论文标题
扩展frascati linac正电子束脉冲的想法，用于X（17 MeV）玻色子的共鸣
Ideas for extending the Frascati LINAC positron beam pulses for the resonant search of a X(17 MeV) boson
论文作者
论文摘要
所谓的$^8 $的结果是反常的，最近在激发$^4 $ He nuclei的辐射过渡中得到了类似的实验证据，可以通过创建新粒子的质量为$ m_x \ simeq16.7 $ meV/$ c^2 $来证明是合理的。 PADME实验旨在搜索$γ+ $缺失的能量和$ e^+ e^ - $最终状态，均以$γ+ $缺失的能量（例如$γ+ $）搜索浅色黑暗区域的颗粒，具有进行完全独立的搜索，还利用了Resonance $ \ sqrt \ sqrt {s}}} \ simeq m_x $ simeq m_x $ sime simeq m_x sime simeq m_x $ sime simeq m_x $。对于$ x $（17 meV）玻色子的情况，这对应于在静止的电子上歼灭电子时的正电子能量为282 meV。为了保持堆积和控制概率的控制，击中PADME主动目标的正电子光束应尽可能稀释。 Padme已经使用由Da $φ$ NE LINAC加速的正电子梁在Frascati Beam-Test设施上收集了第一个数据集，最大长度为$ \ sim $ 200 NS和Energy 490-550 MEV。在本说明中，简要讨论了对LINAC的RF系统的可能修改，旨在进一步延长最大束能量的脉冲长度。
The results on the so-called $^8$Be anomaly, recently corroborated by similar experimental evidence in the radiative transitions of excited $^4$He nuclei, could be justified by the creation of a new particle with a mass of $m_X\simeq16.7$ MeV/$c^2$. The PADME experiment, designed for searching light dark sector particles, like a dark photon or an axion-like particle, both in $γ+$ missing energy and $e^+ e^-$ final states, has the potential of performing a completely independent search, also exploiting the cross-section enhancement at the resonance $\sqrt{s}\simeq m_X$. In the case of the $X$(17 MeV) boson, this corresponds to a positron energy of 282 MeV when annihilating on electrons at rest. In order to keep the pile-up and the over-veto probabilities under control, the positron beam hitting the PADME active target should be as much diluted in time as possible. PADME has already collected a first data-set at the Frascati beam-test facility, using the positron beam accelerated by the DA$Φ$NE LINAC, with maximum length of $\sim$200 ns and energy 490-550 MeV. In this note, the possible modifications to the RF system of the LINAC, aiming at further extending the pulse length at the expenses of the maximum beam energy, are briefly discussed.
