arXiv subjects

A. V. Kulik

Publications and source records attributed to A. V. Kulik.

6 recordsLinked to original sources

arXiv2026

A search for the dark photon in the OKA experiment

A search for the massless dark photon in the decay $K^{+}\to π^{+}π^{0}\overline{{} γ}$ is performed with the OKA detector exposed to 17.7 GeV/c RF separated secondary beam of the U70 Proton Synchrotron. A high-statistics data sample of the $K^{+}$ decays is used for a missing mass search of the stable massless invisible dark photon ($\overlineγ$) in the final state. In the absence of a statistically valuable signal the upper limit on the branching ratio of the decay $Br<2.0\times10^{-6}$ is obtained with a 90% confidence level based on a realistic matrix element of the process. Currently, it is the best upper limit for this hypothetical decay channel.

hep-ex↗

arXiv2024

The upper limit on the $K^+ \to π^0π^0π^0e^+ν$ decay

A search for the $K^{+} \to π^{0}π^{0}π^{0}e^+ν$ decay is performed by the OKA collaboration. The search is based on $3.65 \times 10^9 ~ K^+$ decays. No signal is observed. The upper limit set is $BR(K^{+} \to π^{0}π^{0}π^{0}e^+ν) < 5.4\times 10^{-8} ~ 90\%$ CL, 65 times lower than the one currently listed by PDG.

hep-ex↗

arXiv2024

Searches for the light invisible axion-like particle in $K^{+}\toπ^{+}π^{0}a$ decay

A high statistics data sample of the $K^{+}$ decays is recorded by the OKA collaboration. A missing mass analysis is performed to search for a light invisible pseudoscalar axion-like particle (ALP) $a$ in the decay $K^{+} \to π^{+} π^{0} a$. No signal is observed, the upper limits for the branching ratio of the decay are calculated. The $90\%$ confidence level upper limit is changing from $2.5\cdot10^{-6}$ to $2\cdot10^{-7}$ for the ALP mass from 0 to 200 MeV/$c^{2}$, except for the region of $π^{0}$ mass, where the upper limit is $4.4\cdot10^{-6}$.

hep-ex↗

arXiv2023

Observation of $K^{+} \to π^{+}π^{0}π^{0}γ$ decay

The $K^{+} \to π^{+}π^{0}π^{0}γ$ decay is observed by the OKA collaboration. The branching ratio is measured to be $(4.1 \pm 0.9(stat) \pm 0.4(syst))\times 10^{-6}$. The branching ratio and $γ$ energy spectrum are consistent with ChPT prediction.

hep-ex↗

arXiv2022

Measurement of T-odd asymmetry in radiative K+ -> pi0 e+ nu gamma decay using OKA detector

The paper presents a measurement of the T-odd correlation in radiation decay \boldmath $K^+ \rightarrow π^{0} e^{+} ν_{e} γ$ performed on the installation of the 101200 candidate events of the investigated decay were identified. Measured correlation $ξ_{πe γ}$ -is a mixed product of moments $e^{+}$, $π^{0}$, $γ$ in the kaon rest system, normalized by $M^{3}_{K}$. To assess the asymmetry of the distribution by $ξ_{πe γ}$ the value used is $A_ξ= \frac {N_{+}-N_{-}} {N_{+}+N_{-}}$, where $N_{+(-)}$ is the number of events with $ξ$ greater than (less than) zero. For the $A_ξ$ asymmetry, the value is obtained $A_ξ = (+0.1 \pm 3.9($stat.$) \pm1.7($syst.$))\times10^{-3}$ or $|A_ξ| < 5.4\times10^{-3} (90\%~ CL)$

hep-ex↗

arXiv2006

Industrial Strength Software in Computer Based Engineering Education (CBEE): a Case Study

Challenging problems of modern engineering education and a role of information technology are reviewed. An importance of simulation of real world physical problems in both graduate and lifelong/corporate education is discussed. It is proposed to integrate the hypermedia theory courseware with industrial strength simulation software. As a proof of the concept an educational environment "Heat and Mass Transfer in Advanced Semiconductor Technology" has been developed.

physics.ed-ph↗