Proof of principle for a light dark matter search with low-energy positron beams at NA64
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres, D. Banerjee, B. Banto Oberhauser, V. Bautin, J. Bernhard, P. Bisio, M. Bondì, A. Celentano, N. Charitonidis, P. … 展开作者
Yu. M. Andreev, A. Antonov, M. A. Ayala Torres, D. Banerjee, B. Banto Oberhauser, V. Bautin, J. Bernhard, P. Bisio, M. Bondì, A. Celentano, N. Charitonidis, P. Crivelli, A. V. Dermenev, S. V. Donskov, R. R. Dusaev, T. Enik, V. N. Frolov, S. V. Gertsenberger, S. Girod, S. N. Gninenko, M. Hösgen, Y. Kambar, A. E. Karneyeu, G. Kekelidze, B. Ketzer, D. V. Kirpichnikov, M. M. Kirsanov, V. A. Kramarenko, L. V. Kravchuk, N. V. Krasnikov, S. V. Kuleshov, V. E. Lyubovitskij, V. Lysan, A. Marini, L. Marsicano, V. A. Matveev, R. Mena Fredes, R. Mena Yanssen, L. Molina Bueno, M. Mongillo, D. V. Peshekhonov, V. A. Polyakov, B. Radics, K. Salamatin, V. D. Samoylenko, H. Sieber, D. Shchukin, O. Soto, V. O. Tikhomirov, I. Tlisova, A. N. Toropin, M. Tuzi, P. Ulloa, P. V. Volkov, I. V. Voronchikhin, J. Zamora-Saá, A. S. Zhevlakov
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. In this picture, a new feeble interaction acts as a "portal" between the Standard Model and LDM particles, allowing for the exploration of this paradigm at accelerator experiments. In the last years, the "missing energy" experiment NA64e at CERN SPS (Super Proton Synchrotron) has set world-leading constraints in the vector-mediated LDM parameter space, by exploiting a 100 GeV electron beam impinging on an electromagnetic calorimeter, acting as an active target. In this paper, we report a detailed description of the analysis of a preliminary measurement with a 70 GeV positron beam at NA64e, performed during summer 2023 with an accumulated statistic of 1.6 x 10^10 positrons on target. This data set was analyzed with the primary aim of evaluating the performance of the NA64e detector with a lower energy positron beam, towards the realization of the post-LS3 program. The analysis results, other than additionally probing unexplored regions in the LDM parameter space, provide valuable information towards the future NA64e positron campaign.
Dark sector searches with high-intensity positron beams in the CERN North Area
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati（意大利国家核物理研究所，弗拉斯卡蒂国家实验室）；Université Claude Bernard Lyon 1, CNRS/IN2P3, Institut de Physique des 2 Infinis de Lyon, UMR 5822（里昂第一大学，法国国家科学研究中心/法国国家粒子物理研究所，两个无限物理研究所）；Sapienza University, Department of Physics（罗马智慧大学，物理系）；INFN, Sezione di Roma（意大利国家核物理研究所，罗马分部）；Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所，格兰萨索国家实验室）；Faculty of Physics, Sofia University “St. Kl. Ohridski”（索非亚大学“圣克利门特·奥赫里德斯基”学院物理系）；Laboratory of High Energy and Computational Physic, HEPC-NICPB（高能计算物理实验室）；CERN（欧洲核子研究组织）
ILC正电子系统使用新颖的螺旋波荡器从主电子束产生强大的光子束。该束通过钛靶将其转化为电子-正电子对。目标被构造为以2000 RPM旋转的1 m直径的轮，以将1 ms ILC脉冲训练涂抹超过10 cm。脉冲磁通集中磁体用于提高正电子捕获效率。将其冷却至液氮温度以使1 ms ILC脉冲训练上的磁场的平坦度最大化。我们报告在这个系统上的原型工作。
