# Measurement of cosmic-ray reconstruction efficiencies in the MicroBooNE LArTPC using a small external cosmic-ray counter

Acciarri, R. and An, R. and Anthony, J. and Asaadi, J. and Auger, M. and Bagby, L. and Balasubramanian, S. and Baller, B. and Barnes, C. and Barr, G. and Bass, M. and Bay, F. and Bishai, M. and Blake, A. and Bolton, T. and Camilleri, L. and Caratelli, D. and Carls, B. and Fernandez, R. Castillo and Cavanna, F. and Church, E. and Cianci, D. and Cohen, E. and Collin, G. H. and Conrad, J. M. and Convery, M. and Crespo-Anadon, J. I. and Tutto, M. Del and Devitt, D. and Dytman, S. and Eberly, B. and Ereditato, A. and Sanchez, L. Escudero and Esquivel, J. and Fadeeva, A. A. and Fleming, B. T. and Foreman, W. and Furmanski, A. P. and Garcia-Gamez, D. and Garvey, G. T. and Genty, V. and Goeldi, D. and Gollapinni, S. and Graf, N. and Gramellini, E. and Greenlee, H. and Grosso, R. and Guenette, R. and Lister, A. and Nowak, J. (2017) Measurement of cosmic-ray reconstruction efficiencies in the MicroBooNE LArTPC using a small external cosmic-ray counter. Journal of Instrumentation, 12. ISSN 1748-0221

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PDF (1707.09903v1)
1707.09903v1.pdf - Accepted Version
The MicroBooNE detector is a liquid argon time projection chamber at Fermilab designed to study short-baseline neutrino oscillations and neutrino-argon interaction cross-section. Due to its location near the surface, a good understanding of cosmic muons as a source of backgrounds is of fundamental importance for the experiment. We present a method of using an external 0.5 m (L) x 0.5 m (W) muon counter stack, installed above the main detector, to determine the cosmic-ray reconstruction efficiency in MicroBooNE. Data are acquired with this external muon counter stack placed in three different positions, corresponding to cosmic rays intersecting different parts of the detector. The data reconstruction efficiency of tracks in the detector is found to be $\epsilon_{\mathrm{data}}=(97.1\pm0.1~(\mathrm{stat}) \pm 1.4~(\mathrm{sys}))\%$, in good agreement with the Monte Carlo reconstruction efficiency $\epsilon_{\mathrm{MC}} = (97.4\pm0.1)\%$. This analysis represents a small-scale demonstration of the method that can be used with future data coming from a recently installed cosmic-ray tagger system, which will be able to tag $\approx80\%$ of the cosmic rays passing through the MicroBooNE detector.