The cross section of the process e + e − → π + π − has been measured in the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The ...measurement is based on a full dataset collected below 1 GeV during three data taking seasons, corresponding to an integrated luminosity of about 62 pb − 1 . In the dominant ρ -resonance region, a systematic uncertainty of 0.7% has been reached. At energies around ϕ -resonance the π + π − production cross section was measured for the first time with high beam energy resolution. The forward-backward charge asymmetry in the π + π − production has also been measured. It shows a strong deviation from the theoretical prediction based on the conventional scalar quantum electrodynamics framework, and it is in good agreement with the generalized vector-meson-dominance and dispersive-based predictions. The impact of the presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed. Published by the American Physical Society 2024
The original measuring system and method of temperature fields measuring of integrated circuits chips for controlling of thermal resistance between a chip and its case under production conditions is ...presented. The infrared system allows temperature measuring over the range (40-150)°C, and also allows to spot small gains of IC chips temperature around 1°C. The developed system based on infrared microbolometric matrix and allows controlling of integrated circuits chips temperature fields with the high spatial resolution up to 15 microns.
Cognitive impairment in childhood-onset epilepsy Paramonova, A. I.; Lysova, K. D.; Timechko, E. E. ...
Èpilepsiâ i paroksizmalʹnye sostoâniâ (Online),
04/2024, Letnik:
16, Številka:
1
Journal Article
Recenzirano
Odprti dostop
In pediatric practice, epilepsy holds one of the leading places among neurological pathologies. Along with seizures, a child's intellectual impairment lowering quality of life plays a crucial role in ...social disintegration. Cognitive impairments occuring in idiopathic generalized epilepsies (IGE) and self-limited epilepsy with centrotemporal spikes (SeLECTS) considered benign have been widely investigated. However, available data suggest that such disorders result in multiple persistent alterations in the cognitive sphere. In this case, features of the epilepsy etiopathogenesis account for disease early onset and profoundly remodeled structures involved in the implementation of cognitive functions. Current review is aimed to summarizing data regarding developmental mechanisms and range of cognitive impairment in IGE and SeLECTS.
The cross section of the process e+e−→ωη is measured in the center-of-mass energy range 1.34–2.00 GeV. The analysis is based on data collected with the SND detector at the VEPP-2000 e+e− collider. ...The measured e+e−→ωη cross section is the most accurate to date. A significant discrepancy is observed between our data and previous BABAR measurements.
A capillary electrophoresis technique for quantitative determination of phenibut in microcapsules was developed and validated. Rather high efficiencies (~200,000 theoretical plates) and the required ...resolution (
R
s
≥ 1.5) were attained using sodium tetraborate decahydrate solution (10 mM) at pH 9.2 as the supporting electrolyte. Validation of the technique showed that it was specific and complied with requirements of the SP XIIIth Ed. with respect to analytical range and linearity.
Recent results from the CMD-3 detector Lukin, P.A.; Akhmetshin, R.R.; Amirkhanov, A.N. ...
Nuclear and particle physics proceedings,
January-March 2020, 2020-01-00, Letnik:
309-311
Journal Article
Recenzirano
This paper reports a current status of the measurements of the hadronic cross sections in the c.m. energy range from 0.32 to 2.0 GeV with the CMD-3 detector at the VEPP-2000 electron-positron ...collider. The overall size of the data, acquired by the CMD-3 in the runs of 2010–2013 and 2017–2018 years, is about 160 pb−1. The results of data analysis for various exclusive modes of e+e−→hadrons are described.
Status and perspectives of the VEPP-2000 Shatunov, P. Yu; Berkaev, D. E.; Zharinov, Yu. M. ...
Physics of particles and nuclei letters,
12/2016, Letnik:
13, Številka:
7
Journal Article
Recenzirano
The electron-positron collider VEPP-2000 operates at BINP from 2010 year. The application of round colliding beams concept along with the accurate orbit and lattice correction yielded the high peak ...luminosity of 1.2 × 10
31
cm
−2
s
−1
at 500MeV. The peak luminosity limited only by beam-beam effects, while average luminosity–by present lack of positrons in whole energy range of 160–1000 MeV. To perform high luminosity at high energies the top-up injection is needed. At present new electron and positron injection complex at BINP is commissioned and ready to feed VEPP-2000 collider with intensive beams with energy of 450MeV.
Abstract The process $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb $$^{-1}$$ - ...1 collected by the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. The $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\phi \eta $$ ϕ η intermediate state. Our result on the $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is consistent with the $$e^+e^-\rightarrow \phi \eta $$ e + e - → ϕ η measurement in the $$\phi \rightarrow K^+ K^-$$ ϕ → K + K - mode. The search for radiative processes contributing to the $$e^+e^-\rightarrow \eta \eta \gamma $$ e + e - → η η γ cross section is performed, and no significant signal is observed.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Abstract
The process
$$e^+e^-\rightarrow \eta \eta \gamma $$
e
+
e
-
→
η
η
γ
is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb
$$^{-1}$$
-
...1
collected by the SND detector at the VEPP-2000
$$e^+e^-$$
e
+
e
-
collider. The
$$e^+e^-\rightarrow \eta \eta \gamma $$
e
+
e
-
→
η
η
γ
cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the
$$\phi \eta $$
ϕ
η
intermediate state. Our result on the
$$e^+e^-\rightarrow \eta \eta \gamma $$
e
+
e
-
→
η
η
γ
cross section is consistent with the
$$e^+e^-\rightarrow \phi \eta $$
e
+
e
-
→
ϕ
η
measurement in the
$$\phi \rightarrow K^+ K^-$$
ϕ
→
K
+
K
-
mode. The search for radiative processes contributing to the
$$e^+e^-\rightarrow \eta \eta \gamma $$
e
+
e
-
→
η
η
γ
cross section is performed, and no significant signal is observed.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
VEPP-2000 is the only electron–positron collider with round beams. This factor enables one to increase the beam–beam effect limit. During the 2018–2019 season, the experimental program was focused on ...the energy range of 550–990 MeV per beam. Data accumulation was performed using CMD-3 and SND detectors. The measured luminosity integral proved to have a record value of 68 pb
–1
per detector. After connecting to the BINP injection complex in 2016, the luminosity of VEPP-2000 is limited by the beam–beam effects in the entire energy range.
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