusive asymmetries integrated over all kinematic variables blue are proportional to PbPt Inclusive Asymmetry Part C C NH3 Asymmetry Target Polarization ND3 Deuteron polarization red between 25 and 40 Inclusive asymmetries integrated over all kinematic variables blue are proportional to PbPt C 18 October 2010 Asymmetry Target Polarization Frascati Workshop 4 Inner Calorimeter The IC measures angles below 18 22o depending on the distance from the target Most of eg1 dvcs had IC coverage below 18o 18 October 2010 Frascati Workshop 5 Experimental Details Run Period Part A NH3 C Beam Energy Part B NH3 C 5 954 33506 67 5 cm Part C ND3 C 5 752 14659 67 5 cm 18 October 2010 5 887 4 730 files 2min Nominal 0 4M trig IC location 15490 57 5 cm Frascati Workshop 6 SIDIS Kinematic Coverage in eg1 dvcs 0 x z pT Because the IC cuts off electrons below 18O and the target above 45O we measure DIS in a small stripe in the x Q2 plane There is nearly full coverage in z and pT Kaon kinematics are similar The pT distributions for and are different from 0 because most 0 s come from the IC small angles whereas the charged pions are obscured by the IC Q2 18 October 2010 Frascati Workshop 7 Kaon Identification in eg1b p p t Positive



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