30 research outputs found
Measuring the Photon Helicity in Radiative B Decays
We propose a way of measuring the photon polarization in radiative B decays
into K resonance states decaying to K\pi\pi, which can test the Standard Model
and probe new physics. The photon polarization is shown to be measured by the
up-down asymmetry of the photon direction relative to the K\pi\pi decay plane
in the K resonance rest frame. The integrated asymmetry in K_1(1400)\to
K\pi\pi, calculated to be 0.34\pm 0.05 in the Standard Model, is measurable at
currently operating B factories.Comment: 4 pages, final version to appear in Physical Review Letter
What Have We Learned from RHIC?
In this talk, I present what I believe we have learned from the recent RHIC
heavy ion experiments. The goal of these experiments is to make and study
matter at very high energy densities, greater than an order of magnitude larger
than that of nuclear matter. Have we made such matter? What have we learned
about the properties of this matter? What do we hope and expect to learn in the
future?Comment: 34 figure
Exclusive semileptonic B decays to radially excited D mesons
Exclusive semileptonic B decays to radially excited charmed mesons are
investigated at the first order of the heavy quark expansion. The arising
leading and subleading Isgur-Wise functions are calculated in the framework of
the relativistic quark model. It is found that the 1/m_Q corrections play an
important role and substantially modify results. An interesting interplay
between different corrections is found. As a result the branching ratio for the
B-> D'e\nu decay is essentially increased by 1/m_Q corrections, while the one
for B-> D*'e\nu is only slightly influenced by them.Comment: 19 pages, revtex, 6 figures, uses rotating.st
Universal Behavior of Charged Particle Production in Heavy Ion Collisions
The PHOBOS experiment at RHIC has measured the multiplicity of primary
charged particles as a function of centrality and pseudorapidity in Au+Au
collisions at sqrt(s_NN) = 19.6, 130 and 200 GeV. Two kinds of universal
behavior are observed in charged particle production in heavy ion collisions.
The first is that forward particle production, over a range of energies,
follows a universal limiting curve with a non-trivial centrality dependence.
The second arises from comparisons with pp/pbar-p and e+e- data.
N_tot/(N_part/2) in nuclear collisions at high energy scales with sqrt(s) in a
similar way as N_tot in e+e- collisions and has a very weak centrality
dependence. This feature may be related to a reduction in the leading particle
effect due to the multiple collisions suffered per participant in heavy ion
collisions.Comment: 4 Pages, 5 Figures, contributed to the Proceedings of Quark Matter
2002, Nantes, France, 18-24 July 200
Production and Decay of Scalar Stoponium Bound States
In this paper we discuss possible signatures for the production of scalar
\stst\ (stoponium) bound states \sigst\ at hadron colliders, where \st\ is the
lighter scalar top eigenstate. We first study the decay of \sigst; explicit
expressions are given for all potentially important decay modes. If \st\ has
unsuppressed two--body decays, they will always overwhelm the annihilation
decays of \sigst. Among the latter, we find that usually either the or
final state dominates, depending on the size of the off--diagonal entry of
the stop mass matrix; is the lighter neutral scalar Higgs boson of the
minimal supersymmetric model. If \msig\ happens to be close to the mass of one
of the neutral scalar Higgs bosons, final states dominate ( or
). \ww\ and final states are subdominant. We argue that \sigst
\rightarrow \gamgam decays offer the best signal for stoponium production at
hadron colliders. The tevatron should be able to close the light stop window
left open by LEP searches, but its mass reach is limited to \msig \leq 90
GeV. In contrast, at the LHC one should ultimately be able to probe the region
\msig \leq 700 GeV, if the partial width is not too large. We also
comment on the feasibility of searching for \sigst\ production at hadron
colliders in the and \fourtau\ final states, and briefly
mention \sigst\ production at \gamgam\ colliders.Comment: 31 pages plus 10 figures (available from DREES@WISCPHEN); LaTeX with
equation.sty; MAD/PH/808, KEK-TH-37
Effectiveness of encapsulation and object-oriented metrics to refactor code and identify error prone classes using bad smells
Quality of life in people with chronic hemodialysis: association with sociodemographic, medical-clinical and laboratory variables Calidad de vida de personas en hemodiálisis crónica: relación con variables sociodemográficas, médico-clínicas y de laboratorio Qualidade de vida de pessoas em hemodiálise crônica: relação com variáveis sociodemográficas, médico-clínicas e de laboratório
AIM: determine the quality of life for people in chronic hemodialysis and its association with sociodemographic, medical-clinical and laboratory variables. METHOD: exploratory, descriptive, cross-sectional study with stratified probability sampling. Quality of life was assessed using the KDQOL-36TM. Data were analyzed using SPSS statistical software. RESULTS: 354 people in chronic hemodialysis had low scores on most dimensions of quality of life, mainly Burden of Disease, Physical and Mental Component. Age, sex, education, income, time on dialysis, etiology of the disease, smoking, hospitalizations, albumin, creatinine and transplants were related. The results reveal multiple factors related to quality of life. CONCLUSION: there is a need to research on other aspects that permit focusing and optimizing the nursing care for these people.<br>OBJETIVO: determinar la calidad de vida de personas en hemodiálisis crónica y su relación con variables sociodemográficas, médico-clínicas y de laboratorio. MÉTODO: estudio exploratorio, descriptivo, transaccional con muestreo probabilístico estratificado. Calidad de vida fue evaluada mediante el instrumento KDQOL-36TM. Los datos fueron analizados con el programa estadístico SPSS. RESULTADOS: 354 personas en hemodiálisis crónica presentaron puntuaciones bajas en la mayoría de las dimensiones de calidad de vida, principalmente Carga de la Enfermedad, Componente Físico y Mental. Edad, sexo, escolaridad, ingresos económicos, tiempo en diálisis, etiología de la enfermedad, cigarrillo, hospitalizaciones, número medicamentos, albúmina, creatinina, trasplantes resultaron relacionados. Los resultados revelan múltiples factores relacionados con la calidad de vida. CONCLUSIÓN: existe necesidad de investigar otros aspectos que permitan enfocar y optimizar el cuidado de enfermería dirigido a estas personas.<br>OBJETIVO: determinar a qualidade de vida de pessoas em hemodiálise crônica e sua relação com variáveis sociodemográficas, médico-clínicas e de laboratório. MÉTODO: estudo exploratório, descritivo, transacional com amostragem de probabilidade estratificada. Qualidade de vida foi avaliada mediante o instrumento KDQOL-36TM. Os dados foram analisados com o programa estatístico SPSS. RESULTADOS: 354 pessoas em hemodiálise crônica apresentaram pontuações baixas na maioria das dimensões de qualidade de vida, principalmente carga da doença, componente físico e mental. Foram encontradas associações com idade, sexo, escolaridade, renda, tempo em diálise, etiologia da doença, cigarro, hospitalizações, quantidade de remédios, albumina, creatina e transplantes. Os resultados revelam múltiplos fatores relacionados à qualidade de vida. CONCLUSÃO: existe a necessidade de se investigar outros aspectos que permitam enfocar e otimizar o cuidado da enfermagem dirigido a essas pessoas
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Patient-Level Artificial Intelligence–Enhanced Electrocardiography in Hypertrophic Cardiomyopathy Longitudinal Treatment and Clinical Biomarker Correlations
BackgroundArtificial intelligence (AI) applied to 12-lead electrocardiographs (ECGs) can detect hypertrophic cardiomyopathy (HCM).ObjectivesThe purpose of this study was to determine if AI-enhanced ECG (AI-ECG) can track longitudinal therapeutic response and changes in cardiac structure, function, or hemodynamics in obstructive HCM during mavacamten treatment.MethodsWe applied 2 independently developed AI-ECG algorithms (University of California-San Francisco and Mayo Clinic) to serial ECGs (n = 216) from the phase 2 PIONEER-OLE trial of mavacamten for symptomatic obstructive HCM (n = 13 patients, mean age 57.8 years, 69.2% male). Control ECGs from 2,600 age- and sex-matched individuals without HCM were obtained. AI-ECG output was correlated longitudinally to echocardiographic and laboratory metrics of mavacamten treatment response.ResultsIn the validation cohorts, both algorithms exhibited similar performance for HCM diagnosis, and exhibited mean HCM score decreases during mavacamten treatment: patient-level score reduction ranged from approximately 0.80 to 0.45 for Mayo and 0.70 to 0.35 for USCF algorithms; 11 of 13 patients demonstrated absolute score reduction from start to end of follow-up for both algorithms. HCM scores were significantly associated with other HCM-relevant parameters, including left ventricular outflow tract gradient at rest, postexercise, and with Valsalva, and NT-proBNP level, independent of age and sex (all P < 0.01). For both algorithms, the strongest longitudinal correlation was between AI-ECG HCM score and left ventricular outflow tract gradient postexercise (slope estimate: University of California-San Francisco 0.70 [95% CI: 0.45-0.96], P < 0.0001; Mayo 0.40 [95% CI: 0.11-0.68], P = 0.007).ConclusionsAI-ECG analysis longitudinally correlated with changes in echocardiographic and laboratory markers during mavacamten treatment in obstructive HCM. These results provide early evidence for a potential paradigm for monitoring HCM therapeutic response