Search for the X17 particle in $^{7}\mathrm{Li}(\mathrm{p},\mathrm{e}^+ \mathrm{e}^{-}) ^{8}\mathrm{Be}$ processes with the MEG II detector

Autor: The MEG II collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Benmansour, H., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Corvaglia, A., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Leonetti, F., Li, W., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, T., Nicolò, D., Nishiguchi, H., Ochi, A., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Renga, F., Ritt, S., Rossella, M., Scarpellini, A. Rozhdestvensky. S., Schwendimann, P., Signorelli, G., Takahashi, M., Uchiyama, Y., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yokota, R., Yonemoto, T.

The observation of a resonance structure in the opening angle of the electron-positron pairs in the $^{7}$Li(p,\ee) $^{8}$Be reaction was claimed and interpreted as the production and subsequent decay of a hypothetical particle (X17). Similar excesse

Externí odkaz: http://arxiv.org/abs/2411.07994

Operation and performance of MEG II detector

Autor: MEG II Collaboration, Afanaciev, K., Baldini, A. M., Ban, S., Baranov, V., Benmansour, H., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Corvaglia, A., Cuna, F., Maso, G. Dal, De Bari, A., De Gerone, M., Barusso, L. Ferrari, Francesconi, M., Galli, L., Gallucci, G., Gatti, F., Gerritzen, L., Grancagnolo, F., Grandoni, E. G., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Ieki, K., Ignatov, F., Ikeda, F., Iwamoto, T., Karpov, S., Kettle, P. -R., Khomutov, N., Kobayashi, S., Kolesnikov, A., Kravchuk, N., Krylov, V., Kuchinskiy, N., Kyle, W., Libeiro, T., Malyshev, V., Matsushita, A., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Morsani, F., Nakao, M., Nicolò, D., Nishiguchi, H., Ochi, A., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Popov, A., Raffaelli, F., Renga, F., Ritt, S., Rossella, M., Rozhdestvensky, A., Schwendimann, P., Shimada, K., Signorelli, G., Stoykov, A., Takahashi, M., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Venturini, A., Vitali, B., Voena, C., Yamamoto, K., Yanai, K., Yonemoto, T., Yoshida, K., Yudin, Yu. V.

The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensi

Externí odkaz: http://arxiv.org/abs/2310.11902

Technical design of the phase I Mu3e experiment

Autor: Arndt, K., Augustin, H., Baesso, P., Berger, N., Berg, F., Betancourt, C., Bortoletto, D., Bravar, A., Briggl, K., Bruch, D. vom, Buonaura, A., Cadoux, F., Barajas, C. Chavez, Chen, H., Clark, K., Cooke, P., Corrodi, S., Damyanova, A., Demets, Y., Dittmeier, S., Eckert, P., Ehrler, F., Fahrni, D., Gagneur, S., Gerritzen, L., Goldstein, J., Gottschalk, D., Grab, C., Gredig, R., Groves, A., Hammerich, J., Hartenstein, U., Hartmann, U., Hayward, H., Herkert, A., Hesketh, G., Hetzel, S., Hildebrandt, M., Hodge, Z., Hofer, A., Huang, Q. H., Hughes, S., Huth, L., Immig, D. M., Jones, T., Jones, M., Kästli, H. -C., Köppel, M., Kettle, P. -R., Kiehn, M., Kilani, S., Klingenmeyer, H., Knecht, A., Knight, A., Kotlinski, B., Kozlinskiy, A., Leys, R., Lockwood, G., Loreti, A., La Marra, D., Müller, M., Meier, B., Aeschbacher, F. Meier, Meneses, A., Metodiev, K., Mtchedlishvili, A., Muley, S., Munwes, Y., Noehte, L. O. S., Owen, P., Papa, A., Paraskevas, I., Períc, I., Perrevoort, A. -K., Plackett, R., Pohl, M., Ritt, S., Robmann, P., Rompotis, N., Rudzki, T., Rutar, G., Schöning, A., Schimassek, R., Schultz-Coulon, H. -C., Serra, N., Shen, W., Shipsey, I., Shrestha, S., Steinkamp, O., Stoykov, A., Straumann, U., Streuli, S., Stumpf, K., Tata, N., Velthuis, J., Vigani, L., Vilella-Figueras, E., Vossebeld, J., Wallny, R., Wasili, A., Wauters, F., Weber, A., Wiedner, D., Windelband, B., Zhong, T.

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Vol. 1014 (2021) 165679

The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu \rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed

Externí odkaz: http://arxiv.org/abs/2009.11690

Towards large calorimeters based on Lanthanum Bromide or LYSO crystals coupled to silicon photomultipliers: A first direct comparison for future precision physics

Autor: Papa, A., Schwendimann, P., Baldini, A.M., Benmansour, H., Cei, F., Chiappini, M., Chiarello, G., dal Maso, G., Francesconi, M., Galli, L., Grassi, M., Greuter, U., Gurgone, A., Kuenzi, L., Nicolo, D., Ritt, S., Signorelli, G., Venturini, A., Vitali, B.

Publikováno v: In Nuclear Inst. and Methods in Physics Research, A April 2023 1049

Results from Pilot Run for MEG II Positron Timing Counter

Autor: Nakao, M., De Bari, A., Biasotti, M., Boca, G., Cattaneo, P. W., Francesconi, M., De Gerone, M., Galli, L., Gatti, F., Mtchedilishvili, A., Nicol, D., Nishimura, M., Ootani, W., Ritt, S., Rossella, M., Simonetta, M., Uchiyama, Y., Usami, M.

Publikováno v: Springer Proc. Phys. 213 (2018) 237-241

The MEG II experiment at Paul Scherrer Institut in Switzerland will search for the lepton flavour violating muon decay, $\mu^+\to e^+\gamma$, with a sensitivity of $4\times10^{-14}$ improving the existing limit of an order of magnitude. In 2016, we f

Externí odkaz: http://arxiv.org/abs/1808.07279