Related papers: The processes $e^{+}e^{-} \to \pi\pi(\pi')$ in the…

Evidence for Exotic J^{PC}=1^{-+} Meson Production in the Reaction pi- p --> eta pi- p at 18 GeV/c

Details of the analysis of the eta pi- system studied in the reaction pi^{-} p --> eta pi^{-} p at 18 GeV/c are given. Separate analyses for the 2 gamma and pi+ pi- pi0 decay modes of the eta are presented. An amplitude analysis of the data…

High Energy Physics - Experiment · Physics 2008-11-26 E852 Collaboration , S. U. Chung et al

S-wave $\pi - \pi$ Scattering Lengths in the SU(2) NJL Model Beyond Mean-field Approximation

The S-wave $\pi - \pi$ scattering lengths $a_0$ and $a_2$ are calculated to the lowest order of $1/N_c$ expansion in the general framework of SU(2) NJL model beyond mean-field approximation. It is shown that using the universal curve of…

High Energy Physics - Phenomenology · Physics 2009-10-31 Mei Huang , Pengfei Zhuang , Weiqin Chao

Measurement of the decay phi->mu+mu-

The process e^+e^- ->mu^+mu^- has been studied with SND detector at VEPP-2M e^+e^- collider in the vicinity of phi(1020) resonance. The product of branching ratios of phi meson into leptons \sqrt{B(phi->mu^+mu^-) B(phi->…

High Energy Physics - Experiment · Physics 2019-08-17 M. N. Achasov , S. E. Baru , 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 , P. I. Ivanov , A. A. Korol , S. V. Koshuba , E. A. Perevedentsev , E. E. Pyata , A. A. Salnikov , S. I. Serednyakov , V. V. Shary , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , Yu. V. Usov

Observation of the decay mode K_L -> pi^+ pi^- e^+ e^-

We report on results of an experimental search for the K_L -> pi^+ pi^- e^+ e^- decay mode. We found 13.5 +- 4.0 events and determined its branching ratio to be (4.4 +- 1.3(stat) +- 0.5(syst))*10^{-7}. The result agrees well with the…

High Energy Physics - Experiment · Physics 2008-11-26 Y. Takeuchi , Y. Hemmi , H. Kurashige , Y. Matono , K. Murakami , T. Nomura , H. Sakamoto , N. Sasao , M. Suehiro , Y. Fukushima , Y. Ikegami , T. T. Nakamura , T. Taniguchi , M. Asai

Cross section of the reaction $e^+ e^- \to \pi^+\pi^-\pi^+\pi^- $ below 1 GeV at CMD-2

Using 3.07 ${pb}^{-1}$ of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process $\epm \to \pch$ have been selected. The energy dependence of the cross section agrees with the assumption of the $a_1(1260)…

High Energy Physics - Experiment · Physics 2016-08-31 2 collaboration

Observation of a resonant structure in $e^{+}e^{-} \to K^{+}K^{-}\pi^{0}\pi^{0}$

Using $e^{+}e^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis…

High Energy Physics - Experiment · Physics 2020-03-25 M. Ablikim , M. N. Achasov , P. Adlarson , S. Ahmed , M. Albrecht , A. Amoroso , Q. An , Anita , Y. Bai , O. Bakina , R. Baldini Ferroli , I. Balossino , Y. Ban , K. Begzsuren , J. V. Bennett , N. Berger , M. Bertani , D. Bettoni , F. Bianchi , J. Biernat , J. Bloms , I. Boyko , R. A. Briere , H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , J. F. Chang , W. L. Chang , G. Chelkov , D. Y. Chen , G. Chen , H. S. Chen , M. L. Chen , S. J. Chen , X. R. Chen , Y. B. Chen , W. Cheng , G. Cibinetto , F. Cossio , X. F. Cui , H. ~L. ~Dai , J. P. Dai , X. C. Dai , A. Dbeyssi , D. Dedovich , Z. Y. Deng , A. Denig , I. Denysenko , M. Destefanis , F. De Mori , Y. Ding , C. Dong , J. Dong , L. Y. Dong , M. Y. Dong , S. X. Du , J. Fang , S. S. Fang , Y. Fang , R. Farinelli , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , M. Fritsch , C. D. Fu , Y. Fu , X. L. Gao , Y. Gao , Y. Gao , Y. G. Gao , I. Garzia , E. M. Gersabeck , A. Gilman , K. Goetzen , L. Gong , W. X. Gong , W. Gradl , M. Greco , L. M. Gu , M. H. Gu , S. Gu , Y. T. Gu , C. Y Guan , A. Q. Guo , L. B. Guo , R. P. Guo , Y. P. Guo , Y. P. Guo , A. Guskov , S. Han , T. T. Han , T. Z. Han , X. Q. Hao , F. A. Harris , K. L. He , F. H. Heinsius , T. Held , Y. K. Heng , M. Himmelreich , T. 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Measurement of sigma(e+ e- -> pi+ pi-) from threshold to 0.85 GeV^2 using Initial State Radiation with the KLOE detector

We have measured the cross section of the radiative process e+e- -> pi+pi-gamma with the KLOE detector at the Frascati phi-factory DAPHNE, from events taken at a CM energy W=1 GeV. Initial state radiation allows us to obtain the cross…

High Energy Physics - Experiment · Physics 2011-06-15 KLOE Collaboration , F. Ambrosino , F. Archilli , P. Beltrame , G. Bencivenni , C. Bini , C. Bloise , S. Bocchetta , F. Bossi , P. Branchini , G. Capon , T. Capussela , F. Ceradini , P. Ciambrone , E. De Lucia , A. De Santis , P. De Simone , G. De Zorzi , A. Denig , A. Di Domenico , C. Di Donato , B. Di Micco , M. Dreucci , G. Felici , S. Fiore , P. Franzini , C. Gatti , P. Gauzzi , S. Giovannella , E. Graziani , M. Jacewicz , W. Kluge , J. Lee-Franzini , D. Leone , P. Massarotti , S. Meola , S. Miscetti , S. Müller , F. Murtas , M. Napolitano , F. Nguyen , A. Passeri , V. Patera , P. Santangelo , C. Taccini , L. Tortora , G. Venanzoni , R. Versaci

Broad resonance structure in $e^+e^-\to f_1(1285)\pi^+\pi^-$ and higher $\rho$-meson excitations

Recently, the BaBar Collaboration reported a broad resonance structure near 2 GeV when analyzing the $e^+e^-\to f_1(1285)\pi^+\pi^-$ process, which provides a good opportunity to study the higher $\rho$-mesonic states. When considering the…

High Energy Physics - Phenomenology · Physics 2022-11-11 Xiang Liu , Qin-Song Zhou , Li-Ming Wang

Isoscalar resonances with J^{PC}=1^{--} in e^+e^-annihilation

The analysis of the vector isoscalar excitations in the energy range between 1 and 2 GeV of the $e^+e^-$ annihilation is presented for the final states $\pi^+\pi^-\pi^0$, $\omega\pi^+\pi^-$, $K^+K^-$, $K^0_SK^\pm\pi^\mp$ and…

High Energy Physics - Phenomenology · Physics 2008-11-26 N. N. Achasov , A. A. Kozhevnikov

Precise Measurement of the e+ e- --> pi+ pi- (gamma) Cross Section with the Initial-State Radiation Method at BABAR

A precise measurement of the cross section of the process $e^+e^-\to\pi^+\pi^-(\gamma)$ from threshold to an energy of 3GeV is obtained with the initial-state radiation (ISR) method using 232fb$^{-1}$ of data collected with the BaBar…

High Energy Physics - Experiment · Physics 2017-11-23 J. P. Lees et al.

The decay $\eta' \to \pi\rho$ in the chiral NJL model

The branching fraction of the decay $\eta' \to \pi\rho$ is calculated in the chiral quark NJL model. The decay exists due to the mass difference between $u$- and $d$-quarks leading to $\pi^{0}-\eta^{'}$ mixing. Two different approaches are…

High Energy Physics - Phenomenology · Physics 2022-11-29 M. K. Volkov , A. A. Pivovarov , K. Nurlan

Account for axial vector mesons in the $\eta\to\pi^+\pi^-\gamma$ and $\eta' \to\pi^+\pi^-\gamma$ decays

The rates and spectra of the anomalous $\eta\to\pi^+\pi^-\gamma$ and $\eta' \to\pi^+\pi^-\gamma$ decays are calculated. The approach is based on the effective meson Lagrangian obtained in the Nambu-Jona-Lasinio model with vector and…

High Energy Physics - Phenomenology · Physics 2021-08-24 A. A. Osipov , A. A. Pivovarov , M. K. Volkov , M. M. Khalifa

Deep exclusive charged $\pi$ electroproduction above the resonance region

A description of exclusive charged pion electroproduction $(e,e'\pi^{\pm})$ off nucleons at high energies is proposed. The model combines a Regge pole approach with residual effect of nucleon resonances. The exchanges of $\pi$(140), vector…

High Energy Physics - Phenomenology · Physics 2010-05-28 Murat M. Kaskulov , Ulrich Mosel

Dispersive analysis of the $\gamma\gamma^{*} \to \pi \pi$ process

We present a theoretical study of the $\gamma\gamma^{*} \to \pi^+\pi^-, \pi^0\pi^0$ processes from the threshold through the $f_2(1270)$ region in the $\pi\pi$ invariant mass. We adopt the Omn\`es representation in order to account for…

High Energy Physics - Phenomenology · Physics 2019-01-23 Igor Danilkin , Marc Vanderhaeghen

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

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

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

Process pi p -> pi pi N at high energies and moderate momenta transferred to the nucleon and the determination of parameters of the f_0(980) and f_0(1300)

We present the results of simultaneous analysis of the S-wave pi pi-spectra in the reactions pi^- p -> (pi^0 pi^0)_S n at p_{lab}=38 GeV/c (GAMS) and pi^- p -> (pi^+ pi^-)_S n at p_{lab}=18 GeV/c (E852 Collaboration) at moderate momenta…

High Energy Physics - Phenomenology · Physics 2008-11-26 V. V. Anisovich , A. V. Sarantsev

Measurement of the $e^+e^-\to\pi^+\pi^-\pi^0\pi^0$ cross section using initial-state radiation at BaBar

The process $e^+e^- \to \pi^+\pi^-2\pi^0\gamma$ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using $454.3 \rm{fb}^{-1}$ of data collected around a…

High Energy Physics - Experiment · Physics 2017-12-06 The BaBar Collaboration

Measurements of $e p \to e' \pi^+ \pi^- p'$ Cross Sections with CLAS at $1.40 < W < 2.0$ GeV and $2.0 < Q^2 < 5.0$ GeV$^2$

This paper reports new exclusive cross sections for $e p \to e' \pi^+ \pi^- p'$ using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0 GeV^2 < Q^2 < 5.0 GeV^2 in the…

Nuclear Experiment · Physics 2017-08-30 E. L. Isupov , V. D. Burkert , D. S. Carman , R. W. Gothe , K. Hicks , B. S. Ishkhanov , V. I. Mokeev , the CLAS Collaboration

News on PHOTOS Monte Carlo: gamma^* -> pi^+ pi^-(gamma) and K^\pm -> pi^+ pi^- e^\pm nu (gamma)

PHOTOS Monte Carlo is widely used for simulating QED effects in decay of intermediate particles and resonances. It can be easily connected to other main process generators. In this paper we consider decaying processes gamma^* -> pi^+…

High Energy Physics - Phenomenology · Physics 2011-01-05 Qing-Jun Xu , Z. was

Study of e+e- --> pi+ pi- pi0 process using initial state radiation with BABAR

The process e+e- --> pi+ pi- pi0 gamma has been studied at a center-of-mass energy near the Y(4S) resonance using a 89.3 fb-1 data sample collected with the BaBar detector at the PEP-II collider. From the measured 3pi mass spectrum we have…

High Energy Physics - Experiment · Physics 2008-11-26 The BABAR Collaboration , B. Aubert