The Determination of alpha_s from Tau Decays Revisited

We revisit the determination of alpha_s(m_tau) using a fit to inclusive tau hadronic spectral moments in light of (1) the recent calculation of the fourth-order perturbative coefficient K_4 in the expansion of the Adler function, (2) new precision measurements from BABAR of e+e- annihilation cross sections, which decrease the uncertainty in the separation of vector and axial-vector spectral functions, and (3) improved results from BABAR and Belle on tau branching fractions involving kaons. We estimate that the fourth-order perturbative prediction reduces the theoretical uncertainty, introduced by the truncation of the series, by 20% with respect to earlier determinations. We discuss to some detail the perturbative prediction and show that the effect of the incomplete knowledge of the series is reduced by using the so-called contour-improved calculation, as opposed to fixed-order perturbation theory which manifests convergence problems. The corresponding theoretical uncertainties are studied at the tau and Z mass scales. Nonperturbative contributions extracted from the most inclusive fit are small, in agreement with earlier determinations. Systematic effects from quark-hadron duality violation are estimated with simple models and found to be within the quoted systematic errors. The fit gives alpha_s(m_tau) = 0.344 +- 0.005 +- 0.007, where the first error is experimental and the second theoretical. After evolution to M_Z we obtain alpha_s(M_Z) = 0.1212 +- 0.0005 +- 0.0008 +- 0.0005, where the errors are respectively experimental, theoretical and due to the evolution. The result is in agreement with the corresponding NNNLO value derived from essentially the Z width in the global electroweak fit. The alpha_s(M_Z) determination from tau decays is the most precise one to date.Comment: 22 pages, 7 figure

Study of the process e+e−→3(π+π−) in the c.m. energy range 1.5–2.0 GeV with the CMD-3 detector

AbstractThe cross section of the process e+e−→3(π+π−) has been measured using a data sample of 22 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. 7956 signal events are selected in the center-of-mass energy range 1.5–2.0 GeV. The measured cross section exhibits a sharp drop near the pp¯ threshold. A first study of dynamics of six-pion production has been performed

Autological fibrin matrixs: Prospect surgery use

The article presents a technique for obtaining autologous carriers of tissue micrografts, or scaffolds, based on the interaction of fibrin and cells of the implanted material, as well as a method for the controlled production of autologous tissue matrices of the required volume, which are easily modeled. The processes of formation of a fibrin clot, its main physical characteristics have been investigated. The process of matrix gel compaction is considered, which significantly stimulates the attachment of tissue micrografts to the scaffold surface, which promotes metabolic processes. © 2021, Human Stem Cell Institute. All rights reserved

Autologic platelet-rich plasma use in varicocelectomy

Varicocele is a disease that is diagnosed in approximately 10% of males’ population. There is data of varicocele which consider the condition as one of the most common causes of male infertility. It is only surgical treatment, to date, that is effective one. However, there is still a group of patients whose fertility problem have not been resolved with the varicocelectomy, that have led scientists to find new ways for treating male infertility. Regenerative medicine and platelet-rich plasma (PRP), in particular, have recently grown up rapidly worldwide. Many preclinical and clinical trials have already demonstrated PRP-therapy effectiveness and safety, de-spite the novelty of the method. This is why the interest in use PRP-therapy for treating male infertility has increased. © 2020, Human Stem Cell Institute. All rights reserved

Results from the

Two e+e− colliders, VEPP-4M and VEPP2000, are taking data at the Budker INP in Novosibirsk, Russia. KEDR detector at the VEPP-4M collider continues deliver precision measurements of the charmonium family. Results of the ψ(2S ) and ψ(3770) study are presented. Two energy scans of a center-of-mass energy range from 1 GeV to 2 GeV has been performed by the VEPP2000 collider with an integrated luminosity of about 35 pb−1, collected by each of the CMD-3 and SND detectors. This paper reports the latest results from VEPP-2000 obtained by the CMD-3 collaboration