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15 results on '"E.A. Kozyrev"'

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. Measurement of the branching fraction for the decay KS → πμν with the KLOE detector

Author

D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D'Uffizi, A. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V.L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E.A. Kozyrev, W. Krzemien, A. Kupsc, P.A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, S. Parzych, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E.P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

Based on a sample of 300 million KS mesons produced in ϕ→KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider we have measured the branching fraction for the decay KS→πμν. The KS mesons are identified by the interaction of KL mesons in the detector. The KS→πμν decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of KL→πμν decays. A fit to the reconstructed muon mass distribution finds 7223±180 signal events. Normalising to the KS→π+π− decay events the result for the branching fraction is B(KS→πμν)=(4.56±0.11stat±0.17syst)×10−4. It is the first measurement of this decay mode and the result allows an independent determination of |Vus| and a test of the lepton-flavour universality. Keywords: e+e− collisions, K0 meson, Semileptonic decay

Published
2020
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6. Combined limit on the production of a light gauge boson decaying into μ+μ− and π+π−

Author

A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D'Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V.L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E.A. Kozyrev, W. Krzemien, A. Kupsc, P.A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E.P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

We searched for the μ+μ− decay of a light vector gauge boson, also known as dark photon, in the e+e−→μ+μ−γISR process by means of the Initial State Radiation (ISR) method. We used 1.93 fb−1 of data collected by the KLOE experiment at the DAΦNE ϕ-factory. No structures have been observed over the irreducible μ+μ− background. A 90% CL limit on the ratio ε2=α′/α between the dark coupling constant and the fine structure constant of 3×10−6–2×10−7 has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e+e−→π+π−γISR events. The combined 90% CL limit increases the sensitivity especially in the ρ–ω interference region and excludes ε2 greater than (13−2)×10−7. For dark photon masses greater than 600 MeV the combined limit is lower than 8 ×10−7 resulting more stringent than present constraints from other experiments. Keywords: e+e− Collisions, Dark forces, Gauge vector boson, Upper limits

Published
2018
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7. 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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8. 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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9. 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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10. 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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11. 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
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12. 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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13. 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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14. 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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15. 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

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