Sgoldstino signature in hhhh, W+W−W^+W^- and ZZZZ spectra at the LHC

In a supersymmetric extension of the Standard Model of particle physics (SM) with low scale of supersymmetry breaking, sgoldstino of (sub)TeV mass can be observed at the Large Hadron Collider (LHC) as a peak in diboson mass spectra. Moreover, as a singlet with respect to the SM gauge group, scalar sgoldstino can mix with the SM-like Higgs boson and interfere in all neutral channels providing with the promising signatures of new physics if superpartners are heavy. Sgoldstino couplings to the SM particles are determined by the pattern of soft supersymmetry breaking parameters. Here we concentrate on the cases with a noticeable sgoldstino contribution to di-Higgs channel. Having found a phenomenologically viable region in the model parameter space where scalar sgoldstino, produced at the LHC in gluon fusion, decays into a pair of the lightest Higgs boson we give predictions for corresponding cross section. Using the results of the LHC searches for scalar resonances we place bounds on the supersymmetry breaking scale $\sqrt{F}$ in this region of parameter space. Remarkably, in this region sgoldstino may also be observed in $W^+W^-$ and $ZZ$ channels, yielding independent signatures, since their signal strengths are related to that of di-Higgs channel.Comment: 25 pages, 10 figure

Gravitational waves from first-order electroweak phase transition in a model with light sgoldstinos

We study previously unexplored possibility of triggering the first order electroweak phase transition (EWPT) by interactions of the Standard Model (SM) particles with the sector responsible for low scale supersymmetry breaking. The low-energy theory apart from the SM particles contains additional scalar degrees of freedom -- sgoldstinos -- which contribute to the effective scalar potential and thus can trigger the first order EWPT. Remarkably, the latter requires only moderate couplings in the scalar sector. The perturbative description in terms of the effective theory seems formally to be applicable upto the scale of supersymmetry breaking: the Landau pole in the scalar sector is above $10^8$-$10^9$ GeV. We calculate the gravitational wave signal generated at this transition (it can be tested, e.g. by LISA, BBO and DECIGO) and briefly discuss the collider phenomenology of this scenario.Comment: 30 pages, 5 figures, 3 tables; the estimate of uncertainties in GW spectra added, figures and tables updated; published versio

Ультрасонография черепа и скальпа у детей: обзор

INTRODUCTION: An important task of modern pediatrics is to ensure radiation safety of diagnostic examinations, especially in young children. One of the options for reducing radiation exposure at the stages of screening diagnostics and dynamic monitoring is a wider use of ultrasound.OBJECTIVE: To analyze the data of domestic and foreign literature on the possibilities of ultrasound examination of the cranial vault bones, cranial sutures and scalp in children.MATERIALS AND METHODS: The literature search was performed in open Russian and English databases Medline, PubMed, Web of Science, RSCI, eLIBRARY using keywords and phrases: «skull ultrasound», «scalp ultrasound», «cranial sutures ultrasound», «point of care ultrasound», «pediatric POCUS» without limitation of retrospective depth.RESULTS: Based on the literature data and our own long-term experience in the use of cranial ultrasonography in clinical practice, the indications and examination technique, as well as the key ultrasound signs of the most frequent types of pathology are described. Prospects of scalp and skull ultrasonography within PoCUS, FAST, including the use of portable sonoscopes based on smartphones and tablets are outlined.CONCLUSION: Ultrasound of the skull and scalp is a quick, simple, affordable, harmless method of screening and monitoring the most frequent types of pathologies of the cranial vault bones, cranial sutures, and soft tissues of the scalp in children (for example, fractures, synostoses, neoplasms).ВВЕДЕНИЕ: Важная задача современной педиатрии — обеспечение лучевой безопасности диагностических исследований, особенно у детей младших возрастных групп. Одним из вариантов снижения лучевой нагрузки на этапах скрининг-диагностики и динамического наблюдения является более широкое применение ультрасонографии.ЦЕЛЬ: Проанализировать данные отечественной и зарубежной литературы, посвященной возможностям ультразвукового исследования костей свода черепа, черепных швов и скальпа у детей.МАТЕРИАЛЫ И МЕТОДЫ: Поиск литературы осуществлялся в открытых информационных базах на русском и английском языке Medline, PubMed, Web of Science, РИНЦ, еLIBRARY по ключевым словам и словосочетаниям: «ультрасонография черепа», «ультрасонография скальпа», «ультрасонография черепных швов», «skull ultrasound», «scalp ultrasound», «cranial sutures ultrasound», «point of care ultrasound», «pediatric POCUS» без ограничения глубины ретроспекции.РЕЗУЛЬТАТЫ: На основании данных литературы и собственного многолетнего опыта применения ультрасонографии черепа в клинической практике описаны показания и методика проведения исследования, а также ключевые ультразвуковые признаки наиболее частых видов патологии. Обозначены перспективы ультрасонографии скальпа и  черепа в  рамках PoCUS, FAST, в том числе с применением портативных соноскопов, основанных на смартфонах и планшетах.ЗАКЛЮЧЕНИЕ: Ультрасонография черепа и  скальпа  — быстрый, простой, доступный, безвредный метод скрининга и мониторинга наиболее частых видов патологии костей свода черепа, черепных швов и мягких тканей волосистой части головы у детей (например, переломов, синостозов, новообразований)

FEATURES OF SIMULATION THE REFLECTION SPECTRA OF POROUS SILICON PHOTONIC CRYSTALS IN THE VISIBLE SPECTRAL RANGE

This work is devoted to simulation of the reflection spectra of porous silicon photonic structures in visible spectral range taking into account dispersion of refractive index and light absorption in partially oxidized silicon skeleton

SYNTHESIS AND CHARACTERIZATION OF AGAROSE HYDROGEL AS A FRAMEWORK FOR A FLUORESCENT BIOSENSOR

In this work, а method for the synthesis of agarose hydrogel for use as a biosensor framework has been proposed. The characteristics of the gel that are most suitable for the fabrication of layers used as a sensor backbone are determined

FLUORESCENT BIOSENSOR FOR THE REGISTRATION OF ORGANOPHOSPHORUS COMPOUNDS

A melamine sponge and agarose hydrogel biosensor with a pyrimidine-based monomolecular fluorescent probe was made. The organophosphorus pesticide malathion was used as the target analyte. The increase in the fluorescence intensity of the hydrogel upon contact with the analyte was recorded visually

Clinical features of post-COVID-19 period. Results of the international register “Dynamic analysis of comorbidities in SARS-CoV-2 survivors (AKTIV SARS-CoV-2)”. Data from 6-month follow-up

Aim. To study the clinical course specifics of coronavirus disease 2019 (COVID-19) and comorbid conditions in COVID-19 survivors 3, 6, 12 months after recovery in the Eurasian region according to the AKTIV register. Material and methods.The AKTIV register was created at the initiative of the Eurasian Association of Therapists. The AKTIV register is divided into 2 parts: AKTIV 1 and AKTIV 2. The AKTIV 1 register currently includes 6300 patients, while in AKTIV 2 — 2770. Patients diagnosed with COVID-19 receiving in- and outpatient treatment have been anonymously included on the registry. The following 7 countries participated in the register: Russian Federation, Republic of Armenia, Republic of Belarus, Republic of Kazakhstan, Kyrgyz Republic, Republic of Moldova, Republic of Uzbekistan. This closed multicenter register with two nonoverlapping branches (in- and outpatient branch) provides 6 visits: 3 in-person visits during the acute period and 3 telephone calls after 3, 6, 12 months. Subject recruitment lasted from June 29, 2020 to October 29, 2020. Register will end on October 29, 2022. A total of 9 fragmentary analyzes of the registry data are planned. This fragment of the study presents the results of the post-hospitalization period in COVID-19 survivors after 3 and 6 months. Results. According to the AKTIV register, patients after COVID-19 are characterized by long-term persistent symptoms and frequent seeking for unscheduled medical care, including rehospitalizations. The most common causes of unplanned medical care are uncontrolled hypertension (HTN) and chronic coronary artery disease (CAD) and/or decompensated type 2 diabetes (T2D). During 3- and 6-month follow-up after hospitalization, 5,6% and 6,4% of patients were diagnosed with other diseases, which were more often presented by HTN, T2D, and CAD. The mortality rate of patients in the post-hospitalization period was 1,9% in the first 3 months and 0,2% for 4-6 months. The highest mortality rate was observed in the first 3 months in the group of patients with class II-IV heart failure, as well as in patients with cardiovascular diseases and cancer. In the pattern of death causes in the post-hospitalization period, following cardiovascular causes prevailed (31,8%): acute coronary syndrome, stroke, acute heart failure. Conclusion. According to the AKTIV register, the health status of patients after COVID-19 in a serious challenge for healthcare system, which requires planning adequate health system capacity to provide care to patients with COVID-19 in both acute and post-hospitalization period