Off-shell effects in bound nucleons and parton distributions from 1^1H, 2^2H, 3^3H and 3^3He data

We report the results of a new global QCD analysis including deep-inelastic scattering data off $^1$H, $^2$H, $^3$H, and $^3$He targets. Nuclear corrections are treated in terms of a nuclear convolution approach with off-shell bound nucleons. The off-shell (OS) corrections responsible for the modification of the structure functions (SFs) of bound nucleons are constrained in a global fit along with the proton parton distribution functions (PDFs) and the higher-twist (HT) terms. We investigate the proton-neutron difference for the OS correction and discuss our predictions for the SF ratio $F_2^n/F_2^p$ and the corresponding PDF ratio $d/u$ in the proton, as well as their correlations with the underlying treatment of the HT terms and of the OS corrections. In particular, we find that the recent MARATHON data are consistent with equal relative OS corrections for both the proton and the neutron.Comment: Published version, 6 pages, 4 figure

Off-shell modifications of bound nucleons and parton distributions

We discuss results from our global QCD analyses including nuclear data off deuterium from various measurements, as well as off $^3$H and $^3$He targets from the MARATHON experiment. We simultaneously determine the parton distribution functions of the proton, the higher-twist terms, and the nucleon off-shell correction functions responsible for the modifications of the partonic structure in bound protons and neutrons. In particular, we study the neutron-proton asymmetry of the off-shell correction and its interplay with the treatment of the higher-twist terms. We observe that the data on the $^3$He/$^3$H cross section ratio are consistent with a single isoscalar off-shell function. We also provide our predictions on the ratio $F_2^n/F_2^p$ and on the $d$ and $u$ quark distributions in the proton and in the $^3$H and $^3$He nuclei.Comment: 6 pages, 4 figures. Presented at DIS2023: XXX International Workshop on Deep-Inelastic Scattering and Related Subjects, Michigan State University, USA, 27-31 March 202

How to reduce the suspension thermal noise in LIGO without improving the Q's of the pendulum and violin modes

The suspension noise in interferometric gravitational wave detectors is caused by losses at the top and the bottom attachments of each suspension fiber. We use the Fluctuation-Dissipation theorem to argue that by careful positioning of the laser beam spot on the mirror face it is possible to reduce the contribution of the bottom attachment point to the suspension noise by several orders of magnitude. For example, for the initial and enhanced LIGO design parameters (i.e. mirror masses and sizes, and suspension fibers' lengths and diameters) we predict a reduction of $\sim 100$ in the "bottom" spectral density throughout the band $35-100\hbox{Hz}$ of serious thermal noise. We then propose a readout scheme which suppresses the suspension noise contribution of the top attachment point. The idea is to monitor an averaged horizontal displacement of the fiber of length $l$; this allows one to record the contribution of the top attachment point to the suspension noise, and later subtract it it from the interferometer readout. For enhanced LIGO this would allow a suppression factor about 100 in spectral density of suspension thermal noise.Comment: a few misprints corrected; submitted to Classical and Quantum Gravit

Isospin Dependence of Power Corrections in Deep Inelastic Scattering

We present results of a perturbative QCD analysis of deep inelastic measurements of both the deuteron and proton structure functions. We evaluate the theoretical uncertainty associated to nuclear effects in the deuteron, and we extract simultaneously the isospin depedendence of: i)the higher twists terms; ii) the ratio of the longitudinal to transverse cross sections; iii) the ratio of the neutron to proton structure functions. The extraction of the latter, in particular, has been at the center of an intense debate. Its accurate determination is crucial both theoretically and for the interpretation of the more precise neutrino experiments including the newly planned high intensity 50 GeV proton synchrotron.Comment: 33 pages, 16 figure

Physics at the front-end of a neutrino factory: a quantitative appraisal

We present a quantitative appraisal of the physics potential for neutrino experiments at the front-end of a muon storage ring. We estimate the forseeable accuracy in the determination of several interesting observables, and explore the consequences of these measurements. We discuss the extraction of individual quark and antiquark densities from polarized and unpolarized deep-inelastic scattering. In particular we study the implications for the undertanding of the nucleon spin structure. We assess the determination of alpha_s from scaling violation of structure functions, and from sum rules, and the determination of sin^2(theta_W) from elastic nu-e and deep-inelastic nu-p scattering. We then consider the production of charmed hadrons, and the measurement of their absolute branching ratios. We study the polarization of Lambda baryons produced in the current and target fragmentation regions. Finally, we discuss the sensitivity to physics beyond the Standard Model.Comment: 73+1 pages, 33 figs. Report of the nuDIS Working Group for the ECFA-CERN Neutrino-Factory study, M.L. Mangano (convener

Determination of αs\alpha_s from Gross-Llewellyn Smith sum rule by accounting for infrared renormalon

We recapitulate the method which resums the truncated perturbation series of a physical observable in a way which takes into account the structure of the leading infrared renormalon. We apply the method to the Gross-Llewellyn Smith (GLS) sum rule. By confronting the obtained result with the experimentally extracted GLS value, we determine the value of the QCD coupling parameter which turns out to agree with the present world average.Comment: invited talk by G.C. in WG3 of NuFact02, July 1-6, 2002, London; 4 pages, revte

ПНЕВМОНИИ У БОЛЬНЫХ С БРОНХООБСТРУКТИВНЫМИ ЗАБОЛЕВАНИЯМИ, ПОЛУЧАЮЩИХ ИНГАЛЯЦИОННЫЕ ГЛЮКОКОРТИКОСТЕРОИДНЫЕ ГОРМОНЫ

Relevance. The use of inhaled glucocorticosteroids (IHCs) is one of the main basic treatment options forbroncho-obstructive diseases.IHCs suppress chronic inflammation in the bronchial tree, but can be associated with the risk of pneumonia due to impairment of bronchus mucosal immunity and increased microbial colonization in the mucosa.Aim. The aim of this study was to evaluate the incidence and risk factors of pneumonia during the IHCs therapy in patients with chronic obstructive pulmonary disease (COPD), bronchial asthma (BA), and with combination of COPD and asthma.Materials and methods. The retrospective study included patients with confirmed COPD, BA and combined COPD and asthma. The endpoint of this analysis was the incidence of pneumonia. Potential additional risk factors (age, gender, smoking, diagnosis, duration of the disease) were analyzed.Results. A total of 220 patients with broncho-obstructive pathology were included in the retrospective analysis. 184 patients received IHCs. 34 patients obtaining the basic therapy with IHCs developed pneumonia with a cumulative incidence of 36 % after 10 years. The primary diagnosis, gender, age and smoking did not significantly impact the risk of pneumonia.Conclusions. IHCs therapy is associated with a risk of pneumonia, which should be taken into account when planning long-term control of broncho-obstructive pathology.Введение. Ингаляционные глюкокортикостероиды (иГКС) являются ключевым компонентом базисной терапии бронхообструктивных заболеваний. ИГКС способствуют подавлению хронического воспаления в бронхиальном дереве, однако увеличивают риск развития пневмонии вследствие нарушений локального иммунитета в бронхах и повышения микробной колонизации слизистой.Цель – изучить частоту и факторы риска развития пневмонии на фоне терапии иГКС у больных с хронической обструктивной болезнью легких (ХОБЛ), бронхиальной астмой (БА) и сочетанием ХОБЛ и БА.Материал и методы. В ретроспективное исследование включались пациенты с доказанной ХОБЛ, БА и сочетанием ХОБЛ и БА. Конечной точкой анализа явилась частота развития пневмонии. Анализировались потенциальные дополнительные факторы риска (возраст, пол, курение, диагноз, длительность болезни).Результаты исследования. Включены 220 больных с бронхообструктивной патологией, в том числе 184 на терапии иГКС. У 34 пациентов, получавших базисную терапию иГКС, развилась пневмония с кумулятивной частотой 36 % в течение 10 лет. Первичный диагноз, пол, возраст пациентов и курение не показали значимости в качестве дополнительных факторов риска.Выводы. Терапия иГКС ассоциирована с риском развития пневмонии, что должно учитываться при планировании длительного контроля бронхообструктивной патологии

Comparative analysis of anxiety assessment methods in athletes

Objective: to identify the most effective method for anxiety assessment in athletes. Materials and methods: the selective criteria were formulated and comparative analysis of 9 most commonly used methods of assessing the level of anxiety was made. 79 athletes of combat sports were tested (34 men, 45 women) in the preparative period of training with Lusher's color test and the integrative anxiety test by A.P. Bizyuk, L.I. Wasserman, B.V. Iovlev. Results: among nine methods most frequently mentioned in the literature, Lusher's color test with the calculation of diagnostic coefficients and the integrative anxiety test by A.P. Bizyuk, L.I. Wasserman, B.V. Iovlev were most consistent with the stated criteria. There were significant correlations between the calculated indices of Luscher's color test, which have physiological explanation: the correlation between the vegetative coefficient and the total deviation from the autogenic norm, mental working capacity, situational anxiety, and between total deviation from the autogenic norm and mental performance, sex (increase in the deviation from the autologous norm corresponds to a decrease in mental performance, an increase in the level of anxiety, parasympathetic tone, and need for rest and energy accumulation). The athletes have the low level of situational anxiety and an average level of personal anxiety if compared with average population values. Conclusions: the findings complement the results of other researchers who also confirmed the validity of use of color test and integrative anxiety test in professional sports to identify the threatening breakdown of mental adaptation and psycho-correction work among athletes