experimental particle physics

Study of the proccess $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0} I ¨ ^{0} I^\cdot$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector

arXiv:2607.11556

summary

The paper reports a measurement of the e⁺e⁻ → π⁺π⁻π⁰π⁰η cross section between 1.6 and 2.0 GeV using the CMD-3 detector, finding about 6300 signal events and a systematic uncertainty of ~10%, with the production dominated by ω(782)π⁰η and indications of a₀(980) and ρ(770) contributions.

Abstract

The cross section of the process $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0} I ¨ ^{0} I^\cdot$ has been measured using a data sample with the integrated luminosity of 372 pb $^{- 1}$ collected with the CMD-3 detector at the VEPP-2000 $e^{+} e^{-}$ collider. 6300 $\pm$ 145 signal events have been selected in the center-of-mass energy range 1.6--2.0 GeV. The total systematic uncertainty of the cross section is about 10\%. The production dynamics is dominated by the $I ¨ (782) I ¨ ^{0} I^\cdot$ final state with a possible small contribution of the $a_{0} (980)$ resonance in the $I ¨ ^{0} I^\cdot$ combination. We also observe a presence of the $I ¨ (770)^{\pm}$ resonance signal in the $I ¨ ^{\pm} I ¨ ^{0}$ invariant mass distribution.

14 pages, 10 figures

Topics & keywords

#e+e- annihilation #cross-section measurement #hadron spectroscopy #vector meson production #CMD-3 detectore+e- → π+π-π0π0ηCMD-3VEPP-2000ω(782)a0(980)ρ(770)systematic uncertainty

Study of the proccess e+e−→I¨+I¨−I¨0I¨0I^⋅ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector

Abstract

Topics & keywords

Study of the proccess $e^{+} e^{-} \to I ¨ ^{+} I ¨ ^{-} I ¨ ^{0} I ¨ ^{0} I^\cdot$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector