Related papers: e+e- -> pi+pi-e+e-: a potential background for sig…

Measurement of the $e^+e^- \to \pi^0\gamma$ cross section in the energy range 1.075--2 GeV at SND

The process $e^+e^- \to \pi^0\gamma$ is studied with the SND detector at the VEPP-2000 $e^+e^-$ collider. Basing on data with an integrated luminosity of 41 pb$^{-1}$ recorded in 2010-2012 we measure the $e^+e^- \to \pi^0\gamma$ cross…

High Energy Physics - Experiment · Physics 2018-12-12 M. N. Achasov , A. Yu. Barnyakov , K. I. Beloborodov , A. V. Berdyugin , D. E. Berkaev , A. G. Bogdanchikov , A. A. Botov , T. V. Dimova , V. P. Druzhinin , V. B. Golubev , L. V. Kardapoltsev , A. S. Kasaev , A. G. Kharlamov , I. A. Koop , A. A. Korol , D. P. Kovrizhin , S. V. Koshuba , A. S. Kupich , R. A. Litvinov , K. A. Martin , N. A. Melnikova , N. Yu. Muchnoi , A. E. Obrazovsky , E. V. Pakhtusova , K. V. Pugachev , Yu. A. Rogovsky , A. I. Senchenko , S. I. Serednyakov , Z. K. Silagadze , P. Yu. Shatunov , Yu. M. Shatunov , D. A. Shtol , D. B. Shwartz , I. K. Surin , Yu. V. Usov , A. V. Vasiljev , V. V. Zhulanov

Production of Sigma{\pm}pi?pK+ in p+p reactions at 3.5 GeV beam energy

We study the production of Sigma^+-pi^+-pK^+ particle quartets in p+p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report evaluates the contribution of resonances like Lambda(1405$,…

Nuclear Experiment · Physics 2015-06-04 G. Agakishiev , A. Balanda , D. Belver , A. Belyaev , J. C. Berger-Chen , A. Blanco , M. Boehmer , J. L. Boyard , P. Cabanelas , E. Castro , S. Chernenko , T. Christ M. Destefanis , F. Dohrmann , A. Dybczak , E. Epple , L. Fabbietti , O. Fateev , P. Finocchiaro , P. Fonte , J. Friese , I. Fröhlich , T. Galatyuk , J. A. Garzon , R. Gernhäuser , C. Gilardi , M. Golubeva , D. Gonza'lez-Di'az , F. Guber , M. Gumberidze , T. Heinz , T. Hennino , R. Holzmann , A. Ierusalimov , I. Iori , A. Ivashkin , M. Jurkovic , B. Kämpfer , K. Kanaki , T. Karavicheva , I. Koenig , W. Koenig , B. W. Kolb , R. Kotte , A. Kr'asa , F. Krizek , R. Krücken , H. Kuc , W. Kuehn , A. Kugler , A. Kurepin , R. Lalik , S. Lang , J. S. Lange , K. Lapidus , T. Liu , L. Lopes , M. Lorenz , L. Maier , A. Mangiarotti , J. Markert , V. Metag , B. Michalska , J. Michel , E. Morinie're , J. Mousa , C. Müntz , L. Naumann , J. Otwinowski , Y. C. Pachmayer , M. Palka , Y. Parpottas , V. Pechenov , O. Pechenova , J. Pietraszko , W. Przygoda , B. Ramstein , A. Reshetin , A. Rustamov , A. Sadovsky , P. Salabura , A. Schmah , E. Schwab , J. Siebenson , Yu. G. Sobolev , S. Spataro , B. Spruck , H. Ströbele , J. Stroth , C. Sturm , A. Tarantola , K. Teilab , P. Tlusty , M. Traxler , R. Trebacz , H. Tsertos , V. Wagner , M. Weber , C. Wendisch , J. Wüstenfeld , S. Yurevich , Y. Zanevsky

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

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

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

Study of the process $e^+e^-\to \pi^+\pi^-\pi^0$ using initial state radiation with BABAR

The process $e^+e^-\to \pi^+\pi^-\pi^0\gamma$ is studied at a center-of-mass energy near the $\Upsilon(4S)$ resonance using a data sample of 469 fb$^{-1}$ collected with the BABAR detector at the PEP-II collider. We have performed a precise…

High Energy Physics - Experiment · Physics 2021-11-15 The BABAR Collaboration

Complete QED NLO contributions to the reaction $e^+e^- \to \mu^+\mu^-\gamma$ and their implementation in the event generator PHOKHARA

KLOE and Babar have an observed discrepancy of 2% to 5% in the invariant pion pair production cross section. These measurements are based on approximate NLO $ \mu^+ \mu^- \gamma $ cross section predictions of the Monte Carlo event generator…

High Energy Physics - Phenomenology · Physics 2015-06-18 F. Campanario , H. Czyż , J. Gluza , M. Gunia , T. Riemann , G. Rodrigo , V. Yundin

The event generator for the two-photon process e^+e^- --> e^+e^- R (J^{PC}=0^{-+}) in the single-tag mode

The Monte Carlo event generator GGRESRC is described. The generator is developed for simulation of events of the two-photon process e^+e^- --> e^+e^- R, where R is a pseudoscalar resonance, \pi^0, \eta, \eta', \eta_c, or \eta_b. The program…

High Energy Physics - Phenomenology · Physics 2010-10-29 V. P. Druzhinin , L. A. Kardapoltsev , V. A. Tayursky

Study of the process $e^+e^- \to \pi^+\pi^-\pi^0$ in the energy region $\sqrt[]{s}$ from 0.98 to 1.38 GeV.}

The cross section of the process $e^+e^-\to \pi^+\pi^-\pi^0$ was measured in the Spherical Neutral Detector experiment at the VEPP-2M collider in the energy region $\sqrt[]{s} = 980 \div 1380$ MeV. The measured cross section, together with…

High Energy Physics - Experiment · Physics 2008-11-26 M. N. Achasov , V. M. Aulchenko , K. I. Beloborodov , A. V. Berdyugin , A. G. Bogdanchikov , A. V. Bozhenok , A. D. Bukin , D. A. Bukin , S. V. Burdin , T. V. Dimova , V. P. Druzhinin , V. B. Golubev , V. N. Ivanchenko , A. A. Korol , S. V. Koshuba , I. N. Nesterenko , E. V. Pakhtusova , A. A. Polunin , A. A. Salnikov , S. I. Serednyakov , V. V. Shary , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , A. N. Skrinsky , A. G. Skripkin , Yu. V. Usov , A. V. Vasiljev

Near threshold radiative 3$\pi$ production in $e^+e^-$ annihilation

We consider the $\pi^+\pi^-\pi_0\gamma$ final state in electron-positron annihilation at cms energies not far from the threshold. Both initial and final state radiations of the hard photon is considered but without interference between…

High Energy Physics - Phenomenology · Physics 2009-11-07 A. Ahmedov , G. V. Fedotovich , E. A. Kuraev , Z. K. Silagadze

Final-sate radiation in electron-positron annihilation into a pion pair

The process of $e^+e^-$ annihilation into a $\pi^+\pi^-$ pair with radiation of a photon is considered. The amplitude of the reaction $e^+e^-\to\pi^+\pi^-\gamma$ consists of the model independent initial-state radiation (ISR) and…

High Energy Physics - Phenomenology · Physics 2008-11-26 S. Dubinsky , A. Korchin , N. Merenkov , G. Pancheri , O. Shekhovtsova

The pp -> pp pi pi pi reaction channels in the threshold region

The cross section for prompt neutral and charged three pion production in pp interactions was measured at excess energies in the range 160 - 217 MeV. That comprises the first measurement of the pp->pp pi0pi0pi0 reaction and the comparison…

Nuclear Experiment · Physics 2012-08-27 WASA Collaboration , C. Pauly , M. Jacewicz , I. Koch , M. Bashkanov , D. Bogoslawsky , H. Calén , F. Capellaro , H. Clement , L. Demirörs , C. Ekström , K. Fransson , L. Gustafsson , B. Höistad , G. Ivanov , E. Jiganov , T. Johansson , S. Keleta , S. Kullander , A. Kupść , A. Kuznetsov , P. Marciniewski , R. Meier , B. Morosov , W. Oelert , H. Pettersson , Y. Petukhov , A. Povtorejko , R. J. M. Y. Ruber , W. Scobel , K. Schönning , T. Skorodko , B. Shwartz , V. Sopov , J. Stepaniak , V. Tchernyshev , P. Thörngren Engblom , V. Tikhomirov , A. Turowiecki , G. J. Wagner , U. Wiedner , M. Wolke , A. Yamamoto , J. Zabierowski , J. Złomańczuk

Measurement of the gamma gamma* --> eta_c transition form factor

We study the reaction e+e- --> e+e- eta_c, eta_c --> K_S K+- pi-+ and obtain eta_c mass and width values 2982.2+-0.4+-1.6 MeV/c^2 and 31.7+-1.2+-0.8 MeV, respectively. We find Gamma(eta_c --> gamma gamma)B(eta_c --> K anti-K…

High Energy Physics - Experiment · Physics 2010-05-27 The BABAR Collaboration , J. P. Lees

Reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- at energies \sqrt{s}\leq 1 GeV

The cross section of reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- is calculated for energies 0.65\leq \sqrt{s}\leq1 GeV in the framework of the generalized hidden local symmetry model. The calculations are compared with the data of CMD-2 and…

High Energy Physics - Phenomenology · Physics 2009-02-19 N. N. Achasov , A. A. Kozhevnikov

The $e^+ e^-\to 2(\pi^+\pi^-)\pi^0$, 2(\pi^+\pi^-)\eta$, $K^+ K^-\pi^+\pi^-\pi^0$ and $K^+ K^-\pi^+\pi^-\eta$ Cross Sections Measured with Initial-State Radiation

We study the processes $e^+ e^-\to 2(\pi^+\pi^-)\pi^0\gamma$, $2(\pi^+\pi^-)\eta\gamma$, $K^+ K^-\pi^+\pi^-\pi^0\gamma$ and $K^+ K^-\pi^+\pi^-\eta\gamma$ with the hard photon radiated from the initial state. About 20000, 4300, 5500 and 375…

High Energy Physics - Experiment · Physics 2014-11-18 The BABAR Collaboration , B. Aubert

Contribution of the direct decay $\phi\to\pi^+ \pi^- \gamma$ to the process $e^+ e^- \to \pi^+ \pi^- \gamma$ at DA$\Phi$NE

The potential of DAPHNE to explore direct radiative decay $\phi \to \pi^+ \pi^- \gamma$ is studied in detail. Predictions of different theoretical models for this decay are compared. We find that it should be possible to discriminate…

High Energy Physics - Phenomenology · Physics 2009-10-31 K. Melnikov , F. Nguyen , B. Valeriani , G. Venanzoni

Final-state radiation in electron-positron annihilation into pion pair

The process of $e^+ e^-$ annihilation into $\pi^+ \pi^-$ pair with radiation of the photon is considered. The amplitude of the reaction $e^+ e^- \to \pi^+ \pi^- \gamma$ consists of the model independent initial-state radiation (ISR) and…

High Energy Physics - Phenomenology · Physics 2016-09-06 S. Dubinsky , A. Korchin , N. Merenkov , G. Pancheri , O. Shekhovtsova

Study of the process $e^+e^- \to \pi^+\pi^-\pi^0$ in the energy region $\sqrt[]{s}$ below 0.98 GeV

The cross section of the process $e^+e^-\to \pi^+\pi^-\pi^0$ was measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2M collider in the energy region $\sqrt[]{s}$ below 980 MeV. This measurement was based on about $1.2…

High Energy Physics - Experiment · Physics 2008-11-26 M. N. Achasov , K. I. Beloborodov , A. V. Berdyugin , A. G. Bogdanchikov , A. V. Bozhenok , A. D. Bukin , D. A. Bukin , T. V. Dimova , V. P. Druzhinin , V. B. Golubev , I. A. Koop , A. A. Korol , S. V. Koshuba , A. P. Lysenko , E. V. Pakhtusova , S. I. Serednyakov , V. V. Shary , Yu. M. Shatunov , Z. K. Silagadze , A. N. Skrinsky , A. A. Valishev , A. V. Vasiljev

Measurement of $\sigma(e^+e^-\to \pi^+ \pi^- \gamma)$ and extraction of $\sigma(e^+e^-\to \pi^+\pi^-)$ below 1 {\rm GeV} with the KLOE detector

We have measured the cross section $\sigma(e^+e^-\to \pi^+\pi^- \gamma)$ at an energy $W=m_\phi=1.02$ GeV with the KLOE detector at the electron-positron collider DA$\Phi$NE. From the dependence of the cross section on the invariant mass of…

High Energy Physics - Experiment · Physics 2008-11-26 The KLOE Collaboration , A. Aloisio

Study of the reactions $e^+e^-\to\pi^+\pi^-\pi^0\pi^0\pi^0\gamma$ and $\pi^+\pi^-\pi^0\pi^0\eta\gamma$ at center-of-mass energies from threshold to 4.35 GeV using initial-state radiation

We study the processes $e^+e^-\to\pi^+\pi^-\pi^0\pi^0\pi^0\gamma$ and $\pi^+\pi^-\pi^0\pi^0\eta\gamma$ in which an energetic photon is radiated from the initial state. The data were collected with the BaBar~ detector at SLAC. About 14\,000…

High Energy Physics - Experiment · Physics 2019-01-02 J. P. Lees

Study of the Process $e^+e^-\to \pi^+\pi^-\pi^+\pi^-$ IN THE C.M. Energy Range 920--1060 MeV with the CMD-3 Detector

A cross section of the process $e^+e^- \to \pipi\pipi$ has been measured using 6798$\pm$93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb$^{-1}$ collected with the CMD-3 detector in the center-of-mass…

High Energy Physics - Experiment · Physics 2017-03-22 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 , Yu. V. Yudin

Joint description of the e+e- annihilation into both four-pion channels

The e+e- --> pi+pi-pi0pi0 reaction cross section as a function of the incident energy is calculated using a model that is an extension of our recently published model of the e+e- annihilation into four charged pions. The latter considered…

High Energy Physics - Phenomenology · Physics 2008-11-26 Josef Juran , Peter Lichard