HMS Luminosity Scan Ryan Ambrose University of Regina April 26, - PowerPoint PPT Presentation

HMS Luminosity Scan Ryan Ambrose University of Regina April 26, 2018 1 / 8

Procedure Using the TSelector framework, I applied several cuts to the data: ◮ | β − 1 . 0 | < 0 . 2 ◮ χ 2 /N < 25 . 0 ◮ E Cal,Norm > 0 . 8 ◮ | δ | < 8 . 0 ◮ | θ | < 0 . 080 ◮ | φ | < 0 . 035 ◮ | BCM17 − Current | < 0 . 1 ∗ Current To get the total number of good events. Procedure to get BCM17 information is outlined at https://hallcweb.jlab.org/DocDB/0009/000949/001/bcm_check_module.pdf 2 / 8

Procedure From the REPORT file output from hcana, I read the: ◮ prescaler ◮ charge ◮ computer live time ◮ electronic live time ◮ tracking efficiency where the prescaler is applied according to the formula 2 Prescale − 1 + 1 � � True Counts = Counts ∗ and the reported charge is scaled by the fraction of events that passed the good selection. 3 / 8

Procedure To calculate Normalized Yield, the equation used is � Good Counts ∗ 2 Prescale − 1 + 1 � � Normalized Yield = Total Charge ∗ η Comp Live ∗ η Elect Live ∗ η Track 4 / 8

Results Carbon χ χ 2 2 / ndf / ndf 0.006657 / 2 0.006657 / 2 1.2 Normalized Yield ± ± Intercept Intercept 1 1 0 0 − − ± ± 1.15 Slope Slope 0.001481 0.001481 0.002863 0.002863 1.1 1.05 1 0.95 0.9 0.85 0.8 35 40 45 50 55 60 Current uA Figure 1 : Noramlized Yield for Carbon target 5 / 8

Results LH2 χ χ 2 2 / ndf / ndf 0.4716 / 8 0.4716 / 8 1.2 Normalized Yield ± ± Intercept Intercept 1 1 0 0 ± ± 1.15 Slope Slope 0.0006657 0.0006657 0.0006209 0.0006209 1.1 1.05 1 0.95 0.9 0.85 0.8 10 20 30 40 50 60 70 80 Current uA Figure 2 : Noramlized Yield for liquid Hydrogen target 6 / 8

Results LD2 χ χ 2 2 / ndf / ndf 0.146 / 6 0.146 / 6 1.2 Normalized Yield ± ± Intercept Intercept 1 1 0 0 ± ± 1.15 Slope Slope 0.001023 0.001023 0.0006604 0.0006604 1.1 1.05 1 0.95 0.9 0.85 0.8 10 20 30 40 50 60 70 80 Current uA Figure 3 : Noramlized Yield for liquid Deutrium target 7 / 8

Work to be Done ◮ Refine error bars (read from scalar information electronic/computer dead time error) ◮ Refine calculation of charge (use scalar information) ◮ Carefully account for impact of ignoring scalar events on various efficiencies ◮ Apply to SHMS scans 8 / 8