Related papers: Study of QED processes e+ e- --> e+ e- gamma, e+ e…

CMD-2 and SND results on the rho, omega and phi

The review of experimental results of the light vector mesons parameters studies with CMD-2 and SND detectors at VEPP-2M e+e- collider in the energy region 360 < sqrt{s} < 1380 MeV is given.

High Energy Physics - Experiment · Physics 2009-11-11 M. N. Achasov

Multi-photon production in e+e- collisions at sqrt(s)= 189 geV

The process e+e- to 2 (or 3) gammas is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb-1. The measured…

High Energy Physics - Experiment · Physics 2008-11-26 The OPAL collaboration , G. Abbiendi

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

The cross section for the process $e^+e^- \to \omega\eta$ is measured in the center-of-mass energy range 1.34--2.00 GeV. The analysis is based on data collected with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measured $e^+e^-…

High Energy Physics - Experiment · Physics 2016-11-15 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. S. Kasaev , A. G. Kharlamov , A. N. Kirpotin , D. P. Kovrizhin , I. A. Koop , A. A. Korol , S. V. Koshuba , A. S. Kupich , K. A. Martin , N. A. Melnikova , A. E. Obrazovsky , E. V. Pakhtusova , A. I. Senchenko , S. I. Serednyakov , Z. K. Silagadze , Yu. M. Shatunov , D. A. Shtol , D. B. Shwartz , A. N. Skrinsky , I. K. Surin , Yu. A. Tikhonov , A. V. Vasiljev

Study of $\Delta(1232)$ isobar electroproduction at VEPP-2M $e^+e^-$ collider

Results from the Spherical Nonmagnetic Detector (SND) on $\Delta (1232)$ isobar electroproduction in the collisions of beam electrons (positrons) and residual gas nuclei in the VEPP-2M $e^+e^-$ collider are presented. On the basis of the…

High Energy Physics - Experiment · Physics 2019-08-17 M. N. Achasov , A. V. Bozhenok , A. D. Bukin , D. A. Bukin , S. V. Burdin , T. V. Dimova , S. I. Dolinsky , V. P. Druzhinin , M. S. Dubrovin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , A. A. Korol , S. V. Koshuba , A. P. Lysenko , E. V. Pakhtusova , V. V. Shary , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , S. I. Serednyakov , A. A. Valishev , Yu. V. Usov

Total Cross Section of the Process e+e- -> pi+pi-pi+pi- in the C.M.Energy Range 980-1380 MeV

The e+e- -> pi+pi-pi+pi- cross section has been measured using 5.8/pb of integrated luminosity collected with the CMD-2 detector at the VEPP-2M collider. Analysis of the data with a refined efficiency determination and use of both three-…

High Energy Physics - Experiment · Physics 2008-11-26 R. R. Akhmetshin

Study of the process $e^+e^-\to K_S^0 K^{\pm}\pi^{\mp} \pi^+\pi^-$ in the C.M. energy range 1.6--2.0 GeV with the CMD-3 detector

The cross section of the process $e^+e^- \to K_S^0 K^{\pm}\pi^{\mp}\pi^+\pi^-$ has been measured for the first time using a data sample of 185.4 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. With the…

High Energy Physics - Experiment · Physics 2022-12-07 3 Collaboration

Study of the process $e^+e^- \to \omega\pi^0 \to \pi^+\pi^-\pi^0\pi^0$ in the energy range $1.05-2.00$ GeV with SND

The process $e^+e^- \to \omega\pi^0 \to \pi^+\pi^-\pi^0\pi^0$ is studied in the center-of-mass energy region $1.05-2.00$ GeV using data with an integral luminosity of about 35 pb$^{-1}$ collected with the SND detector at the VEPP-2000…

High Energy Physics - Experiment · Physics 2023-09-04 SND Collaboration , M. N. Achasov , A. Yu. Barnyakov , K. I. Beloborodov , A. V. Berdyugin , D. E. Berkaev , A. G. Bogdanchikov , A. A. Botov , V. S. Denisov , T. V. Dimova , V. P. Druzhinin , E. A. Eminov , L. B. Fomin , L. V. Kardapoltsev , A. G. Kharlamov , I. A. Koop , A. A. Korol , D. P. Kovrizhin , A. S. Kupich , A. P. Kryukov , N. A. Melnikova , N. Yu. Muchnoy , A. E. Obrazovsky , E. V. Pakhtusova , E. A. Perevedentsev , K. V. Pugachev , Yu. A. Rogovsky , S. I. Serednyakov , Yu. M. Shatunov , D. A. Shtol , Z. K. Silagadze , I. K. Surin , M. V. Timoshenko , Yu. V. Usov , I. M. Zemlyansky , V. N. Zhabin , V. V. Zhulanov

Study of the Processes e+ e- --> eta gamma, e+ e- --> pi0 gamma --> 3 gamma in the c.m. Energy Range 600--1380 MeV at CMD-2

The processes e+ e- --> eta gamma, e+ e- --> pi0 gamma --> 3 gamma have been studied in the c.m. energy range 600--1380 MeV with the CMD-2 detector. The following branching ratios have been determined: Br(rho --> eta gamma) = (3.21 +- 1.39…

High Energy Physics - Experiment · Physics 2012-08-27 CMD2 Collaboration

Tests of QED with Multi-Photonic Final States

In the Standard Model the process e+e- -> gamma-gamma is fully described by QED. Measurements of the differential cross-sections from the four LEP experiments are compared to the QED expectation and limits are set on parameters describing…

High Energy Physics - Experiment · Physics 2017-08-23 K. Sachs

First Physical Results from SND Detector at VEPP-2M

The paper describes experiments with the SND detector at VEPP-2M collider, carried out during the period from October 1995 until June 1997. The total integrated luminosity of 6.4 pb^{-1} was collected in the energy range 2E=0.4-1.4 GeV…

High Energy Physics - Experiment · Physics 2016-08-31 M. N. Achasov , M. G. Bek , K. I. Beloborodov , A. V. Berdyugin , A. V. Bozhenok , A. D. Bukin , D. A. Bukin , S. V. Burdin , V. V. Danilov , T. V. Dimova , S. I. Dolinsky , V. P. Druzhinin , M. S. Dubrovin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , P. I. Ivanov , I. A. Koop , A. A. Korol , M. S. Korostelev , S. V. Koshuba , A. P. Lysenko , A. A. Mamutkin , I. N. Nesterenko , E. V. Pakhtusova , E. A. Perevedentsev , A. A. Polunin , E. G. Pozdeev , V. I. Ptitsyn , E. E. Pyata , A. A. Salnikov , A. V. Savchkov , V. V. Shary , S. I. Serednyakov , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , A. N. Skrinsky , Yu. V. Usov , A. A. Valishev , A. V. Varganov , A. V. Vasiljev , Yu. S. Velikzhanin

Study of the $\rho$, $\omega$, $\phi\to\eta\gamma\to 7\gamma$ Decays with an SND Detector on a VEPP-2M Collider

The $e^+e^-\to\eta\gamma\to 7\gamma$ process was studied in the energy range $2E=600\div 1060$ MeV with an SND detector on a VEPP-2M $e^+e^-$ collider. The decay branching ratios $B(\phi\to\eta\gamma)=(1.343\pm 0.012\pm 0.055)\cdot…

High Energy Physics - Experiment · Physics 2008-11-26 M. N. Achasov , S. E. Baru , K. I. Beloborodov , A. V. Berdyugin , A. V. Bozhenok , A. G. Bogdanchikov , D. A. Bukin , S. V. Burdin , A. V. Vasiljev , Yu. S. Velikzhanin , T. V. Dimova , V. P. Druzhinin , M. S. Dubrovin , D. I. Ganyushin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , I. A. Koop , A. A. Korol , S. V. Koshuba , G. A. Kukartsev , E. V. Pakhtusova , A. A. Salnikov , S. I. Serednyakov , V. V. Shary , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze

Experimental study of the decay PHI(1020)--->ETA+GAMMA in multi-photon final state

In the SND experiment at VEPP-2M e^+e^- collider the phi(1020) ---> eta+gamma ---> 3pi^0+gamma decay was studied. The branching ratio B(phi--->eta+gamma) = (1.246 +- 0.025 +- 0.057)% was measured.

High Energy Physics - Experiment · Physics 2008-11-26 M. N. Achasov , S. E. Baru , A. V. Berdyugin , A. V. Bozhenok , A. D. Bukin , D. A. Bukin , S. V. Burdin , T. V. Dimova , S. I. Dolinsky , V. P. Druzhinin , M. S. Dubrovin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , A. A. Korol , S. V. Koshuba , I. N. Nesterenko , 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 , Yu. S. Velikzhanin

Multi-photon final states in e^+e^- collisions at sqrt{s} = 130-172 GeV

The process e^+e^- -> gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 25.38 pb^{-1} taken at centre-of-mass energies of 130-172 GeV. The…

High Energy Physics - Experiment · Physics 2008-11-26 The OPAL Collaboration , K. Ackerstaff et al

Measurement of the $e^+e^-\to\eta\gamma$ cross section near the $\phi(1020)$ resonance with the SND detector

In the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider, the $e^+e^-\to\eta\gamma$ cross section is measured in the energy range $E = 980 - 1060$ MeV. The measurement is carried out in the $\eta\to 2\gamma$ decay mode.…

High Energy Physics - Experiment · Physics 2025-10-21 SND Collaboration , M. N. Achasov , A. E. Alizzi , A. Yu. Barnyakov , E. V. Bedarev , K. I. Beloborodov , A. V. Berdyugin , A. G. Bogdanchikov , A. A. Botov , D. E. Chistyakov , T. V. Dimova , V. P. Druzhinin , L. V. Kardapoltsev , A. S. Kasaev , A. A. Kattsin , A. G. Kharlamov , I. A. Koop , A. A. Korol , D. P. Kovrizhin , A. S. Kupich , A. P. Kryukov , N. A. Melnikova , N. Yu. Muchnoi , A. E. Obrazovsky , A. A. Oorzhak , E. V. Pakhtusova , I. A. Polomoshnov , K. V. Pugachev , S. A. Rastigeev , Yu. A. Rogovsky , A. I. Senchenko , S. I. Serednyakov , Yu. M. Shatunov , D. A. Shtol , Z. K. Silagadze , K. D. Sungurov , I. K. Surin , Yu. V. Usov , V. N. Zhabin , Yu. M. Zharinov , V. V. Zhulanov

Search for the process $\mathbf{\it e^+e^-\to\eta^{\prime}\gamma}$ in the energy range $\mathbf{\it \sqrt{s}}$ = 1.075 -- 2 GeV

The results of the search for the $e^+e^-\to\eta^{\prime}\gamma$ process in the center-of-mass energy range from 1.075 to 2 GeV are presented. We analyze data with an integral luminosity of 746 pb$^{-1}$ accumulated with the SND detector at…

High Energy Physics - Experiment · Physics 2024-06-26 M. N. Achasov , A. Yu. Barnyakov , E. V. Bedarev , K. I. Beloborodov , A. V. Berdyugin , A. G. Bogdanchikov , A. A. Botov , T. V. Dimova , V. P. Druzhinin , V. N. Zhabin , Yu. M. Zharinov , L. V. Kardapoltsev , A. S. Kasaev , A. A. Kattsin , A. N. Kyrpotin , D. P. Kovrizhin , I. A. Koop , A. A. Korol , A. S. Kupich , A. P. Kryukov , N. A. Melnikova , N. Yu. Muchnoy , A. E. Obrazovsky , E. V. Pakhtusova , K. V. Pugachev , S. A. Rastigeev , Yu. A. Rogovsky , A. I. Senchenko , S. I. Serednyakov , Z. K. Silagadze , I. K. Surin , Yu. V. Usov , A. G. Kharlamov , D. E. Chistyakov , Yu. M. Shatunov , S. P. Sherstyuk , D. A. Shtol

New experimental data for the decays $\phi\to\mu^+\mu^-$ and $\phi\to\pi^+\pi^-$ from SND detector

The processes $e^+e^-\to\mu^+\mu^-$ and $e^+e^-\to\pi^+\pi^-$ have been studied with SND detector at VEPP-2M $e^+e^-$ collider in the vicinity of $\phi(1020)$ resonance. The branching ratios $B(\phi\to\mu^+\mu^-)=(3.30\pm 0.45\pm…

High Energy Physics - Experiment · Physics 2008-11-26 M. N. Achasov , V. M. Aulchenko , K. I. Beloborodov , A. V. Berdyugin , A. V. Bozhenok , 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 , P. M. Ivanov , A. A. Korol , S. V. Koshuba , G. A. Kukartsev , I. N. Nesterenko , A. V. Otboev , E. V. Pakhtusova , V. M. Popov , A. A. Salnikov , S. I. Serednyakov , V. V. Shary , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , Yu. V. Usov , A. V. Vasiljev , A. S. Zakharov

Measurement of the $\mathbf{e^+e^-\to K^+K^-}$ cross section in the energy range $\mathbf{\sqrt{s}=1.05-2.0}$ GeV

The $e^+e^-\to K^+K^-$ 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…

High Energy Physics - Experiment · Physics 2016-12-14 M. N. Achasov , V. M. Aulchenko , A. Yu. Barnyakov , M. Yu. Barnyakov , 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 , S. A. Kononov , I. A. Koop , A. A. Korol , S. V. Koshuba , D. P. Kovrizhin , E. A. Kravchenko , A. S. Kupich , A. P. Lysenko , K. A. Martin , A. E. Obrazovsky , A. P. Onuchin , A. V. Otboyev , E. V. Pakhtusova , E. A. Perevedentsev , Yu. A. Rogovsky , S. I. Serednyakov , Yu. M. Shatunov , P. Yu. Shatunov , D. A. Shtol , Z. K. Silagadze , A. N. Skrinsky , I. K. Surin , Yu. A. Tikhonov , Yu. V. Usov , A. V. Vasiljev , I. M. Zemlyansky

Investigation of the $e^+e^- \to \omega \pi^0 \to \pi^0 \pi^0 \gamma$ reaction in the energy domain near the $\phi$-meson

The $e^+e^- \to \omega \pi^0 \to \pi^0 \pi^0 \gamma$ process was investigated in the SND experiment at the VEPP-2M collider. A narrow energy interval near the $\phi$-meson was scanned. The observed cross-section reveals, at the level of…

High Energy Physics - Experiment · Physics 2009-09-25 M. N. Achasov , V. M. Aulchenko , A. V. Berdyugin , A. V. Bozhenok , D. A. Bukin , S. V. Burdin , T. V. Dimova , V. P. Druzhinin , M. S. Dubrovin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , I. A. Koop , A. A. Korol , S. V. Koshuba , E. V. Pakhtusova , A. A. Salnikov , V. V. Shary , S. I. Serednyakov , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , A. A. Valishev

Large angle QED processes at e^+e^- colliders at energies below 3 GeV

QED processes at electron-positron colliders are considerd. We present differential cross-sections for large-angle Bhabha scattering, annihilation into muons and photons. Radiative corrections in the first order are taken into account…

High Energy Physics - Phenomenology · Physics 2009-10-30 A. B. Arbuzov , G. V. Fedotovich , E. A. Kuraev , N. P. Merenkov , V. D. Rushai , L. Trentadue

a_1(1260) dominance in the process e+e- \to 4\pi at energies 1.05--1.38 GeV

First results of the study of the process e+e- \to 4\pi by the CMD-2 collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV. Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the processes e+e- \to…

High Energy Physics - Experiment · Physics 2012-08-27 CMD2 Collaboration