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Abratenko, P.; Asaadi, J.; Ashkenazi, A.; Balasubramanian, S.; Baller, B.; Barr, G.; Barrow, J.; Basque, V.; Bhattacharya, M.; Bishai, M.; Blake, A.; Bolton, T.; Book, J. Y.; Brunetti, M. B.; Camilleri, L.; Cao, Y.; Cerati, G.; Conrad, J. M.; Cooper-Troendle, L.; Del Tutto, M.; Detje, P.; Dorrill, R.; Duffy, K.; Dytman, S.; Englezos, P.; Ereditato, A.; Fleming, B. T.; Franco, D.; Furmanski, A. P.; Garcia-Gamez, D.; Ge, G.; Gollapinni, S.; Greenlee, H.; Gu, L.; Guzowski, P.; Hagaman, L.; Hen, O.; Hilgenberg, C.; Imani, Z.; Ismail, M. S.; James, C.; Ji, X.; Kalra, D.; Karagiorgi, G.; Kobilarcik, T.; Kreslo, I.; Lepetic, I.; Li, J.-Y.; Li, K.; Littlejohn, B. R.; Louis, W. C.; Luo, X.; Mariani, C.; Marsden, D.; Martinez, N.; Martinez Caicedo, D. A.; Martynenko, S.; Micallef, J.; Mogan, A.; Mohayai, T.; Mooney, M.; Moor, A. F.; Naples, D.; Navrer-Agasson, A.; Nayak, N.; Palamara, O.; Papadopoulou, A.; Papavassiliou, V.; Parkinson, H. B.; Pate, S. F.; Pavlovic, Z.; Radeka, V.; Ross-Lonergan, M.; Rudolf von Rohr, C.; Schmitz, D. W.; Schukraft, A.; Sharankova, R.; Shi, J.; Soderberg, M.; Söldner-Rembold, S.; Spitz, J.; Stancari, M.; Tang, W.; Taniuchi, N.; Terao, K.; Torbunov, D.; Totani, D.; Toups, M.; Tsai, Y.-T.; Tyler, J.; Usher, T.; Viren, B.; Wei, H.; Wolbers, S.; Wresilo, K.; Wu, W.; Yang, T.; Yates, L. E.; Yu, H. W.; Zhang, C.
Physical review letters, 06/2024, Letnik: 132, Številka: 24Journal Article
We present a first search for dark-trident scattering in a neutrino beam using a dataset corresponding to 7.2 × 10 20 protons on target taken with the MicroBooNE detector at Fermilab. Proton interactions in the neutrino target at the main injector produce π 0 and η mesons, which could decay into dark-matter (DM) particles mediated via a dark photon A ′ . A convolutional neural network is trained to identify interactions of the DM particles in the liquid-argon time projection chamber (LArTPC) exploiting its imagelike reconstruction capability. In the absence of a DM signal, we provide limits at the 90% confidence level on the squared kinematic mixing parameter ϵ 2 as a function of the dark-photon mass in the range 10 ≤ M A ′ ≤ 400 MeV . The limits cover previously unconstrained parameter space for the production of fermion or scalar DM particles χ for two benchmark models with mass ratios M χ / M A ′ = 0.6 and 2 and for dark fine-structure constants 0.1 ≤ α D ≤ 1 . Published by the American Physical Society 2024
