搜索带有na64- $ e $ $ $ $ $ $ $ $ $ $ prime $ z^prime $ z $ $ $实验

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搜索带有na64- $ e $ $ $ $ $ $ $ $ $ $ prime $ z^prime $ z $ $ $实验

Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

论文作者

Andreev, Yu. M., Banerjee, D., Oberhauser, B. Banto, Bernhard, J., Bisio, P., Bondì, M., Burtsev, V. E., Celentano, A., Charitonidis, N., Chumakov, A. G., Cooke, D., Crivelli, P., Depero, E., Dermenev, A. V., Donskov, S. V., Dusaev, R. R., Enik, T., Frolov, V. N., Gardikiotis, A., Gerassimov, S. G., Gninenko, S. N., Hösgen, M., Jeckel, M., Kachanov, V. A., Karneyeu, A. E., Kekelidze, G., Ketzer, B., Kirpichnikov, D. V., Kirsanov, M. M., Kolosov, V. N., Konorov, I. V., Kovalenko, S. G., Kramarenko, V. A., Kravchuk, L. V., Krasnikov, N. V., Kuleshov, S. V., Lyubovitskij, V. E., Lysan, V., Marsicano, L., Matveev, V. A., Mikhailov, Yu. V., Bueno, L. Molina, Peshekhonov, D. V., Polyakov, V. A., Radics, B., Rojas, R., Rubbia, A., Salamatin, K. M., Samoylenko, V. D., Sieber, H., Shchukin, D., Tikhomirov, V. O., Tlisova, I., Toropin, A. N., Trifonov, A. Yu, Ulloa, P., Vasilishin, B. I., Arenas, G. Vasquez, Volkov, P. V., Volkov, V. Yu., Voronchikhin, I.

论文摘要

通过包含额外$ u（1）$ gauge $l_μ-l_τ$对称的标准模型的扩展可以解释测量值和预测值之间的差异，并在$ b $ erson衰减中解决张力。该模型预测了一种新的，光$ z^\ prime $ vector玻色子的存在，主要耦合到第二代和第三代瘦子，其与电子的相互作用是由于涉及muons和taus的循环机制引起的。在这项工作中，我们对$ z^\ prime $参数空间中的上限进行了严格的评估，该空间是从Cern SPS的Na64- $ E $实验的分析中获得的，该数据对$ 2.84 \ times10^{11} $ Electh的搜索进行了$ 2.84 \ times10^{11} $ Elect的搜索。尽管将限制包括在中微子实验已经调查的一个地区，但仍触摸Muon $ g-2 $首选乐队的$ z^\ prime $ 1 MEV订单的质量。在这种理论情况下，对未来高统计量Na64- $ e $运行的敏感性预测证明了电子/正电子光束方法的力量。

The extension of Standard Model made by inclusion of additional $U(1)$ gauge $L_μ-L_τ$ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in $B$ meson decays. This model predicts the existence of a new, light $Z^\prime$ vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. In this work, we present a rigorous evaluation of the upper limits in the $Z^\prime$ parameter space, obtained from the analysis of the data collected by the NA64-$e$ experiment at CERN SPS, that performed a search for light dark matter with $2.84\times10^{11}$ electrons impinging with 100 GeV on an active thick target. The resulting limits, despite being included in a region already investigated by neutrino experiments,touch the muon $g-2$ preferred band for values of the $Z^\prime$ mass of order of 1 MeV. The sensitivity projections for the future high-statistics NA64-$e$ runs demonstrate the power of the electrons/positron beam approach in this theoretical scenario.

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