在MEG实验中搜索违反由新光粒子介导的MUON衰变的Lepton风味

论文标题

在MEG实验中搜索违反由新光粒子介导的MUON衰变的Lepton风味

Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

论文作者

Baldini, A. M., Berg, F., Biasotti, M., Boca, G., Cattaneo, P. W., Cavoto, G., Cei, F., Chiappini, M., Chiarello, G., Chiri, C., Corvaglia, A., de Bari, A., De Gerone, M., Francesconi, M., Galli, L., Gatti, F., Grancagnolo, F., Grassi, M., Grigoriev, D. N., Hildebrandt, M., Hodge, Z., Ieki, K., Ignatov, F., Iwai, R., Iwamoto, T., Kobayashi, S., Kettle, P. -R., Kyle, W., Khomutov, N., Kolesnikov, A., Kravchuk, N., Kuchinskiy, N., Libeiro, T., Lim, G. M. A., Malyshev, V., Matsuzawa, N., Meucci, M., Mihara, S., Molzon, W., Mori, Toshinori, Mtchedilishvili, A., Nakao, M., Natori, H., Nicolò, D., Nishiguchi, H., Nishimura, M., Ogawa, S., Onda, R., Ootani, W., Oya, A., Palo, D., Panareo, M., Papa, A., Pettinacci, V., Pizzigoni, G., Popov, A., Renga, F., Ritt, S., Rozhdestvensky, A., Rossella, M., Sawada, R., Schwendimann, P., Signorelli, G., Stoykov, A., Tassielli, G. F., Toyoda, K., Uchiyama, Y., Usami, M., Voena, C., Yanai, K., Yudin, Yu. V.

论文摘要

我们提出了第一次直接搜索以违反新的光粒子x介导的muon衰变的直接搜索。该搜索使用了一个数据集，该数据集是$ 7.5 \ times 10^{14} $停止在2009---2013期间在Paul Scherrer Institut收集的MUONS。在40 ps以下的寿命中，质量20-45 MeV/c $^2 $在质量区域中找不到大量过剩，我们将最严格的分支比率设置为20--40 MeV/c $^2 $的质量区域，降低至$ \ nathcal {o}（O}（10^{-11}）$在90 \％的信心水平上。

We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $μ^+ \to \mathrm{e}^+\mathrm{X}, \mathrm{X} \to γγ$. This search uses a dataset resulting from $7.5\times 10^{14}$ stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013. No significant excess is found in the mass region 20--45 MeV/c$^2$ for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20--40 MeV/c$^2$, down to $\mathcal{O}(10^{-11})$ at 90\% confidence level.

下载PDF全文

下载文献需遵守相关版权规定

论文标题