论文标题
直接观察$ c $ - $τ$工厂和其他$ e^+e^ - $ - collider
On direct observation of millicharged particles at $c$-$τ$ factories and other $e^+e^-$-colliders
论文作者
论文摘要
如果允许运动允许，则可以在电子峰值歼灭中产生带有微小电荷的假设颗粒（Millicharged颗粒或MCP）。典型的搜索在$ e^+e^ - $ colliders利用单个光子的签名，其丢失的能量被未发现的MCP对带走。我们提出了一个想法，可以或者在跟踪器内部的MCP能量沉积物中寻找，这是一个直接观察。新的签名与非权威主义的MCP相关，我们以$ C $ - $τ$ Factory的示例说明了其功率，我们认为相应的搜索可能不含背景。我们发现，它可以将MCP充电降低至$ 3 \ times10^{ - 3} $，以$ {\ cal o}（5）每个能量光束价值的$ MEV附近，工厂将收集100 fb $^{ - 1} $的亮度。该质量区域无法探索缺失的能量和单个光子。
Hypothetical particles with tiny electric charges (millicharged particles or MCPs) can be produced in electron-positron annihilation if kinematically allowed. Typical searches for them at $e^+e^-$ colliders exploit a signature of a single photon with missing energy carried away by the undetected MCP pair. We put forward an idea to look alternatively for MCP energy deposits inside a tracker, which is a direct observation. The new signature is relevant for non-relativistic MCPs, and we illustrate its power on the example of the $c$-$τ$ factory, where we argued that the corresponding searches may be background-free. We find that it can probe the MCP charge down to $3\times10^{-3}$ of the electron charge for the MCP masses in ${\cal O}(5)$ MeV vicinity of each energy beam value where the factory will collect a luminosity of 100 fb$^{-1}$ in one year. This mass region is unreachable with the searches for missing energy and single photon.
