Luminosity Monitoring For Prim Ex Dan Dale Prim

Conclusion 1: What we have now Luminosity Error Budget ____________________ effect error(%) Uncorrected leakage

Beam leakage from other Halls If not corrected: ~1. 4% effect on 1/3 of

TAC Statistics • +- 0. 5% per T channel • If we combine all

Dependence of Tagging Ratios on Beam Intensity

Effect of Collimator Position on Tagging Ratios

Effect of Beam Missteering on Tagging Ratios Run 4338: centered Run 4340: 5 mm

Short Term Stability of Tagging Ratios – Consecutive Runs

Dependence of Relative Tagging Ratios on Rate

Conclusion 2: What we can ultimately do. Luminosity Error Budget ____________________ effect error(%) Corrected

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Luminosity Monitoring For Prim. Ex Dan Dale Prim. Ex Collaboration Meeting December 16, 2006

Conclusion 1: What we have now Luminosity Error Budget ____________________ effect error(%) Uncorrected leakage current 0. 5 (1. 4%/3) TAC statistics 0. 2 (0. 5 per T channel) Electron counting systematics 0. 8 (clock versus out of time) Electron counting statistics negligible TAC reproducibility 0. 4 HYCAL collimation of TAC 0. 25 (worst case, no photon collimator) Beam position/collimator effect 0. 2 Absorption in TAC runs not yet evaluated ________________________________ 1. 1%

Beam leakage from other Halls If not corrected: ~1. 4% effect on 1/3 of runs = 0. 5% error

TAC Statistics • +- 0. 5% per T channel • If we combine all 0. 2% Electron Counting Systematics 0. 8% discrepancy between CLOCK and OUT-OF-TIME methods Electron Counting Statistics Negligible.

Dependence of Tagging Ratios on Beam Intensity

Effect of Photon Beam Collimator

Effect of Collimator Position on Tagging Ratios

Effect of Beam Missteering on Tagging Ratios Run 4338: centered Run 4340: 5 mm up Run 4341: 5. 7 mm X 0. 22 mm Y Run 4342: 8. 62 X Run 4343: 6 mm X

Short Term Stability of Tagging Ratios – Consecutive Runs

Long Term Stability of Tagging Ratios

Dependence of Relative Tagging Ratios on Rate

Conclusion 2: What we can ultimately do. Luminosity Error Budget ____________________ effect error(%) Corrected leakage current 0. 3 (1. 4%/3/2) TAC statistics 0. 2 (0. 5 per T channel) electron counting systematics 0. 8 (clock versus out of time) Electron counting statistics negligible TAC reproducibility 0. 4 HYCAL collimation of TAC 0. 25 (worst case, no photon collimator) Beam position/collimator effect 0. 2 Absorption in TAC runs not yet evaluated ________________________________ 1. 0%