arXiv 2001.102582020-01physics.acc-ph

扩展Frascati LINAC正电子束脉冲共振搜索X（17 MeV）玻色子的设想

Ideas for extending the Frascati LINAC positron beam pulses for the resonant search of a X(17 MeV) boson

Paolo Valente

备注：: 16 pages, 10 figures, INFN internal note

摘要：

关于所谓的$^8$ Be异常的结果，最近被激发的$^4$ He核的辐射跃迁中的类似实验证据所证实，可以通过创建一个质量为$m_X\simeq16.7$ MeV/ $c^2$的新粒子来证明。PADME实验，设计用于搜索光暗扇区粒子，如暗光子或类轴子粒子，无论是在$γ+$丢失的能量和$e^+ e^-$最终状态，有可能执行一个完全独立的搜索，也利用截面增强共振$\sqrt{s}\simeq m_X$。在PDMATHAMT（17 MeV）玻色子的情况下，这对应于282 MeV的正电子能量，当湮灭在静止的电子上时。为了保持堆积和过否决概率在控制之下，撞击PADME有源目标的正电子束应该在时间上尽可能多地被稀释。PADME已经在弗拉斯卡蒂束流测试设施收集了第一组数据，使用的是由DA $Φ$ NE LINAC加速的正电子束，最大长度为$\sim$ 200纳秒，能量为490-550 MeV。本文简要讨论了对直线加速器射频系统的可能改进，旨在以最大束流能量为代价进一步延长脉冲长度。

英文摘要：

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.

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