تقرير
Hunting down the X17 boson at the CERN SPS
| العنوان: | Hunting down the X17 boson at the CERN SPS |
|---|---|
| المؤلفون: | Depero, E., Andreev, Yu. M., Banerjee, D., Bernhard, J., Burtsev, V., Chumakov, A ., Cooke, D., Dermenev, A., Donskov, S., Dusaev, R., Enik, T., Charitonidis, N., Feshchenko, A., Frolov, V., Gardikiotis, A., Gerassimov, S., Girod, S., Gninenko, S., Hosgen, M., Kachanov, V., Karneyeu, A., Kekelidze, G., Ketzer, B., Kirpichnikov, D., Kirsanov, M., Kolosov, V., Konorov, I., Kovalenko, S., Kramarenko, V., Kravchuk, L., Krasnikov, N., Kuleshov, S., Lyubovitskij, V., Lysan, V., Matveev, V., Mikhailov, Yu., Bueno, L. Molina, Peshekhonov, D., Polyakov, V., Radics, B., Rojas, R., Rubbia, A., Samoylenko, V., Shchukin, D., Sieber, H., Tikhomirov, V., Tlisova, I., Tlisov, D., Toropin, A., Trifonov, A., Vasilishin, B., Vasquez, G., Volkov, P., Volkov, V., Ulloa, P., Crivelli, P. |
| سنة النشر: | 2020 |
| المجموعة: | High Energy Physics - Experiment Physics (Other) |
| مصطلحات موضوعية: | High Energy Physics - Experiment, Physics - Instrumentation and Detectors |
| الوصف: | Recently, the ATOMKI experiment has reported new evidence for the excess of $e^+ e^-$ events with a mass $\sim$17 MeV in the nuclear transitions of $^4$He, that they previously observed in measurements with $^8$Be. These observations could be explained by the existence of a new vector $X17$ boson. So far, the search for the decay $X17 \rightarrow e^+ e^-$ with the NA64 experiment at the CERN SPS gave negative results. Here, we present a new technique that could be implemented in NA64 aiming to improve the sensitivity and to cover the remaining $X17$ parameter space. If a signal-like event is detected, an unambiguous observation is achieved by reconstructing the invariant mass of the $X17$ decay with the proposed method. To reach this goal an optimization of the $X17$ production target, as well as an efficient and accurate reconstruction of two close decay tracks, is required. A dedicated analysis of the available experimental data making use of the trackers information is presented. This method provides independent confirmation of the NA64 published results [Phys. Rev. D101, 071101 (2020)], validating the tracking procedure. The detailed Monte Carlo study of the proposed setup and the background estimate shows that the goal of the proposed search is feasible. |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/2009.02756Test |
| رقم الانضمام: | edsarx.2009.02756 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |