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2 results on '"Coutu C"'

1. Dark Matter Search Results from the Complete Exposure of the PICO-60 C$_3$F$_8$ Bubble Chamber

Author

Amole, C., Ardid, M., Arnquist, I. J., Asner, D. M., Baxter, D., Behnke, E., Bressler, M., Broerman, B., Cao, G., Chen, C. J., Chowdhury, U., Clark, K., Collar, J. I., Cooper, P. S., Coutu, C. B., Cowles, C., Crisler, M., Crowder, G., Cruz-Venegas, N. A., Dahl, C. E., Das, M., Fallows, S., Farine, J., Felis, I., Filgas, R., Girard, F., Giroux, G., Hall, J., Hardy, C., Harris, O., Hillier, T., Hoppe, E. W., Jackson, C. M., Jin, M., Klopfenstein, L., Krauss, C. B., Laurin, M., Lawson, I., Leblanc, A., Levine, I., Licciardi, C., Lippincott, W. H., Loer, B., Mamedov, F., Mitra, P., Moore, C., Nania, T., Neilson, R., Noble, A. J., Oedekerk, P., Ortega, A., Piro, M. -C., Plante, A., Podviyanuk, R., Priya, S., Robinson, A. E., Sahoo, S., Scallon, O., Seth, S., Sonnenschein, A., Starinski, N., Štekl, I., Sullivan, T., Tardif, F., Vázquez-Jáuregui, E., Walkowski, N., Weima, E., Wichoski, U., Wierman, K., Yan, Y., Zacek, V., and Zhang, J.

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment
Abstract

Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 2.5 $\times$ 10$^{-41}$ cm$^2$ for a 25 GeV WIMP, and improve on previous PICO results for 3-5 GeV WIMPs by an order of magnitude., Comment: 9 pages, 8 figures

Published
2019
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2. Developing a Bubble Chamber Particle Discriminator Using Semi-Supervised Learning

Author

Matusch, B., Amole, C., Ardid, M., Arnquist, I. J., Asner, D. M., Baxter, D., Behnke, E., Bressler, M., Broerman, B., Cao, G., Chen, C. J., Chowdhury, U., Clark, K., Collar, J. I., Cooper, P. S., Coutu, C. B., Cowles, C., Crisler, M., Crowder, G., Cruz-Venegas, N. A., Carl Eric Dahl, Das, M., Fallows, S., Farine, J., Felis, I., Filgas, R., Girard, F., Giroux, G., Hall, J., Hardy, C., Harris, O., Hillier, T., Hoppe, E. W., Jackson, C. M., Jin, M., Klopfenstein, L., Krauss, C. B., Laurin, M., Lawson, I., Leblanc, A., Levine, I., Licciardi, C., Lippincott, W. H., Loer, B., Mamedov, F., Mitra, P., Moore, C., Nania, T., Neilson, R., Noble, A. J., Oedekerk, P., Ortega, A., Piro, M. -C, Plante, A., Podviyanuk, R., Priya, S., Robinson, A. E., Sahoo, S., Scallon, O., Seth, S., Sonnenschein, A., Starinski, N., Štekl, I., Sullivan, T., Tardif, F., Vázquez-Jáuregui, E., Walkowski, N., Weima, E., Wichoski, U., Wierman, K., Yan, Y., Zacek, V., and Zhang, J.

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Computational Physics (physics.comp-ph), Physics - Computational Physics
Abstract

The identification of non-signal events is a major hurdle to overcome for bubble chamber dark matter experiments such as PICO-60. The current practice of manually developing a discriminator function to eliminate background events is difficult when available calibration data is frequently impure and present only in small quantities. In this study, several different discriminator input/preprocessing formats and neural network architectures are applied to the task. First, they are optimized in a supervised learning context. Next, two novel semi-supervised learning algorithms are trained, and found to replicate the Acoustic Parameter (AP) discriminator previously used in PICO-60 with a mean of 97% accuracy., Comment: 27 pages, 10 figures

Published
2018
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