Measurement of Γee(J/ψ) with KEDR detector Anashin, V. V; Aulchenko, V. M; Baldin, E. M ...
The journal of high energy physics,
05/2018, Volume:
2018, Issue:
5
Journal Article
Peer reviewed
Open access
A
bstract
The product of the electronic width of the
J/ψ
meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M
e
+
e
−
...collider. The obtained values are
Γ
e
e
J
/
ψ
=
5.550
±
0.056
±
0.089
keV
,
Γ
e
e
J
/
ψ
·
ℬ
hadrons
J
/
ψ
=
4.884
±
0.048
±
0.078
keV
,
Γ
e
e
J
/
ψ
·
ℬ
e
e
J
/
ψ
=
0.3331
±
0.0066
±
0.0040
keV
.
The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the
J/ψ
meson:
Γ
=
92.94
±
1.83
keV
.
These results are consistent with the previous experiments.
Particle identification system based on dense aerogel Barnyakov, A.Yu; Barnyakov, M.Yu; Beloborodov, K.I. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Volume:
732
Journal Article
Peer reviewed
A threshold Cherenkov counter based on dense aerogel with refraction index n=1.13 is described. This counter is used for kaon identification at momenta below 1GeV/c in the SND detector, which takes ...data at the VEPP-2000 e+e− collider. The results of measurements of the counter efficiency using electrons, muons, pions, and kaons produced in e+e− annihilation are presented.
The oil storage tanks foundations preparation technologies improvement is the relevant objective which achievement will make possible to reduce the material costs and spent time for the foundation ...preparing while providing the required operational reliability. The laboratory research revealed the nature of sandy soil layer watering with a given amount of water. The obtained data made possible developing the sandy soil layer moistening mathematical model. The performed estimation of the oil storage tank foundation soil moistening mathematical model accuracy showed the experimental and theoretical results acceptable convergence.
Objective
. To determine the relationship between violent acts and personality characteristics in alcohol dependent individuals.
Materials and methods
. The study was conducted in the penitentiary ...system. It involved 295 men with alcohol dependence syndrome (F10.2) aged from 21 to 60 years, with an average age of 40.7 ± 8.9 years and an average alcohol intake of 13.5 years. During the study, patients with alcohol dependence syndrome were divided into three groups. The following psychodiagnostic methods were used: the technique “Types of aggressiveness” developed by L. G. Pochebut (2012), the questionnaire “Style of self-regulation of behavior” (SSP-98), the test-questionnaire “Study of volitional self-regulation”, the questionnaire for the study of stages of psychotherapy “URICA” and others. Statistical analysis was carried out using the program SPSS 19.0. Spearman’s R-criterion and Mann-Whitney U-criterion were used.
Results
. The revealed high level of the final HCR-20 score in all three groups under study indicates a significant risk of committing violent acts, low adaptive capabilities and reduced stress tolerance of alcohol-dependent persons. The revealed average level of tolerance showed that personality traits, attitudes and beliefs of alcohol-dependent persons to a great extent determine their ambivalent attitude to the surrounding world with a combination of both tolerant and intolerant traits.The existing dual causal relationship between alcohol intake and stress manifestation shows that excessive stress increases the risk of alcohol-related problems, alcohol abuse in turn causes significant alcohol distress.
Conclusions
. The risk of violent acts in persons with alcohol dependence syndrome depends on the severity of such personality characteristics as aggressiveness and emotional excitability, low stress resistance, intolerance, and decreased ability to volitional self-regulation.
Emphysema causes a permanent destruction of alveolar walls leading to airspace enlargement, loss of elastic recoil, decrease in surface area for gas exchange, lung hyperexpansion, and increased work ...of breathing. The most accepted hypothesis of how emphysema develops is based on an imbalance of protease and antiprotease activity leading to the degradation of elastin within the fiber network of the extracellular matrix. Here we report novel roles for mechanical forces and collagen during the remodeling of lung tissue in a rat model of elastase-induced emphysema. We have developed a technique to measure the stress-strain properties of tissue sections while simultaneously visualizing the deformation of the immunofluorescently labeled elastin-collagen network. We found that in the elastase treated tissue significant remodeling leads to thickened elastin and collagen fibers and during stretching, the newly deposited elastin and collagen fibers undergo substantially larger distortions than in normal tissue. We also found that the threshold for mechanical failure of collagen, which provides mechanical stability to the normal lung, is reduced. Our results indicate that mechanical forces during breathing are capable of causing failure of the remodeled extracellular matrix at loci of stress concentrations and so contribute to the progression of emphysema.
Operation and performance of the ASHIPH counters at the KEDR detector Barnyakov, A.Yu; Barnyakov, M.Yu; Boborovnikov, V.S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2016, Volume:
824
Journal Article
Peer reviewed
In 2014 the fully installed ASHIPH (Aerogel, SHifter, PHotomultiplier) system began its operation in the KEDR experiment at the VEPP-4M e+e−-collider. The system contains 1000liters of aerogel with ...refractive index n=1.05 in 160 counters that are arranged in two layers. Cherenkov light collection is preformed by means of wavelength shifters (WLS). 160Micro-Channel Plate (MCP) PMTs with multialkali photocathode are used as photodetectors. Efficiency of relativistic particles detection was measured with e+e−→e+e− events and cosmic muons. Detection efficiency for under-threshold particles was measured with cosmic muons. From these data π/K-separation of 4σ at the momentum 1.2GeV/c was obtained.
Progress on development of the new FDIRC PID detector Va'vra, J.; Arnaud, N.; Barnyakov, A.Yu ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2013, Volume:
718
Journal Article
Peer reviewed
Open access
We present a progress status of a new concept of PID detector called FDIRC, intended to be used at the SuperB experiment, which requires π/K separation up to a few GeV/c. The new photon camera is ...made of the solid fused-silica optics with a volume 25× smaller and speed increased by a factor of 10 compared to the BaBar DIRC, and therefore will be much less sensitive to electromagnetic and neutron background.
We investigate electron transport through the interface between a niobium superconductor and the edge of a two-dimensional semimetal, realized in a 20-nm-wide HgTe quantum well. Experimentally, we ...observe that typical behavior of a single Andreev contact is complicated by both a pronounced zero-bias resistance anomaly and shallow subgap resistance oscillations with 1/n 1/n periodicity. These results are demonstrated to be independent of the superconducting material and should be regarded as specific to a two-dimensional semimetal in proximity with a superconductor. We interpret these effects to originate from the Andreev-like correlated process at the edge of a two-dimensional semimetal.
Herbaceous communities in forest ecosystems on the southern part of the Russian Plain appeared in the Middle Miocene (∼10 Ma BP). In the Late Miocene (∼7 Ma BP), feather-grass steppe associations ...appeared among them. In the time span of 2.7 to 2.1 Ma BP (i.e., in the Early Quaternary, according to the current chronostratigraphic scale), the steppe zone arose on the southern Russian Plain in the Don-Azov Region. Seven stages of this zone development here have been distinguished throughout the Quaternary. The first one (Eopleistocene-Early Pleistocene) was characterized by savanna-like subtropic ecosystems. Then, in the Middle Pleistocene, the temperate zone ecosystems (tallgrass prairie-like steppes) developed here and were followed by steppe ecosystems close to the modern ones in Central Europe. The ecosystems of rich-species forb steppes developed in the Late Pleistocene. Finally, in the optimum of the modern interglacial (Holocene), steppes became similar to the modern ones here, but with a slightly higher precipitation. The general trend is characterized by reduction in heat and water provision and increase in aridization progressing from earlier to later stages.
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