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E Analysis Update for the (e, e’K + ) spectroscopy exp. done in 2005 Yuncheng Han (Hampton University) for HKS-HES Collaboration Jan. 13, Hall C User Meeting

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Outline Previous analysis result Motivation of the forward optics tune Initial optics / designed optics Focal plane & Sieve Slit pattern w/ new optics Missing mass spectrum of CH 2 data w/ new optics Summary

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Overview of the E Experiment Setups

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Previous analysis result coincidence time S/A 2.5s better MM from CH2 S/A 6s better The HKS Spectrometer and ‘tilt method’ worked greatly!!!!

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s-p shell states 1~2 MeV wider but p-d shell states ~1 MeV narrower than expected NEW PHYSICS ? Review of analysis method Initial optics Mathematical optimum including calibration Result 1 st medium-heavy Λ A spectrum w/ s-, p-, d-shell state peaks 400 keV (FWHM) 470 keV (FWHM) Consistent w/ Hall A published data and much better resolution 1 st time w/ sufficient statistics B Λ and feature confirmed by E Paper drafted: n-halo state, CSB

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Focal Plane X-Xp Focal Plane X-Y Sieve Slit Red: Experimental Data Blue: Simulation w/ Initial Optics

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Focal Plane Data W/ Initial Optics - X vs Y w/ svx

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Red: Experimental Data Blue: Simulation w/ Initial Optics Focal Plane Data W/ Initial Optics - X vs Y w/ svy

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Design: 780A, 1.546T Exp: A, 8.5% up, Excitation curve Splitter magnetic field was fully saturated, The uniform region shrank sharply, The fringe field of splitter effected the magnetic field of Q1, Q2 and ENGE magnet Symmetric of the optics disappeared ENGE Splitter

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Designed Splitter Magnetic Field

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Y_Q cm Splitter: (x-8) – (x-12)/5, x<0; (x+5)+(11-X)/5, x>0 Magnetic map offset Y_Q1 magnetic map scale for Bx Scale of splitter B x is 1.06 Scale of B x for Q1 Scale of B x for Q2 X (cm)

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HKS magnetic map scale for By X (cm) r(m) Splitter Q2 Q1 Dipole

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Sieve Slit Data W/ New Optics Red: Experimental Data Blue: Simulation w/ New Optics Focal Plane X-Xp Xp (rad) X (cm)

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Red: Experimental Data Blue: Simulation w/ New Optics Focal Plane Data W/ Initial Optics – X vs Y w/ svy

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Red: Experimental Data Blue: Simulation w/ New Optics Focal Plane Data W/ New Optics – X vs Y w/ svx

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Comparing MM Spectrum W/ Seva’s Analysis Λ#746 Λ#827

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Summary E analysis update status was reported: Λ 12 B confirmed Hall A published data w/ better resolution Λ 7 He was observed with enough statistics 1 st time, paper was drafted Λ 28 Al was the 1 st medium-heavy hyper nuclear spectrum with s-, p-, d- shell states indentified individually Analysis procedure of E was reviewed, and the mathematical optimum method is powerful Better initial optics of HKS is obtained, and about 10% more Lambda event were obtained The residual of HKS optics is being tune now The optics of Enge side will be studied soon

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Emax Y X Dipole Magnetic Field Emin Y X Dipole Magnetic Field EmaxEmin X Y Q1 Magnetic Field EmaxEmin X Y Q2 Magnetic Field EmaxEmin

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Sieve Slit using in E01-011

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