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Measurement of the $e^+e^-\toπ^+π^-π^0$ cross section in the energy region from 0.56 to 1.1 GeV with the SND detector

Fuente: arXiv

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Hauptverfasser:	SND Collaboration, Achasov, M. N., Alizzi, A. E., Barnyakov, A. Yu., Beloborodov, K. I., Berdyugin, A. V., Berkaev, D. E., Bogdanchikov, A. G., Botov, A. A., Denisov, V. S., Dimova, T. V., Druzhinin, V. P., Efremov, R. A., Eminov, E. A., Fomin, L. B., Kardapoltsev, L. V., Kattsin, A. A., Kharlamov, A. G., Koop, I. A., Korol, A. A., Kovrizhin, D. P., Kupich, A. S., Kryukov, A. P., Melnikova, N. A., Muchnoi, N. Yu., Obrazovsky, A. E., Oorzhak, A. A., Ovtin, I. V., Pakhtusova, E. V., Perevedentsev, E. A., Polomoshnov, I. A., Pugachev, K. V., Rogovsky, Yu. A., Romanov, V. A., Serednyakov, S. I., Shatunov, Yu. M., Shtol, D. A., Silagadze, Z. K., Sungurov, K. D., Timoshenko, M. V., Surin, I. K., Usov, Yu. V., Zemlyansky, I. M., Zhabin, V. N., Zharinov, Yu. M., Zhulanov, V. V., Zhulanova, P. V.
Format:	Preprint
Veröffentlicht:	2026
Schlagworte:	High Energy Physics - Experiment
Online-Zugang:	Acceder al recurso
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_version_	1866912943022538752
author	SND Collaboration Achasov, M. N. Alizzi, A. E. Barnyakov, A. Yu. Beloborodov, K. I. Berdyugin, A. V. Berkaev, D. E. Bogdanchikov, A. G. Botov, A. A. Denisov, V. S. Dimova, T. V. Druzhinin, V. P. Efremov, R. A. Eminov, E. A. Fomin, L. B. Kardapoltsev, L. V. Kattsin, A. A. Kharlamov, A. G. Koop, I. A. Korol, A. A. Kovrizhin, D. P. Kupich, A. S. Kryukov, A. P. Melnikova, N. A. Muchnoi, N. Yu. Obrazovsky, A. E. Oorzhak, A. A. Ovtin, I. V. Pakhtusova, E. V. Perevedentsev, E. A. Polomoshnov, I. A. Pugachev, K. V. Rogovsky, Yu. A. Romanov, V. A. Serednyakov, S. I. Shatunov, Yu. M. Shtol, D. A. Silagadze, Z. K. Sungurov, K. D. Timoshenko, M. V. Surin, I. K. Usov, Yu. V. Zemlyansky, I. M. Zhabin, V. N. Zharinov, Yu. M. Zhulanov, V. V. Zhulanova, P. V.
author_facet	SND Collaboration Achasov, M. N. Alizzi, A. E. Barnyakov, A. Yu. Beloborodov, K. I. Berdyugin, A. V. Berkaev, D. E. Bogdanchikov, A. G. Botov, A. A. Denisov, V. S. Dimova, T. V. Druzhinin, V. P. Efremov, R. A. Eminov, E. A. Fomin, L. B. Kardapoltsev, L. V. Kattsin, A. A. Kharlamov, A. G. Koop, I. A. Korol, A. A. Kovrizhin, D. P. Kupich, A. S. Kryukov, A. P. Melnikova, N. A. Muchnoi, N. Yu. Obrazovsky, A. E. Oorzhak, A. A. Ovtin, I. V. Pakhtusova, E. V. Perevedentsev, E. A. Polomoshnov, I. A. Pugachev, K. V. Rogovsky, Yu. A. Romanov, V. A. Serednyakov, S. I. Shatunov, Yu. M. Shtol, D. A. Silagadze, Z. K. Sungurov, K. D. Timoshenko, M. V. Surin, I. K. Usov, Yu. V. Zemlyansky, I. M. Zhabin, V. N. Zharinov, Yu. M. Zhulanov, V. V. Zhulanova, P. V.
contents	The precise measurement of the $e^+e^-\toπ^+π^-π^0$ cross section is performed in the center-of-mass energy range $E = 560$--1100 MeV using a data sample of 66 pb$^{-1}$ collected in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider. The systematic uncertainty of the cross section measurement is 0.9\% at the maximum of the $ω$ resonance and 1.2\% at the maximum of the $ϕ$ resonance. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the $e^+e^-\toπ^+π^-π^0$ cross section measured by SND from 0.62 to 1.975 GeV is $(45.95\pm0.06\pm 0.46)\times 10^{-10}$. From the fit to the cross section data with the vector meson dominance model, the parameters of the $ω$, $ρ$, and $ϕ$ resonances are obtained. The obtained values of ${\cal B}(ω\to e^+e^-) {\cal B}(ω\to 3π)$, mass and width of the $ω$ meson, and ${\cal B}(ρ\to 3π)$ have accuracy better than the current world average values.
format	Preprint
id	arxiv_https___arxiv_org_abs_2603_01635
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Measurement of the $e^+e^-\toπ^+π^-π^0$ cross section in the energy region from 0.56 to 1.1 GeV with the SND detector SND Collaboration Achasov, M. N. Alizzi, A. E. Barnyakov, A. Yu. Beloborodov, K. I. Berdyugin, A. V. Berkaev, D. E. Bogdanchikov, A. G. Botov, A. A. Denisov, V. S. Dimova, T. V. Druzhinin, V. P. Efremov, R. A. Eminov, E. A. Fomin, L. B. Kardapoltsev, L. V. Kattsin, A. A. Kharlamov, A. G. Koop, I. A. Korol, A. A. Kovrizhin, D. P. Kupich, A. S. Kryukov, A. P. Melnikova, N. A. Muchnoi, N. Yu. Obrazovsky, A. E. Oorzhak, A. A. Ovtin, I. V. Pakhtusova, E. V. Perevedentsev, E. A. Polomoshnov, I. A. Pugachev, K. V. Rogovsky, Yu. A. Romanov, V. A. Serednyakov, S. I. Shatunov, Yu. M. Shtol, D. A. Silagadze, Z. K. Sungurov, K. D. Timoshenko, M. V. Surin, I. K. Usov, Yu. V. Zemlyansky, I. M. Zhabin, V. N. Zharinov, Yu. M. Zhulanov, V. V. Zhulanova, P. V. High Energy Physics - Experiment The precise measurement of the $e^+e^-\toπ^+π^-π^0$ cross section is performed in the center-of-mass energy range $E = 560$--1100 MeV using a data sample of 66 pb$^{-1}$ collected in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider. The systematic uncertainty of the cross section measurement is 0.9\% at the maximum of the $ω$ resonance and 1.2\% at the maximum of the $ϕ$ resonance. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the $e^+e^-\toπ^+π^-π^0$ cross section measured by SND from 0.62 to 1.975 GeV is $(45.95\pm0.06\pm 0.46)\times 10^{-10}$. From the fit to the cross section data with the vector meson dominance model, the parameters of the $ω$, $ρ$, and $ϕ$ resonances are obtained. The obtained values of ${\cal B}(ω\to e^+e^-) {\cal B}(ω\to 3π)$, mass and width of the $ω$ meson, and ${\cal B}(ρ\to 3π)$ have accuracy better than the current world average values.
title	Measurement of the $e^+e^-\toπ^+π^-π^0$ cross section in the energy region from 0.56 to 1.1 GeV with the SND detector
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2603.01635