arXiv subjects

S. P. Sherstyuk

Publications and source records attributed to S. P. Sherstyuk.

3 recordsLinked to original sources

arXiv2024

Measurement of the $e^+e^-\to K_SK_L$ cross section near the $ϕ(1020)$ resonance with the SND detector

The cross section for the $e^+e^-\to K_SK_L$ process is measured in the center-of-mass energy range from 1000 MeV to 1100 MeV in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measurement is carried out in the $K_S\to 2π^0$ decay mode. Data with an integrated luminosity of 20 pb$^{-1}$ recorded in 2018 at 18 energy points are used in the analysis. The systematic uncertainty in the measured cross section at the maximum of the $ϕ$ resonance is 0.9%. The mass, width of the $ϕ$ meson, and the product of the branching fractions $B(ϕ\to K_SK_L)B(ϕ\to e^+e^-)$ are determined from the fit to the cross-section energy dependence.

hep-ex↗

arXiv2024

Cross section of the process $e^+e^-\to n\bar{n}$ near the threshold

The $e^+e^-\to n\bar{n}$ cross section was measured at center of mass (c.m.) energies from the threshold to 1908 MeV. The experiment to measure the cross section has been carried out at the VEPP-2000 $e^+e^-$ collider in 13 energy points. The SND detector is used to detect the produced neutron-antineutrons ($n\bar{n}$) events. A special time measurement system on the calorimeter was used to select the time-delayed $n\bar{n}$ events. The measured $e^+e^-\to n\bar{n}$ cross section is 0.4--0.6 nb. The neutron effective timelike form factor in the energy range under study varies from 0.3 to 0.6.

hep-ex↗

arXiv2024

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

The results of the search for the $e^+e^-\toη^{\prime}γ$ 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 the $e^+e^-$ collider VEPP-2000 in 2010--2024. The $η^{\prime}\toηπ^0π^0$ decay is used in the analysis, with the subsequent $η$ and $π^0$ decays into $γγ$. Upper limits not exceeding 13 pb have been set on the $e^+e^-\toη^{\prime}γ$ cross section at the 90\% confidence level.

hep-ex↗