Search

Your search keyword '"F.V. Ignatov"' showing total 62 results
Start Over Author "F.V. Ignatov"
62 results on '"F.V. Ignatov"'

1. Study of the process e+e−→KS0K±π∓π+π− in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

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

Subjects
Physics, QC1-999
Abstract

A cross section of the process e+e−→KS0K±π∓π+π− 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 KS0→π+π− decay detection, 373±20 and 514±28 signal events have been selected with six and five reconstructed tracks, respectively, in the center-of-mass energy range 1.6–2.0 GeV. The total systematic uncertainty of the cross section is about 15%. A study of the production dynamics allows us to extract a contribution from the e+e−→f1(1285)π+π− intermediate state and to measure the corresponding cross section. The intermediate states with the f1(1420) and f1(1510) resonances have been observed.

Published
2023
Full Text
View/download PDF

2. Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, I.A. Koop, A.N. Kirpotin, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.I. Senchenko, Yu.M. Shatunov, P.Yu. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, A.A. Talyshev, V.M. Titov, S.S. Tolmachev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e+e− collider. The very fast rise with about 1 MeV width has been observed in the e+e−→pp¯ cross section. A sharp drop in the e+e−→3(π+π−) cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the e+e−→pp¯ cross section. For the first time a similar sharp drop is demonstrated in the e+e−→K+K−π+π− cross section. The behavior of the e+e−→3(π+π−),K+K−π+π− cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the e+e−→2(π+π−) cross section.

Published
2019
Full Text
View/download PDF

3. Study of the process e+e− → 3(π+π−)π0 in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, I.A. Koop, A.N. Kirpotin, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.I. Senchenko, Yu.M. Shatunov, P.Yu. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The cross section of the process e+e−→3(π+π−)π0 has been measured for the first time using a data sample of 56.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. 632±32 signal events have been selected in the center-of-mass energy range 1.6–2.0 GeV. A study of dynamics of seven-pion production allows one to extract contributions of the dominated 2(π+π−)ω and 2(π+π−)η intermediate states.

Published
2019
Full Text
View/download PDF

4. Study of the process e+e−→KS0KS0π+π− in the c.m. energy range 1.6–2.0 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, F.J. Grancagnolo, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, I.A. Koop, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, A.P. Lysenko, K.Yu. Mikhailov, V.S. Okhapkin, E.A. Perevedentsev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.V. Semenov, Yu.M. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, M.V. Timoshenko, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The cross section of the process e+e−→KS0KS0π+π− has been measured using a data sample of 56.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. 596±27 and 210±18 signal events have been selected with six and five detected tracks, respectively, in the center-of-mass energy range 1.6–2.0 GeV. The total systematic uncertainty of the cross section is about 10%. The study of the production dynamics confirms the dominance of the K⁎(892)+K⁎(892)− intermediate state.

Published
2020
Full Text
View/download PDF

5. Study of the process e+e− → K+K−η with the CMD-3 detector at the VEPP-2000 collider

Author

V.L. Ivanov, G.V. Fedotovich, R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, I.A. Koop, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, A.P. Lysenko, K.Yu. Mikhailov, V.S. Okhapkin, E.A. Perevedentsev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.V. Semenov, Yu.M. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, M.V. Timoshenko, V.M. Titov, A.A. Talyshev, S.S. Tolmachev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K−η has been studied in the center-of-mass energy range from 1.59 to 2.007 GeV using the data sample of 59.5 pb−1, collected with the CMD-3 detector at the VEPP-2000 e+e− collider in 2011, 2012 and 2017. The K+K−η final state is found to be dominated by the contribution of the ϕ(1020)η intermediate state. The cross section of the process e+e−→ϕ(1020)η has been measured with a systematic uncertainty of 5.1% on the base of 3009 ± 67 selected events. The obtained cross section has been used to calculate the contribution to the anomalous magnetic moment of the muon: aμϕη(E

Published
2019
Full Text
View/download PDF

6. Study of the process e+e−→K+K− in the center-of-mass energy range 1010–1060 MeV with the CMD-3 detector

Author

E.A. Kozyrev, E.P. Solodov, R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.S. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, A.A. Korobov, I.A. Koop, A.N. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, A.P. Lysenko, K.Yu. Mikhailov, V.S. Okhapkin, E.A. Perevedentsev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K− has been studied using 1.7×106 events from a data sample corresponding to an integrated luminosity of 5.7 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 1010–1060 MeV. The cross section is measured with about 2% systematic uncertainty and is used to calculate the contribution to the anomalous magnetic moment of the muon aμK+K−=(19.33±0.40)×10−10, and to obtain the ϕ(1020) meson parameters. We consider the relationship between the e+e−→K+K− and e+e−→KS0KL0 cross sections and compare it to the theoretical prediction.

Published
2018
Full Text
View/download PDF

7. Study of the process e+e−→π+π−π0η in the c.m. energy range 1394–2005 MeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, I.A. Koop, A.N. Kirpotin, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.I. Senchenko, Yu.M. Shatunov, P.Yu. Shatunov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, I.M. Zemlyansky, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The cross section of the process e+e−→π+π−π0η has been measured using a data sample of 21.8 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. 2769±95 signal events have been selected in the center-of-mass energy range 1394–2005 MeV. The production dynamics is dominated by the ω(782)η and ϕ(1020)η intermediate states in the lower energy range, and by the a0(980)ρ(770) intermediate state at higher energies.

Published
2017
Full Text
View/download PDF

8. Study of the process e+e−→π+π−π+π− in the c.m. energy range 920–1060 MeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, I.A. Koop, O.A. Kovalenko, A.A. Korobov, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, A.P. Lysenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

A cross section of the process e+e−→π+π−π+π− has been measured using 6798±93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 920–1060 MeV. The measured cross section exhibits a pattern of interference of the ϕ(1020)→π+π−π+π− decay with a non-resonant process e+e−→π+π−π+π−, from which we obtain the branching fraction of the doubly suppressed decays (by G-parity and OZI rule): B(ϕ→π+π−π+π−)=(6.5±2.7±1.6)×10−6.

Published
2017
Full Text
View/download PDF

9. Study of the process e+e−→KS0KL0 in the center-of-mass energy range 1004–1060 MeV with the CMD-3 detector at the VEPP-2000 e+e− collider

Author

E.A. Kozyrev, E.P. Solodov, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.S. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, A.N. Kirpotin, A.A. Korobov, O.A. Kovalenko, A.N. Kozyrev, I.A. Koop, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, A.S. Popov, G.P. Razuvaev, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A.I. Senchenko, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, P.Yu. Shatunov, Yu.M. Shatunov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

The e+e−→KS0KL0 cross section has been measured in the center-of-mass energy range 1004–1060 MeV at 25 energy points using 6.1×105 events with KS0→π+π− decay. The analysis is based on 5.9 pb−1 of an integrated luminosity collected with the CMD-3 detector at the VEPP-2000 e+e− collider. To obtain ϕ(1020) meson parameters the measured cross section is approximated according to the Vector Meson Dominance model as a sum of the ρ,ω,ϕ-like amplitudes and their excitations. This is the most precise measurement of the e+e−→KS0KL0 cross section with a 1.8% systematic uncertainty.

Published
2016
Full Text
View/download PDF

10. Study of the process e+e−→pp¯ in the c.m. energy range from threshold to 2 GeV with the CMD-3 detector

Author

R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, E.M. Gromov, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, A.S. Kasaev, V.F. Kazanin, B.I. Khazin, A.N. Kirpotin, I.A. Koop, O.A. Kovalenko, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, A.V. Otboev, Yu.N. Pestov, S.G. Pivovarov, A.S. Popov, G.P. Razuvaev, A.L. Romanov, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, P.Yu. Shatunov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, Yu.V. Yudin, and Yu.M. Zharinov

Subjects
Physics, QC1-999
Abstract

Using a data sample of 7.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider we select about 2900 events of the process e+e−→pp¯ and measure its cross section at 12 energy points with about 6% systematic uncertainty. From the angular distribution of produced nucleons we obtain the ratio GE/GM.

Published
2016
Full Text
View/download PDF

11. Measurement of the e+e−→K+K−π+π− cross section with the CMD-3 detector at the VEPP-2000 collider

Author

D.N. Shemyakin, G.V. Fedotovich, R.R. Akhmetshin, A.N. Amirkhanov, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, S.E. Gayazov, A.A. Grebenuk, S.S. Gribanov, D.N. Grigoriev, F.V. Ignatov, V.L. Ivanov, S.V. Karpov, V.F. Kazanin, I.A. Koop, A.A. Korobov, O.A. Kovalenko, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, A.P. Lysenko, P.A. Lukin, K.Yu. Mikhailov, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, Yu.V. Yudin, and I.M. Zemlyansky

Subjects
Physics, QC1-999
Abstract

The process e+e−→K+K−π+π− has been studied in the center-of-mass energy range from 1500 to 2000 MeV using a data sample of 23 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. Using about 24 000 selected events, the e+e−→K+K−π+π− cross section has been measured with a systematic uncertainty decreasing from 11.7% at 1500–1600 MeV to 6.1% above 1800 MeV. A preliminary study of K+K−π+π− production dynamics has been performed.

Published
2016
Full Text
View/download PDF

12. Search for the process e+e−→η′(958) with the CMD-3 detector

Author

R.R. Akhmetshin, A.V. Anisenkov, V.M. Aulchenko, V.Sh. Banzarov, N.S. Bashtovoy, D.E. Berkaev, A.E. Bondar, A.V. Bragin, S.I. Eidelman, D.A. Epifanov, L.B. Epshteyn, A.L. Erofeev, G.V. Fedotovich, S.E. Gayazov, A.A. Grebenuk, D.N. Grigoriev, E.N. Gromov, F.V. Ignatov, S.V. Karpov, V.F. Kazanin, B.I. Khazin, I.A. Koop, O.A. Kovalenko, A.N. Kozyrev, E.A. Kozyrev, P.P. Krokovny, A.E. Kuzmenko, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, K.Yu. Mikhailov, N.Yu. Muchnoi, V.S. Okhapkin, Yu.N. Pestov, E.A. Perevedentsev, A.S. Popov, G.P. Razuvaev, Yu.A. Rogovsky, A.L. Romanov, A.A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, V.E. Shebalin, D.N. Shemyakin, B.A. Shwartz, D.B. Shwartz, A.L. Sibidanov, P.Yu. Shatunov, Yu.M. Shatunov, E.P. Solodov, V.M. Titov, A.A. Talyshev, A.I. Vorobiov, and Yu.V. Yudin

Subjects
Physics, QC1-999
Abstract

A search for the process e+e−→η′(958) in the π+π−η→π+π−γγ final state has been performed with the CMD-3 detector at the VEPP-2000 e+e− collider. Using an integrated luminosity of 2.69 pb−1 collected at the center-of-mass energy Ec.m.=957.68 MeV we set an upper limit for the product of electronic width and branching fractions Γη′(958)→e+e−⋅Bη′(958)→π+π−η⋅Bη→γγ

Published
2015
Full Text
View/download PDF

13. Recent results from the CMD-3 detector

Author

Yu. M. Shatunov, Alexey Talyshev, V.E. Shebalin, V. L. Ivanov, F.V. Ignatov, A. N. Kirpotin, E.A. Kozyrev, A.E. Bondar, A.N. Kozyrev, Sergei V. Karpov, V.Sh. Banzarov, N.M. Ryskulov, P. Yu. Shatunov, A.S. Kuzmin, Yu. A. Rogovsky, D.E. Berkaev, P. Krokovny, A. V. Semenov, S.I. Eidelman, A. V. Otboev, A.S. Popov, Alexey Anisenkov, P.A. Lukin, G.V. Fedotovich, K.Yu. Mikhailov, I. A. Koop, A. I. Senchenko, S.E. Gayazov, D.N. Shemyakin, V.M. Aulchenko, A.A. Ruban, Yu.V. Yudin, D.N. Grigoriev, D. B. Shwartz, I.B. Logashenko, A.L. Sibidanov, L.B. Epshtein, G.P. Razuvaev, N.S. Bashtovoy, A. I. Vorobiov, V.M. Titov, B.A. Shwartz, A.E. Ryzhenenkov, R.R. Akhmetshin, A.N. Amirkhanov, Yu.N. Pestov, A.V. Bragin, A.E. Kuzmenko, A.A. Grebenuk, D.A. Epifanov, Ilya Zemlyansky, S.S. Gribanov, A.L. Erofeev, E. P. Solodov, A.A. Korobov, Vassili Kazanin, and V.S. Okhapkin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Hadron, Detector, 01 natural sciences, law.invention, law, 0103 physical sciences, 010306 general physics, Collider, Energy (signal processing)
Abstract

This paper reports a current status of the measurements of the hadronic cross sections in the c.m. energy range from 0.32 to 2.0 GeV with the CMD-3 detector at the VEPP-2000 electron-positron collider. The overall size of the data, acquired by the CMD-3 in the runs of 2010–2013 and 2017–2018 years, is about 160 pb−1. The results of data analysis for various exclusive modes of e + e − → h a d r o n s are described.

Published
2020

14. Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Author

Yu. M. Shatunov, N.M. Ryskulov, V.S. Okhapkin, D. B. Shwartz, A. N. Kirpotin, A. I. Senchenko, D.N. Shemyakin, A.L. Sibidanov, D.N. Grigoriev, P. Yu. Shatunov, F.V. Ignatov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, Yu.N. Pestov, Yu.V. Yudin, P.A. Lukin, A.V. Bragin, E. P. Solodov, N.S. Bashtovoy, A.A. Korobov, B.A. Shwartz, A.S. Popov, G.P. Razuvaev, G.V. Fedotovich, D.E. Berkaev, A.E. Ryzhenenkov, Alexey Talyshev, Vassili Kazanin, R.R. Akhmetshin, S.V. Karpov, E.A. Kozyrev, S.E. Gayazov, A.S. Kuzmin, V.Sh. Banzarov, D.A. Epifanov, K.Yu. Mikhailov, I. A. Koop, A.N. Amirkhanov, A.E. Bondar, A.A. Ruban, V.M. Titov, I.B. Logashenko, V.M. Aulchenko, A.E. Kuzmenko, L.B. Epshteyn, A.N. Kozyrev, S.I. Eidelman, A. V. Otboev, A.A. Grebenuk, S. S. Tolmachev, Ilya Zemlyansky, S.S. Gribanov, A.L. Erofeev, Alexey Anisenkov, and P. Krokovny

Subjects
Physics, Nuclear and High Energy Physics, Resonance amplitude, Annihilation, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Atomic physics, Nucleon, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999, High Energy Physics - Experiment
Abstract

A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. A very fast rise with about 1 MeV width has been observed in the $e^+e^- \to p\bar p$ cross section. A sharp drop in the $e^+e^- \to 3(\pi^+\pi^-)$ cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the $e^+e^- \to p\bar p$ cross section. For the first time a similar sharp drop is demonstrated in the $e^+e^- \to K^+K^-\pi^+\pi^-$ cross section. The behavior of the $e^+e^- \to 3(\pi^+\pi^-),~ K^+K^-\pi^+\pi^-$ cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the $e^+e^- \to 2(\pi^+\pi^-)$ cross section., Comment: 7 pages, 5 figures

Published
2019

15. Production of four charged pions with the CMD-3 detector at the VEPP-2000 collider

Author

A. P. Lysenko, A.S. Kuzmin, A.A. Grebenuk, A. V. Semenov, A.S. Popov, V.M. Titov, Alexey Anisenkov, E. P. Solodov, P.A. Lukin, A.A. Korobov, K.Yu. Mikhailov, N.S. Bashtovoy, Yu. M. Shatunov, G.V. Fedotovich, D.E. Berkaev, Vassili Kazanin, A.S. Kasaev, A.N. Amirkhanov, V.S. Okhapkin, A.V. Bragin, P. Krokovny, S.E. Gayazov, B.A. Shwartz, A.A. Ruban, A.E. Kuzmenko, A.E. Ryzhenenkov, R.R. Akhmetshin, A.E. Bondar, Yu.V. Yudin, S.I. Eidelman, A. V. Otboev, V.E. Shebalin, L.B. Epshteyn, A.I. Vorobiov, V. L. Ivanov, I. A. Koop, D.N. Grigoriev, I.B. Logashenko, N.M. Ryskulov, G.P. Razuvaev, Alexey Talyshev, E.A. Kozyrev, F.V. Ignatov, V.Sh. Banzarov, D. B. Shwartz, A.L. Sibidanov, V.M. Aulchenko, A.N. Kozyrev, S.V. Karpov, Yu.N. Pestov, E.A. Perevedentsev, A. I. Senchenko, D.N. Shemyakin, S.S. Gribanov, A.L. Erofeev, and D.A. Epifanov

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

16. Hadronic cross sections with the CMD-3 detector at the VEPP-2000

Author

A. N. Kirpotin, A. I. Senchenko, I.B. Logashenko, D.N. Shemyakin, L.B. Epshteyn, S.E. Gayazov, A.A. Ruban, A.E. Kuzmenko, I. A. Koop, D. B. Shwartz, A.L. Sibidanov, G.P. Razuvaev, S.S. Gribanov, P.A. Lukin, A.L. Erofeev, P. Krokovny, Yu.V. Yudin, Yu.N. Pestov, Alexey Talyshev, A.N. Amirkhanov, V.Sh. Banzarov, D. Epifanov, F.V. Ignatov, N.M. Ryskulov, D.E. Berkaev, Yu. A. Rogovsky, E.A. Kozyrev, Ilya Zemlyansky, Alexey Anisenkov, B.A. Shwartz, A.E. Ryzhenenkov, V.M. Titov, R.R. Akhmetshin, N.S. Bashtovoy, V.S. Okhapkin, A.A. Grebenuk, A.V. Bragin, A.S. Kuzmin, A.E. Bondar, S.V. Karpov, P. Yu. Shatunov, E. P. Solodov, A.A. Korobov, V.M. Aulchenko, A.N. Kozyrev, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, G.V. Fedotovich, Vassili Kazanin, Yu. M. Shatunov, Semen Eidelman, A.S. Popov, K.Yu. Mikhailov, A. V. Otboev, and D.N. Grigoriev

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

This paper reports measurements of the hadronic cross sections with the CMD-3 detector at the VEPP-2000 electron-positron collider. The overall size of the data sample analyzed is about 60 pb-1, collected by the CMD- 3 running since December 2010 up to June 2013 in the c.m. energy range from 0.32 to 2.0 GeV. The preliminary results of data analysis for various modes of e + e − → hadrons are discussed.

Published
2018

17. Charged particle identification with the liquid xenon calorimeter of the CMD-3 detector

Author

S. Eidelman, E. P. Solodov, A. A. Grebenuk, A.N. Kozyrev, Yu.N. Pestov, L.B. Epshteyn, D.N. Grigoriev, A.A. Korobov, A.E. Kuzmenko, Yu.V. Yudin, Alexey Anisenkov, V. L. Ivanov, N.M. Ryskulov, A.L. Erofeev, P.A. Lukin, Vassili Kazanin, A.N. Amirkhanov, D.N. Shemyakin, D.A. Epifanov, G.P. Razuvaev, V. M. Aulchenko, S.S. Tolmachev, Alexei Talyshev, P. Krokovny, S.E. Gayazov, S.S. Gribanov, A.S. Popov, A.V. Semenov, A. A. Uskov, E.A. Kozyrev, V.S. Okhapkin, A.S. Kuzmin, K.Yu. Mikhailov, F.V. Ignatov, Sergei V. Karpov, A.E. Bondar, A.V. Bragin, I.B. Logashenko, A. I. Vorobiov, A.E. Ryzhenenkov, B. Shwartz, V.E. Shebalin, A.A. Ruban, G.V. Fedotovich, V.M. Titov, N.S. Bashtovoy, and R.R. Akhmetshin

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, chemistry.chemical_element, Particle identification, Charged particle, law.invention, Nuclear physics, Xenon, Pion, chemistry, law, High Energy Physics::Experiment, Collider, Instrumentation
Abstract

The paper describes a method of the charged particle identification, developed for the CMD-3 detector, installed at the VEPP-2000 e + e − collider. The method is based on application of boosted decision trees classifiers, trained for the optimal separation of electrons, muons , pions and kaons in the momentum range from 100 to 1200 MeV / c . The input variables for the classifiers are linear combinations of the energy depositions of charged particles in 12 layers of the liquid xenon calorimeter of the CMD-3. The event samples for training of the classifiers are taken from the simulation. Various issues of the calorimeter strip channels response simulation and their calibration are considered. Application of the method is illustrated by the examples of separation of the e + e − ( γ ) and π + π − ( γ ) final states and of selection of the K + K − final state at high energies.

Published
2021

18. Study of the process e + e − → π + π − π 0 η in the c.m. energy range 1394–2005 MeV with the CMD-3 detector

Author

L.B. Epshteyn, A.E. Bondar, S. Eidelman, A.N. Kozyrev, Yu. A. Rogovsky, I.B. Logashenko, A.A. Ruban, G.P. Razuvaev, A. V. Otboev, Alexey Anisenkov, A.S. Kuzmin, A.S. Popov, Alexei Talyshev, A.L. Erofeev, D.N. Grigoriev, V. L. Ivanov, A. N. Kirpotin, R.R. Akhmetshin, B. Shwartz, E.A. Kozyrev, D.A. Epifanov, K.Yu. Mikhailov, F.V. Ignatov, Yu. M. Shatunov, A.E. Ryzhenenkov, V.S. Okhapkin, P. Krokovny, Ivan Koop, D. E. Berkaev, A.A. Korobov, V. M. Aulchenko, A.V. Bragin, Vassili Kazanin, N.S. Bashtovoy, D. B. Shwartz, V.M. Titov, V.E. Shebalin, P. Yu. Shatunov, A. I. Vorobiov, G.V. Fedotovich, P.A. Lukin, Yu.V. Yudin, A. I. Senchenko, S.E. Gayazov, S.S. Gribanov, D.N. Shemyakin, V.Sh. Banzarov, A.N. Amirkhanov, A.L. Sibidanov, N.M. Ryskulov, Sergei V. Karpov, E. P. Solodov, A. A. Grebenuk, Yu.N. Pestov, A.E. Kuzmenko, and Ilya Zemlyansky

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, Analytical chemistry, 01 natural sciences, lcsh:QC1-999, Lower energy, High Energy Physics - Experiment, law.invention, law, 0103 physical sciences, Pi, Intermediate state, High Energy Physics::Experiment, 010306 general physics, Collider, lcsh:Physics, Energy (signal processing)
Abstract

The cross section of the process $e^+e^- \to \pi^+\pi^-\pi^0\eta$ has been measured using a data sample of 21.8 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 2769$\pm$95 signal events have been selected in the center-of-mass energy range 1394--2005 MeV. The production dynamics is dominated by the $\omega(782)\eta$ and $\phi(1020)\eta$ intermediate states in the lower energy range, and by the $a_0(980)\rho(770)$ intermediate state at higher energies., Comment: 20 pages, 11 figures, 2 tables

Published
2017

19. 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

20. Study of π+π−π+π− production with CMD-3 detector at the VEPP-2000 collider

Author

N.M. Ryskulov, D. B. Shwartz, A.L. Sibidanov, V.E. Shebalin, D.E. Berkaev, A.I. Vorobiov, V. L. Ivanov, E.A. Perevedentsev, S.S. Gribanov, A.L. Erofeev, A.S. Kuzmin, A.V. Bragin, Alexey Anisenkov, A.S. Kasaev, A.N. Amirkhanov, Yu.N. Pestov, A. I. Senchenko, A. V. Semenov, Yu. M. Shatunov, D.N. Shemyakin, I.B. Logashenko, L.B. Epshteyn, V.M. Titov, G.P. Razuvaev, V.M. Aulchenko, V.Sh. Banzarov, A.N. Kozyrev, Yu.V. Yudin, A.E. Bondar, V.S. Okhapkin, A.A. Grebenuk, Alexey Talyshev, E. P. Solodov, E.A. Kozyrev, A. P. Lysenko, B.A. Shwartz, A.A. Korobov, A.S. Popov, N.S. Bashtovoy, I. A. Koop, A.E. Ryzhenenkov, R.R. Akhmetshin, K.Yu. Mikhailov, Vassili Kazanin, S.I. Eidelman, A. V. Otboev, P. Krokovny, S.E. Gayazov, A.A. Ruban, D.A. Epifanov, A.E. Kuzmenko, P.A. Lukin, D.N. Grigoriev, G.V. Fedotovich, S.V. Karpov, and F.V. Ignatov

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), Muon, Anomalous magnetic dipole moment, QC1-999, Hadron, Electron, 01 natural sciences, 010305 fluids & plasmas, law.invention, Nuclear physics, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000
Abstract

The cross section of the process e+e−→ π+π−π+π− has been measured using an integrated luminosity of 17 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 650-1000 MeV. High-precision measurements of various hadronic cross sections are of great interest in relation with the problem of the muon anomalous magnetic moment g-2. This measurement can be also used to test the relation between the cross section of e+e−→ π+ π−π+ π− and the spectral function for the τ−→ π−π0π0π0 decay predicted by the conservation of vector current (CVC).

Published
2019

21. 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

22. The NNbar and multihadron production at the threshold at VEPP2000

Author

A.S. Popov, A. V. Semenov, K.Yu. Mikhailov, E. P. Solodov, A.A. Korobov, Vassili Kazanin, D.E. Berkaev, Yu. M. Shatunov, P. Krokovny, I.B. Logashenko, V.S. Okhapkin, N.M. Ryskulov, S.V. Karpov, N.S. Bashtovoy, A.S. Kuzmin, S.S. Gribanov, Alexey Talyshev, A.N. Amirkhanov, A.L. Erofeev, E.A. Kozyrev, Yu.V. Yudin, B.A. Shwartz, F.V. Ignatov, L.B. Epshteyn, P.A. Lukin, A.E. Ryzhenenkov, R.R. Akhmetshin, Yu. A. Rogovsky, D.A. Epifanov, Ilya Zemlyansky, G.P. Razuvaev, A.A. Grebenuk, Yu.N. Pestov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, A.V. Bragin, D. B. Shwartz, A.L. Sibidanov, V.M. Aulchenko, A.N. Kozyrev, A. N. Kirpotin, D.N. Shemyakin, D.N. Grigoriev, Alexey Anisenkov, P. Yu. Shatunov, S.I. Eidelman, A.E. Bondar, G.V. Fedotovich, I. A. Koop, V.M. Titov, V.Sh. Banzarov, S.E. Gayazov, A.A. Ruban, and A.E. Kuzmenko

Subjects
Physics, Resonance amplitude, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, QC1-999, Hadron, Atomic physics
Abstract

A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e+e− collider. A very fast rise with an about 1 MeV width has been observed in the e+e−→ pp̅ cross section. A sharp drop in the e+ e−→ 3(π+π−) cross section has been con?rmed and found to have a width of less than 2 MeV, in agreement with the observed fast rise of the e+e−→ pp̅ cross section. For the ?rst time a similar sharp drop is demonstrated in the e+e−→ K+ K−π+π− cross section. The behavior of the e+e−→ 3(π+ π−), K+ K−π+π− cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the e+e−→ 2(π+π−) cross section.

Published
2019

23. Study of the process e+e−→ K+K−π0 in the center-of-mass energy range 1.2–2 GeV with the CMD-3 detector

Author

A. V. Semenov, P.A. Lukin, F.V. Ignatov, E.A. Perevedentsev, N.S. Bashtovoy, L.B. Epshteyn, S.S. Gribanov, D.A. Epifanov, V.Sh. Banzarov, A.L. Erofeev, G.P. Razuvaev, S.E. Gayazov, A.A. Ruban, G.V. Fedotovich, S.V. Karpov, Yu.N. Pestov, A.E. Kuzmenko, B.A. Shwartz, Yu.V. Yudin, A.S. Kuzmin, A.E. Ryzhenenkov, R.R. Akhmetshin, Alexey Talyshev, A.S. Popov, N.M. Ryskulov, V.M. Titov, E.A. Kozyrev, I.B. Logashenko, D.E. Berkaev, K.Yu. Mikhailov, A. P. Lysenko, P. Krokovny, I. A. Koop, A.A. Grebenuk, Yu. M. Shatunov, V.S. Okhapkin, A.S. Kasaev, E. P. Solodov, A.A. Korobov, A.N. Amirkhanov, A.V. Bragin, A. I. Senchenko, Vassili Kazanin, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, D.N. Shemyakin, V.M. Aulchenko, A.N. Kozyrev, Alexey Anisenkov, D. B. Shwartz, A.L. Sibidanov, A.E. Bondar, D.N. Grigoriev, S.I. Eidelman, and A. V. Otboev

Subjects
Physics, Nuclear physics, Range (particle radiation), law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, QC1-999, Detector, Center of mass, Collider, Energy (signal processing), law.invention
Abstract

The process e+ e−→ K+ K−π0 has been studied in the center-of-mass energy range from 1.2 to 2 GeV using a 80.6 pb−1 data sample collected with the CMD-3 detector at the electron-positron collider VEPP-2000. Preliminary results of the cross-section measurement are presented.

Published
2019

24. Study of the process e + e − → K S K ± π ∓ with CMD-3 detector

Author

N.M. Ryskulov, A. V. Otboev, I.B. Logashenko, L.B. Epshteyn, A.N. Amirkhanov, P. Krokovny, A.L. Erofeev, A.L. Sibidanov, A.E. Ryzhenenkov, Ilya Zemlyansky, P.A. Lukin, A.V. Bragin, A.S. Popov, S. S. Tolmachev, V. S. Banzarov, Yu.V. Yudin, A. A. Uskov, V. L. Ivanov, P. Yu. Shatunov, N.S. Bashtovoy, K.Yu. Mikhailov, S.E. Gayazov, E.A. Kozyrev, A. I. Senchenko, A.S. Kuzmin, S.S. Gribanov, F.V. Ignatov, Yu. M. Shatunov, Sergei V. Karpov, Yu.N. Pestov, G.V. Fedotovich, Alexey Anisenkov, D.N. Shemyakin, V.E. Shebalin, A.E. Kuzmenko, D.N. Grigoriev, E. P. Solodov, A.A. Ruban, A. A. Grebenuk, A.E. Bondar, D.A. Epifanov, Ivan Koop, A. N. Kirpotin, V.M. Titov, G.P. Razuvaev, S. Eidelman, A.N. Kozyrev, Yu. A. Rogovsky, R. E. Gerasimov, V. M. Aulchenko, D. B. Shwartz, A. I. Vorobiov, B. Shwartz, V.S. Okhapkin, D. E. Berkaev, A.A. Korobov, R.R. Akhmetshin, Vassili Kazanin, and Alexei Talyshev

Subjects
Nuclear physics, Physics, Detector, Process (computing), Condensed Matter Physics, Mathematical Physics, Atomic and Molecular Physics, and Optics
Published
2020

25. Overview of the CMD-3 recent results

Author

D.A. Epifanov, D. E. Berkaev, A.A. Korobov, M.V. Timoshenko, Sergei V. Karpov, I.B. Logashenko, P.A. Lukin, E.A. Kozyrev, Vassili Kazanin, S. Eidelman, D.N. Shemyakin, D. B. Shwartz, G.P. Razuvaev, A.N. Kozyrev, A.S. Kasaev, Yu. M. Shatunov, A.A. Ruban, V.Sh. Banzarov, N.S. Bashtovoy, A.E. Bondar, A.N. Amirkhanov, A.L. Sibidanov, V. L. Ivanov, E. P. Solodov, S.E. Gayazov, V.S. Okhapkin, Ivan Koop, A. A. Grebenuk, S.S. Gribanov, A.E. Ryzhenenkov, A.L. Erofeev, A.S. Kuzmin, D.N. Grigoriev, A.S. Popov, A. V. Semenov, Alexei Talyshev, L.B. Epshteyn, A. I. Vorobiov, K.Yu. Mikhailov, R.R. Akhmetshin, Yu.V. Yudin, V. M. Aulchenko, Yu.N. Pestov, B. Shwartz, F.V. Ignatov, Evgeny Perevedentsev, A.E. Kuzmenko, G.V. Fedotovich, A.V. Bragin, S. S. Tolmachev, Alexey Anisenkov, N.M. Ryskulov, F. Grancagnolo, V.E. Shebalin, A. P. Lysenko, and P. Krokovny

Subjects
Physics, History, Computer Science Applications, Education
Abstract

The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 in December 2010 with a goal to collect about 1 fb−1. The collected data sample corresponds to an integrated luminosity of 200 pb−1 in the center-of-mass energy range from 0.32 up to 2 GeV. This paper reports recent results on the hadronic cross sections measurements with the CMD-3 detector.

Published
2020

26. PID system based on focusing aerogel RICH for the super C-τ factory

Author

I.A. Kuyanov, V.V. Porosev, M.Yu. Barnyakov, V.A. Tayursky, E. A. Kravchenko, A.Yu. Barnyakov, I.V. Ovtin, Alexey Talyshev, L. Shekhtman, A.F. Danilyuk, A.A. Katcin, P.V. Kasyanenko, A. P. Onuchin, V.A. Rodiakin, N.A. Podgornov, A.V. Bykov, F.V. Ignatov, S.A. Kononov, V.S. Boborovnikov, Alexey Buzykaev, and D.V. Korda

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, PID controller, 01 natural sciences, Particle identification, 030218 nuclear medicine & medical imaging, Nuclear physics, Momentum, 03 medical and health sciences, 0302 clinical medicine, Silicon photomultiplier, 0103 physical sciences, Factory (object-oriented programming), High Energy Physics::Experiment, Instrumentation, Realization (systems), Beam (structure)
Abstract

A high performance particle identification (PID) system is essential for the successful realization of the broad physics program at the future Super C- τ Factory in Novosibirsk. The main requirements for the PID system are as follows: good π / K -separation in the entire operational momentum range and good μ ∕ π -separation in the momentum range from 0.3 to 1.2 GeV/ c . The RICH detector based on focusing aerogel radiator (FARICH) and position-sensitive photon detector meets all these requirements. The FARICH method is described, and the beam test results are presented. The FARICH system design outline for the Super C- τ Factory project is presented. Most promising photon detector options are considered.

Published
2020

27. Study of the e+e- -> hadrons reactions with CMD-3 detector at VEPP-2000 collider

Author

Ilya Zemlyansky, Alexey Anisenkov, E.Shebalin, A.S. Kuzmin, N.M. Ryskulov, S.E. Gayazov, S.S. Gribanov, I.B. Logashenko, D.A. Epifanov, A.V. Bragin, K Y.Mikhailov, D.N. Grigoriev, A.S. Popov, F.Kazanin, A.L. Sibidanov, P. Yu. Shatunov, A.N. Amirkhanov, D. E. Berkaev, A.A. Korobov, L.Ivanov, Yu.V. Yudin, Evgeniy Solodov, P.A. Lukin, G.V. Fedotovich, A. V. Otboev, A.A. Ruban, P. Krokovny, S. Eidelman, A.N. Kozyrev, A. N. Kirpotin, A.E. Ryzhenenkov, A.E. Bondar, S.Okhapkin, Yu. M. Shatunov, A. I. Senchenko, R.R. Akhmetshin, A. A. Grebenuk, D.N. Shemyakin, Yu.N. Pestov, G.P. Razuvaev, M.Aulchenko, L.B. Epshteyn, A.E. Kuzmenko, Ivan Koop, Alexei Talyshev, N.S. Bashtovoy, E.A. Kozyrev, Sergei V. Karpov, S.Banzarov, F.V. Ignatov, A.L. Erofeev, B. Shwartz, D. B. Shwartz, and A. I. Vorobiov

Subjects
Physics, Muon, Luminosity (scattering theory), Anomalous magnetic dipole moment, Electron–positron annihilation, Hadron, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, VEPP-2000
Abstract

The CMD-3 detector is taking data at the VEPP-2000 $e^+e^-$ collider (Budker INP, Novosibirsk, Russia). The main goal of experiments with CMD-3 is the measurement of the cross-sections and dynamics of the exclusive modes of $e^+e^- \to hadrons$ reactions. In particular, these results provide important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. First round of data taking with the CMD-3 detector was performed in 2011-2013 with about 60 1/pb integrated luminosity in the energy range from 0.32 to 2.0 GeV in center-of-mass. Amount of collected data exceeds all previous experiments. Here we present the survey of results of data taken in 2011-2013, including precise measurement of $e^+e^-\to \pi^+\pi^-$ reaction, as well as other hadron final states with up to 6 pions or states include 2 kaons. At the end of 2016 the VEPP-2000 collider resumed operations after upgrade of the injection system, and performance approaching to the project luminosity of $10^{32}\ cm^{-2}s^{-1}$ at 2 GeV has been demonstrated. First preliminary results of new 2017 run are also presented.

Published
2017

28. Search for the processe+e−→η′(958)with the CMD-3 detector

Author

N.M. Ryskulov, N. Yu. Muchnoi, A.L. Erofeev, V.S. Okhapkin, B.A. Shwartz, D.N. Grigoriev, D.E. Berkaev, A.E. Ryzhenenkov, S.E. Gayazov, L.B. Epshteyn, R.R. Akhmetshin, E. P. Solodov, V.M. Titov, P. Yu. Shatunov, P. Krokovny, A.A. Ruban, A.V. Bragin, I.B. Logashenko, A.S. Kuzmin, G.V. Fedotovich, A.E. Kuzmenko, V.E. Shebalin, A.I. Vorobiov, S.I. Eidelman, O.A. Kovalenko, A.L. Sibidanov, Yu.V. Yudin, Yu.N. Pestov, I. A. Koop, B.I. Khazin, N.S. Bashtovoy, Yu. A. Rogovsky, E.A. Perevedentsev, F.V. Ignatov, G.P. Razuvaev, Alexey Anisenkov, Alexey Talyshev, E.A. Kozyrev, V.M. Aulchenko, A.N. Kozyrev, D. A. Epifanov, A.L. Romanov, A.E. Bondar, S.V. Karpov, E.N. Gromov, Yu. M. Shatunov, A.S. Popov, P.A. Lukin, K.Yu. Mikhailov, Vassili Kazanin, D.B. Shwartz, D.N. Shemyakin, V.Sh. Banzarov, and A.A. Grebenuk

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Electron–positron annihilation, Detector, Physical chemistry
Abstract

A search for the process e + e − → η ′ ( 958 ) in the π + π − η → π + π − γ γ final state has been performed with the CMD-3 detector at the VEPP-2000 e + e − collider. Using an integrated luminosity of 2.69 pb − 1 collected at the center-of-mass energy E c.m. = 957.68 MeV we set an upper limit for the product of electronic width and branching fractions Γ η ′ ( 958 ) → e + e − ⋅ B η ′ ( 958 ) → π + π − η ⋅ B η → γ γ 0.00041 eV at 90% C.L.

Published
2015

29. Calorimetry of the CMD-3 detector

Author

K.Yu. Mikhailov, Alexey Talyshev, D.N. Grigoriev, D. A. Epifanov, A.S. Kuzmin, N.S. Bashtovoy, V.E. Shebalin, A.A. Ruban, A.N. Kozyrev, G.P. Razuvaev, A.L. Erofeev, R.R. Akhmetshin, Alexey Anisenkov, O.A. Kovalenko, V.M. Titov, I.B. Logashenko, L.B. Epshteyn, B.A. Shwartz, V.M. Aulchenko, Yu.V. Yudin, F.V. Ignatov, A.E. Kuzmenko, A.A. Grebenuk, Vassili Kazanin, and V.S. Okhapkin

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Calorimetry, 01 natural sciences, Calorimeter, law.invention, Nuclear physics, Xenon, chemistry, law, 0103 physical sciences, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider, Instrumentation, Beam (structure)
Abstract

CMD-3 is a general purpose detector designed to study e + e − annihilation into hadrons. It is mounted at VEPP-2000 collider which operates in the wide energy range, E c . m . s = 0.32 − 2 GeV . The calorimetry at the detector is based on three subsystems: closest to the beam pipe barrel Liquid Xenon calorimeter, outer barrel calorimeter based on CsI scintillation crystals and the endcap calorimeter made of BGO scintillation crystals. We describe the structure of the calorimeters, their electronics and the energy calibration procedures.

Published
2016

30. Recent results from CMD-3

Author

N.M. Ryskulov, S.I. Eidelman, I.B. Logashenko, D.N. Grigoriev, A.N. Amirkhanov, P. Krokovny, P.A. Lukin, S.V. Karpov, B.A. Shwartz, A.E. Ryzhenenkov, Ilya Zemlyansky, A.V. Bragin, R.R. Akhmetshin, A.S. Popov, Alexey Talyshev, P. Yu. Shatunov, A. N. Kirpotin, N.S. Bashtovoy, K.Yu. Mikhailov, E.A. Kozyrev, A.S. Kuzmin, D.E. Berkaev, A.A. Grebenuk, S.S. Gribanov, Yu. M. Shatunov, A.L. Erofeev, F.V. Ignatov, Yu.N. Pestov, G.V. Fedotovich, Alexey Anisenkov, D.N. Shemyakin, S.E. Gayazov, Yu.V. Yudin, V.E. Shebalin, A.I. Vorobiov, A.A. Ruban, A.E. Bondar, A. V. Semenov, V. L. Ivanov, D.A. Epifanov, A.E. Kuzmenko, I. A. Koop, V.M. Titov, G.P. Razuvaev, V.Sh. Banzarov, Yu. A. Rogovsky, V.M. Aulchenko, A.N. Kozyrev, D. B. Shwartz, A.L. Sibidanov, V.S. Okhapkin, E. P. Solodov, L.B. Epshteyn, A.A. Korobov, and Vassili Kazanin

Subjects
Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Electron–positron annihilation, Detector, 01 natural sciences, law.invention, law, 0103 physical sciences, Range (statistics), 010306 general physics, Collider
Abstract

Regular data taking with the CMD-3 at the electron-positron collider VEPP-2000 is under way since 2010. The collected data sample corresponds to about 200 inverse picobarns of integrated luminosity per detector in the energy range from 0.32 up to 2 GeV, with a goal to collect about 1 fb−1 during next five years. Some of the recent results from the CMD-3 detector are discussed.

Published
2019

31. Simulation of physics background in Super c-tau factory detector

Author

V.A. Tayursky, F.V. Ignatov, and L. Shekhtman

Subjects
Physics, Luminosity (scattering theory), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Detector, Radius, 01 natural sciences, Charged particle, Magnetic field, Nuclear physics, 0103 physical sciences, Radiative transfer, Neutron, 010306 general physics
Abstract

Simulation of background particle fluxes generated by colliding beams is performed with FLUKA package for the Super C-Tau factory Detector (SCTD). Two processes are considered as main sources of luminosity generated background: two-photon production of electron-positron pairs and Bha-Bha scattering with bremsstrahlung photon emission (radiative Bha-Bha). The SCTD geometry is described corresponding to the last version of the Conceptual Design Report. The magnetic field based on the calculation in ANSYS is introduced in the model. Main results of the simulation for beam energy of 3 GeV, luminosity of 1035 cm−2s−1 and 1.5 T magnetic field are the following: charged particle fluence in the region of the Inner Tracker (radius 5cm -20 cm, Z between -30cm and 30 cm) is between 105 particles/(cm2s) and ∼103 particles/(cm2s); 1-MeV neutron equivalent fluence for Si in the regions corresponding to electronics of the Inner Tracker and the Drift Chamber is below 1011 n/(cm2y) and absorbed dose is below 100 Gy/y in the hottest regions of the detector.

Published
2019

32. Study of the e+e−→ KS KLπ0 process up to 2 GeV with the CMD-3 detector at the VEPP-2000 collider

Author

P. Yu. Shatunov, A.E. Bondar, G.V. Fedotovich, N.M. Ryskulov, P.A. Lukin, D. B. Shwartz, A.L. Sibidanov, E. P. Solodov, A.A. Korobov, I. A. Koop, S.V. Karpov, N.S. Bashtovoy, A.S. Popov, A.N. Amirkhanov, D.E. Berkaev, I.B. Logashenko, Alexey Anisenkov, A.S. Kuzmin, Vassili Kazanin, K.Yu. Mikhailov, Ilya Zemlyansky, B.A. Shwartz, A.E. Ryzhenenkov, Yu. M. Shatunov, R.R. Akhmetshin, A. V. Semenov, Alexey Talyshev, V.E. Shebalin, A.I. Vorobiov, F.V. Ignatov, V. L. Ivanov, S.E. Gayazov, A.A. Ruban, A.V. Bragin, V.M. Titov, V.S. Okhapkin, S.I. Eidelman, A.E. Kuzmenko, V.M. Aulchenko, E.A. Kozyrev, S.S. Gribanov, A.N. Kozyrev, A.L. Erofeev, L.B. Epshteyn, P. Krokovny, G.P. Razuvaev, Yu.N. Pestov, A.A. Grebenuk, D.N. Grigoriev, D.A. Epifanov, Yu. A. Rogovsky, Yu.V. Yudin, V.Sh. Banzarov, A. N. Kirpotin, and D.N. Shemyakin

Subjects
Physics, Physics::Instrumentation and Detectors, QC1-999, Electron–positron annihilation, Detector, law.invention, Nuclear physics, Cross section (physics), law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, VEPP-2000
Abstract

The cross section of the process e+ e−→ KS KL π0 has been studied with the CMD-3 detector at the VEPP-2000 electron-positron collider in the center-of-mass energy range from 1.1 to 2 GeV. Preliminary results on the total cross section of the process are presented.

Published
2019

33. Search for the process e+e−→D*(2007) with the CMD-3 detector

Author

P.A. Lukin, B.A. Shwartz, Alexey Talyshev, A.E. Ryzhenenkov, V.E. Shebalin, A.I. Vorobiov, R.R. Akhmetshin, V. L. Ivanov, D.N. Grigoriev, E.A. Kozyrev, P. Krokovny, Alexey Anisenkov, A.S. Kuzmin, V.M. Titov, I. A. Koop, A.S. Popov, A. P. Lysenko, L.B. Epshteyn, S.E. Gayazov, A.A. Grebenuk, D.A. Epifanov, A. V. Semenov, S. S. Tolmachev, A.A. Ruban, A.E. Kuzmenko, E.A. Perevedentsev, A.E. Bondar, D.E. Berkaev, S.I. Eidelman, A. V. Otboev, V.M. Aulchenko, G.V. Fedotovich, A.N. Kozyrev, S.V. Karpov, K.Yu. Mikhailov, A. I. Senchenko, D. B. Shwartz, A.L. Sibidanov, D.N. Shemyakin, S.S. Gribanov, N.M. Ryskulov, Yu. M. Shatunov, A.S. Kasaev, I.B. Logashenko, A.L. Erofeev, G.P. Razuvaev, A.N. Amirkhanov, N.S. Bashtovoy, Yu.V. Yudin, V.Sh. Banzarov, Yu.N. Pestov, F.V. Ignatov, E. P. Solodov, A.A. Korobov, Vassili Kazanin, V.S. Okhapkin, and A.V. Bragin

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, 0103 physical sciences, Detector, Analytical chemistry, 010306 general physics, 01 natural sciences, Luminosity
Abstract

A search for the process e+e−→ D*0(2007) has been performed with the CMD-3 detector at the VEPP-2000 e+e−-collider. Two main decay modes of the D*0(2007) decay, D0π0 and D0γ, followed by D0 → K+π−π+π−are used in this analysis. With an integrated luminosity of 3.7 pb−1 collected at the center-of-mass energy Ec.m. =2006.62 MeV our preliminary upper limit is BD*0→e+ e− −6 at 90%C.L.

Published
2019

34. An amplitude analysis of the process e+e-→ 4π in the center-of-mass energy range 900–2000 MeV with the CMD3 detector at the VEPP-2000 e+e- collider

Author

S.E. Gayazov, Alexey Talyshev, A.A. Ruban, A.E. Kuzmenko, Yu. A. Rogovsky, E.A. Kozyrev, A.V. Bragin, Yu. M. Shatunov, V.M. Titov, S.I. Eidelman, Yu.V. Yudin, B.A. Shwartz, Alexey Anisenkov, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, V.S. Okhapkin, D. B. Shwartz, Yu.N. Pestov, A.L. Sibidanov, N.S. Bashtovoy, A.E. Ryzhenenkov, R.R. Akhmetshin, A.S. Popov, E. P. Solodov, A.A. Korobov, P.A. Lukin, N.M. Ryskulov, P. Krokovny, A.S. Kuzmin, P. Yu. Shatunov, I. A. Koop, K.Yu. Mikhailov, A. V. Semenov, Vassili Kazanin, S.V. Karpov, L.B. Epshteyn, A.N. Amirkhanov, D.N. Grigoriev, D.E. Berkaev, G.V. Fedotovich, G.P. Razuvaev, A.E. Bondar, V.M. Aulchenko, A.N. Kozyrev, V.Sh. Banzarov, I.B. Logashenko, F.V. Ignatov, A. N. Kirpotin, D.N. Shemyakin, Ilya Zemlyansky, S.S. Gribanov, A.L. Erofeev, D.A. Epifanov, and A.A. Grebenuk

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, QC1-999, Detector, 01 natural sciences, law.invention, Nuclear physics, Amplitude, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Center of mass, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

A large data sample of e+e-→ 4π collected by the CMD-3 experiment at the VEPP-2000 e+ e− collider allowed for an amplitude analysis of the process e+e−→ 4π in the center-of-mass energy range 900–2000 MeV. Various intermediate components were distinguished and dominance of the ωπ0 and a1π amplitudes has been proved.

Published
2019

35. Study of the process e+e−→3(π+π−) in the c.m. energy range 1.5–2.0 GeV with the CMD-3 detector

Author

E.A. Perevedentsev, A.S. Kasaev, V.Sh. Banzarov, S.S. Gribanov, A.N. Amirkhanov, A.L. Erofeev, P.A. Lukin, S.V. Karpov, Yu.V. Yudin, I.B. Logashenko, D. Epifanov, A.E. Bondar, A.S. Kuzmin, G.P. Razuvaev, A. V. Semenov, F.V. Ignatov, E. P. Solodov, D.N. Shemyakin, A.A. Korobov, S.I. Eidelman, Ilya Zemlyansky, Alexey Talyshev, V.M. Aulchenko, M.V. Timoshenko, D.E. Berkaev, E.A. Kozyrev, Vassili Kazanin, A.A. Grebenuk, Alexey Anisenkov, A.N. Kozyrev, L.B. Epshteyn, D. B. Shwartz, P. Krokovny, A.L. Sibidanov, B.A. Shwartz, A.E. Ryzhenenkov, A.V. Bragin, R.R. Akhmetshin, V.S. Okhapkin, D.N. Grigoriev, F. Grancagnolo, A. P. Lysenko, I. A. Koop, N.S. Bashtovoy, V.M. Titov, G.V. Fedotovich, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, A.S. Popov, K.Yu. Mikhailov, Yu. M. Shatunov, S.E. Gayazov, A.A. Ruban, A.E. Kuzmenko, Yu.N. Pestov, and N.M. Ryskulov

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), law, Electron–positron annihilation, Detector, Intermediate state, Atomic physics, Collider, Energy (signal processing), law.invention
Abstract

The cross section of the process e + e − → 3 ( π + π − ) π 0 has been measured for the first time using a data sample of 56.7 pb−1 collected with the CMD-3 detector at the VEPP-2000 e + e − collider. 632±32 signal events have been selected in the center-of-mass energy range 1.6–2.0 GeV. A study of dynamics of seven-pion production allows one to extract contributions of the dominated 2 ( π + π − ) ω and 2 ( π + π − ) η intermediate states.

Published
2013

36. Cross section measurement of the process e+e− → K+K−π+π− at the VEPP 2000 collider with the CMD-3 detector

Author

N.S. Bashtovoy, E.A. Kozyrev, A.E. Bondar, L.B. Epshteyn, V.S. Okhapkin, V.Sh. Banzarov, A.S. Popov, E. P. Solodov, A.A. Korobov, G.P. Razuvaev, A. A. Grebenuk, R.R. Akhmetshin, S.E. Gayazov, A.E. Ryzhenenkov, Vassili Kazanin, F.V. Ignatov, K.Yu. Mikhailov, Yu. M. Shatunov, Alexey Anisenkov, P.A. Lukin, S.S. Gribanov, A.A. Ruban, Ivan Koop, Alexei Talyshev, Sergei V. Karpov, D.N. Shemyakin, A.L. Erofeev, B. Shwartz, I.B. Logashenko, A.V. Bragin, D. B. Shwartz, S. Eidelman, A.N. Amirkhanov, A.N. Kozyrev, A.L. Sibidanov, D.A. Epifanov, Yu. A. Rogovsky, Yu.V. Yudin, Evgeny Perevedentsev, A. I. Vorobiov, G.V. Fedotovich, V. L. Ivanov, Ilya Zemlyansky, N.M. Ryskulov, V. M. Aulchenko, V.M. Titov, A.S. Kuzmin, D.N. Grigoriev, O.A. Kovalenko, Yu.N. Pestov, A.E. Kuzmenko, V.E. Shebalin, A. P. Lysenko, and P. Krokovny

Subjects
Physics, Range (particle radiation), Particle physics, Annihilation, Luminosity (scattering theory), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Hadron, Electron, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Collider, VEPP-2000
Abstract

Experiments with the CMD-3 detector at the electron-positron collider VEPP-2000 started in 2010. CMD-3 is a general purpose detector designed to study e+e− annihilation into hadrons in the center-of-mass (c.m.) energy range from 0.3 up to2 GeV. The cross section of the process e+e− → K+ K−π+π− has been measured using 23 pb−1 of integrated luminosity collected in the c.m. energy range 1.5 – 2.0 GeV.

Published
2016

37. Measurement of ϕ(1020) meson leptonic width with CMD-2 detector at VEPP-2M collider

Author

A. A. Grebenuk, A.E. Bondar, I.B. Logashenko, P.A. Lukin, N.M. Ryskulov, P. Krokovny, A.A. Ruban, S.I. Redin, A.S. Kuzmin, N. Gabyshev, S.I. Eidelman, D. Epifanov, D.N. Grigoriev, V.Sh. Banzarov, B.A. Shwartz, R.R. Akhmetshin, G.V. Fedotovich, A.S. Zaitsev, A. P. Lysenko, B.I. Khazin, K.Yu. Mikhailov, E.A. Perevedentsev, S.V. Karpov, A.V. Bragin, L.M. Barkov, A.L. Sibidanov, N.S. Bashtovoy, Yu. M. Shatunov, I. A. Koop, F.V. Ignatov, I.G. Snopkov, S.E. Baru, Yu.V. Yudin, E. P. Solodov, V.M. Aulchenko, A.S. Popov, Vassili Kazanin, and V.S. Okhapkin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, law, Hadron spectroscopy, Analytical chemistry, Resonance, Collider, law.invention
Abstract

The ϕ(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance ( ϕ → K + K − , K L 0 K S 0 , π + π − π 0 , η γ ) studied with the CMD-2 detector at the VEPP-2M e + e − collider. The following value has been obtained: Γ ( ϕ → e + e − ) = 1.235 ± 0.006 ± 0.022 keV . The ϕ ( 1020 ) meson parameters in four main decay channels have been also recalculated: B ( ϕ → K + K − ) = 0.493 ± 0.003 ± 0.007 , B ( ϕ → K L K S ) = 0.336 ± 0.002 ± 0.006 , B ( ϕ → π + π − π 0 ) = 0.155 ± 0.002 ± 0.005 , B ( ϕ → η γ ) = 0.0138 ± 0.0002 ± 0.0002 .

Published
2011

38. Measurement of e+e−→ϕ→K+K− cross section with CMD-2 detector at VEPP-2M collider

Author

D. Epifanov, S.E. Baru, E.A. Perevedentsev, A.E. Bondar, I. A. Koop, Yu. M. Shatunov, A.L. Sibidanov, A.A. Grebeniuk, L.M. Barkov, I.G. Snopkov, B.I. Khazin, N.M. Ryskulov, V.S. Okhapkin, Yu.V. Yudin, D.V. Bondarev, P. Krokovny, I.B. Logashenko, B.A. Shwartz, S.V. Karpov, G.V. Fedotovich, A.S. Kuzmin, N.S. Bashtovoy, V.M. Aulchenko, A. P. Lysenko, A.S. Popov, P.A. Lukin, K.Yu. Mikhailov, N. Gabyshev, A.A. Ruban, S.I. Redin, E. P. Solodov, V.Sh. Banzarov, A.V. Bragin, R.R. Akhmetshin, Vassili Kazanin, D.N. Grigoriev, S.I. Eidelman, and F.V. Ignatov

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Annihilation, Pair production, Meson, Antimatter, Electron–positron annihilation, Hadron, Analytical chemistry, Atomic physics, Lepton
Abstract

The process e + e − → ϕ → K + K − has been studied with the CMD-2 detector using about 542 000 events detected in the center-of-mass energy range from 1.01 to 1.034 GeV. The systematic error of the cross section is estimated to be 2.2%. The ϕ ( 1020 ) meson parameters in the ϕ → K + K − decay channel have been measured: σ 0 ( ϕ → K + K − ) = 2016 ± 8 ± 44 nb , m ϕ = 1019.441 ± 0.008 ± 0.080 MeV / c 2 , Γ ϕ = 4.24 ± 0.02 ± 0.03 MeV , B e + e − B K + K − = ( 14.27 ± 0.05 ± 0.31 ) × 10 −5 .

Published
2008

39. Study of the processes e+e−→ηγ, π0γ→3γ in the c.m. energy range 600–1380 MeV at CMD-2

Author

S.I. Eidelman, E.P. Solodov, V.A. Sidorov, K.Yu. Mikhailov, A.S. Popov, D.N. Grigoriev, S.G. Zverev, I.N. Nesterenko, F.V. Ignatov, A.A. Grebeniuk, D.V. Bondarev, A. Baratt, B.A. Shwartz, A.N. Skrinsky, A.S. Zaitsev, Yu.E. Lischenko, N.M. Ryskulov, A.G. Shamov, I.A. Koop, I.G. Snopkov, A.A. Ruban, A.E. Bondar, Yu.V. Yudin, D.A. Gorbachev, N.I. Gabyshev, L.M. Barkov, B.L. Roberts, V.S. Okhapkin, R.R. Akhmetshin, G.V. Fedotovitch, P.A. Lukin, Yu. M. Shatunov, B.I. Khazin, P.P. Krokovny, A.S. Kuzmin, S.V. Karpov, A.V. Bragin, D.A. Epifanov, S. I. Redin, A. A. Valishev, A.I. Milstein, V.F. Kazanin, V.Sh. Banzarov, J.A. Thompson, A.L. Sibidanov, N.S. Bashtovoy, V.M. Aulchenko, I.B. Logashenko, N.I. Root, and A. V. Otboev

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, Dalitz plot, Atomic physics, 010306 general physics, 01 natural sciences, Positron annihilation
Abstract

The processes e + e − → η γ , π 0 γ → 3 γ have been studied in the c.m. energy range 600–1380 MeV with the CMD-2 detector. The following branching ratios have been determined: B ( ρ 0 → η γ ) = ( 3.21 ± 1.39 ± 0.20 ) × 10 −4 , B ( ω → η γ ) = ( 4.44 −1.83 +2.59 ± 0.28 ) × 10 −4 , B ( ϕ → η γ ) = ( 1.373 ± 0.014 ± 0.085 ) × 10 −2 , B ( ρ 0 → π 0 γ ) = ( 6.21 −1.18 +1.28 ± 0.39 ) × 10 −4 , B ( ω → π 0 γ ) = ( 9.06 ± 0.20 ± 0.57 ) × 10 −2 , B ( ϕ → π 0 γ ) = ( 1.258 ± 0.037 ± 0.077 ) × 10 −3 .

Published
2005

40. Update: A reanalysis of hadronic cross section measurements at CMD-2

Author

Semen Eidelman, M. A. Nikulin, L.M. Barkov, A. I. Milstein, D. Epifanov, E.V. Anashkin, P.Yu. Stepanov, A.E. Bondar, B. L. Roberts, V.A. Sidorov, E. A. Kuraev, L.M. Kurdadze, Yu. M. Shatunov, Pavel Krokovny, E. P. Solodov, Andrej Arbuzov, J. A. Thompson, V. W. Hughes, J. P. Miller, D.V. Bondarev, G.V. Fedotovich, Andrey Vladimirovich Bogdan, N.M. Ryskulov, A.S. Zaitsev, Vladimir Smakhtin, R.R. Akhmetshin, B. Shwartz, A.S. Kuzmin, D.A. Gorbachev, A.L. Sibidanov, A.S. Popov, A. Baratt, P.A. Lukin, K.Yu. Mikhailov, Yu.E Lischenko, Vassili Kazanin, N. Gabyshev, V.Sh. Banzarov, A. A. Grebenuk, A.N. Skrinsky, I. Logashenko, B.I. Khazin, N.I. Root, F.V. Ignatov, and D.N. Grigoriev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Luminosity (scattering theory), Pion, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Hadron, 010306 general physics, 01 natural sciences
Abstract

The updated results of the precise measurements of the processes e + e − → ρ → π + π − , e + e − → ω → π + π − π 0 and e + e − → φ → K 0 L K 0 S performed by the CMD-2 Collaboration are presented. The update appeared necessary due to an overestimate of the integrated luminosity in previous analyses.

Published
2004

41. Study of the process e+e−→K0LK0S in the c.m. energy range 1.05–1.38 GeV with CMD-2

Author

R.R. Akhmetshin, V.M. Aulchenko, V.Sh. Banzarov, L.M. Barkov, S.E. Baru, N.S. Bashtovoy, A.E. Bondar, D.V. Bondarev, A.V. Bragin, S.K. Dhawan, S.I. Eidelman, D.A. Epifanov, G.V. Fedotovich, N.I. Gabyshev, D.A. Gorbachev, A.A. Grebeniuk, D.N. Grigoriev, V.W. Hughes, F.V. Ignatov, S.V. Karpov, V.F. Kazanin, B.I. Khazin, I.A. Koop, P.P. Krokovny, A.S. Kuzmin, I.B. Logashenko, P.A. Lukin, A.P. Lysenko, K.Yu. Mikhailov, I.N. Nesterenko, V.S. Okhapkin, A.V. Pak, A.A. Polunin, A.S. Popov, B.L. Roberts, N.I. Root, A.A. Ruban, N.M. Ryskulov, A.G. Shamov, Yu.M. Shatunov, B.A. Shwartz, A.L. Sibidanov, V.A. Sidorov, A.N. Skrinsky, I.G. Snopkov, E.P. Solodov, P.Yu. Stepanov, A.I. Sukhanov, J.A. Thompson, Yu.V. Yudin, and S.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, 01 natural sciences, Omega, High Energy Physics - Experiment, 3. Good health, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

The process $e^+e^- \to K^0_L K^0_S$ has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only., Comment: 12 pages, 3 figures, uses elsart.cls, submitted to Physics Letters B

Published
2003

42. Measurement of the cross section for the process e + e − → K L 0 K S 0 in the energy range 2E=1.05–1.38 GeV with the CMD-2 detector at VEPP-2M

Author

E.V. Anashkin, A. P. Lysenko, L.M. Barkov, D.V. Chernyak, A.A. Grebeniuk, A.G. Shamov, E. P. Solodov, V.P. Smakhtin, N.I. Root, N.M. Ryskulov, V.A. Sidorov, F.V. Ignatov, W. V. Hughes, A.S. Kuzmin, Satish Dhawan, P. Krokovny, D.A. Gorbachev, B.I. Khazin, Igor Nesterenko, Yu. M. Shatunov, A.L. Sibidanov, Vassili Kazanin, G.V. Fedotovich, A.A. Ruban, I.B. Logashenko, N.S. Bashtovoy, P.Yu. Stepanov, V.Sh. Banzarov, S.E. Baru, Yu.V. Yudin, L.M. Kurdadze, I.G. Snopkov, J. A. Thompson, A.A. Polunin, V.S. Okhapkin, A.I. Sukhanov, D.V. Bondarev, A.V. Bragin, B.A. Shwartz, K.Yu. Mikhailov, S.G. Zverev, A.S. Popov, P.A. Lukin, R.R. Akhmetshin, A.N. Skrinsky, N. Gabyshev, B. L. Roberts, I. A. Koop, V.M. Aulchenko, A.E. Bondar, S.V. Karpov, D.N. Grigoriev, and S.I. Eidelman

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Meson, Hadron, Detector, Elementary particle, Atomic and Molecular Physics, and Optics, Particle identification, law.invention, Nuclear physics, Cross section (physics), law, Collider
Abstract

The cross section for the process e + e − → K L 0 K S 0 is measured by using approximately 1000 events recorded by the CMD-2 detector at the VEPP-2M collider in the energy range from 1.05 to 1.38 GeV.

Published
2002

43. Z-chamber of the CMD-3 detector in the reconstruction of the track longitudinal coordinate

Author

Yu. A. Rogovsky, V.M. Titov, G.V. Fedotovich, V.Sh. Banzarov, S.I. Eidelman, V.S. Okhapkin, V.E. Shebalin, A.I. Vorobiov, V. L. Ivanov, N.S. Bashtovoy, Yu.V. Yudin, P.A. Lukin, S.E. Gayazov, D.N. Grigoriev, A.A. Ruban, D.E. Berkaev, A.E. Kuzmenko, A.S. Kasaev, A.V. Bragin, N.M. Ryskulov, L.B. Epshteyn, A.S. Popov, A.N. Amirkhanov, K.Yu. Mikhailov, D. B. Shwartz, Yu. M. Shatunov, A.L. Sibidanov, I. A. Koop, A.A. Grebenuk, A.S. Kuzmin, F.V. Ignatov, A. P. Lysenko, E. P. Solodov, P. Krokovny, D.N. Shemyakin, A.A. Korobov, V.M. Aulchenko, E.A. Perevedentsev, Yu.N. Pestov, A.N. Kozyrev, D. Epifanov, S.S. Gribanov, A.L. Erofeev, Vassili Kazanin, Alexey Talyshev, E.A. Kozyrev, A.E. Bondar, S.V. Karpov, Alexey Anisenkov, I.B. Logashenko, G.P. Razuvaev, B.A. Shwartz, A.E. Ryzhenenkov, and R.R. Akhmetshin

Subjects
Physics, Annihilation, Physics::Instrumentation and Detectors, Track (disk drive), Hadron, Detector, Particle detector, Computational physics, law.invention, law, Calibration, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, Mathematical Physics
Abstract

Since 2010 the CMD-3 detector has been collecting data at the e+e− collider VEPP-2000 in the Budker Institute of Nuclear Physics. One of the main goals of experiments with CMD-3 detector is the precise measurement of the cross sections of the e+e− annihilation into hadrons. For a large number of processes the main source of systematic uncertainty in cross sections determination due to accuracy of polar angles determination of the tracks. Z-chamber is used for the reconstruction of the track longitudinal coordinate which is with low systematic uncertainty. The measurement of longitudinal coordinates is performed by the collecting of the charge which is induced on the strip cathodes of the Z-chamber. The algorithms of the reconstruction of cathodes clusters and calibration procedure are presented.

Published
2017

44. Study of the processes e+e− → K+K−π+π−, ϕη with the CMD-3 detector at the e+e− collider VEPP-2000

Author

S.E. Gayazov, E. M. Gromov, A.A. Ruban, B.A. Shwartz, A.E. Kuzmenko, N. Yu. Muchnoi, A.E. Ryzhenenkov, A.S. Popov, I.B. Logashenko, K.Yu. Mikhailov, Alexey Anisenkov, V.M. Titov, A.V. Bragin, V.M. Aulchenko, P. Yu. Shatunov, P. Krokovny, Yu. M. Shatunov, G.P. Razuvaev, A.N. Kozyrev, A.L. Romanov, D.N. Shemyakin, D. B. Shwartz, E.A. Perevedentsev, O.A. Kovalenko, V.E. Shebalin, S.V. Karpov, G.V. Fedotovich, A.I. Vorobiov, S.I. Eidelman, Yu.N. Pestov, N.S. Bashtovoy, A.L. Sibidanov, I. A. Koop, B.I. Khazin, N.M. Ryskulov, V.Sh. Banzarov, D.E. Berkaev, Alexey Talyshev, A.S. Kuzmin, A.E. Bondar, A.A. Grebenuk, F.V. Ignatov, E.A. Kozyrev, A.L. Erofeev, D. A. Epifanov, P.A. Lukin, L.B. Epshteyn, D.N. Grigoriev, E. P. Solodov, Vassili Kazanin, Yu.V. Yudin, V.S. Okhapkin, R.R. Akmetshin, and Yu. A. Rogovsky

Subjects
Nuclear physics, Physics, Range (particle radiation), law, QC1-999, Detector, Collider, VEPP-2000, lcsh:Physics, lcsh:QC1-999, law.invention
Abstract

We report preliminary results on the measurement of the cross sections of the processes e + e − → K + K − π + π − and e + e − → φη in the c.m.energy range from 1.5 GeV to 2 GeV with the CMD-3 detector. The cross sections of these processes agree with BaBar results and have better accuracy.

Published
2014

45. Study of the process e+e− → 2(π+π−π0) with the CMD-3 detector at VEPP-2000 collider

Author

Alexey Anisenkov, P. Yu. Shatunov, N.M. Ryskulov, A.L. Sibidanov, P. Krokovny, I.B. Logashenko, B.I. Khazin, Alexey Talyshev, E.A. Kozyrev, D. A. Epifanov, G.V. Fedotovich, V.Sh. Banzarov, G.P. Razuvaev, A.S. Popov, N. Yu. Muchnoi, A.V. Bragin, E.A. Perevedentsev, I. A. Koop, S.I. Eidelman, V.E. Shebalin, A.I. Vorobiov, A.E. Bondar, P.A. Lukin, K.Yu. Mikhailov, V.M. Titov, E. P. Solodov, L.B. Epshteyn, N.S. Bashtovoy, Yu. M. Shatunov, A.A. Grebenuk, B.A. Shwartz, D.N. Grigoriev, A.E. Ryzhenenkov, Yu.V. Yudin, O.A. Kovalenko, S.V. Karpov, Yu.N. Pestov, Vassili Kazanin, A.S. Kuzmin, A.E. Kuzmenko, R.R. Akmetshin, V.S. Okhapkin, Yu. A. Rogovsky, S.E. Gayazov, D.N. Shemyakin, A.A. Ruban, F.V. Ignatov, E. M. Gromov, A.L. Erofeev, D. B. Shwartz, D.E. Berkaev, V.M. Aulchenko, A.N. Kozyrev, and A.L. Romanov

Subjects
Physics, Range (particle radiation), Annihilation, Physics::Instrumentation and Detectors, QC1-999, Hadron, Detector, lcsh:QC1-999, law.invention, Nuclear physics, General purpose, law, High Energy Physics::Experiment, Collider, VEPP-2000, Energy (signal processing), lcsh:Physics
Abstract

Since 2010 the CMD-3 detector has been collecting data at the VEPP-2000 e + e − collider. CMD-3 is a general purpose detector designed to study e + e − annihilation into hadrons in the center-of-mass (c.m.) energy range from 0.3 up to 2 GeV. Preliminary results for the e + e − → 2(π + π − π 0 ) cross section were obtained in the c.m. energy range from 1.5 up to 2 GeV. The analysis is based on a data sample of 22 pb −1 .

Published
2014

46. Study of conversion decays φ→ηe+e−, η→e+e−γ and η→π+π−e+e− at CMD-2

Author

Alexander Valishev, M. Arpagaus, A.S. Kuzmin, V.A. Sidorov, N.I. Root, Igor Nesterenko, L.M. Kurdadze, M. Lechner, A.V. Otboev, A.A. Grebeniuk, P.Yu. Stepanov, B.A. Shwartz, V.M. Aulchenko, V.S. Okhapkin, A.G. Shamov, R.R. Akhmetshin, A.V. Bragin, A.S. Popov, V.Sh. Banzarov, V. W. Hughes, V.M. Titov, S.I. Eidelman, P.M. Ivanov, J. A. Thompson, S.G. Zverev, E. P. Solodov, K.Yu. Mikhailov, G.V. Fedotovitch, A.N. Skrinsky, Yu. M. Shatunov, N.M. Ryskulov, S.V. Karpov, Vassili Kazanin, Ivan Koop, A.L. Sibidanov, N.S. Bashtovoy, I.B. Logashenko, I.G. Snopkov, D.V. Bondarev, D.V. Chernyak, P.A. Lukin, A.I. Sukhanov, D.N. Grigoriev, P. Krokovny, A.A. Ruban, V.P. Smakhtin, Yu.V. Yudin, E.A. Perevedentsev, L.M. Barkov, E.V. Anashkin, T.A. Purlatz, F.V. Ignatov, N. Gabyshev, A.E. Bondar, and B.I. Khazin

Subjects
Physics, Nuclear and High Energy Physics, Meson, Electron–positron annihilation, Mass spectrum, Physical chemistry, Atomic physics
Abstract

Using 15.1 pb −1 of data collected by CMD-2 in the φ -meson energy range, the branching ratios of the following conversion decays have been measured: B ( φ → ηe + e − )=(1.14±0.10±0.06)×10 −4 , B ( η → e + e − γ )=(7.10±0.64±0.46)×10 −3 , B ( η → π + π − e + e − )=(3.7 +2.5 −1.8 ±0.3)×10 −4 . The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B ( φ → ημ + μ − ) −6 , B ( η → e + e − e + e − ) −5 .

Published
2001

47. Observation of the φ→η′γ decay with four charged particles and photons in the final state

Author

A.S. Popov, A.V. Otboev, K.Yu. Mikhailov, Igor Nesterenko, V.S. Okhapkin, A.V. Bragin, E.A. Perevedentsev, P.Yu. Stepanov, Yu. M. Shatunov, V. W. Hughes, V.Sh. Banzarov, P.M. Ivanov, Ivan Koop, L.M. Barkov, E. P. Solodov, I.G. Snopkov, N.I. Root, Alexander Valishev, R.R. Akhmetshin, A.S. Kuzmin, Vassili Kazanin, N.S. Bashtovoy, D.V. Chernyak, V.M. Aulchenko, A.A. Ruban, F.V. Ignatov, P. Krokovny, S.V. Karpov, S.I. Redin, Yu.V. Yudin, A.L. Sibidanov, N.M. Ryskulov, G.V. Fedotovitch, M. Arpagaus, D.N. Grigoriev, A.A. Grebeniuk, A.G. Shamov, V.P. Smakhtin, J. A. Thompson, A.I. Sukhanov, S.I. Eidelman, D.V. Bondarev, B.A. Shwartz, S.G. Zverev, L.M. Kurdadze, A.N. Skrinsky, P.A. Lukin, M. S. Korostelev, V.A. Sidorov, T.A. Purlatz, N. Gabyshev, I.B. Logashenko, E.V. Anashkin, V.M. Titov, A.E. Bondar, and B.I. Khazin

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Photon, Branching fraction, Electron–positron annihilation, State (functional analysis), Decay chain, Atomic physics, Charged particle
Abstract

Using 11.6 pb −1 of data collected in the energy range 0.864-1.06 GeV by CMD-2 at VEPP-2M, the rare decay mode φ → η ′ γ was observed via the decay chain η ′→ π + π − η , η → π + π − π 0 or η → π + π − γ . The following branching ratio was obtained: Br(φ→η′γ)= 4.9 +2.2 −1.8 ±0.6 ×10 −5 .

Published
2000

48. Observation of the decay

Author

Alexander Valishev, I.G. Snopkov, N.I. Root, P.Yu. Stepanov, P.M. Ivanov, A.V. Bragin, V.Sh. Banzarov, Yu. M. Shatunov, N.M. Ryskulov, E. P. Solodov, Yu.V. Yudin, A.I. Sukhanov, B.I. Khazin, E.A. Perevedentsev, R.R. Akhmetshin, D.N. Grigoriev, Vassili Kazanin, S.V. Karpov, D.V. Chernyak, L.M. Barkov, A.L. Sibidanov, M. Arpagaus, F.V. Ignatov, V.P. Smakhtin, N.S. Bashtovoy, J. A. Thompson, A.V. Otboev, A.S. Popov, A.S. Kuzmin, I.B. Logashenko, G.V. Fedotovitch, V.S. Okhapkin, E.V Anashkin, V. W. Hughes, B.A. Shwartz, K.Yu. Mikhailov, M. S. Korostelev, A.A Ruban, A.N. Skrinsky, S.I. Eidelman, P.A. Lukin, P. Krokovny, A.E. Bondar, S.G. Zverev, Igor Nesterenko, V.A. Sidorov, T.A. Purlatz, L.M. Kurdadze, N. Gabyshev, I. A. Koop, S.I. Redin, A. I. Milstein, V.M. Titov, D.V. Bondarev, V.M. Aulchenko, A.A. Grebeniuk, and A.G. Shamov

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Crystallography, Annihilation, Pion, Meson, OZI rule, Branching fraction, Atomic physics
Abstract

Using 11.6 pb −1 of data collected in the energy range 0.984–1.06GeV by CMD-2 at VEPP-2M, the cross section of the reaction e + e − →π + π − π + π − hasbeen studied. For the firsttime an interference patternwas observed in the energy dependence of the cross section near theφ meson. The branching ratio of the φ → π + π − π + π − decay doublesuppressed by the G-parity and OZI rule is measuredBr(φ → π + π − π + π − ) = (3.93 ±1.74 ±2.14) ·10 −6 .The upper limits have been placed for the decays φ → π + π − π + π − π 0 and φ → ηπ + π − Br(φ → π + π − π + π − π 0 ) < 4.6 ·10 −6 90%CL,Br(φ → ηπ + π − ) < 1.8 ·10 −5 90%CL. 1 Introduction Production of four pions in e + e − annihilation is now well studied in the c.m.energy range 1.05 to 2.5 GeV (see [ 1] and references therein). Results onthe measurements of the cross section of the reaction e + e − → π + π − π + π − in the energy range from 0.60 to 0.97 GeV as well as the probability of theρ 0 meson decay into the π + π − π + π −

Published
2000

49. New Constraint on the Existence of theμ+→e+γDecay

Author

H. Natori, X. Bai, L. Galli, C. Cerri, Stefan Ritt, P. W. Cattaneo, Flavio Gatti, Giovanni Signorelli, Yasunori Fujii, M. Panareo, T. Iwamoto, Y. Hisamatsu, O. Kiselev, Y. Nishimura, Akira Yamamoto, A. Maki, A. M. Baldini, C. Voena, A. Graziosi, A. S. Korenchenko, P.R. Kettle, F. Sergiampietri, E. Baracchini, B. Golden, C. Bemporad, A.S. Popov, Roberto Di Nardo, F.V. Ignatov, Z. You, Wataru Ootani, B.I. Khazin, N. Kravchuk, G. Cavoto, F. Tenchini, J. Egger, A. de Bari, Satoru Yamashita, G. Piredda, Tomiyoshi Haruyama, S. Yamada, Ryu Sawada, D. Mzavia, D.N. Grigoriev, G. Boca, F. Xiao, Fabrizio Cei, N. Khomotov, G. M. A. Lim, M. De Gerone, Takehiko Mori, Yusuke Uchiyama, W. R. Molzon, Marco Grassi, M. Hildebrandt, Donato Nicolo, S. Suzuki, S. Dussoni, M. Rossella, D. Zanello, D. Kaneko, Yu.V. Yudin, Satoshi Mihara, Tadayoshi Doke, F. Renga, E. Ripiccini, J. Adam, Angela Papa, Hajime Nishiguchi, and C. Topchyan

Subjects
Physics, Particle physics, Muon, Branching fraction, General Physics and Astronomy, Supersymmetry, Lepton
Abstract

The analysis of a combined data set, totaling $3.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$ stopped muons on target, in the search for the lepton flavor violating decay ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\gamma}$ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of $5.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

Published
2013

50. The MEG detector for μ +→e+ γ decay search

Author

F. Renga, C Topchyan, Angela Papa, A. Graziosi, Yasuhiro Nishimura, Donato Nicolo, Bi Khazin, Hajime Nishiguchi, Am Baldini, M. Rossella, N. P. Kravchuk, E. Ripiccini, G. M. A. Lim, Y. Hisamatsu, S. Galeotti, N. Curalli, Malte Hildebrandt, Luca Galli, A.S. Popov, D. Kaneko, K. Ozone, D. Mzavia, M. De Gerone, Roberto Di Nardo, C. Cerri, M. Corbo, F. Tenchini, G. Piredda, S. Yamada, Giovanni Signorelli, M. Schneebeli, H. Natori, C. Bemporad, S. Yamamoto, A. S. Korenchenko, Flavio Gatti, L. Del Frate, Ryu Sawada, Pw Cattaneo, D. Zanello, R. Valle, Satoshi Mihara, T. Iwamoto, W. R. Molzon, M. Panareo, K. Fratini, Pr Kettle, E Baracchini, Fabrizio Cei, F.V. Ignatov, X. Bai, Marco Grassi, S. Doke, C. Voena, F. Morsani, F. Raffaelli, Katsuyu Kasami, R. Pazzi, Wataru Ootani, Yuki Fujii, G. Gallucci, Satoru Yamashita, F Xiao, G. Cavoto, Gianluigi Boca, A. Maki, A. de Bari, Tomiyoshi Haruyama, Stefan Ritt, Yv Yudin, J. Adam, O. Kiselev, F. Sergiampietri, D.N. Grigoriev, S. Suzuki, Takehiko Mori, Yusuke Uchiyama, S. Dussoni, B Golden, J. Egger, J., Adam, X., Bai, A. M., Baldini, E., Baracchini, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, F., Cei, C., Cerri, M., Corbo, N., Curalli, A., De Bari, M., De Gerone, L., Del Frate, S., Doke, S., Dussoni, J., Egger, K., Fratini, Y., Fujii, L., Galli, S., Galeotti, G., Gallucci, F., Gatti, B., Golden, M., Grassi, A., Graziosi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, D., Kaneko, K., Kasami, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, G., Lim, A., Maki, S., Mihara, W., Molzon, T., Mori, F., Morsani, D., Mzavia, R., Nardò, H., Natori, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, K., Ozone, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Raffaelli, F., Renga, E., Ripiccini, S., Ritt, M., Rossella, R., Sawada, M., Schneebeli, F., Sergiampietri, G., Signorelli, S., Suzuki, F., Tenchini, C., Topchyan, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, S., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
Physics, Antiparticle, Muon, Spectrometer, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Photon energy, Charged Lepton Flavor Violation, Particle detector, Lepton, Nuclear physics, Particle decay, Positron, Physics::Accelerator Physics, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay μ +→e+ γ by using one of the most intense continuous μ + beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus., The European Physical Journal C, 73 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2013

Catalog

Books, media, physical & digital resources
See catalog results