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1. Experimental study of the $$e^+e^-\rightarrow n{\bar{n}}$$ e + e - → n n ¯ process at the VEPP-2000 $$e^+e^-$$ e + e - collider with the SND detector

Author

SND Collaboration, M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, G. S. Chizhik, T. V. Dimova, V. P. Druzhinin, L. V. Kardapoltsev, A. G. Kharlamov, V. A. Kladov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, A. P. Lysenko, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, S. I. Serednyakov, Z. K. Silagadze, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, I. K. Surin, Yu. V. Usov, I. M. Zemlyansky, V. N. Zhabin, and V. V. Zhulanov

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The process $$e^+e^-\rightarrow n{\bar{n}}$$ e + e - → n n ¯ is studied in the experiment at the VEPP-2000 $$e^+e^-$$ e + e - collider with the SND detector. The technique of the time measurements in the multichannel NaI(Tl) electromagnetic calorimeter is used to select $$n{\bar{n}}$$ n n ¯ events. The value of the measured cross section in the center-of-mass energy range from 1.894 to 2 GeV varies from 0.5 to 0.35 nb. The effective neutron timelike form factor is derived from the measured cross section and compared with the proton form factor. The ratio of the neutron electric and magnetic form factors is obtained from the analysis of the antineutron polar angle distribution and found to be consistent with unity.

Published
2022
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2. Study of the process $$e^+e^- \rightarrow \eta \eta \gamma $$ e + e - → η η γ in the energy range $$\sqrt{s} = \text{1.17--2.00 }$$ s = 1.17--2.00 GeV with the SND detector

Author

M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, A. N. Kirpotin, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, D. V. Rabusov, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, D. N. Shatilov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu. V. Usov, V. N. Zhabin, V. V. Zhulanov, and SND Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The process $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb $$^{-1}$$ - 1 collected by the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. The $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\phi \eta $$ ϕ η intermediate state. Our result on the $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is consistent with the $$e^+e^-\rightarrow \phi \eta $$ e + e - → ϕ η measurement in the $$\phi \rightarrow K^+ K^-$$ ϕ → K + K - mode. The search for radiative processes contributing to the $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is performed, and no significant signal is observed.

Published
2022
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3. Measurement of the e + e − → π + π − process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < s $$ \sqrt{s} $$ < 0.883 GeV

Author

SND collaboration, M. N. Achasov, A. A. Baykov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, A. P. Lysenko, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, Y. S. Savchenko, S. I. Serednyakov, Z. K. Silagadze, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, I. K. Surin, Yu. V. Usov, I. M. Zemlyansky, and V. N. Zhabin

Subjects
e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The cross section of the process e + e − → π + π − has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 e + e − collider VEPP-2000 in the energy region 525 < s $$ \sqrt{s} $$ < 883 MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb −1. The systematic uncertainty of the cross section determination is 0.8% at s $$ \sqrt{s} $$ > 0.600 GeV. The ρ meson parameters are obtained as m ρ = 775.3 ± 0.5 ± 0.6 MeV, Γ ρ = 145.6 ± 0.6 ± 0.8 MeV, B ρ→e+e− × B ρ→π+π− = (4.89 ± 0.02 ± 0.04) × 10 −5, and the parameters of the e + e − → ω → π + π − process, suppressed by G-parity, as B ω→e+e− × B ω→π+π− = (1.32 ± 0.06 ± 0.02) × 10 −6 and and ϕ ρω = 110.7 ± 1.5 ± 1.0 degrees.

Published
2021
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4. Measurement of the $$e^+e^- \rightarrow K^+ K^- \pi ^0$$ e + e - → K + K - π 0 cross section with the SND detector

Author

M. N. Achasov, A. Yu. Barnyakov, M. Yu. Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, A. R. Buzykaev, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. G. Kharlamov, A. A. Korol, D. P. Kovrizhin, E. A. Kravchenko, A. S. Kupich, A. P. Lysenko, K. A. Martin, N. Yu. Muchnoy, N. A. Melnikova, A. E. Obrazovsky, A. P. Onuchin, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, Y. S. Savchenko, S. I. Serednyakov, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, Z. K. Silagadze, I. K. Surin, Yu. A. Tikhonov, Yu. V. Usov, I. M. Zemlyansky, V. N. Zhabin, and V. V. Zhulanov

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The process $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 is studied with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. Basing on data with an integrated luminosity of 26.4 $$\hbox {pb}^{-1}$$ pb - 1 we measure the $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $$K\pi $$ K π system indicates that the dominant mechanism of this reaction is the transition through the $$K^{*}(892)K$$ K ∗ ( 892 ) K intermediate state. The cross section for the $$\phi \pi ^0$$ ϕ π 0 intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the $$\phi \pi ^0$$ ϕ π 0 and $$K^*K$$ K ∗ K amplitudes. It is found that the interference gives sizable contribution to the measured $$e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$$ e + e - → ϕ π 0 → K + K - π 0 cross section below 1.7 GeV.

Published
2020
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5. Study of the process $$e^+e^- \rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ in the energy range $$\sqrt{s} = {1.05-2.00}$$ s = 1.05 - 2.00 GeV with the SND detector

Author

M. N. Achasov, A. Yu. Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. N. Kirpotin, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, D. V. Rabusov, Yu. A. Rogovsky, Y. S. Savchenko, A. I. Senchenko, S. I. Serednyakov, D. N. Shatilov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu. V. Usov, V. N. Zhabin, and V. V. Zhulanov

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$\hbox {pb}^{-1}$$ pb - 1 collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ e + e - collider. The $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\omega \eta $$ ω η intermediate state. The measured cross section of the subprocess $$e^+e^-\rightarrow \omega \eta \rightarrow \eta \pi ^0\gamma $$ e + e - → ω η → η π 0 γ is consistent with previous measurements in the $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0\eta $$ e + e - → π + π - π 0 η mode. It is found, with a significance of $$5.6\sigma $$ 5.6 σ , that the process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-\rightarrow a_{0}(1450)\gamma $$ e + e - → a 0 ( 1450 ) γ , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.

Published
2020
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6. Study of dynamics of the process $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0$$ e + e - → π + π - π 0 in the energy range 1.15–2.00 GeV

Author

M. N. Achasov, A. Yu. Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. N. Kirpotin, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, D. V. Rabusov, Yu. A. Rogovsky, Y. S. Savchenko, A. I. Senchenko, S. I. Serednyakov, D. N. Shatilov, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu. V. Usov, V. N. Zhabin, and V. V. Zhulanov

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The dynamics of the process $$ e^+e^- \rightarrow \pi ^+\pi ^-\pi ^0 $$ e + e - → π + π - π 0 is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. The Dalitz plot distribution and $$\pi ^+\pi ^-$$ π + π - mass spectrum are analyzed in a model including the intermediate states $$\rho (770)\pi $$ ρ ( 770 ) π , $$\rho (1450)\pi $$ ρ ( 1450 ) π , and $$\omega \pi ^0$$ ω π 0 . As a result, the energy dependences of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π cross sections and the relative phases between the $$\rho (770)\pi $$ ρ ( 770 ) π amplitude and the $$\rho (1450)\pi $$ ρ ( 1450 ) π and $$\omega \pi ^0$$ ω π 0 amplitudes are obtained. The $$\rho (1450)\pi $$ ρ ( 1450 ) π cross section has a peak in the energy region of the $$\omega (1650)$$ ω ( 1650 ) resonance (1.55–1.75 GeV). In this energy range the contributions of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the $$\rho (770)\pi $$ ρ ( 770 ) π cross section. We conclude that the intermediate state $$\rho (1450)\pi $$ ρ ( 1450 ) π gives a significant contribution to the decay of $$\omega (1650)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1650 ) → π + π - π 0 , whereas the $$\rho (770)\pi $$ ρ ( 770 ) π mechanism dominates in the decay $$\omega (1420)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1420 ) → π + π - π 0 .

Published
2020
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7. Measurement of the Neutron Timelike Electromagnetic form Factors at the VEPP-2000 e+e– Collider with the SND Detector

Author

M. N. Achasov, A. Yu. Barnyakov, A. A. Baykov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. G. Kharlamov, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, Ya. S. Savchenko, S. I. Serednyakov, D. A. Shtol, Z. K. Silagadze, I. K. Surin, Yu. V. Usov, V. N. Zhabin, and V. V. Zhulanov

Subjects
Nuclear and High Energy Physics
Published
2022

8. Study of the Process $${e}^{{+}}{e}^{{-}}{\to}{\eta\pi}^{{0}}{\gamma}$$ in the Cossision-Energy Range of $$\sqrt{{s}}{=}{1.05{-}2.00}$$ GeV

Author

V. P. Druzhinin, Aleksandr Korol, K. A. Martin, A. S. Kupich, V. B. Golubev, K. V. Pugachev, N. A. Melnikova, A. V. Berdyugin, S. I. Serednyakov, V. N. Zhabin, E. V. Pakhtusova, A. A. Botov, Alexander Bogdanchikov, I. K. Surin, N. Yu. Muchnoi, A. Yu. Barnyakov, Konstantin Beloborodov, D. A. Shtol, A. A. Baykov, Yu. V. Usov, L. V. Kardapoltsev, A. E. Obrazovsky, M. N. Achasov, T. V. Dimova, D. P. Kovrizhin, Alexey Kharlamov, Y. S. Savchenko, and Z. K. Silagadze

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Hadron, Type (model theory), 01 natural sciences, Omega, Atomic and Molecular Physics, and Optics, Luminosity, law.invention, law, 0103 physical sciences, Intermediate state, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider, Energy (signal processing)
Abstract

The process $$e^{+}e^{-}\to\eta\pi^{0}\gamma$$ is studied in the range of center-of-mass (c.m.) collision energies between 1.05 and 2.00 GeV on the basis of data corresponding to an integrated luminosity of 94.5 pb $${}^{-1}$$ that were accumulated in an experiment with the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ collider. The cross section for this process was measured for the first time and was found to receive a dominant contribution from the mechanism of a transition through an $$\omega\eta$$ intermediate state. The cross section measured for the process $$e^{+}e^{-}\to\omega\eta\to\eta\pi^{0}\gamma$$ agrees with the results of earlier measurements in the channel $$e^{+}e^{-}\to\pi^{+}\pi^{-}\pi^{0}\eta$$ . At a level of 5.7 standard deviations (5.7 $$\sigma$$ ), it is established that the process $$e^{+}e^{-}\to\eta\pi^{0}\gamma$$ is not fully described by hadronic intermediate states of the $$VP$$ type. The cross section was measured for this missing contribution, which may be generated by radiative processes—for example, $$e^{+}e^{-}\to a_{0}(1450)\gamma$$ . It ranges from 15 to 20 pb over a broad energy interval extending from 1.3 to 1.9 GeV.

Published
2021

9. Measurement of the Cross Section for the Process $${e^{+}e^{-}}{\to}{K}^{{+}}{K}^{{-}}{\pi}^{{0}}$$ with the SND Detector at Collision Energies of $$\sqrt{{s}}{=}{1.3{-}2.0}$$ GeV in the Center-of-Mass Frame

Author

L. V. Kardapoltsev, M. N. Achasov, V. P. Druzhinin, Aleksandr Korol, T. V. Dimova, Z. K. Silagadze, Alexey Kharlamov, A. A. Botov, S. I. Serednyakov, A. V. Berdyugin, K. V. Pugachev, A. E. Obrazovsky, D. P. Kovrizhin, A. R. Buzykaev, Konstantin Beloborodov, E. V. Pakhtusova, I. K. Surin, E. A. Kravchenko, N. A. Melnikova, A. Yu. Barnyakov, A. P. Onuchin, V. B. Golubev, Alexander Bogdanchikov, K. A. Martin, A. S. Kupich, M.Yu. Barnyakov, D. A. Shtol, and Yu. V. Usov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Center-of-momentum frame, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, BaBar experiment, Collision, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Cross section (physics), law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider
Abstract

In an experiment with the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ collider, the cross sections for the processes $$e^{+}e^{-}\to K^{+}K^{-}\pi^{0}$$ and $$e^{+}e^{-}\to\phi\pi^{0}$$ were measured at collision energies of $$\sqrt{s}=1.28{-}2.00$$ GeV in the center-of-mass frame. The results agree with the results of earlier measurements in the BABAR experiment and have a commensurate precision.

Published
2021

10. Study of e+e- annihilation to hadrons with SND at VEPP-2000

Author

Vladimir P. Druzhinin, Mikhail N. Achasov, A. Yu Barnyakov, K. I Beloborodov, A. V Berdyugin, A. G Bogdanchikov, A. A Botov, Tatiana V. Dimova, L. V Kardapoltsev, A. G Kharlamov, Alexander A. Korol, D. P Kovrizhin, A. S Kupich, N. A Melnikova, A. E Obrazovsky, Elena V. Pakhtusova, K. V Pugachev, S. I Serednyakov, D. A Shtol, Zurab K. Silagadze, I. K Surin, Yu. V Usov, and V. N Zabin

Published
2022

11. Study of the Dynamics of the Process $${e}^{{+}}{e}^{{-}}{\to}{\pi}^{{+}}{\pi}^{{-}}{\pi}^{{0}}$$ in the Energy Range between 1.15 and 2.00 GeV

Author

L. V. Kardapoltsev, D. A. Shtol, M. N. Achasov, S. I. Serednyakov, Alexander Bogdanchikov, I. K. Surin, E. V. Pakhtusova, V. V. Zhulanov, K. A. Martin, A. S. Kupich, T. V. Dimova, K. V. Pugachev, Alexey Kharlamov, Aleksandr Korol, Z. K. Silagadze, V. P. Druzhinin, N. Yu. Muchnoi, V. N. Zhabin, Yu. V. Usov, A. V. Berdyugin, D. P. Kovrizhin, Konstantin Beloborodov, A. Yu. Barnyakov, A. A. Baykov, V. B. Golubev, A. A. Botov, N. A. Melnikova, A. E. Obrazovsky, and Y. S. Savchenko

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, 01 natural sciences, Omega, Atomic and Molecular Physics, and Optics, Spectral line, law.invention, law, Excited state, 0103 physical sciences, Pi, Intermediate state, High Energy Physics::Experiment, 010306 general physics, Collider, Energy (signal processing)
Abstract

Using the SND detector, the process $$e^{+}e^{-}\to\pi^{+}\pi^{-}\pi^{0}$$ was studied in the energy range between 1.05 and 2.00 GeV. The respective measurement was performed on the basis of data accumulated in the experiments at the VEPP-2000 electron–positron collider throughout the runs of 2011 and 2012. Also, the invariant-mass spectra of the $$\pi^{+}\pi^{-}$$ and $$\pi^{\pm}\pi^{0}$$ combinations were analyzed in the energy range between 1.15 and 2 GeV. This resulted in finding an indication that the $$\omega(1680)$$ excited state decayed predominantly through the $$\rho^{\prime}\pi$$ intermediate state.

Published
2020

12. Measurement of the e+e− → π+π− process cross section with the SND detector at the VEPP-2000 collider in the energy region 0.525 < $$ \sqrt{s} $$ < 0.883 GeV

Author

A. Yu. Barnyakov, E. V. Pakhtusova, K. A. Martin, N. Yu. Muchnoi, N. A. Melnikova, P. Yu. Shatunov, A. E. Obrazovsky, Aleksandr Korol, V. B. Golubev, D. A. Shtol, Yu. M. Shatunov, A. V. Berdyugin, A. A. Baykov, Yu. V. Usov, Alexander Bogdanchikov, A. P. Lysenko, D. B. Shwartz, A. A. Botov, A.S. Kupich, I. M. Zemlyansky, L. V. Kardapoltsev, E.A. Perevedentsev, M. N. Achasov, D.E. Berkaev, Alexey Kharlamov, Y. S. Savchenko, T. V. Dimova, Z. K. Silagadze, I. A. Koop, V. N. Zhabin, I. K. Surin, D. P. Kovrizhin, K. V. Pugachev, V. P. Druzhinin, Konstantin Beloborodov, and S. I. Serednyakov

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Luminosity (scattering theory), Meson, Detector, e +-e − Experiments, High Energy Physics - Experiment, law.invention, Cross section (geometry), Nuclear physics, law, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Collider, VEPP-2000, Energy (signal processing)
Abstract

The cross section of the process e+e− → π+π− has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 e+e− collider VEPP-2000 in the energy region 525 <$$ \sqrt{s} $$ s < 883 MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb−1. The systematic uncertainty of the cross section determination is 0.8% at $$ \sqrt{s} $$ s > 0.600 GeV. The ρ meson parameters are obtained as mρ = 775.3 ± 0.5 ± 0.6 MeV, Γρ = 145.6 ± 0.6 ± 0.8 MeV, Bρ→e+e− × Bρ→π+π− = (4.89 ± 0.02 ± 0.04) × 10−5, and the parameters of the e+e− → ω → π+π− process, suppressed by G-parity, as Bω→e+e− × Bω→π+π− = (1.32 ± 0.06 ± 0.02) × 10−6 and and ϕρω = 110.7 ± 1.5 ± 1.0 degrees.

Published
2021

13. Measurement of the $$e^+e^- \rightarrow K^+ K^- \pi ^0$$ cross section with the SND detector

Author

V. B. Golubev, Yu. M. Shatunov, L. V. Kardapoltsev, M. N. Achasov, M.Yu. Barnyakov, D. A. Shtol, N. A. Melnikova, D. B. Shwartz, S. I. Serednyakov, A. A. Botov, E. V. Pakhtusova, V. N. Zhabin, V. V. Zhulanov, E. A. Kravchenko, N. Yu. Muchnoy, I. K. Surin, Z. K. Silagadze, A. P. Onuchin, Aleksandr Korol, A. A. Baykov, E.A. Perevedentsev, A. P. Lysenko, A. E. Obrazovsky, T. V. Dimova, K. V. Pugachev, Y. S. Savchenko, A.Yu. Barnyakov, Alexey Kharlamov, V. P. Druzhinin, Yu. V. Usov, Yu. A. Tikhonov, I. M. Zemlyansky, Konstantin Beloborodov, D.E. Berkaev, P. Yu. Shatunov, K. A. Martin, A. S. Kupich, A. V. Berdyugin, Alexander Bogdanchikov, D. P. Kovrizhin, and A. R. Buzykaev

Subjects
010302 applied physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, BaBar experiment, 01 natural sciences, law.invention, Luminosity, Amplitude, law, 0103 physical sciences, Pi, Mass spectrum, Intermediate state, Collider, Engineering (miscellaneous), Energy (signal processing)
Abstract

The process $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 is studied with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. Basing on data with an integrated luminosity of 26.4 $$\hbox {pb}^{-1}$$ pb - 1 we measure the $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $$K\pi $$ K π system indicates that the dominant mechanism of this reaction is the transition through the $$K^{*}(892)K$$ K ∗ ( 892 ) K intermediate state. The cross section for the $$\phi \pi ^0$$ ϕ π 0 intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the $$\phi \pi ^0$$ ϕ π 0 and $$K^*K$$ K ∗ K amplitudes. It is found that the interference gives sizable contribution to the measured $$e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$$ e + e - → ϕ π 0 → K + K - π 0 cross section below 1.7 GeV.

Published
2020

14. Study of the process $$e^+e^- \rightarrow \eta \pi ^0\gamma $$ in the energy range $$\sqrt{s} = {1.05-2.00}$$ GeV with the SND detector

Author

A. A. Botov, V. V. Zhulanov, I. A. Koop, Alexey Kharlamov, A. N. Kirpotin, D. A. Shtol, T. V. Dimova, D.E. Berkaev, V. B. Golubev, Yu. M. Shatunov, S. I. Serednyakov, A. I. Senchenko, Konstantin Beloborodov, L. V. Kardapoltsev, Yu. V. Usov, M. N. Achasov, A. A. Baykov, V. P. Druzhinin, Yu. A. Rogovsky, A. E. Obrazovsky, Z. K. Silagadze, E. V. Pakhtusova, K. V. Pugachev, Aleksandr Korol, N. Yu. Muchnoy, Dmitrii Rabusov, V. N. Zhabin, N. A. Melnikova, A.Yu. Barnyakov, A.S. Kasaev, A. V. Berdyugin, I. K. Surin, Dmitry Shatilov, D. B. Shwartz, Alexander Bogdanchikov, Maxim Timoshenko, K. A. Martin, A. S. Kupich, D. P. Kovrizhin, and Y. S. Savchenko

Subjects
Physics, Range (particle radiation), Particle physics, Physics and Astronomy (miscellaneous), Hadron, Omega, law.invention, Luminosity, law, Pi, Intermediate state, Collider, Engineering (miscellaneous), Energy (signal processing)
Abstract

The process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$\hbox {pb}^{-1}$$ pb - 1 collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ e + e - collider. The $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\omega \eta $$ ω η intermediate state. The measured cross section of the subprocess $$e^+e^-\rightarrow \omega \eta \rightarrow \eta \pi ^0\gamma $$ e + e - → ω η → η π 0 γ is consistent with previous measurements in the $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0\eta $$ e + e - → π + π - π 0 η mode. It is found, with a significance of $$5.6\sigma $$ 5.6 σ , that the process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-\rightarrow a_{0}(1450)\gamma $$ e + e - → a 0 ( 1450 ) γ , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.

Published
2020

15. Study of $e^+e^-$ annihilation into hadrons with the SND detector at the VEPP-2000 collider

Author

Vladimir P. Druzhinin, Mikhail N. Achasov, Alexander Yu. Barnyakov, Alexander A. Baykov, Konstantin I. Beloborodov, Aleksey Berdyugin, Alexander G. Bogdanchikov, Alexander A. Botov, Tatiana V. Dimova, Vladimir B. Golubev, Leonid V. Kardapoltsev, Alexey Kharlamov, Alexander A. Korol, Dmitry P. Kovrizhin, Andrey S. Kupich, Roman A. Litvinov, Karina A. Martin, Natalya A. Melnikova, Alexander E. Obrazovsky, Elena V. Pakhtusova, Konstantin V. Pugachev, Sergey I. Serednyakov, Dmitry A Shtol, Zurab K. Silagadze, Ilya K. Surin, Yury V. Usov, and Victor N. Zhabin

Subjects
Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, Hadron, law.invention, Nuclear physics, law, Excited state, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, Collider, VEPP-2000
Abstract

We present recent results on study of exclusive processes of $e^+e^-$ annihilation into hadrons with the SND detector. Data were collected at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range from 0.3 to 2 GeV. In particular, we have measured the cross sections for $e^+e^-\to\pi^+\pi^-$ and $n\bar{n}$, studied the radiative decays of excited light vector mesons to $\pi^0\gamma$ and $\eta\pi^0\gamma$, and performed a search for the rare processes of $e^+e^-$ annihilation into $C$-even resonances $\eta$ and $f_1(1285)$.

Published
2020

16. Study of dynamics of the process $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0$$ in the energy range 1.15–2.00 GeV

Author

S. I. Serednyakov, Z. K. Silagadze, A.S. Kasaev, I. A. Koop, D. A. Shtol, I. K. Surin, Yu. V. Usov, N. A. Melnikova, A.Yu. Barnyakov, Aleksandr Korol, Dmitry Shatilov, A. A. Botov, D.E. Berkaev, A. A. Baykov, D. B. Shwartz, V. B. Golubev, K. V. Pugachev, Yu. M. Shatunov, Maxim Timoshenko, A. I. Senchenko, D. P. Kovrizhin, Konstantin Beloborodov, A. N. Kirpotin, K. A. Martin, V. V. Zhulanov, Alexey Kharlamov, A. S. Kupich, Dmitrii Rabusov, Yu. A. Rogovsky, E. V. Pakhtusova, A. E. Obrazovsky, Y. S. Savchenko, N. Yu. Muchnoy, Alexander Bogdanchikov, A. V. Berdyugin, V. P. Druzhinin, V. N. Zhabin, T. V. Dimova, L. V. Kardapoltsev, and M. N. Achasov

Subjects
Physics, Particle physics, Range (particle radiation), Physics and Astronomy (miscellaneous), Pi, Intermediate state, Dalitz plot, Engineering (miscellaneous), Omega, Energy (signal processing)
Abstract

The dynamics of the process $$ e^+e^- \rightarrow \pi ^+\pi ^-\pi ^0 $$ e + e - → π + π - π 0 is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. The Dalitz plot distribution and $$\pi ^+\pi ^-$$ π + π - mass spectrum are analyzed in a model including the intermediate states $$\rho (770)\pi $$ ρ ( 770 ) π , $$\rho (1450)\pi $$ ρ ( 1450 ) π , and $$\omega \pi ^0$$ ω π 0 . As a result, the energy dependences of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π cross sections and the relative phases between the $$\rho (770)\pi $$ ρ ( 770 ) π amplitude and the $$\rho (1450)\pi $$ ρ ( 1450 ) π and $$\omega \pi ^0$$ ω π 0 amplitudes are obtained. The $$\rho (1450)\pi $$ ρ ( 1450 ) π cross section has a peak in the energy region of the $$\omega (1650)$$ ω ( 1650 ) resonance (1.55–1.75 GeV). In this energy range the contributions of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the $$\rho (770)\pi $$ ρ ( 770 ) π cross section. We conclude that the intermediate state $$\rho (1450)\pi $$ ρ ( 1450 ) π gives a significant contribution to the decay of $$\omega (1650)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1650 ) → π + π - π 0 , whereas the $$\rho (770)\pi $$ ρ ( 770 ) π mechanism dominates in the decay $$\omega (1420)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1420 ) → π + π - π 0 .

Published
2020

17. Recent results from SND experiment at the VEPP-2000 collider

Author

S. I. Serednyakov, A. E. Obrazovsky, Aleksandr Korol, K. A. Martin, A. S. Kupich, K. V. Pugachev, V. B. Golubev, Dmitry Shtol, D. P. Kovrizhin, A.Yu. Barnyakov, A. A. Botov, N. A. Melnikova, Alexander Bogdanchikov, R. A. Litvinov, V. P. Druzhinin, Z. K. Silagadze, Y. S. Savchenko, A. A. Baykov, Alexey Kharlamov, E. V. Pakhtusova, Y. Usov, V. V. Zulanov, I. K. Surin, Konstantin Beloborodov, T. V. Dimova, L. V. Kardapoltsev, M. N. Achasov, V. N. Zabin, and A. V. Berdyugin

Subjects
Nuclear physics, Physics, law, Collider, VEPP-2000, law.invention
Published
2020

18. Recent Results from the SND Detector

Author

Tatyana Dimova, D. P. Kovrizhin, A. E. Obrazovsky, Konstantin Beloborodov, A.Yu. Barnyakov, V. P. Druzhinin, Aleksandr Korol, Alexander Bogdanchikov, L.V. Kardapoltsev, Z. K. Silagadze, I. K. Surin, N. Yu. Muchnoy, N. A. Melnikova, S.V. Koshuba, V. N. Zhabin, Alexey Kharlamov, A. V. Berdyugin, D. A. Shtol, V. G. Golubev, M. N. Achasov, Sergey Serednyakov, and A. A. Botov

Subjects
Physics, Nuclear and High Energy Physics, Crystallography, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Hadron, Elementary particle, 010306 general physics, 01 natural sciences, Omega, Energy (signal processing)
Abstract

Presented are recent results of experiments on the SND detector. Data were collected on the VEPP-2000 and VEPP-2M $${{e}^{ + }}{{e}^{ - }}$$ colliders (Novosibirsk) in the c.m. energy region 0.3–2.0 GeV. Integrated luminusity used is 70 and 25 pb–1 respectively. Cross section of the $${{e}^{ + }}{{e}^{ - }} \to {{\pi }^{0}}\gamma ,$$ $${{e}^{ + }}{{e}^{ - }} \to {{\pi }^{ + }}{{\pi }^{ - }}{{\pi }^{0}}\eta ,$$ $${{e}^{ + }}{{e}^{ - }} \to \omega \eta {{\pi }^{0}}$$ processes is measured.

Published
2018

19. Study of e+e− annihilation to hadrons with SND at the VEPP-2000 collider

Author

E. V. Pakhtusova, Konstantin Beloborodov, S. V. Koshuba, D. A. Shtol, A. V. Berdyugin, Z. K. Silagadze, V. N. Zhabin, A. E. Obrazovsky, S. I. Serednyakov, A.S. Kupich, V. V. Zhulanov, A.Yu. Barnyakov, V. B. Golubev, L. V. Kardapoltsev, A.V. Vasiljev, Alexander Bogdanchikov, M. N. Achasov, T. V. Dimova, D. P. Kovrizhin, R. A. Litvinov, A. A. Botov, Aleksandr Korol, Y. Usov, K. V. Pugachev, L.A. Korneev, N. A. Melnikova, I. K. Surin, Alexey Kharlamov, V. P. Druzhinin, and K.A. Martin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, 01 natural sciences, law.invention, Nuclear physics, Positron, law, 0103 physical sciences, 010306 general physics, Collider, VEPP-2000
Abstract

In 2017 the detector SND resumed data taking at the VEPP-2000 e + e − collider after its upgrade. Using of a new positron source allows significantly increase collider luminosity. We report the current status of the experiment and recent result of data analysis, in particular, on the processes e + e − → π + π − , n n ‾ , K + K − η , π + π − η , K S K L π 0 , π + π − π 0 η , π 0 γ , ω π 0 , and η → e + e − .

Published
2018

20. Measurement of the e+e− → ηK+K− Cross Section by Means of the SND Detector

Author

Alexey Kharlamov, D. P. Kovrizhin, A. V. Surin, Yu. M. Shatunov, T. V. Dimova, A.V. Vasiljev, E. V. Pakhtusova, P. Yu. Shatunov, A.N. Skrinsky, Konstantin Beloborodov, A. P. Lysenko, Yu. A. Tikhonov, D. A. Shtol, S. I. Serednyakov, Y. Usov, Alexey Buzykaev, Aleksandr Korol, A.Yu. Barnyakov, A. P. Onuchin, Ilya Zemlyansky, A. E. Obrazovsky, V. P. Druzhinin, E.A. Perevedentsev, S.V. Koshuba, Z. K. Silagadze, V. B. Golubev, N. A. Melnikova, A. A. Botov, E. A. Kravchenko, Alexander Bogdanchikov, K. V. Pugachev, L. V. Kardapoltsev, M. N. Achasov, A. V. Berdyugin, K. A. Martin, A. S. Kupich, and M.Yu. Barnyakov

Subjects
Physics, Nuclear and High Energy Physics, Meson, Mass distribution, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Hadron, Detector, Elementary particle, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, 0103 physical sciences, Intermediate state, High Energy Physics::Experiment, 010306 general physics, Collider, Boson
Abstract

The cross section for the process e+e− → ηK+K− wasmeasured at c.m. energies in the range between 1.56 and 2.00 GeV in an experiment with the SND detector at the VEPP-2000 e+e− collider. The invariant-mass distribution of kaon pairs is consistent with the hypothesis that the transition through the ηφ intermediate state makes a dominant contribution to the transition in question.

Published
2018

21. Energy dependence of the cross sections for the e+e– → hadrons process near the production threshold for the N N̄ pair

Author

S. I. Serednyakov and A. E. Obrazovsky

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Omega baryon, 01 natural sciences, Atomic and Molecular Physics, and Optics, Pion, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Lepton
Abstract

The energy dependence of the cross sections for the processes e+e− → π+π−π0, K+K−, ηπ+π−, ωπ0, and K+K−π+π− is studied near the production threshold for a nucleon–antinucleon pair. It is shown that, within the measurement errors, the cross sections in question behave smoothly in this energy region.

Published
2017

22. Recent results from SND detector at VEPP-2000 collider

Author

E. V. Pakhtusova, S. I. Serednyakov, A.V. Vasiljev, V. B. Golubev, A.S. Kupich, T. V. Dimova, A.Yu. Barnyakov, V. P. Druzhinin, D. A. Shtol, A. E. Obrazovsky, I. K. Surin, L. V. Kardapoltsev, Aleksandr Korol, A. V. Berdyugin, M. N. Achasov, S.V. Koshuba, K.A. Martin, Alexander Bogdanchikov, Konstantin Beloborodov, Alexey Kharlamov, Z. K. Silagadze, D. P. Kovrizhin, A. A. Botov, and Y. Usov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Vector meson, Positron emission, 010306 general physics, Collider, VEPP-2000
Abstract

Recent results on e + e − annihilation to hadrons from SND experiment at VEPP-2000 and VEPP-2M colliders are presented. Corresponding data set is about 100 pb−1 of integrated luminosity collected at the energy region s below 2 GeV. The processes e + e − → K + K − , π 0 γ , η π + π − π 0 and ω π 0 η have been studied.

Published
2017

23. Study of the $e^+e^-$ annihilation into hadrons with the SND detector at the VEPP-2000 collider

Author

D. P. Kovrizhin, L. V. Kardapoltsev, V. V. Zhulanov, A. A. Botov, M. N. Achasov, V. P. Druzhinin, A. Yu. Barnyakov, Z. K. Silagadze, V. B. Golubev, S. I. Serednyakov, V. N. Zhabin, N. A. Melnikova, T. V. Dimova, R. A. Litvinov, E. V. Pakhtusova, Konstantin Beloborodov, L. A. Korneev, A. V. Vasiljev, Yu. V. Usov, A. V. Berdyugin, Alexey Kharlamov, S. V. Koshuba, K. V. Pugachev, A. A. Korol, K. A. Martin, A. S. Kupich, I. K. Surin, A. E. Obrazovsky, Alexander Bogdanchikov, and D. A. Shtol

Subjects
Physics, Particle physics, Annihilation, Physics::Instrumentation and Detectors, Branching fraction, Hadron, Detector, law.invention, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, VEPP-2000, Bar (unit)
Abstract

Recent results on study of exclusive processes of $e^+e^-$ annihilation into hadrons below 2 GeV obtained at the SND detector are presented. The analysis are based on data collected at the VEPP-2M and VEPP-2000 colliders. In particular, we present the measurements of the $e^+e^-\to\eta\pi^+\pi^-$, $e^+e^-\to\eta K^+K^-$, $e^+e^-\to K_SK_L\pi^0$ cross sections, and the preliminary results on study of the $e^+e^-\to\pi^+\pi^-$, $e^+e^-\to n\bar{n}$, $e^+e^-\to\pi^0\gamma$, and the upper limit for $\eta\to e^+e^-$ decay branching fraction

Published
2019

24. Measurement of the e+e−→π+π−π0η cross section below s=2 GeV

Author

V. B. Golubev, Yu. M. Shatunov, A. E. Obrazovsky, A. A. Botov, Konstantin Beloborodov, N. A. Melnikova, I. K. Surin, T. V. Dimova, A. P. Lysenko, Evgeny Perevedentsev, A. Yu. Barnyakov, Alexey Kharlamov, R. A. Litvinov, D. P. Kovrizhin, Alexander Bogdanchikov, A.N. Skrinsky, V. P. Druzhinin, Dmitry Shtol, A. V. Berdyugin, Yu. A. Tikhonov, K. V. Pugachev, S. V. Koshuba, Ilya Zemlyansky, K. A. Martin, A. S. Kupich, E. V. Pakhtusova, P. Yu. Shatunov, N. Yu. Muchnoy, A. A. Korol, Z. K. Silagadze, L. V. Kardapoltsev, M. N. Achasov, S. I. Serednyakov, and A. V. Vasiljev

Subjects
Cross section (geometry), Physics, Particle physics, law, Electron–positron annihilation, Pi, Intermediate state, High Energy Physics::Experiment, State (functional analysis), Nuclear Experiment, Collider, Omega, law.invention
Abstract

The process $e^+e^- \to \pi^+\pi^-\pi^0\eta$ is studied in the center-of-mass energy region below 2 GeV with the SND detector at the VEPP-2000 $e^+e^-$ collider. The four intermediate states contribute to this process: $\omega\eta$, $\phi\eta$, $a_0(980)\rho$, and a structureless $\pi^+\pi^-\pi^0\eta$ state. We measure the total $e^+e^- \to \pi^+\pi^-\pi^0\eta$ cross section and the cross sections for its components: $\omega\eta$, $\phi\eta$, and a sum of $a_0(980)\rho$ and the structureless state. Our results are in agreement with previous measurements and have comparable or better accuracies.

Published
2019

25. Search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ collisions

Author

T. V. Dimova, K. V. Pugachev, L. V. Kardapoltsev, S. I. Serednyakov, Alexey Kharlamov, A. E. Obrazovsky, A.Yu. Barnyakov, V. B. Golubev, M. N. Achasov, I. A. Koop, Y. Usov, V. P. Druzhinin, E. V. Pakhtusova, A.S. Kasaev, V. V. Zhulanov, P. Yu. Shatunov, N. A. Melnikova, I. K. Surin, A. P. Lysenko, R. A. Litvinov, I. M. Zemlyansky, D. P. Kovrizhin, Z. K. Silagadze, D.E. Berkaev, V. N. Zhabin, Konstantin Beloborodov, E.A. Perevedentsev, A. V. Berdyugin, Yu. M. Shatunov, A.S. Kupich, Dmitry Shtol, A. A. Botov, Alexander Bogdanchikov, K. A. Martin, N. Yu. Muchnoi, Aleksandr Korol, D. B. Shwartz, and S.V. Koshuba

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, 010308 nuclear & particles physics, Branching fraction, Analytical chemistry, Zero (complex analysis), FOS: Physical sciences, Resonance, 01 natural sciences, lcsh:QC1-999, Luminosity, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Direct production, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, lcsh:Physics
Abstract

A search for direct production of the $f_1(1285)$ resonance in $e^+e^-$ annihilation is performed with the SND detector at the VEPP-2000 $e^+e^-$ collider. The analysis is based on data with an integrated luminosity of 15.1 pb$^{-1}$ accumulated in the center-of-mass energy range 1.2--1.4 GeV. Two $e^+e^-\to f_1(1285)$ candidate events are found at the peak of the resonance and zero events beyond the resonance. The significance of the $e^+e^-\to f_1(1285)$ signal is $2.5\sigma$. The cross section at the maximum of the resonance is found to be $\sigma(e^+e^-\to f_1)=45^{+33}_{-24}$ pb. The corresponding branching fraction $B(f_1(1285)\to e^+e^-)=(5.1^{+3.7}_{-2.7})\times 10^{-9}$. We consider this result as a first indication of the process $e^+e^-\to f_1(1285)$. The measured branching fraction is consistent with the theoretical prediction., Comment: 11 pages, 4 figures

Published
2019

26. Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Author

A.A. Korobov, Vassili Kazanin, S.E. Gayazov, A.A. Ruban, K.V. Pugachev, V. B. Golubev, A.E. Kuzmenko, E. V. Pakhtusova, A. N. Kirpotin, A. I. Senchenko, D.N. Shemyakin, V.M. Aulchenko, R.A. Litvinov, F.V. Ignatov, B.A. Shwartz, A.N. Kozyrev, A.S. Kupich, S. I. Serednyakov, A.V. Bragin, A. E. Obrazovsky, A.E. Ryzhenenkov, Aleksandr Korol, R.R. Akhmetshin, Konstantin Beloborodov, Alexey Anisenkov, P. Krokovny, A.Yu. Barnyakov, D.E. Berkaev, V.S. Okhapkin, Alexander Bogdanchikov, S.S. Gribanov, A.L. Erofeev, A.S. Kuzmin, Semen Eidelman, N. A. Melnikova, A. V. Berdyugin, N.S. Bashtovoy, D. B. Shwartz, L. V. Kardapoltsev, A.L. Sibidanov, A.A. Grebenuk, I.B. Logashenko, Yu.N. Pestov, A. A. Botov, S.V. Koshuba, S. S. Tolmachev, V. P. Druzhinin, D.N. Grigoriev, A.S. Popov, M. N. Achasov, A.N. Amirkhanov, S.V. Karpov, L.B. Epshteyn, K. A. Martin, Ilya Zemlyansky, A. V. Otboev, K.Yu. Mikhailov, N.M. Ryskulov, Yu.V. Yudin, T. V. Dimova, A.E. Bondar, Yu. M. Shatunov, G.P. Razuvaev, D.A. Epifanov, D. A. Shtol, I. K. Surin, Alexey Talyshev, E.A. Kozyrev, V.Sh. Banzarov, D.P. Kovrizhin, Alexey Kharlamov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, P.A. Lukin, V.M. Titov, P. Yu. Shatunov, Z. K. Silagadze, G.V. Fedotovich, I. A. Koop, and E. P. Solodov

Subjects
Physics, Particle physics, Muon, 010308 nuclear & particles physics, QC1-999, Electron–positron annihilation, 0103 physical sciences, Hadron, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences, Standard Model
Abstract

Precise study of the hadrons production in \bm{e^+e^-}𝐞+𝐞− annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states. These studies are especially important for theoretical calculations of the muon \bm{(g-2)}(𝐠−2) via the Standard Model because of the present difference between theoretical and experimental values exceeds three standard deviations. In this report we will discuss current status and recent results obtained by the CMD-3 experiment and will give a brief look to status of the BaBar and Belle II experiments.

Published
2019

27. Study of e+e− annihilation to hadrons at the VEPP-2000 collider

Author

Alexey Talyshev, S. I. Serednyakov, A.L. Sibidanov, E.A. Kozyrev, S.V. Koshuba, S.I. Eidelman, F.V. Ignatov, B.A. Shwartz, L. V. Kardapoltsev, K.V. Pugachev, Yu.N. Pestov, A.E. Ryzhenenkov, R.R. Akhmetshin, M. N. Achasov, V. P. Druzhinin, D.N. Grigoriev, V. V. Zhulanov, V.N. Zhabin, G.P. Razuvaev, A.S. Kupich, N. A. Melnikova, N.M. Ryskulov, Aleksandr Korol, R.A. Litvinov, I.B. Logashenko, I. K. Surin, A. E. Obrazovsky, P. Krokovny, A.N. Amirkhanov, A.Yu. Barnyakov, A.S. Popov, S.V. Karpov, Alexander Bogdanchikov, A.E. Bondar, K.A. Martin, V.S. Okhapkin, A.S. Kuzmin, Yu.V. Yudin, K.Yu. Mikhailov, D.A. Epifanov, E. V. Pakhtusova, Konstantin Beloborodov, Alexey Anisenkov, S.E. Gayazov, A.V. Bragin, A.A. Ruban, V.M. Aulchenko, E. P. Solodov, A.N. Kozyrev, A.A. Korobov, D. A. Shtol, A.E. Kuzmenko, Z. K. Silagadze, Vassili Kazanin, V.M. Titov, S.S. Gribanov, A.L. Erofeev, T. V. Dimova, L.B. Epshteyn, D.N. Shemyakin, A. V. Berdyugin, N.S. Bashtovoy, G.V. Fedotovich, Alexey Kharlamov, A.A. Grebenuk, V.Sh. Banzarov, A. A. Botov, D.P. Kovrizhin, A.V. Vasiljev, P.A. Lukin, L.A. Korneev, Y. Usov, V.E. Shebalin, A.I. Vorobiov, V.G. Golubev, and V. L. Ivanov

Subjects
Physics, Annihilation, 010308 nuclear & particles physics, Electron–positron annihilation, QC1-999, Hadron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, 010306 general physics, Collider, VEPP-2000
Abstract

We present current status of the SND and CMD-3 experiments at the VEPP-2000 e+e− collider and recent result of data analysis on the processes $e^+e^-\rightarrow\pi^+\pi^-,n\overline n,\pi^+\pi^-\eta,\pi^+\pi^-\pi^0\eta,K_SK_L\pi^0$, etc.

Published
2019

28. Measurement of the e+e−→π0γ cross section in the energy range 1.075–2 GeV at SND

Author

N. A. Melnikova, V. P. Druzhinin, K. V. Pugachev, K. A. Martin, A. S. Kupich, T. V. Dimova, A. S. Kasaev, Z. K. Silagadze, I. K. Surin, S. V. Koshuba, V. V. Zhulanov, Alexey Kharlamov, A. V. Berdyugin, P. Yu. Shatunov, A. A. Korol, Alexander Bogdanchikov, Yu. V. Usov, L. V. Kardapoltsev, D. P. Kovrizhin, A. I. Senchenko, M. N. Achasov, E. V. Pakhtusova, Dmitry Berkaev, R. A. Litvinov, Dmitry Shtol, Konstantin Beloborodov, A. A. Botov, V. B. Golubev, Yu. M. Shatunov, N. Yu. Muchnoi, A. Yu. Barnyakov, Ivan Koop, A. V. Vasiljev, Yu. A. Rogovsky, D. B. Shwartz, A. E. Obrazovsky, and S. I. Serednyakov

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, Pi, 010306 general physics, Collider, Energy (signal processing)
Abstract

The process e+e-→π0γ is studied with the SND detector at the VEPP-2000 e+e- collider. Basing on data with an integrated luminosity of 41 pb-1 recorded in 2010-2012 we measure the e+e-→π0γ cross section in the center-of-mass energy range from 1.075 up to 2 GeV. In the range 1.4–2.0 GeV the process e+e-→π0γ is studied for the first time.

Published
2018

29. Search for the process e+e−→η

Author

L. V. Kardapoltsev, V. B. Golubev, Yu. M. Shatunov, Alexey Kharlamov, M. N. Achasov, V. V. Zhulanov, Ivan Koop, K. V. Pugachev, S. V. Koshuba, A. Yu. Barnyakov, K. A. Martin, V. P. Druzhinin, A. S. Kupich, D. B. Shwartz, A. V. Vasiljev, E. V. Pakhtusova, A. E. Obrazovsky, A. A. Korol, Dmitry Shtol, R. A. Litvinov, N. A. Melnikova, D. P. Kovrizhin, Dmitry Berkaev, L. A. Korneev, A. A. Botov, A. V. Berdyugin, Dmitry Shatilov, Yu. V. Usov, Konstantin Beloborodov, Alexander Bogdanchikov, Z. K. Silagadze, Yu. A. Rogovsky, V. N. Zhabin, N. Yu. Muchnoi, A. S. Kasaev, A. I. Senchenko, I. K. Surin, Sergey Serednyakov, and T. V. Dimova

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, Inverse, 01 natural sciences, Luminosity, law.invention, law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider, Energy (signal processing)
Abstract

A search for the rare decay $\eta \rightarrow e^+e^-$ is performed using the inverse process $e^+e^- \rightarrow \eta$ in the decay mode $\eta\to\pi^0\pi^0\pi^0 $. We analyze data with an integrated luminosity of 654 nb$^{-1} $ accumulated at the VEPP-2000 $e^+e^-$ collider with the SND detector at the center-of-mass energy $E=m_\eta c ^2\approx 548 $ MeV, and set the upper limit $ {\cal B} (\eta \rightarrow e^+ e^-) < 7 \times 10^{-7} $ at the 90\% confidence level.

Published
2018

30. Measurement of the e+e−→KSKLπ0 cross section in the energy range s=1.3–2.0 GeV

Author

K. A. Martin, A. S. Kupich, A. V. Otboev, A. I. Senchenko, L. V. Kardapoltsev, V. M. Aulchenko, D. B. Shwartz, A. E. Obrazovsky, M. N. Achasov, A. S. Kasaev, Yu. V. Usov, I. K. Surin, N. A. Melnikova, V. B. Golubev, Alexey Kharlamov, Dmitry Berkaev, Yu. M. Shatunov, Alexander Bogdanchikov, K. V. Pugachev, T. V. Dimova, Konstantin Beloborodov, Ivan Koop, Dmitry Shtol, S. I. Serednyakov, A. N. Kirpotin, A. A. Botov, Yu. A. Rogovsky, A. Yu. Barnyakov, E. V. Pakhtusova, A. V. Vasiljev, Z. K. Silagadze, V. P. Druzhinin, D. P. Kovrizhin, L. A. Korneev, A. V. Berdyugin, S. V. Koshuba, and A. A. Korol

Subjects
Physics, Cross section (physics), Particle physics, Range (particle radiation), 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Energy (signal processing), Luminosity
Abstract

The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ cross section is measured in the center-of-mass energy range 1.05--2.00 GeV at the SND detector. The measurement is based on data with an integrated luminosity of $35\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected at the VEPP-2000 ${e}^{+}{e}^{\ensuremath{-}}$-collider. The obtained results are consistent with the previous most accurate data obtained in the BABAR experiment and have a comparable accuracy.

Published
2018

31. Recent results from the SND experiment at VEPP-2000 collider

Author

Z. K. Silagadze, V. B. Golubev, I. K. Surin, Dmitry Shtol, Alexey Kharlamov, A. E. Obrazovsky, A. A. Korol, K. A. Martin, A. A. Botov, A. S. Kupich, Alexander Bogdanchikov, A. Yu. Barnyakov, L. V. Kardapoltsev, A. V. Vasiljev, M. N. Achasov, Yu. V. Usov, D. P. Kovrizhin, A.S. Kupich, S. I. Serednyakov, Konstantin Beloborodov, T. V. Dimova, E. V. Pakhtusova, A. V. Berdyugin, V. P. Druzhinin, and S. V. Koshuba

Subjects
Physics, Particle physics, Annihilation, law, Hadron, High Energy Physics::Experiment, Nuclear Experiment, Collider, VEPP-2000, Omega, law.invention
Abstract

Latest results on study of processes of $e^+e^-$ annihilation into exclusive hadronic states at $\sqrt{s}$ < 2 GeV obtained in the SND experiment at the VEPP-2M and VEPP-2000 colliders are presented. In particular, we announce results of the precise measurements of the $e^+e^-\to \pi^0 \gamma$ and $e^+e^-\to K^+ K^-$ cross sections, the first measurements of the $e^+e^-\to \omega \pi^0 \eta$ and $e^+e^-\to \pi^+ \pi^-\pi^0 \eta$ reactions and preliminary results of measurement of the $e^+e^-\to \pi^+ \pi^-$ cross section in energy range 0.5 < $\sqrt{s}$ < 0.9 GeV.

Published
2018

32. Measurement of the e+e−→ηπ+π− cross section with the SND detector at the VEPP-2000 collider

Author

S. V. Koshuba, E. V. Rogozina, K. A. Martin, A. S. Kupich, S. I. Serednyakov, Dmitry Shtol, Dmitry Berkaev, A. P. Lysenko, P. Yu. Shatunov, N. Yu. Muchnoi, T. V. Dimova, Ilya Zemlyansky, A. A. Botov, D. P. Kovrizhin, A. Yu. Barnyakov, Yu. A. Tikhonov, I. K. Surin, Konstantin Beloborodov, Alexander Bogdanchikov, Yu. V. Usov, A. V. Vasiljev, Z. K. Silagadze, V. B. Golubev, Yu. M. Shatunov, Ivan Koop, K. V. Pugachev, A. E. Obrazovsky, L. V. Kardapoltsev, M. N. Achasov, N. A. Melnikova, A. A. Korol, Alexey Kharlamov, A. V. Berdyugin, Evgeny Perevedentsev, V. P. Druzhinin, and E. V. Pakhtusova

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Electron–positron annihilation, Detector, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

The e+e-→ηπ+π- cross section is measured at the Spherical Neutral Detector (SND) detector in the η decay mode η→3π0. The analysis is based on the data sample with an integrated luminosity of 32.7 pb-1 collected at the VEPP-2000 e+e- collider in the center-of-mass energy range s=1.075–2.000 GeV. The data obtained in the η→3π0 decay mode are found to be in agreement with the previous SND measurements in the η→γγ mode. Therefore the measurements in the two modes are combined.

Published
2018

33. Measurement of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000 collider

Author

Aleksandr Korol, A. N. Kirpotin, D.A. Epifanov, D.N. Shemyakin, A.S. Popov, Fedor Ignatov, D. B. Shwartz, A.V. Vasiljev, N. Yu. Muchnoi, S. I. Serednyakov, A.E. Bondar, P. Krokovny, Z. K. Silagadze, K.Yu. Mikhailov, A.L. Sibidanov, V.S. Okhapkin, A.S. Kasaev, S.V. Koshuba, T. V. Dimova, L. V. Kardapoltsev, L.B. Epshteyn, N. A. Melnikova, A. A. Botov, Yu. M. Shatunov, I.B. Logashenko, A. I. Senchenko, V. B. Golubev, I. K. Surin, A.N. Amirkhanov, E. V. Pakhtusova, A.V. Bragin, A. V. Berdyugin, N.S. Bashtovoy, M. N. Achasov, A.Yu. Barnyakov, A.N. Kozyrev, A.S. Kuzmin, B.A. Shwartz, D. P. Kovrizhin, E. P. Solodov, A.A. Korobov, A.E. Ryzhenenkov, V.M. Aulchenko, R.R. Akhmetshin, A. P. Lysenko, S.V. Karpov, Yu. A. Tikhonov, P.A. Lukin, S.E. Gayazov, Vassili Kazanin, A.A. Grebenuk, A.A. Ruban, V. P. Druzhinin, Konstantin Beloborodov, Alexey Anisenkov, V. S. Banzarov, A.E. Kuzmenko, G.P. Razuvaev, Yu. A. Rogovsky, D. A. Shtol, A. E. Obrazovsky, Yu.V. Yudin, Alexey Kharlamov, Alexey Talyshev, I. A. Koop, I. M. Zemlyansky, Y. Usov, E.A. Kozyrev, D.E. Berkaev, P. Yu. Shatunov, A.N. Skrinsky, G.V. Fedotovich, E.A. Perevedentsev, S.S. Gribanov, A.L. Erofeev, Yu.N. Pestov, N.M. Ryskulov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, Alexander Bogdanchikov, K. A. Martin, A. S. Kupich, S.I. Eidelman, and D.N. Grigoriev

Subjects
Physics, Muon, Luminosity (scattering theory), 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Hadron, Detector, 01 natural sciences, law.invention, Nuclear physics, Upgrade, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Beam energy
Abstract

Since December 2010 the CMD-3 and SND detectors detectors collect data at the VEPP-2000 electron-positron collider. In 2013-2015 the injection facility of the collider has undergone an upgrade of the injection system. The new BINP injection complex has been connected to the VEPP-2000 collider, so the restrictions connected to the lack of positrons and limited beam energy transfer do not apply any more. The collider luminosity in whole energy range is restricted now only by beam-beam effects. VEPP-2000 collider started to collect data with two detectors at 2016 year. The collected data sample since 2010 corresponds more than 100 pb-1 of integrated luminosity per detector in the c.m. energy between 0.32 and 2GeV. We will report here results of analysis of various hadronic cross sections from detectors both published and preliminary. These measurements are important by themselves and also because of the implications for anomaly of the magnetic moment of a muon (g-2) discrepancy.

Published
2018

34. On the search for the η → e + e − decay at the VEPP-2000 e + e − collider

Author

D. A. Shtol, T. V. Dimova, Yu. M. Shatunov, L. V. Kardapoltsev, A. P. Lysenko, A. G. Bogdanchikov, Sergey Serednyakov, I. K. Surin, A. S. Kupich, Yu. A. Tikhonov, K. I. Beloborodov, A.Yu. Barnyakov, A. G. Kharlamov, D.B. Shwartz, M. N. Achasov, I. A. Koop, Y. Usov, S. V. Koshuba, A. V. Berdyugin, V. P. Druzhinin, A. N. Skrinsky, L. A. Korneev, N. Yu. Muchnoi, D. P. Kovrizhin, Yu. A. Rogovsky, E. V. Pakhtusova, Z. K. Silagadze, A. A. Korol, A. E. Obrazovsky, E. A. Perevedentsev, K. A. Martin, I. M. Zemlyansky, V. B. Golubev, A. V. Vasiljev, A. I. Senchenko, and A. A. Botov

Subjects
Physics, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), law, Analytical chemistry, Inverse, Collider, VEPP-2000, law.invention
Abstract

The sensitivity of the VEPP-2000 e + e − collider in the search for the rare decay η → e + e − has been studied. The inverse reaction e + e − → η is proposed for this search. We have analyzed a data sample with an integrated luminosity of 108 nb−1 collected with the SND detector in the center-of-mass energy range 520–580 MeV and found no background events for the reaction e + e − → η in the decay mode η → π0π0π0. In the absence of background, a sensitivity to B(η → e + e −) of 10−6 can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is higher than the current upper limit on B(η → e + e −) by a factor of 2.3.

Published
2015

35. New results of measurement of cross sections for electron-positron annihilation to hadrons with the SND detector at VEPP-2000

Author

A. P. Lysenko, I. A. Koop, A. A. Botov, A. V. Vasiljev, I. K. Surin, Sergey Serednyakov, A. N. Kirpotin, A. S. Kupich, A. I. Senchenko, A. G. Bogdanchikov, L. V. Kardapoltsev, A.Yu. Barnyakov, Yu. A. Tikhonov, S. V. Koshuba, T. V. Dimova, V. P. Druzhinin, K. I. Beloborodov, Yu. M. Shatunov, A. L. Romanov, A. V. Berdyugin, D. P. Kovrizhin, D. A. Shtol, D. E. Berkaev, A. A. Korol, A. S. Kasaev, Z. K. Silagadze, K. A. Martin, A. G. Kharlamov, V. M. Aul’chenko, E. V. Pakhtusova, M. N. Achasov, A. N. Skrinsky, V. B. Golubev, Yu. A. Rogovsky, E. A. Perevedentsev, and A. E. Obrazovsky

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Electron–positron annihilation, Hadron, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, Atomic nucleus, Neutron, Atomic physics, Collider, VEPP-2000, Bar (unit)
Abstract

A survey of preliminary results of experiments with the SND detector at the VEPP-2000 e+e− collider in the energy range of \(\sqrt s \) = 1000–2000 MeV MeV is presented. The cross sections for the processes e+e− → π0π0γ, e+e− → π+π−π0π0, e+e− → π+π−π0, e+e− → π+π−η, and e+e− → \(p\bar p\) were measured. The measured cross sections agree with the results of earlier measurements but have a higher precision. The cross section for the process e+e− → ηγ in the energy range extending from 1.4 to 2 GeV was measured for the first time. The ratio GE/GM for the neutron was measured for the first time in the timelike region.

Published
2015

36. Measurement of the e+e−→K+K− cross section in the energy range s=1.05−2.0 GeV

Author

A. P. Lysenko, P. Yu. Shatunov, I. K. Surin, L. V. Kardapoltsev, Yu. A. Rogovsky, M. N. Achasov, S. V. Koshuba, E. A. Kravchenko, A. V. Otboyev, A.N. Skrinsky, Yu. V. Usov, A. V. Berdyugin, V. B. Golubev, Yu. M. Shatunov, D. P. Kovrizhin, Evgeny Perevedentsev, T. V. Dimova, S. I. Serednyakov, A. E. Obrazovsky, Ivan Koop, Yu. A. Tikhonov, Dmitry Berkaev, Alexey Kharlamov, M.Yu. Barnyakov, Z. K. Silagadze, V. P. Druzhinin, S.A. Kononov, Ilya Zemlyansky, A. Yu. Barnyakov, V. M. Aulchenko, A. P. Onuchin, A. V. Vasiljev, A. R. Buzykaev, Konstantin Beloborodov, Dmitry Shtol, A. A. Botov, E. V. Pakhtusova, A. A. Korol, K. A. Martin, A. S. Kupich, and Alexander Bogdanchikov

Subjects
Physics, Range (particle radiation), Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, BaBar experiment, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, 010306 general physics, Collider, Energy (signal processing)
Abstract

The e+e-→K+K- cross section is measured in the center-of-mass energy range 1.05–2.00 GeV at the SND detector. The measurement is based on data with an integrated luminosity of 35 pb-1 collected at the VEPP-2000 e+e--collider. The obtained results are consistent with the previous most accurate data obtained in the BABAR experiment and have a comparable accuracy.

Published
2016

37. Updated measurement of the e+e−→ωπ0→π0π0γ cross section with the SND detector

Author

A. A. Botov, V. P. Druzhinin, L. V. Kardapoltsev, Dmitry Berkaev, M. N. Achasov, E. V. Pakhtusova, A. N. Kirpotin, V. B. Golubev, Yu. M. Shatunov, A.N. Skrinsky, A. V. Berdyugin, Yu. A. Rogovsky, Ivan Koop, I. K. Surin, A. A. Korol, S. I. Serednyakov, A. S. Kasaev, A. Yu. Barnyakov, T. V. Dimova, Dmitry Shtol, A. V. Vasiljev, A. I. Senchenko, D. B. Shwartz, A. E. Obrazovsky, S. V. Koshuba, Konstantin Beloborodov, Alexander Bogdanchikov, Alexey Kharlamov, Z. K. Silagadze, D. P. Kovrizhin, and K. A. Martin

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, Vector meson dominance, 01 natural sciences, Omega, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Vector meson, 010306 general physics, Collider, Energy (signal processing)
Abstract

We analyze a 37 pb$^{-1}$ data sample collected with the SND detector at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range 1.05--2.00 GeV and present an updated measurement of the $e^+e^- \to \omega \pi^0 \to \pi^0\pi^0\gamma$ cross section. In particular, we correct the mistake in radiative correction calculation made in our previous measurement based on a part of the data. The measured cross section is fitted with the vector meson dominance model with three $\rho$-like states and used to test the conserved vector current hypothesis in the $\tau^-\to\omega\pi^-\nu_{\tau}$ decay.

Published
2016

38. Overview of SND hadronic cross section measurements

Author

Konstantin Beloborodov, A.S. Kasaev, Alexey Kharlamov, S. I. Serednyakov, E. V. Pakhtusova, N. A. Melnikova, I. K. Surin, A.S. Kupich, A. A. Botov, V. P. Druzhinin, L.A. Korneev, D. P. Kovrizhin, L. V. Kardapoltsev, Yu. V. Usov, M. N. Achasov, K. V. Pugachev, A.V. Vasiljev, K. A. Martin, V. B. Golubev, D.E. Berkaev, Z. K. Silagadze, Yu. A. Rogovsky, A. N. Kirpotin, E.B. Ganeev, A. I. Senchenko, V. N. Zhabin, A. E. Obrazovsky, T. V. Dimova, N. Yu. Muchnoi, Alexander Bogdanchikov, A.Yu. Barnyakov, D. A. Shtol, D. B. Shwartz, S.V. Koshuba, Aleksandr Korol, V.M. Aulchenko, E. V. Rogozina, A. V. Berdyugin, R.A. Litvinov, and I. A. Koop

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, Detector, Hadron, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, 0103 physical sciences, Data analysis, 010306 general physics, Collider
Abstract

At the end of 2016 the SND detector resumed data taking at the upgraded VEPP-2000 e+e− collider. The analysis of data accumulated in 2010-2013 with an integrated lumonosity of 70 pb−1 is continuing. Recent results on measurements of various hadronic cross sections are presented.

Published
2019

39. Recent results from SND detector at VEPP-2000 collider

Author

K. V. Pugachev, D. P. Kovrizhin, Alexey Kharlamov, A. N. Kirpotin, A.N. Skrinsky, A.S. Kupich, D. A. Shtol, S. I. Serednyakov, Z. K. Silagadze, N. A. Melnikova, I. K. Surin, V. N. Zhabin, I. M. Zemlyansky, E. V. Pakhtusova, E.A. Perevedentsev, Dmitry Shatilov, M. N. Achasov, A. V. Berdyugin, A. A. Botov, P. Yu. Shatunov, A. E. Obrazovsky, A. P. Lysenko, R. A. Litvinov, T. V. Dimova, V. P. Druzhinin, Yu. V. Usov, V. B. Golubev, Yu. M. Shatunov, A.Yu. Barnyakov, N. Yu. Muchnoi, L. V. Kardopoltsev, Konstantin Beloborodov, Aleksandr Korol, D. B. Shwartz, S.V. Koshuba, K. A. Martin, and Alexander Bogdanchikov

Subjects
Physics, Nuclear physics, Annihilation, Luminosity (scattering theory), law, QC1-999, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Detector, Collider, VEPP-2000, law.invention
Abstract

Recent results on e+e−annihilation to hadrons from SND experiment at VEPP-2000 collider are presented. Corresponding data set is about 200 pb−1 of integrated luminosity collected at the energy region below 2 GeV. The processes e+e− → π+π− , π0γ, ωπ0, π+π−π0, ηπ+π−π0, η, π+π−4π0 have been studied. Searches for e+e− annihilation to C-even resonances η and f1(1285) were done.

Published
2019

40. Study of the processe+e−→ωηπ0in the energy ranges<2 GeVwith the SND detector

Author

A. P. Lysenko, N. A. Melnikova, A. E. Obrazovsky, Dmitry Shtol, Alexey Kharlamov, Ilya Zemlyansky, S. V. Koshuba, D. P. Kovrizhin, A. A. Botov, A. Yu. Barnyakov, S. I. Serednyakov, K. A. Martin, A. S. Kupich, Evgeny Perevedentsev, Yu. V. Usov, Yu. A. Tikhonov, A. V. Vasiljev, I. K. Surin, V. B. Golubev, Yu. M. Shatunov, A. A. Korol, Yu. A. Rogovsky, Dmitry Berkaev, P. Yu. Shatunov, Ivan Koop, A.N. Skrinsky, Z. K. Silagadze, Alexander Bogdanchikov, A. V. Berdyugin, E. V. Pakhtusova, V. M. Aulchenko, Konstantin Beloborodov, V. P. Druzhinin, L. V. Kardapoltsev, M. N. Achasov, and T. V. Dimova

Subjects
Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, 0103 physical sciences, Intermediate state, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, 01 natural sciences, Omega, Energy (signal processing), Luminosity
Abstract

The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\eta}{\ensuremath{\pi}}^{0}$ is studied in the energy range 1.45--2.00 GeV using data with an integrated luminosity of $33\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ accumulated by the SND detector at the ${e}^{+}{e}^{\ensuremath{-}}$ collider VEPP-2000. The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\eta}{\ensuremath{\pi}}^{0}$ cross section is measured for the first time. The cross section has a threshold near 1.75 GeV. Its value is about 2 nb in the energy range 1.8--2.0 GeV. The dominant intermediate state for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\eta}{\ensuremath{\pi}}^{0}$ is found to be $\ensuremath{\omega}{a}_{0}(980)$.

Published
2016

41. Recent results from SND detector

Author

Alexander Bogdanchikov, Alexey Kharlamov, Konstantin Beloborodov, K. A. Martin, A. S. Kupich, A. A. Botov, Yu. M. Shatunov, L. V. Kardapoltsev, A. A. Korol, M. N. Achasov, Ivan Koop, Z. K. Silagadze, Yu. V. Usov, T.V. Dimova, Dmitry Shtol, A. E. Obrazovsky, A. V. Berdyugin, Sergey Serednyakov, E. V. Pakhtusova, V. P. Druzhinin, I. K. Surin, D. P. Kovrizhin, V. B. Golubev, S. V. Koshuba, E. V. Rogozina, A. Yu. Barnyakov, and A. V. Vasiljev

Subjects
Nuclear physics, Physics, Range (particle radiation), Proton, Physics::Instrumentation and Detectors, law, Electron–positron annihilation, Detector, High Energy Physics::Experiment, Neutron, Nuclear Experiment, Collider, law.invention
Abstract

Recent results from the SND detector obtained in experiments at the VEPP-2000 e+e- collider are presented. The reactions e+e− → ηπ+π−, e+e− → K+K−, e+e− → π+π−π0, e+e− → ωπ0, e+e− → ωη have been studied in the energy region 1.05–2.00 GeV. The neutron and proton electromagnetic form factors have been measured in the energy range from the threshold up to 2 GeV. The result of the search of the rare process e+e− → η′ is also presented.

Published
2016

42. Measurement of hadron cross sections with the SND detector

Author

S. I. Serednyakov, S. V. Koshuba, A. E. Obrazovsky, V. B. Golubev, Z. K. Silagadze, Tatyana Dimova, K. I. Beloborodov, M. N. Achasov, A. V. Berdyugin, D. P. Kovrizhin, Yu. V. Usov, A.S. Kupich, Alexander Bogdanchikov, A. Yu. Barnyakov, Aleksandr Korol, I. K. Surin, A. V. Vasiljev, E. V. Pakhtusova, Dmitry Shtol, V. P. Druzhinin, A.G. Kharlamov, A. A. Botov, K. A. Martin, and L. V. Kardapoltsev

Subjects
Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Hadron, Detector, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics
Abstract

New results on exclusive hadron production in $e^+e^-$ annihilation obtained in experiments with the SND detector at the VEPP-2M and VEPP-2000 $e^+e^-$ colliders are presented., 4 pages, 4 figures, presented at the 14th International Workshop on Meson Production, Properties and Interaction (MESON 2016), Cracow, Poland, 2nd - 7th June 2016

Published
2016

43. First results of SND experiments at VEPP-2000

Author

Evgeny Perevedentsev, V. M. Aulchenko, Igor Nesterenko, V. B. Golubev, A.N. Skrinsky, Alexey Kharlamov, Yu. M. Shatunov, Yu. V. Usov, S. V. Koshuba, I. K. Surin, A. Yu. Barnyakov, L. V. Kardapoltsev, A. E. Obrazovsky, Ivan Koop, Alexander Bogdanchikov, Ilya Zemlyansky, A. P. Onuchin, M. N. Achasov, A. A. Botov, K.I. Grevtsov, T. V. Dimova, A. A. Korol, E. A. Kravchenko, A.V. Vasilyev, Dmitry Berkaev, A. N. Kirpotin, Konstantin Beloborodov, D.A. Bukin, K. Yu. Skovpen, K. A. Martin, V. P. Druzhinin, Dmitry Shtol, Sergey Serednyakov, Z. K. Silagadze, D. P. Kovrizhin, Yu. A. Tikhonov, E. V. Pakhtusova, and A. V. Berdugin

Subjects
Physics, Nuclear and High Energy Physics, Meson, Electron–positron annihilation, Hadron, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Pion, law, Collider, VEPP-2000, Lepton, Dimensionless quantity
Abstract

Preliminary results on e + e − → 3 π , 4 π , ω π 0 , η π + π − , p p ¯ , n n ¯ cross sections obtained with SND detector at VEPP-2000 collider are reported. The data were collected in 2010–2011 in the energy range 2 E = 1.0 – 2.0 GeV .

Published
2012

44. First results of spherical neutral detector (SND) experiments at VEPP-2000

Author

Yu. M. Shatunov, A. V. Otboev, K. Yu. Skovpen, Konstantin Beloborodov, D.E. Berkaev, K.I. Grevtsov, D.A. Bukin, V. P. Druzhinin, D. B. Shwartz, K. A. Martin, Sergey Serednyakov, A. E. Obrazovsky, A.V. Vasiljev, I. A. Koop, V. B. Golubev, L.V. Kardapoltsev, Alexander Bogdanchikov, Z. K. Silagadze, I.K. Surin, E. V. Pakhtusova, Yu. M. Zharinov, D. P. Kovrizhin, A.N. Skrinsky, A.G. Kharlamov, Yu. A. Tikhonov, P. Yu. Shatunov, S. V. Koshuba, A. V. Berdyugin, M. N. Achasov, T. V. Dimova, A. Yu. Barnyakov, Aleksandr Korol, Dmitry Shtol, A. A. Botov, E. A. Kravchenko, and A. L. Romanov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Annihilation, Luminosity (scattering theory), law, Detector, Center of mass, Atomic physics, Collider, VEPP-2000, law.invention
Abstract

Preliminary results of the first experiments at the new VEPP-2000 e + e − collider are presented. The experiments have been carried out in the center of mass energy range 1–2 GeV with instant luminosity 10 30 – 10 31 cm − 2 s − 1 and total integrated luminosity of about 10 pb − 1 . The main e + e − annihilation cross sections, π + π − π 0 π 0 , π + π − π 0 , π 0 π 0 γ , a n d π + π − η , have been measured. The cross section of nucleon–antinucleon production is also presented.

Published
2012

45. First results on the nucleon form factors from SND

Author

Igor Nesterenko, Aleksandr Korol, T.V. Dimova, A.A. Borisov, S.V. Koshuba, A.N. Skrinsky, Yu. A. Tikhonov, Yu. M. Shatunov, D. A. Shtol, A.L. Romanov, Z. K. Silagadze, A.V. Vasilyev, A. P. Lysenko, E.A. Perevedentsev, E. V. Pakhtusova, Sergey Serednyakov, K. A. Martin, I. K. Surin, Alexey Kharlamov, K. A. Grevtsov, L. V. Kardapoltsev, A.V. Berdugin, D. P. Kovrizhin, M. N. Achasov, P. Yu. Shatunov, Yu. V. Usov, V. P. Druzhinin, Konstantin Beloborodov, I. A. Koop, D.A. Bukin, K. Yu. Skovpen, D.E. Berkaev, Alexander Bogdanchikov, Ilya Zemlyansky, A. Yu. Barnyakov, V. B. Golubev, Yu. A. Rogovsky, A. E. Obrazovsky, and A. A. Botov

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Luminosity (scattering theory), Physics::Instrumentation and Detectors, Electron–positron annihilation, Hadron, Form factor (quantum field theory), Atomic and Molecular Physics, and Optics, Nuclear physics, High Energy Physics::Experiment, Nucleon, Lepton, Dimensionless quantity
Abstract

Results of the first measurements of the cross sections for the e + e − → p p ¯ and e + e − → n n ¯ with the SND detector are presented. The analysis is based on data with integrated luminosity of 2.8 pb − 1 , collected in 2011 by the SND detector at the VEPP-2000 e + e − collider in the energy range above nucleon production threshold.

Published
2012

46. Measurement of the cross section for the e + e − → ωπ0 → π0π0γ process in the energy range of 1.1–1.9 GeV

Author

A. V. Berdyugin, L. V. Kardapoltsev, A.Yu. Barnyakov, A. V. Vasiljev, V. P. Druzhinin, T. V. Dimova, D. A. Bukin, Yu. M. Shatunov, I. K. Surin, D. P. Kovrizhin, Yu. A. Rogovsky, M. N. Achasov, A. A. Botov, S. I. Serednyakov, S. V. Koshuba, D. E. Berkaev, A. N. Skrinsky, K. Yu. Skovpen, E. V. Pakhtusova, P. Yu. Shatunov, A. L. Romanov, Yu. A. Tikhonov, K. I. Beloborodov, A. A. Korol, A. E. Obrazovsky, A. G. Bogdanchikov, I. M. Zemlyansky, V. B. Golubev, A. G. Kharlamov, Z. K. Silagadze, K. A. Martin, D. B. Shvarts, D. A. Shtol, I. A. Koop, and Y. Usov

Subjects
Physics, Range (particle radiation), Particle physics, Physics and Astronomy (miscellaneous), Solid-state physics, Physics::Instrumentation and Detectors, Electron–positron annihilation, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, law.invention, Nuclear physics, Cross section (physics), law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Astrophysics::Galaxy Astrophysics, Energy (signal processing)
Abstract

The cross section for the e + e − → ωπ0 → π0π0γ process has been measured in the energy range of 1.1–1.9 GeV. The measurement has been made with the Spherical Neutral Detector at the VEPP-2000 e + e − collider. The data in the energy range of 1.1–1.4 GeV are in agreement with the earlier measurements with the SND and CMD-2 detectors. The cross section has also been measured above 1.4 GeV.

Published
2012

47. Collider experiment SND and Precision Physics with hadronic e+e- cross sections

Author

A. A. Botov, Dmitry Shtol, A. S. Kasaev, A. I. Senchenko, S. V. Koshuba, E. V. Rogozina, A. A. Korol, K. V. Pugachev, V. B. Golubev, Yu. V. Usov, N. Yu. Muchnoi, Alexey Kharlamov, T. V. Dimova, D. P. Kovrizhin, A. Yu. Barnyakov, E. V. Pakhtusova, Konstantin Beloborodov, L. A. Korneev, Ivan Koop, I. K. Surin, N. A. Melnikova, L. V. Kardapoltsev, M. N. Achasov, Alexander Bogdanchikov, Z. K. Silagadze, A. V. Vasiljev, V. M. Aulchenko, K. A. Martin, A. S. Kupich, V. N. Zhabin, Yu. A. Rogovsky, Dmitry Berkaev, V. P. Druzhinin, D. B. Shwartz, A. V. Berdyugin, A. E. Obrazovsky, S. I. Serednyakov, A. N. Kirpotin, and R. A. Litvinov

Subjects
Quantum chromodynamics, Physics, History, Particle physics, law, Electron–positron annihilation, Hadron, Collider, Computer Science Applications, Education, law.invention
Published
2018

48. New tracking system of the SND detector

Author

V. P. Druzhinin, A. A. Botov, V. B. Golubev, S. I. Serednyakov, P.V. Filatov, S. V. Koshuba, I. K. Surin, A. V. Vasiljev, A. E. Obrazovsky, D. A. Bukin, A. A. Sirotkin, E. V. Pakhtusova, A. G. Bogdanchikov, E. G. Avdeeva, Y. Usov, A. A. Korol, A. G. Kharlamov, V. M. Vesenev, and T. V. Dimova

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking system, Atomic and Molecular Physics, and Optics, Particle detector, law.invention, Nuclear physics, Optics, law, Measuring instrument, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, business, Collider
Abstract

A new tracking system (TS) of the Spherical Neutral Detector (SND) for experiments at the VEPP-2000 e+e− collider is described. The TS is completely assembled, mounted on the detector, and ready for collecting data from the VEPP-2000. Test experiments with cosmic-ray events and VEPP-2000 beams showed a stable operation of the system. The simulation, calibration, and reconstruction procedures were debugged by using available data.

Published
2010

49. Study of the process e + e − → π + π − π 0 π 0 at energies √ s < 1 GeV

Author

A. A. Botov, D. P. Kovrizhin, Yu. M. Shatunov, A. E. Obrazovsky, S. I. Serednyakov, S.V. Koshuba, Alexey Kharlamov, A. V. Vasil’ev, Yu. A. Tikhonov, Tatyana Dimova, Aleksandr Korol, L.V. Kardapoltsev, Z. K. Silagadze, E. V. Pakhtusova, M. N. Achasov, D. A. Shtol, A.N. Skrinsky, Konstantin Beloborodov, V. P. Druzhinin, V. B. Golubev, I. A. Koop, and A. V. Berdyugin

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Meson, law, Dominance model, Astronomy and Astrophysics, Collider, Instrumentation, Order of magnitude, law.invention
Abstract

In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e+e− → π+π−π0π0 was measured. At energies √s < 920 MeV this cross section was measured for the first time. The energy dependence of the cross section is well discribed by the vector dominance model with contributions from ρ, ρ', ρ'' mesons. The decay probability ρ → π +π−π0π0 was found to be Bρ = (1.60±0.74±0.18) × 10−5. The upper limit for the decay ω → π+π−π0π0 was improved by two orders of magnitude compared to the previous measurements and is Bω < 2 × 10−4 at 90% confidence level.

Published
2010

50. Study of process e + e − → π+π−π0π0 at energies √s < 1 GeV with the spherical neutral detector

Author

V. B. Golubev, T. V. Dimova, K. I. Beloborodov, Yu. M. Shatunov, A. V. Vasil’ev, E. V. Pakhtusova, A. A. Korol, A. V. Berdyugin, S. V. Koshuba, A. E. Obrazovsky, M. N. Achasov, Z. K. Silagadze, I. A. Koop, A. A. Botov, A. G. Kharlamov, D. A. Shtol, V. P. Druzhinin, Sergey Serednyakov, and D. P. Kovrizhin

Subjects
Physics, Cross section (physics), Solid-state physics, Detector, General Physics and Astronomy, Vector meson dominance, Atomic physics, Order of magnitude
Abstract

The cross section for the process e + e − → π+π−π0π0 has been measured in an experiment with a spherical neutral detector, with the cross section at energies √s < 920 MeV having been measured for the first time. The model of vector dominance describes well the data obtained if the ρ, ρ′, and ρ″ resonances are taken into account. The probability of the decay ρ → π+π−π0π0 is B(ρ → π+π−π0π0) = (1.60 ± 0.74 ± 0.18) × 10−5. The upper limit for the decay ω → π+π−π0π0 has been improved by two orders of magnitude compared to previous measurements and is B(ω → π+π−π0π0) < 2 × 10−4 at a 90% confidence level.

Published
2009

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