# Multiple hit reconstruction in large area multiplexed detectors

## TL;DR

This paper introduces a new method for reconstructing particle hit positions in multiplexed detectors, effectively resolving ambiguities without prior information by leveraging smoothness assumptions and regularization, demonstrated on a large Micromegas detector.

## Contribution

The paper presents a novel unfolding technique for multiplexed detector signals that reduces ambiguities using regularization and smoothness assumptions, without prior hit information.

## Key findings

- High reconstruction efficiency for single and multiple hits
- Effective ambiguity reduction in multiplexed readout
- Successful application on a large-area detector

## Abstract

A novel approach is presented to unfold particle hit positions in tracking detectors with multiplexed readout representing an underdetermined system of linear equations. The method does not use any prior information about the hit positions, the only assumption in the procedure is that isolated hit signals generated on consecutive detector strips follow a smooth distribution. Ambiguities introduced by charge sharing from multiplexing are reduced by using a regularization technique. We have tested this method on a multiplexed 50x50 cm$^{2}$ Micromegas detector with 1037 strips and only 61 readout channels, using cosmic rays, and we have found that single and multiple clusters of hits can be reconstructed with high efficiency.