Alexander Bondar

Measurement of e+e- → π+π- cross-section with CMD-2 around ρ-meson

The cross section of the process e+e- ->pi+pi- has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e- collider in the center-of-mass energy range from 0.61 to 0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed.

Cross section of the reaction e+e- → π+π-π+π- below 1 GeV at CMD-2

Abstract 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 e + e − → π + π − π + π − have been selected. The energy dependence of the cross section agrees with the assumption of the a 1 (1260) π intermediate state which is dominant above 1 GeV. For the first time π + π − π + π − events are observed at the ρ meson energy. Under the assumption that all these events come from the ρ meson decay, the value of the cross section at the ρ meson peak corresponds to the following decay width: Γ(ρ 0 →π + π − π + π − )=(2.8±1.4±0.5) keV or to the branching ratio B(ρ 0 →π + π − π + π − )=(1.8±0.9±0.3)·10 −5 .Using 3.07

Detection of reactor antineutrino coherent scattering off nuclei with a two-phase noble gas detector

{pb}^{-1}

Study of the process e+e−→ηγ in c.m. energy range 600–1380 MeV at CMD-2

of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process

Observation of the conversion decay φ→ π0e+e- at CMD-2

\epm \to \pch

Total and differential cross sections of η-production in proton–deuteron fusion for excess energies between Qη = 13 MeV and Qη = 81 MeV

have been selected. The energy dependence of the cross section agrees with the assumption of the

WASA-at-COSY Collaboration

a_1(1260) \pi

Study of the process e+e- → ωπ0 → π0π0γ in c.m. energy range 920-1380 MeV at CMD-2

intermediate state which is dominant above 1 GeV. For the first time \fourpi events are observed at the

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

\rho

Heavy quark spin structure in Z_b resonances

meson energy. Under the assumption that all these events come from the