New Data from SND Detector in Novosibirs...

Measurement of the e+e- -> K+K- cross section in the energy range s**(1/2) = 1.04 - 1.38 GeV with the SND detector in the experiment at the VEPP-2M e+e- collider

July 16, 2007

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M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba, E. V. Pakhtusova, E. A. Perevedentsev, S. I. Serednyakov, Yu. M. Shatunov, Z. K. Silagadze, A. N. Skrinsky, ... , Vasiljev A. V.

High Energy Physics - Experi...

The cross section of the process $e^+e^- \to K^+K^-$ was measured in the energy range $\sqrt{s}$ = 1.04--1.38 GeV in the SND experiment at the VEPP-2M $e^+e^-$ collider. The measured cross section is described by the model of vector meson dominance with contributions from the light vector mesons $\rho$, $\omega$, $\phi$ and their lowest excitations. The mean statistical accuracy of the measurement is 4.4 %, and the systematic uncertainty is 5.2 %.

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Spherical Neutral Detector for VEPP-2M collider

September 10, 1999

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M. N. Achasov, V. M. Aulchenko, S. E. Baru, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, S. V. Burdin, T. V. Dimova, S. I. Dolinsky, A. A. Drozdetsky, V. P. Druzhinin, M. S. Dubrovin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, A. A. Korol, S. V. Koshuba, G. A. Kukartsev, E. V. Pakhtusova, V. M. Popov, A. A. Salnikov, S. I. Serednyakov, V. V. Shary, V. A. Sidorov, Z. K. Silagadze, Yu. V. Usov, A. V. Vasiljev, ... , Zakharov A. C.

Instrumentation and Detector...

The Spherical Neutral Detector (SND) operates at VEPP-2M collider in Novosibirsk studying e^+e^- annihilation in the energy range up to 1.4 GeV. Detector consists of a fine granulated spherical scintillation calorimeter with 1632 NaI(Tl) crystals, two cylindrical drift chambers with 10 layers of sense wires, and a muon system made of streamer tubes and plastic scintillation counters. The detector design, performance, data acquisition and processing are described.

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Reanalysis of the $e^+e^-\to\eta\gamma$ reaction cross section

September 7, 2007

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M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. A. Korol, S. V. Koshuba, E. V. Pakhtusova, S. I. Serednyakov, ... , Vasiljev A. V.

High Energy Physics - Experi...

In the experiment with the SND detector at the VEPP-2M $e^+e^-$ collider measuring the $e^+e^-\to \eta\gamma$ cross section in the energy range $0.6<\sqrt{s}<1.38 \mathrm{GeV}$ the reanalysis of data is performed. The goal is to improve the accuracy of the previous results by analysing ambiguities in the approximation of energy dependence of the $e^+e^-\to \eta\gamma$ cross section, which were not taken into account in our previous study. We report new results on the approxim...

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Measurement of the $e^+e^- \to \pi^+\pi^-\pi^0\eta$ cross section below $\sqrt{s}=2$ GeV

March 21, 2019

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M. N. Achasov, A. Yu. Barnyakov, 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, S. V. Koshuba, D. P. Kovrizhin, A. S. Kupich, R. A. Litvinov, A. P. Lysenko, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, S. I. Serednyakov, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol, Z. K. Silagadze, A. N. Skrinsky, I. K. Surin, Yu. A. Tikhonov, ... , Zemlyansky I. M.

High Energy Physics - Experi...

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 t...

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Study of the process $e^+e^- \to \pi^+\pi^-$ in the energy region 400<\sqrt[]{s}<1000 MeV

June 30, 2005

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M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba, A. P. Lysenko, A. V. Otboev, E. V. Pakhtusova, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, ... , Vasiljev A. V.

High Energy Physics - Experi...

The cross section of the process e^+e^-\to \pi^+\pi^- was measured in the SND experiment at the VEPP-2M collider in the energy region 400<\sqrt[]{s}<1000 MeV. This measurement was based on about 12.4 \times 10^6 selected collinear events, which include 7.4\times 10^6 e^+e^-\to e^+e^-, 4.5\times 10^6 e^+e^-\to\pi^+\pi^- and 0.5\times 10^6 e^+e^-\to\mu^+\mu^- selected events. The systematic uncertainty of the cross section determination is 1.3 %. The \rho-meson parameters were ...

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Evidence of the PHI(1020)--->ETA+PI0+GAMMA Decay

September 12, 1998

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M. N. Achasov, V. M. Aulchenko, S. E. Baru, A. V. Berdyugin, A. V. Bozhenok A. D. Bukin, D. A. Bukin, S. V. Burdin, T. V. Dimova, S. I. Dolinski, V. P. Druzhinin, M. S. Dubrovin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, P. M. Ivanov, A. A. Korol, S. V. Koshuba, A. P. Lysenko, E. V. Pakhtusova, A. A. Salnikov, S. I. Serednyakov, V. V. Shary, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, ... , Usov Yu. V.

High Energy Physics - Experi...

Signal of the rare radiative decay PHI--->ETA+PI0+GAMMA was observed in the SND experiment at VEPP-2M electron-positron collider.The result is based on the analysis of data, corresponding to a total integrated luminosity of 4 pb^{-1}, or 8x10^6 PHI mesons produced. The measured branching ratio of PHI--->ETA+PI0+GAMMA decay is equal to (0.83+-0.23)x10^{-4}.

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Experimental study of the e+e- -> pi0 gamma process in the energy region sqrt(s)=0.60-0.97 GeV

February 5, 2003

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M. N. Achasov, K. I. Beloborodov, A. V. Berdugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, V. N. Ivanchenko, A. A. Korol, S. V. Koshuba, E. V. Pakhtusova, A. A. Polunin, E. E. Pyata, A. A. Salnikov, S. I. Serednyakov, V. V. Shary, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, A. G. Skripkin, Yu. V. Usov, ... , Vasiljev A. V.

High Energy Physics - Experi...

Results of the study of the e+e-->pi0 gamma process with SND detector at VEPP-2M collider in the c.m.s. energy range sqrt(s)=0.60-0.97 GeV are presented. Using 36513 selected events corresponding to a total integrated luminosity of 3.4 pb^-1 the e+e-->pi0 gamma cross section was measured. The energy dependence of the cross section was analyzed in the framework of the vector meson dominance model. The data are well described by a sum of phi,omega,rho0->pi0 gamma decay contribu...

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New results on e+e- -> hadrons exclusive cross sections from experiments with SND detector at VEPP-2M e+e- collider in the energy range sqrt(s)=0.4-1.4 GeV

December 12, 2005

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S. I. Serednyakov, M. N. Achasov, K. I. Beloborodov, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. A. Korol, S. V. Koshuba, E. V. Pakhtusova, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, ... , Vasiljev A. V.

High Energy Physics - Experi...

New results of the e+e- -> pi+pi-, K+K-, K_SK_L, pi0/gamma, eta0/gamma processes cross section measurements are presented. The results are based on the 30 pb^-1 data, accumulated by SND detector at VEPP-2M e+e- collider in the energy range sqrt(s)=0.4-1.4 GeV during 1995-2000 years. The comparison with existing experimental data shows that the measurement accuracy is close to or better than the world average. For the e+e- -> pi+pi- process the accuracy is about 0.01. This is ...

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Study of dynamics of the process $e^+e^-\to \pi^+\pi^-\pi^0$ in the energy range 1.15--2.00 GeV

July 29, 2020

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Collaboration SND, 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. Muchnoi, 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, ... , Zhulanov V. V.

High Energy Physics - Experi...

The dynamics of the process $ e^+e^- \to \pi^+\pi^-\pi^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 $e^+e^-$ collider. The Dalitz plot distribution and $\pi^+\pi^-$ mass spectrum are analyzed in a model including the intermediate states $\rho(770)\pi$, $\rho(1450)\pi$, and $\omega\pi^0$. As a result, the energy dependences of the $\rho(770)\pi$ and $\rho(1450)\pi$ cross sections and the relative phases...

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Study of QED processes e+ e- --> e+ e- gamma, e+ e- gamma gamma with the SND detector at VEPP-2M

August 31, 1999

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M. N. Budker Institute of Nuclear Physics,Novosibirsk,Russia Achasov, S. E. Budker Institute of Nuclear Physics,Novosibirsk,Russia Baru, A. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Bozhenok, A. D. Budker Institute of Nuclear Physics,Novosibirsk,Russia Bukin, D. A. Budker Institute of Nuclear Physics,Novosibirsk,Russia Bukin, S. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Burdin, T. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Dimova, S. I. Budker Institute of Nuclear Physics,Novosibirsk,Russia Dolinsky, V. P. Budker Institute of Nuclear Physics,Novosibirsk,Russia Druzhinin, M. S. Budker Institute of Nuclear Physics,Novosibirsk,Russia Dubrovin, I. A. Budker Institute of Nuclear Physics,Novosibirsk,Russia Gaponenko, V. B. Budker Institute of Nuclear Physics,Novosibirsk,Russia Golubev, V. N. Budker Institute of Nuclear Physics,Novosibirsk,Russia Ivanchenko, A. A. Budker Institute of Nuclear Physics,Novosibirsk,Russia Korol, S. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Koshuba, A. P. Budker Institute of Nuclear Physics,Novosibirsk,Russia Lysenko, I. N. Budker Institute of Nuclear Physics,Novosibirsk,Russia Nesterenko, E. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Pakhtusova, S. I. Budker Institute of Nuclear Physics,Novosibirsk,Russia Serednyakov, V. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia Shary, Yu. M. Budker Institute of Nuclear Physics,Novosibirsk,Russia Shatunov, V. A. Budker Institute of Nuclear Physics,Novosibirsk,Russia Sidorov, ... , Usov Yu. V. Budker Institute of Nuclear Physics,Novosibirsk,Russia

High Energy Physics - Experi...

Results of the SND experiment at the VEPP-2M e+ e- collider on the QED processes e+ e- --> e+ e- gamma and e+ e- --> e+ e- gamma gamma with production at large angles are presented. Energy and angular distributions of the final particles were studied. No deviations from QED with an accuracy of 3.8% for the first process and 10.3% for the second were found.

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New Data from SND Detector in Novosibirsk

Measurement of the e+e- -> K+K- cross section in the energy range s**(1/2) = 1.04 - 1.38 GeV with the SND detector in the experiment at the VEPP-2M e+e- collider

Spherical Neutral Detector for VEPP-2M collider

Reanalysis of the $e^+e^-\to\eta\gamma$ reaction cross section

Measurement of the $e^+e^- \to \pi^+\pi^-\pi^0\eta$ cross section below $\sqrt{s}=2$ GeV

Study of the process $e^+e^- \to \pi^+\pi^-$ in the energy region 400<\sqrt[]{s}<1000 MeV

Evidence of the PHI(1020)--->ETA+PI0+GAMMA Decay

Experimental study of the e+e- -> pi0 gamma process in the energy region sqrt(s)=0.60-0.97 GeV

New results on e+e- -> hadrons exclusive cross sections from experiments with SND detector at VEPP-2M e+e- collider in the energy range sqrt(s)=0.4-1.4 GeV

Study of dynamics of the process $e^+e^-\to \pi^+\pi^-\pi^0$ in the energy range 1.15--2.00 GeV

Study of QED processes e+ e- --> e+ e- gamma, e+ e- gamma gamma with the SND detector at VEPP-2M