$ \ sqrt {s} = 20 $ meV的两光量歼灭正面的横截面测量

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$ \ sqrt {s} = 20 $ meV的两光量歼灭正面的横截面测量

Cross-section measurement of two-photon annihilation in-flight of positrons at $\sqrt{s}=20$ MeV with the PADME detector

论文作者

Bossi, F., Branchini, P., Buonomo, B., Capirossi, V., Caricato, A. P., Chiodini, G., De Sangro, R., Di Giulio, C., Domenici, D., Ferrarotto, F., Finocchiaro, G., Foggetta, L. G, Frankenthal, A., Garattini, M., Georgiev, G., Giacchino, F., Gianotti, P., Ivanov, S., Ivanov, Sv., Kozhuharov, V., Leonardi, E., Long, E., Martino, M., Oceano, I., Oliva, F., Organtini, G. C., Pinna, F., Piperno, G., Raggi, M., Sarra, I., Simeonov, R., Spadaro, T., Spagnolo, S., Spiriti, E., Tagnani, D., Taruggi, C., Valente, P., Vilucchi, E.

论文摘要

在飞行$ e^+e^+e^ - \rightArrowγ$ 430 meV正电子的nih灭的包含横截面上，用薄钻石目标的原子电子在Laboratori nazionali di frascati的Padme检测器中测量了薄钻石目标的原子电子。通过BGO晶体制成的电磁热量表检测到该过程中产生的两个光子。该测量是基于直接检测光子对的第一个测量值，也是低于1 GEV的正电子能的最精确的测量值之一。该测量是搜索黑暗扇形颗粒的必要步骤，并且较弱的介体与光子和/或电子的质量相结合，质量为1 MEV至20 MEV，带有Padme。该测量与在总体6％的不确定性内进行QED预测的接下来的订单相一致。

The inclusive cross-section of annihilation in flight $e^+e^-\rightarrowγγ$ of 430 MeV positrons with atomic electrons of a thin diamond target has been measured with the PADME detector at the Laboratori Nazionali di Frascati. The two photons produced in the process were detected by an electromagnetic calorimeter made of BGO crystals. This measurement is the first one based on the direct detection of the photon pair and one of the most precise for positron energies below 1 GeV. This measurement represents a necessary step to search for dark sector particles and mediators weakly coupled to photons and/or electrons with masses ranging from 1 MeV to 20 MeV with PADME. The measurement agrees with the Next to Leading Order QED prediction within the overall 6% uncertainty.

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