Cross section of the process \(e^+e^-\to n\bar{n}\) near the threshold

The \(e^+e^-\to n\bar{n}\) cross section was measured at center of mass (c.m.) energies from the threshold to 1908 MeV. The experiment to measure the cross section has been carried out at the VEPP-2000 \(e^+e^-\) collider in 13 energy points. The SND detector is used to detect the produced neutron-a...

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Published in:arXiv.org 2024-07
Main Authors: Achasov, M N, A Yu Barnyakov, Bedarev, E V, Beloborodov, K I, Berdyugin, A V, Bogdanchikov, A G, Botov, A A, Dimova, T V, Druzhinin, V P, Zhabin, V N, Zharinov, Yu M, Kardapoltsev, L V, Kasaev, A S, Kattsin, A A, Kovrizhin, D P, Korol, A A, Kupich, A S, Kryukov, A P, Lysenko, A P, Melnikova, N A, N Yu Muchnoi, Obrazovsky, A E, Pakhtusova, E V, Pugachev, K V, Rastigeev, S A, Rogovsky, Yu A, Senchenko, A I, Serednyakov, S I, Silagadze, Z K, Surin, I K, Usov, Yu V, Kharlamov, A G, Chistyakov, D E, Shatunov, Yu M, Sherstyuk, S P, Shtol, D A
Format: Article
Language:English
Subjects:
Antiparticles
Cross-sections
Form factors
Time measurement
Online Access:Get full text
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Summary:The \(e^+e^-\to n\bar{n}\) cross section was measured at center of mass (c.m.) energies from the threshold to 1908 MeV. The experiment to measure the cross section has been carried out at the VEPP-2000 \(e^+e^-\) collider in 13 energy points. The SND detector is used to detect the produced neutron-antineutrons (\(n\bar{n}\)) events. A special time measurement system on the calorimeter was used to select the time-delayed \(n\bar{n}\) events. The measured \(e^+e^-\to n\bar{n}\) cross section is 0.4--0.6 nb. The neutron effective timelike form factor in the energy range under study varies from 0.3 to 0.6.
ISSN:2331-8422