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

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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: | 1 . 0 | < 0 . 2 2 /N < 25 . 0 E Cal,Norm > 0 . 8 |

SLIDE 1

HMS Luminosity Scan

Ryan Ambrose

University of Regina

April 26, 2018

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SLIDE 2

Procedure

Using the TSelector framework, I applied several cuts to the data:

◮ |β − 1.0| < 0.2 ◮ χ2/N < 25.0 ◮ ECal,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

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SLIDE 3

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 True Counts = Counts ∗

2Prescale−1 + 1
and the reported charge is scaled by the fraction of events that passed

the good selection.

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SLIDE 4

Procedure

To calculate Normalized Yield, the equation used is Normalized Yield = Good Counts ∗

2Prescale−1 + 1
Total Charge ∗ ηComp Live ∗ ηElect Live ∗ ηTrack

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SLIDE 5

Results

35 40 45 50 55 60 Current uA 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 Normalized Yield / ndf

χ 0.006657 / 2 Intercept ± 1 Slope 0.002863 ± 0.001481 − / ndf

χ 0.006657 / 2 Intercept ± 1 Slope 0.002863 ± 0.001481 −

Carbon Figure 1 : Noramlized Yield for Carbon target

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SLIDE 6

Results

10 20 30 40 50 60 70 80 Current uA 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 Normalized Yield / ndf

χ 0.4716 / 8 Intercept ± 1 Slope 0.0006209 ± 0.0006657 / ndf

χ 0.4716 / 8 Intercept ± 1 Slope 0.0006209 ± 0.0006657

LH2 Figure 2 : Noramlized Yield for liquid Hydrogen target

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SLIDE 7

Results

10 20 30 40 50 60 70 80 Current uA 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 Normalized Yield / ndf

χ 0.146 / 6 Intercept ± 1 Slope 0.0006604 ± 0.001023 / ndf

χ 0.146 / 6 Intercept ± 1 Slope 0.0006604 ± 0.001023

LD2 Figure 3 : Noramlized Yield for liquid Deutrium target

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SLIDE 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

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