V. Obraztsov
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View article: Does the Existence of the f0 Meson Increase the K+ → π0π0π0e+ν Decay Probability?
Does the Existence of the f0 Meson Increase the K+ → π0π0π0e+ν Decay Probability? Open
We estimate a possible contribution of the two-pion system $${{f}_{0}}(500)$$ wide resonance to the decay probability of the super rare decay $${{K}^{ + }} \to 3{{\pi }^{0}}{{e}^{ + }}\nu $$ . We vary the width of the resonance from 0.01 t…
View article: Does the existence of $f_0$ meson enlarge the $K^+ \to π^0π^0π^0 e^+ ν$ decay probability?
Does the existence of $f_0$ meson enlarge the $K^+ \to π^0π^0π^0 e^+ ν$ decay probability? Open
We estimate a possible contribution of the two-pion system $f_0(500)$ wide resonance to the decay probability of the super rare decay $K^+ \to 3π^0 e^+ ν$. We vary the width of the resonance from 0.01 MeV to 1000 MeV. We found that the con…
View article: On the $K^+ \to π^0π^0π^0 e^+ ν$ decay
On the $K^+ \to π^0π^0π^0 e^+ ν$ decay Open
The OKA Collaboration has obtained a new upper limit on the $K^+ \to π^0π^0π^0 e^+ ν$ decay probability which is 65 times lower than the one currently listed by PDG. However it is still about $10^{4}$ times worse than the theoretical predi…
View article: The upper limit on the $K^+ \to π^0π^0π^0e^+ν$ decay
The upper limit on the $K^+ \to π^0π^0π^0e^+ν$ decay Open
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\ti…
View article: Searches for the light invisible axion-like particle in $$K^{+} \rightarrow \pi ^{+}\pi ^{0} a$$ decay
Searches for the light invisible axion-like particle in $$K^{+} \rightarrow \pi ^{+}\pi ^{0} a$$ decay Open
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^{+} \rightarrow …
View article: Observation of $K^{+} \to π^{+}π^{0}π^{0}γ$ decay
Observation of $K^{+} \to π^{+}π^{0}π^{0}γ$ decay Open
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 pred…
View article: Searches for the light invisible axion-like particle in $K^{+}\toπ^{+}π^{0}a$ decay
Searches for the light invisible axion-like particle in $K^{+}\toπ^{+}π^{0}a$ decay Open
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…
View article: Evidence for WZW anomaly in the coherent reaction K <sup>+</sup> Cu → K <sup>+</sup> π <sup>0</sup> Cu
Evidence for WZW anomaly in the coherent reaction K <sup>+</sup> Cu → K <sup>+</sup> π <sup>0</sup> Cu Open
On the statistics of ∼ 8·10 9 positively charged kaons passing through a thin copper target a coherent production of the K + π 0 - pair is studied. Contributions of Coulomb, strong interactions and their interference to the total cross sec…
View article: Measurement of T-odd asymmetry in radiative K+ -> pi0 e+ nu gamma decay using OKA detector
Measurement of T-odd asymmetry in radiative K+ -> pi0 e+ nu gamma decay using OKA detector Open
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 c…
View article: Prof. S. Chiriev. —Clinical notes from the nervous department of the Kiev military hospital. II. To the treatment of morbus Basedowii
Prof. S. Chiriev. —Clinical notes from the nervous department of the Kiev military hospital. II. To the treatment of morbus Basedowii Open
Having briefly touched on the main symptoms of Graves' disease and rejecting the current theory about the role of the thyroid gland in neutralizing the decay products of proteinaceous substances in the body, the author recommends the follo…
View article: Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC Open
The calibration and performance of the LHCb Calorimeter system in Run 1 and 2 at the LHC are described. After a brief description of the sub-detectors and of their role in the trigger, the calibration methods used for each part of the syst…
View article: New veto hodoscope ANTI-0 for the NA62 experiment at CERN
New veto hodoscope ANTI-0 for the NA62 experiment at CERN Open
The NA62 experiment is a fixed-target experiment at CERN SPS. The main goal\nof the experiment is to measure the branching ratio of the ultra-rare kaon\ndecay $K^{+}\\to\\pi^{+}\\nu\\bar\\nu$. The NA62 detector allows also to study other\n…
View article: Recent results from OKA setup at U-70 synchrotron
Recent results from OKA setup at U-70 synchrotron Open
Several radiative decays are under study by OKA setup at U-70 synchrotron. First, the radiative decay K + → µ + νγ ( K µ 2 γ ) is studied on statistics of about 95K events for 25 MeV < < 150 MeV. A clear destructive interference bet…
View article: Measurement of the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ decay form factors in the OKA experiment
Measurement of the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ decay form factors in the OKA experiment Open
A precise measurement of the vector and axial-vector form factors difference\n$F_V-F_A$ in the $K^+\\rightarrow{\\mu^+}{\\nu_{\\mu}}{\\gamma}$ decay is presented.\nAbout 95K events of $K^+\\rightarrow{\\mu^+}{\\nu_{\\mu}}{\\gamma}$ are sel…
View article: Measurement of the $K^+\rightarrow{μ^+}{ν_μ}γ$ decay form factors in the OKA experiment
Measurement of the $K^+\rightarrow{μ^+}{ν_μ}γ$ decay form factors in the OKA experiment Open
A precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in the $K^+\rightarrow{μ^+}{ν_μ}γ$ decay is presented. About 95K events of $K^+\rightarrow{μ^+}{ν_μ}γ$ are selected in the OKA experiment. The result is…
View article: KLEVER: An experiment to measure BR($K_L\toπ^0ν\barν$) at the CERN SPS
KLEVER: An experiment to measure BR($K_L\toπ^0ν\barν$) at the CERN SPS Open
Precise measurements of the branching ratios for the flavor-changing neutral current decays $K\toπν\barν$ can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay mod…
View article: Results on kaon physics from OKA setup at U-70
Results on kaon physics from OKA setup at U-70 Open
Some recent results from OKA setup are presented. First, the decay K+ →π0 e+υ(Ke3) is studied. About 3.15M events are selected for the analysis. The linear and quadratic slopes for the decay formfactor f+(t) are measured: . For the exotic …
View article: High statistics measurement of the K+→π0e+ν(Ke3) decay formfactors
High statistics measurement of the K+→π0e+ν(Ke3) decay formfactors Open
The decay K+→π0e+ν(Ke3) is studied using in-flight decays detected with 'OKA' spectrometer. About 6M events are collected for the analysis. The λ+ slope parameter of the decay formfactor f+(t) in the linear approximation (average slope) is…