Search for the tensor glueball Klempt, E.; Nikonov, K.V.; Sarantsev, A.V. ...
Physics letters. B,
07/2022, Letnik:
830
Journal Article
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The tensor glueball is searched for in BESIII data on radiative J/ψ decays into π0π0 and KsKs. The ππ invariant mass distribution exhibits an enhancement that can be described by a pole at ...(2210±60)−i(180±60)MeV or by three of ϕϕ resonances suggested a long time ago to be the trace of one, two or three glueballs. We speculate that several high-mass tensor mesons might have qq¯ and glueball components.
Zonulin content in blood serum of patients with colorectal cancer (CRC;
n
=152; 30-84 years) and patients with large bowel adenomas (
n
=32; 39-82 years) was measured by standardized kit IDK Zonulin ...ELISA (Immundiagnostik AG). The healthy control group (
n
=50) comprised volunteers (27 women, 23 men; 25-68 years); pathological control group (
n
=84) — patients (55 women, 29 men;18-84 years) with irritable bowel syndrome (
n
=29), Crohn’s disease (
n
=5), and ulcero-necrotic colitis (
n
=50). In comparison to healthy control group, the level of zonulin was significantly increased in CRC patients (
p
<0.0000001) and in patients with benign large bowel tumors (
p
<0.004), as well as in patients with inflammatory intestine diseases and with irritable bowel syndrome (
p
<0.0002). Zonulin level in blood serum of CRC patients was slightly, but significantly higher (
p
<0.05) than in the group of pathological control. ROC curve construction revealed that at optimal zonulin cut-off level (52.2 ng/ml), the diagnostic sensitivity of CRC detection was 66.7% and specificity relative to healthy control was 81.8%. The specificity relative to the combined control group (healthy control+non-tumor bowel diseases) was only 68.9%. Thus, no acceptable cut-off levels for differentiation between malignant and benign tumors, as well as between tumor and non-tumor large bowel pathologies were found. Analysis of the associations between serum zonulin level and the main clinical and pathological characteristics of CRC demonstrated that the level of this marker increased with disease progression (
p
<0.01; Kruskal—Wallis test), but was not associated with individual criteria of the TNM system, tumor localization, histological structure, and malignancy grade.
Abstract
Experimental study of the rates of plasma-chemical deposition of diamond-like coatings in toluene vapour in capacitive RF discharge was carried out. It is shown that in the RF power range of ...100-300 W, the deposition rate is mainly affected by the toluene pressure in the vacuum chamber. The maximum deposition rate obtained was 4.15 μm/h.
A pulsed RF discharge is considered experimentally as a working process of an RF ion source. It is shown that an increase in the ion current can be obtained in comparison with the continuous ...operation mode when such a discharge is operating. This increase is the greater, the greater the difference between the characteristic time of the drop of the ion current after turning off the RF power and the rise time of the ion current when the RF power is turned on. The pulsation parameters at which the ion current is maximized are estimated. It is shown that an external constant longitudinal magnetic field in the range of 0–7.2 mT nonmonotonically affects the maximum and equilibrium value of the ion current in a pulse and does not affect the decrease rate of the ion current after the RF power is turned off.
The paper presents the results of an experimental study of the axial structure of the longitudinal RF magnetic field and parameters of the plasma of an inductive low-power plasma source placed in a ...magnetic field of 12–72 G. It is shown that, already in a magnetic field of 24 G, a nonmonotonic dependence of the longitudinal component of the RF magnetic field on the axial coordinate is clearly manifested. The change in the phase of the RF field indicates that a partially traveling wave is formed in the discharge. Probe measurements show that the electron energy distribution function is enriched with fast electrons whose velocity correlates with the phase velocity of the wave.
The properties of an inductive RF discharge placed in a longitudinal external magnetic field with an induction of less than 70 G at frequencies of 2, 4, and 13.56 MHz are studied. The dependences of ...the region of existence of the discharge, the efficiency of the RF power input and the structure of the RF magnetic field on the external magnetic field induction are studied experimentally. The experimental results are compared with calculations based on a previously developed electromagnetic discharge model. It is shown that the local maximum of the plasma density observed at weak magnetic fields is associated with the resonant excitation of waves in the plasma source. The excited wave is close to a transverse helicon at a frequency of 2 MHz, and its properties approach the Trivelpiece–Gould wave at a frequency of 13.56 MHz,.
The results of an experimental study of a low-power RF plasma source placed in a longitudinal magnetic field (helicon thruster), when it operates on a capacitive RF discharge and inductive RF ...discharges with a capacitive component, are presented. A significant dependence of the characteristics of the ion and electron fluxes of the source on the induction of a constant magnetic field is shown. The fundamental applicability of capacitive RF discharge as a working process in the studied plasma source is demonstrated. It is shown that the increase in the average energy of ions in the flow at the outlet of the source with the appearance of the capacitive component of the discharge is slight.
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The paper presents the results of an experimental study of a low-power RF inductive plasma source placed in a longitudinal magnetic field. The measurements show the formation of an ion-accelerating ...potential drop at the source output with its value depending on the magnetic field and the flow rate of the working gas. The parameters of the electron and ion flows generated by the source nonmonotonically change with the magnetic field. In the main range of the studied magnetic fields, the electron flux generated by the source at the axis of the system exceeds the ion flux, and the average electron energy increases with the magnetic field.
Branching ratios for the decay of hadrons with large width or near thresholds depend on their definition. We test different definitions and show that rather different branching ratios can be ...obtained. For wide resonances and for sequential decays with wide intermediate resonances, integration over the spectral functions is mandatory. The tests are performed exploiting the latest solution of the Bonn-Gatchina multi-channel analysis and published values for residues of light scalar mesons. For a resonance overlapping with a threshold, in case its pole lies in a non-adjacent sheet, we show how the total width, needed for the branching ratios, does not correspond to the imaginary part of the pole position. We use the Madrid-Krakow dispersive parameterizations to illustrate this situation with the f0(980).
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