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26 April 2024 |
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Article overview
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A Scaler-Based Data Acquisition System for Measuring Parity Violation Asymmetry in Deep Inelastic Scattering | | Ramesh Subedi
; Diancheng Wang
; Kai Pan
; Xiaoyan Deng
; Robert Michaels
; Paul E. Reimer
; Albert Shahinyan
; Bogdan Wojtsekhowski
; Xiaochao Zheng
; | | Date: |
12 Feb 2013 | | Abstract: | An experiment that measured the parity violating asymmetries in deep
inelastic scattering was completed at the Thomas Jefferson National Accelerator
Facility in experimental Hall A. From these asymmetries, a combination of the
quark weak axial charge could be extracted with a factor of five improvement in
precision over world data. To achieve this, asymmetries at the $10^{-4}$ level
needed to be measured at event rates up to 500 kHz and the high pion background
typical to deep inelastic scattering experiments needed to be rejected
efficiently. A specialized data acquisition (DAQ) system with intrinsic
particle identification (PID) was successfully developed and used: The pion
contamination in the electron samples was controlled at the order of $2 imes
10^{-4}$ or below with an electron efficiency of higher than 91% throughout the
production period of the experiment, the systematic uncertainty in the measured
asymmetry due to DAQ deadtime was below 0.2%, and the statistical quality of
the asymmetry measurement agreed with the Gaussian distribution to over five
orders of magnitudes. The DAQ system is presented here with an emphasis on its
design scheme, the achieved PID performance, deadtime effect and the capability
of measuring small asymmetries. | | Source: | arXiv, 1302.2854 | | Services: | Forum | Review | PDF | Favorites | |
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