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Register a new userStudy of the process $e^+e^- to K^+K^-$ in the center-of-mass energy range 1010--1060~MeV with the CMD-3 detector
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The process $e^+e^- to K^+K^-$ has been studied using $1.7 times 10^6$ 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 measured with an about 2% systematic uncertainty and it is used to calculate the contribution to the anomalous magnetic moment of the muon $a_{mu}^{K^+K^-} = (19.33 pm 0.40) times 10^{-10}$, and to obtain the $phi(1020)$ meson parameters. We consider the relationship between the $e^+e^- to K^+K^-$ and $e^+e^- to K^0_SK^0_L$ cross sections and compare it to the theoretical expectations.
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A cross section of the process $e^+e^- to pipipipi$ 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 energy range 920--1060 MeV. The measured cross section exhibits an interference pattern of the $phi(1020)topipipipi$ decay with a non-resonant process $e^+e^- to pipipipi$, from which we obtain the branching fraction of the doubly suppressed decays (by G-parity and OZI rule): $BR(phitopipipipi) = (6.5pm2.7pm1.6)times 10^{-6}$.
The process $e^+e^-{to}K^+K^-eta$ 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 $K^+K^-eta$ final state is found to be dominated by the contribution of the $phi(1020)eta$ intermediate state. The cross section of the process $e^+e^-{to}phi(1020)eta$ has been measured with a systematic uncertainty of 5.1$%$ on the base of 3009 $pm$ 67 selected events. The obtained cross section has been used to calculate the contribution to the anomalous magnetic moment of the muon: $a_{mu}^{phieta}(E<1.8, {rm GeV})=(0.321 pm 0.015_{rm stat} pm 0.016_{rm syst}) times 10^{-10}$, $a_{mu}^{phieta}(E<2.0, {rm GeV})=(0.440 pm 0.015_{rm stat} pm 0.022_{rm syst}) times 10^{-10}$. From the cross section approximation the $phi(1680)$ meson parameters have been determined with better statistical precision, than in previous studies.
The process $e^+e^- to K^0_L K^0_S$ has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only.
The cross section of the process $e^+e^- to 3(pi^+pi^-)$ has been measured using 22 pb$^{-1}$ of integrated luminosity collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider in the c.m. energy range 1.5 -- 2.0 GeV. The measured cross section exhibits a sharp drop near the $pbar p$ threshold. A first study of dynamics of six-pion production has been performed.
Using a data sample of 6.8 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider we select about 2700 events of the $e^+e^- to pbar{p}$ process and measure its cross section at 12 energy ponts with about 6% systematic uncertainty. From the angular distribution of produced nucleons we obtain the ratio $|G_{E}/G_{M}| = 1.49 pm 0.23 pm 0.30$.
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