Ionization electron signal processing in single phase LArTPCs. Part I. Algorithm Description and quantitative evaluation with MicroBooNE simulation

Abstract

We describe the concept and procedure of drifted-charge extraction developed in the MicroBooNE experiment, a single-phase liquid argon time projection chamber (LArTPC). This technique converts the raw digitized TPC waveform to the number of ionization electrons passing through a wire plane at a given time. A robust recovery of the number of ionization electrons from both induction and collection anode wire planes will augment the 3D reconstruction, and is particularly important for tomographic reconstruction algorithms. A number of building blocks of the overall procedure are described. The performance of the signal processing is quantitatively evaluated by comparing extracted charge with the true charge through a detailed TPC detector simulation taking into account position-dependent induced current inside a single wire region and across multiple wires. Some areas for further improvement of the performance of the charge extraction procedure are also discussed.

Search for heavy neutral leptons decaying into muon-pion pairs in the MicroBooNE detector

“…The trigger uncertainty is estimated to be in the range (5-10)% depending on the mass of the HNL signal. (3) Dynamically induced charge (DIC) refers to the charge induced on the wires beyond the wire closest to the ionization trail [26,27]. This effect impacts the algorithm that determines the deposited charge, especially on induction planes, as well as the pattern recognition.…”

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“…The procedure is similar to that of our previous study [7] but with an updated version of LArSoft [13] and UBOONECODE [24]. The latter software contains important updates including a data-driven detector noise model [6], noise filtering algorithms, and data-driven TPC charge signal deconvolution kernels [25,26]. These improvements aim to reduce the potential discrepancies between data and simulation samples.…”

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