학술논문
First search for dark-trident processes using the MicroBooNE detector
Document Type
Working Paper
Author
MicroBooNE collaboration; Abratenko, P.; Alterkait, O.; Aldana, D. Andrade; Arellano, L.; Asaadi, J.; Ashkenazi, A.; Balasubramanian, S.; Baller, B.; Barr, G.; Barrow, D.; Barrow, J.; Basque, V.; Rodrigues, O. Benevides; Berkman, S.; Bhanderi, A.; Bhat, A.; Bhattacharya, M.; Bishai, M.; Blake, A.; Bogart, B.; Bolton, T.; Book, J. Y.; Brunetti, M. B.; Camilleri, L.; Cao, Y.; Caratelli, D.; Cavanna, F.; Cerati, G.; Chappell, A.; Chen, Y.; Conrad, J. M.; Convery, M.; Cooper-Troendle, L.; Crespo-Anadon, J. I.; Cross, R.; Del Tutto, M.; Dennis, S. R.; Detje, P.; Devitt, A.; Diurba, R.; Djurcic, Z.; Dorrill, R.; Duffy, K.; Dytman, S.; Eberly, B.; Englezos, P.; Ereditato, A.; Evans, J. J.; Fine, R.; Finnerud, O. G.; Fleming, B. T.; Foreman, W.; Franco, D.; Furmanski, A. P.; Gao, F.; Garcia-Gamez, D.; Gardiner, S.; Ge, G.; Gollapinni, S.; Gramellini, E.; Green, P.; Greenlee, H.; Gu, L.; Gu, W.; Guenette, R.; Guzowski, P.; Hagaman, L.; Hen, O.; Hilgenberg, C.; Horton-Smith, G. A.; Imani, Z.; Irwin, B.; Ismail, M. S.; James, C.; Ji, X.; Jo, J. H.; Johnson, R. A.; Jwa, Y. J.; Kalra, D.; Kamp, N.; Karagiorgi, G.; Ketchum, W.; Kirby, M.; Kobilarcik, T.; Kreslo, I.; Leibovitch, M. B.; Lepetic, I.; Li, J. -Y.; Li, K.; Li, Y.; Lin, K.; Littlejohn, B. R.; Liu, H.; Louis, W. C.; Luo, X.; Mariani, C.; Marsden, D.; Marshall, J.; Martinez, N.; Caicedo, D. A. Martinez; Martynenko, S.; Mastbaum, A.; Mawby, I.; McConkey, N.; Meddage, V.; Micallef, J.; Miller, K.; Mistry, K.; Mohayai, T.; Mogan, A.; Mooney, M.; Moor, A. F.; Moore, C. D.; Lepin, L. Mora; Moudgalya, M. M.; Babu, S. Mulleria; Naples, D.; Navrer-Agasson, A.; Nayak, N.; Nebot-Guinot, M.; Nowak, J.; Oza, N.; Palamara, O.; Pallat, N.; Paolone, V.; Papadopoulou, A.; Papavassiliou, V.; Parkinson, H.; Pate, S. F.; Patel, N.; Pavlovic, Z.; Piasetzky, E.; Pophale, I.; Qian, X.; Raaf, J. L.; Radeka, V.; Rafique, A.; Reggiani-Guzzo, M.; Ren, L.; Rochester, L.; Rondon, J. Rodriguez; Rosenberg, M.; Ross-Lonergan, M.; von Rohr, C. Rudolph; Safa, I.; Scanavini, G.; Schmitz, D. W.; Schukraft, A.; Seligman, W.; Shaevitz, M. H.; Sharankova, R.; Shi, J.; Snider, E. L.; Soderberg, M.; Soldner-Rembold, S.; Spitz, J.; Stancari, M.; John, J. St.; Strauss, T.; Szelc, A. M.; Tang, W.; Taniuchi, N.; Terao, K.; Thorpe, C.; Torbunov, D.; Totani, D.; Toups, M.; Tsai, Y. -T.; Tyler, J.; Uchida, M. A.; Usher, T.; Viren, B.; Weber, M.; Wei, H.; White, A. J.; Wolbers, S.; Wongjirad, T.; Wospakrik, M.; Wresilo, K.; Wu, W.; Yandel, E.; Yang, T.; Yates, L. E.; Yu, H. W.; Zeller, G. P.; Zennamo, J.; Zhang, C.
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Abstract
We present a first search for dark-trident scattering in a neutrino beam using a data set corresponding to $7.2 \times 10^{20}$ protons on target taken with the MicroBooNE detector at Fermilab. Proton interactions in the neutrino target at the Main Injector produce $\pi^0$ and $\eta$ mesons, which could decay into dark-matter (DM) particles mediated via a dark photon $A^\prime$. A convolutional neural network is trained to identify interactions of the DM particles in the liquid-argon time projection chamber (LArTPC) exploiting its image-like reconstruction capability. In the absence of a DM signal, we provide limits at the $90\%$ confidence level on the squared kinematic mixing parameter $\varepsilon^2$ as a function of the dark-photon mass in the range $10\le M_{A^\prime}\le 400$ MeV. The limits cover previously unconstrained parameter space for the production of fermion or scalar DM particles $\chi$ for two benchmark models with mass ratios $M_{\chi}/M_{A^\prime}=0.6$ and $2$ and for dark fine-structure constants $0.1\le\alpha_D\le 1$.