使用Na64实验搜索轴突状和标量颗粒

论文标题

使用Na64实验搜索轴突状和标量颗粒

Search for Axionlike and Scalar Particles with the NA64 Experiment

论文作者

Banerjee, D., Bernhard, J., Burtsev, V. E., Chumakov, A. G., Cooke, D., Crivelli, P., Depero, E., Dermenev, A. V., Donskov, S. V., Dusaev, R. R., Enik, T., Charitonidis, N., Feshchenko, A., Frolov, V. N., Gardikiotis, A., Gerassimov, S. G., Gninenko, S. N., Hosgen, 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., Matveev, V. A., Mikhailov, Yu. V., Bueno, L. Molina, Peshekhonov, D. V., Polyakov, V. A., Radics, B., Rojas, R., Rubbia, A., Samoylenko, V. D., Sieber, H., Shchukin, D., Tikhomirov, V. O., Tlisova, I., Tlisov, D. A., Toropin, A. N., Trifonov, A. Yu., Vasilishin, B. I., Arenas, G. Vasquez, Volkov, P. V., Volkov, V. Yu., Ulloa, P.

论文摘要

我们通过使用高能量的Cern SPS H4电子束对光标量（S）和伪尺度轴突（A）颗粒进行了独立的搜索。如果存在新粒子，则可以通过Primakoff效应在Na64活性转储中100 GEV电子产生的硬质bremsstrahlung光子的相互作用中产生，并具有由转储的核提供的虚拟光子。 A（S）将穿透下游HCAL模块，作为屏蔽，并通过其在HCAL探测器的其余部分中通过其$ A（S）\toγγ$衰减观察到，或者是HCAL下游的A（S）衰减的事件。此方法允许探测A（s）参数空间，包括从通用轴模型中，无法访问先前的实验。从目标的数据分析中，没有发现此类过程的证据，该数据对应于目标$ 2.84 \ times10^{11} $电子，允许在55 MEV低于55 MEV的$ a（s）γγ$ - 耦合强度上设置新的限制。

We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the Primakoff effect in interactions of hard bremsstrahlung photons generated by 100 GeV electrons in the NA64 active dump with virtual photons provided by the nuclei of the dump. The a(s) would penetrate the downstream HCAL module, serving as shielding, and would be observed either through their $a(s)\toγγ$ decay in the rest of the HCAL detector or as events with large missing energy if the a(s) decays downstream of the HCAL. This method allows for the probing the a(s) parameter space, including those from generic axion models, inaccessible to previous experiments. No evidence of such processes has been found from the analysis of the data corresponding to $2.84\times10^{11}$ electrons on target allowing to set new limits on the $a(s)γγ$-coupling strength for a(s) masses below 55 MeV.

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