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Measurement of the \(e^+e^-\to\pi^+\pi^-\) cross section from threshold to 1.2 GeV with the CMD-3 detector

CMD-3 Collaboration ; Ignatov, F V ; Akhmetshin, R R ; Amirkhanov, A N ; Anisenkov, A V ; Aulchenko, V M ; Bashtovoy, N S ; Berkaev, D E ; Bondar, A E ; Bragin, A V ; Eidelman, S I ; Epifanov, D A ; Epshteyn, L B ; Erofeev, A L ; Fedotovich, G V ; Gorkovenko, A O ; Grancagnolo, F J ; Grebenuk, A A ; Gribanov, S S ; Grigoriev, D N ; Ivanov, V L ; Karpov, S V ; Kasaev, A S ; Kazanin, V F ; Khazin, B I ; Kirpotin, A N ; Koop, I A ; Korobov, A A ; Kozyrev, A N ; Kozyrev, E A ; Krokovny, P P ; Kuzmenko, A E ; Kuzmin, A S ; Logashenko, I B ; Lukin, P A ; Lysenko, A P ; K Yu Mikhailov ; Obraztsov, I V ; Okhapkin, V S ; Otboev, A V ; Perevedentsev, E A ; Pestov, Yu N ; Popov, A S ; Razuvaev, G P ; Rogovsky, Yu A ; Ruban, A A ; Ryskulov, N M ; Ryzhenenkov, A E ; Semenov, A V ; Senchenko, A I ; P Yu Shatunov ; Shatunov, Yu M ; Shebalin, V E ; Shemyakin, D N ; Shwartz, B A ; Shwartz, D B ; Sibidanov, A L ; Solodov, E P ; Talyshev, A A ; Timoshenko, M V ; Titov, V M ; Tolmachev, S S ; Vorobiov, A I ; Zemlyansky, I M ; Zhadan, D S ; Zharinov, Yu M ; Zubakin, A S ; Yudin, Yu V

arXiv.org, 2024-06

Ithaca: Cornell University Library, arXiv.org

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Título:
Measurement of the \(e^+e^-\to\pi^+\pi^-\) cross section from threshold to 1.2 GeV with the CMD-3 detector
Autor: CMD-3 Collaboration ; Ignatov, F V ; Akhmetshin, R R ; Amirkhanov, A N ; Anisenkov, A V ; Aulchenko, V M ; Bashtovoy, N S ; Berkaev, D E ; Bondar, A E ; Bragin, A V ; Eidelman, S I ; Epifanov, D A ; Epshteyn, L B ; Erofeev, A L ; Fedotovich, G V ; Gorkovenko, A O ; Grancagnolo, F J ; Grebenuk, A A ; Gribanov, S S ; Grigoriev, D N ; Ivanov, V L ; Karpov, S V ; Kasaev, A S ; Kazanin, V F ; Khazin, B I ; Kirpotin, A N ; Koop, I A ; Korobov, A A ; Kozyrev, A N ; Kozyrev, E A ; Krokovny, P P ; Kuzmenko, A E ; Kuzmin, A S ; Logashenko, I B ; Lukin, P A ; Lysenko, A P ; K Yu Mikhailov ; Obraztsov, I V ; Okhapkin, V S ; Otboev, A V ; Perevedentsev, E A ; Pestov, Yu N ; Popov, A S ; Razuvaev, G P ; Rogovsky, Yu A ; Ruban, A A ; Ryskulov, N M ; Ryzhenenkov, A E ; Semenov, A V ; Senchenko, A I ; P Yu Shatunov ; Shatunov, Yu M ; Shebalin, V E ; Shemyakin, D N ; Shwartz, B A ; Shwartz, D B ; Sibidanov, A L ; Solodov, E P ; Talyshev, A A ; Timoshenko, M V ; Titov, V M ; Tolmachev, S S ; Vorobiov, A I ; Zemlyansky, I M ; Zhadan, D S ; Zharinov, Yu M ; Zubakin, A S ; Yudin, Yu V
Assuntos: Cross-sections ; Energy resolution ; Luminosity ; Magnetic moments ; Resonance
É parte de: arXiv.org, 2024-06
Descrição: The cross section of the process \(e^+e^-\to\pi^+\pi^-\) has been measured in the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on a full dataset collected below 1 GeV during three data taking seasons, corresponding to an integrated luminosity of about 62 pb\(^{-1}\). In the dominant \(\rho\)-resonance region, a systematic uncertainty of 0.7% has been reached. At energies around \(\phi\)-resonance the \(\pi^+\pi^-\) production cross section was measured for the first time with high beam energy resolution. The forward-backward charge asymmetry in the \(\pi^+\pi^-\) production has also been measured. It shows a strong deviation from the theoretical prediction based on the conventional scalar quantum electrodynamics framework, and it is in good agreement with the generalized vector-meson-dominance and dispersive-based predictions. The impact of the presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed.
Editor: Ithaca: Cornell University Library, arXiv.org
Idioma: Inglês

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Measurement of the \(e^+e^-\to\pi^+\pi^-\) cross section from threshold to 1.2 GeV with the CMD-3 detector

Ithaca: Cornell University Library, arXiv.org

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