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121 results on '"R.R. Akhmetshin"'

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
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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
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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
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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
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5. 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
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6. 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
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7. 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
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8. 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
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9. 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
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10. 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
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11. 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
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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. Measuring the Radiation Energy Density of a Pulsed X-Ray Source

Author

Sergey Serednyakov, D.N. Grigoriev, Vassili Kazanin, E.A. Babichev, A.V. Timofeev, V. R. Groshev, G. V. Stavrietskiy, S. R. Korzhenevskiy, Alexey Talyshev, D. A. Shtol, R.R. Akhmetshin, A. A. Komarskiy, A. S. Romakhin, and A. S. Chepusov

Subjects
010302 applied physics, Materials science, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Energy flux, Radiant energy, Scintillator, 01 natural sciences, Bismuth germanate, Anode, Crystal, chemistry.chemical_compound, Optics, chemistry, 0103 physical sciences, business, Instrumentation, Energy (signal processing)
Abstract

A method is presented for measuring the energy density of X-ray pulses with a duration of approximately 200 ns from a source with an energy of 2–3 J in its discharge circuit. A bismuth germanate (BGO) scintillator crystal is used for measurements. The absolute calibration of the energy scale has been carried out by measuring the amplitude spectrum of cosmic muons. The energy flux of an X-ray pulse, measured at a distance of 1 m from the anode of the source, is 20 GeV/cm2.

Published
2019

16. 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

17. 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

18. 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

19. 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

20. Cross sections of hadronic reactions e + e − → K + K − nπ (n =1,2,3) measured with the CMD3 detector at the VEPP-2000 electron–positron collider

Author

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

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

We analyze the data on e + e − collisions at c.m.s. energies between 0.32 and 2 GeV collected in 2011–2013 with the CMD3 detector operating at the VEPP-3 e + e − collider of the Budker Institute of Nuclear Physics. The data correspond to an integrated luminosity of nearly 60 pb-1. Preliminary results e + e − → K + K − nπ (n = 1, 2, 3) on the reactions with two charged kaons in the final state are presented, and the procedure for estimating the integrated luminosity for each energy setting is described.

Published
2017

22. 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

23. Study of the processes e+e-→ K+K− + nπ (n = 1,2,3) with the CMD-3 detector at the VEPP-2000 electron-positron collider

Author

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

Subjects
Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Detector, Electron, 01 natural sciences, law.invention, Nuclear physics, Positron, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Energy (signal processing)
Abstract

The data sample collected in 2011-2013 at the c.m.s. energies between 0.32-2 GeV with the CMD-3 detector operating at the VEPP-2000 e+e− collider is analzed. The collected data corresponds to an integrated luminosity about ∼ 60pb−1. The techniques for determination of the integrated luminosity for each energy setting is described. Some preliminary results of the study of the processes e+e−→ K+ K− + nπ (n = 1,2,3) with two charged kaons in the final state are presented. These processes have several intermediate states, which are important to correctly descript the angular distributions of final particles and the cross sections dependence on the energy.

Published
2019

24. 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

25. Recent results of the hadronic cross section measurements with the CMD-3 detector at e+e− collider VEPP-2000

Author

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

Subjects
Physics, Luminosity (scattering theory), Meson, 010308 nuclear & particles physics, QC1-999, Hadron, Detector, Nuclear Theory, Form factor (quantum field theory), Dalitz plot, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, Nuclear Experiment, VEPP-2000
Abstract

A brief review of the recent results on the hadronic cross section measurements with the CMD-3 detector at the e+e− collider VEPP-2000 is given. Focus is made on the processes with charged kaons in multihadron events, which have a strong impact on strange meson spectroscopy and form factors that are important ingredients in the Dalitz plot analysis. Experimental data relevant to the topic are presented from the broad energy range covered by VEPP-2000 and compared to earlier measurements by the different collaborations. The analysis is based on the integrated luminosity of about 100 pb−1 collected in 2011, 2012 and 2017.

Published
2019

26. 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

27. CMD-3 Overview

Author

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

Subjects
Physics, Range (particle radiation), Muon, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Detector, Hadron, 01 natural sciences, law.invention, Calorimeter, Nuclear physics, Upgrade, law, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Collider, Nuclear Experiment, Energy (signal processing)
Abstract

The CMD-3 detector is installed at the VEPP-2000 e+e− collider at BINP (Novosibirsk, Russia). It is a general-purpose detector, equipped with a tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe calorimeter, TOF and muon systems. The main goal of experiments at CMD-3 is a study of exclusive modes of e+e−→ hadrons at energies $ \sqrt s \le $ GeV. In particular, these results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking was performed in 2011–2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. Here we present a survey of results of data analysis. Between 2013 and 2016 the collider and the detector were upgraded. The data taking resumed by the end of 2016. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. We discuss the upgrade and the first preliminary results from the new data.

Published
2019

28. 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

29. 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

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

Author

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

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, Detector, 01 natural sciences, law.invention, Nuclear physics, Angular distribution, law, 0103 physical sciences, 010306 general physics, Nucleon, Collider, Energy (signal processing)
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 − → p p ¯ 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 G E / G M .

Published
2016

31. Preliminary results of the cross-section measurement of e+e− → φ(1020)η process with the CMD-3 detector at VEPP-2000 collider

Author

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

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

We report preliminary results on the cross section of the process e+e− → φ(1020)η measured at 30 center-of-mass energy points in the range from 1.59 up to 2.0 GeV. Data analysis is based on the integrated luminosity of 22 pb−1 collected with the CMD-3 detector in 2011–2012. The obtained cross section agrees with the BaBar measurement and has better statistical accuracy.

Published
2016

32. Measurement of the e + e − → π+π−π0 cross section with the CMD-3 detector

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Detector, Atomic physics, 010306 general physics, 01 natural sciences, Energy (signal processing)
Abstract

The preliminary results of measurement of the e + e − → π+π−π0 cross section in the 1.05–2 GeV center-of-mass energy range with 30 pb–1 of experimental data collected using the CMD-3 detector are presented. The parameters of resonant states ω(1420) and ω(1650) are obtained.

Published
2017

33. 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

34. 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

35. The electronics for the electron calorimeter of the COMET experiment

Author

Yu.V. Yudin, Dz.V. Shoukovy, L.B. Epshteyn, R.R. Akhmetshin, and D.N. Grigogiev

Subjects
Physics, Signal processing, Muon, Calorimeter (particle physics), Analogue electronics, 010308 nuclear & particles physics, business.industry, Comet, Electron, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Optics, 0103 physical sciences, Electronics, business, Energy (signal processing)
Abstract

The goal of COMET experiment is to search for the coherent neutrinoless muon to electron conversion at the field of atomic nucleus. This process is strongly forbidden in the SM at level below 10−50.The goal of the COMET experiment is to reach unrivaled sensitivity of 3x10-15 at the first stage and of 3x10-17 at the final experiment. The background rate is extremely high, few MHz. The main criteria for selection of the useful events from the background ones is the energy of electron produced in an event. Hence, the Electron Calorimeter of the COMET experiment is used for measuring the energy of electrons and for events selection. It leads to the controversial requirements on the electronics to provide the fast response and low noise performance.For the Electron calorimeter a dedicated custom electronics has been developed. It includes front-end electronics, which implements a special technique of amplification and shaping for achieving a very low noise level along with fast response, and Pre-trigger electronics, which uses online signal processing for real-time determination of energy depositions with high resolution, thus providing a good selection of events by the deposited energy. The output signals shape of the analog electronics is determined by the decay time of LYSO scintillator, so the contribution from pileup is kept minimal as possible. The on-line energy resolution is comparable with off-line one and satisfies the experiment requirement of 5%.

Published
2018

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

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Anomalous magnetic dipole moment, Meson, 010308 nuclear & particles physics, Detector, Analytical chemistry, FOS: Physical sciences, 01 natural sciences, lcsh:QC1-999, Luminosity, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Center of mass, 010306 general physics, Energy (signal processing), lcsh:Physics
Abstract

The process e + e − → K + K − has been studied using 1.7 × 10 6 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 a μ K + 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 − → K S 0 K L 0 cross sections and compare it to the theoretical prediction.

Published
2018

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

Author

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

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

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

Published
2018

38. Investigation of the processes e + e − → 2 (π+π−π0) and e + e − → 3 (π+π−) with the aid of the CMD-3 detector

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Luminosity (scattering theory), law, Detector, Atomic physics, Collider, Atomic and Molecular Physics, and Optics, law.invention
Abstract

The cross sections for the processes e + e − → 2(π+π−π0) and e + e − → 3(π+π−) at c.m. energies in the range of 1.5–2 GeV were measured with the aid of the CMD-3 detector at the VEPP-2000 collider of the Budker Institute of Nuclear Physics (Novosibirsk, Siberian Branch, Russian Academy of Sciences). The integrated luminosity in the respective experiment was 22 pb−1.

Published
2015

39. 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

40. 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

41. 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

42. The Radiation Hard BGO Crystals for Astrophysics Applications

Author

D.N. Grigoriev, I.B. Chistokhin, Ya.V. Vasiliev, E.A. Babichev, Vassili Kazanin, R.R. Akhmetshin, Yu. A. Borovlev, N.V. Ivannikova, A.G. Postupaeva, V.N. Shlegel, and G.N. Kuznetsov

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Radioactive source, Gamma ray, Astrophysics, Radiation, Bismuth germanate, Crystal, chemistry.chemical_compound, Nuclear Energy and Engineering, chemistry, Irradiation, Electrical and Electronic Engineering, Radiation hardening
Abstract

The scintillation crystal bismuth germanate Bi 4 Ge 3 O 12 (BGO) is widely used in many applications. The developed in the Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia, unique technique allows routine production of top quality large sized BGO crystals. One of the important properties of the scintillation crystal is its radiation hardness. The intensive study of the radiation hardness of BGO crystals has been carried out by the collaboration of the institutes of Siberian Branch of the Russian Academy of Science, Novosibirsk. The influence on radiation hardness of the raw material purity and growth procedure has been studied. The final tests of the crystal radiation hardness were done by irradiation with gamma rays from 137Cs radioactive source. The degradation of a light output of the best crystals is less than 10% after irradiation with expected at astrophysics experiment at satellite doses of 10–100 krad. Based on results of this research, the radiation hard BGO crystals for “INTEGRAL” and “ASTRO-H” satellite missions have been made. The self-recovering of the crystal light output is clearly seen. The time scale of the self-recovery strongly depends on a dose of the irradiation. It is days for 1 krad irradiation, weeks - for 10 krad irradiation and much more time is required for 100 krad irradiation. The all irradiated with 100 krad dose completely recover after annealing. It reveals that will be no essential degradation if this dose will be integrated over years of operation.

Published
2014

43. Preliminary results on CMD-3 measurement of e+e−→ π+π− cross section

Author

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

Subjects
Physics, Range (particle radiation), Luminosity (scattering theory), 010308 nuclear & particles physics, QC1-999, Detector, 01 natural sciences, law.invention, Nuclear physics, Cross section (physics), law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, 010306 general physics, Collider
Abstract

The CMD-3 detector has been successfully collecting data at the electron-positron collider VEPP-2000 since December 2010. The first scan below 1 GeV for a π+π− measurement was performed in 2013. The collected data sample corresponds to about 18 pb−1 of integrated luminosity in this energy range. Analysis of the e+e−→ π+π− cross section is in progress. Status of this measurement are presented.

Published
2019

44. Current status of luminosity measurement with the CMD-3 detector at the VEPP-2000 collider

Author

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

Subjects
Physics, Range (particle radiation), Photon, Luminosity (scattering theory), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Nuclear physics, law, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider, VEPP-2000, Astrophysics::Galaxy Astrophysics, Energy (signal processing)
Abstract

The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 [1] in December 2010. The collected data sample corresponds to an integrated luminosity of 87 pb−1 in the c.m. energy range from 1.06 up to 2 GeV and 91 pb−1 from 0.32 to 1.06 GeV. The integrated luminosity was measured by counting e+e−→ e+e− and e+e−→ γγ events, allowing additional photons in the final state. Preliminary results of the luminosity measurement are presented for various energy ranges and its accuracy is estimated to be 1%.

Published
2019

45. 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

46. 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

47. 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

48. 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

49. 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

50. Upgrade of the CMD-3 BGO Endcap Calorimeter

Author

Vassili Kazanin, D.N. Grigoriev, R.R. Akhmetshin, Yu.V. Yudin, and A.E. Kuzmenko

Subjects
Physics, Nuclear and High Energy Physics, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Detector, Capacitance, Photodiode, law.invention, Upgrade, Nuclear Energy and Engineering, law, Nuclear electronics, Optoelectronics, High Energy Physics::Experiment, Electronics, Electrical and Electronic Engineering, business, Collider
Abstract

The BGO endcap calorimeter was successfully operated in the CMD-2 detector at the VEPP-2M collider. It consists of 680 BGO crystals each with a size of 25×25×150 mm3, arranged in two identical endcaps, with a total crystal weight of 450 kg. The light readout used vacuum phototriodes. The endcap calorimeter has now been upgraded to work in the CMD-3 detector at new collider VEPP-2000. The major part of the endcap calorimeter, the BGO crystals, remains the same. The main upgrade is the use of silicon PIN photodiodes and new electronics. Main reason to change photosensitive device is the strong non-uniform magnetic field in the endcap calorimeter volume so the vacuum photosensitive devices cannot operate in such magnetic fields. Also the available space for the endcap calorimeter space had to be reduced. The Hamamatsu PIN photodiode S3590-08 was chosen as the optimal solution, as they are insensitive to magnetic fields and are both compact and stable. An order of magnitude larger capacitance of silicon photodiodes requires design and produce new custom electronics. The upgrade is expected to bring an overall improvement of parameters. The endcap calorimeter has been installed in the detector and participates in data taking which started at 2010. The preliminary data analysis shows an improvement of the energy resolution compare to the CMD-2 detector.

Published
2013

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