62 research outputs found
The Lowest Order Hadronic Contribution to the Muon Value with Systematic Error Correlations
We have performed a new evaluation of the hadronic contribution to
of the muon with explicit correlations of systematic errors
among the experimental data on . Our result for
the lowest order hadronic vacuum polarization contribution is where the the first error is statistical and
the second is systematic. The total systematic error contributions from below
and above GeV are and respectively, and are hence dominated by the low energy region.
Therefore, new measurements on below 1.4 GeV can
significantly reduce the total error on . In particular, the
effect on the total errors of new hypothetical data with 3 \% statistical and
0.5 - 1.0 \% systematic errors is presented.Comment: LaTeX with REVTeX style and options: multicol,aps,psfig. 18 pages,
postscript figures included after text. Accepted in Phys. Rev. D (~ Sept
1996
Recommended from our members
Preliminary results from the CMD-2 detector
A new general-purpose detector CMD-2 (calorimetric magnetic detector has started experiments at the upgraded e{sup {plus}}e{sup {minus}} collider VEPP-2M (collider for electron-positron beams) at Novosibirsk. During early runs an integrated luminosity of about 400 inverse nanobarns has been collected in the center of mass energy range 400{endash}1030 MeV
Coronavirus disease 2019 (COVID-19) pandemic across Africa : current status of vaccinations and implications for the future
The introduction of effective vaccines in December 2020 marked a significant step forward in the global response to COVID-19. Given concerns with access, acceptability, and hesitancy across Africa, there is a need to describe the current status of vaccine uptake in the continent. An exploratory study was undertaken to investigate these aspects, current challenges, and lessons learnt across Africa to provide future direction. Senior personnel across 14 African countries completed a self-administered questionnaire, with a descriptive analysis of the data. Vaccine roll-out commenced in March 2021 in most countries. COVID-19 vaccination coverage varied from low in Cameroon and Tanzania and up to 39.85% full coverage in Botswana at the end of 2021; that is, all doses advocated by initial protocols versus the total population, with rates increasing to 58.4% in Botswana by the end of June 2022. The greatest increase in people being fully vaccinated was observed in Uganda (20.4% increase), Botswana (18.5% increase), and Zambia (17.9% increase). Most vaccines were obtained through WHO-COVAX agreements. Initially, vaccination was prioritised for healthcare workers (HCWs), the elderly, adults with co-morbidities, and other at-risk groups, with countries now commencing vaccination among children and administering booster doses. Challenges included irregular supply and considerable hesitancy arising from misinformation fuelled by social media activities. Overall, there was fair to reasonable access to vaccination across countries, enhanced by government initiatives. Vaccine hesitancy must be addressed with context-specific interventions, including proactive programmes among HCWs, medical journalists, and the public
Urinary parabens and polyaromatic hydrocarbons independent of health conditions are associated with adult emotional support needs:USA NHANES, 2005–2008
Urinary parabens and polyaromatic hydrocarbons independent of health conditions are associated with adult emotional support needs: USA NHANES, 2005–2008
The dynamics of epidural and opioid analgesia during labour
Erworben im Rahmen der Schweizer Nationallizenzen (http://www.nationallizenzen.ch)Purpose: To investigate the association of analgesia, opioids or epidural, or the combination of both with labour duration and spontaneous birth in nulliparous women.
Methods: A secondary data analysis of an existing cohort study was performed and included nulliparous women (n = 2074). Durations of total labour and first and second labour stage were calculated with Kaplan-Meier estimation for the four different study groups: no analgesia (n = 620), opioid analgesia (n = 743), epidural analgesia (n = 482), and combined application (n = 229). Labour duration was compared by Cox regression while adjusting for confounders and censoring for operative births. Logistic regression was used to investigate the association between the administration of different types of analgesia and mode of birth.
Results: Most women in the combined application group were first to receive opioid analgesia. Women with no analgesia had the shortest duration of labour (log rank p < 0.001) and highest chance of a spontaneous birth (p < 0.001). If analgesia was administered, women with opioids had a shorter first stage (p = 0.018), compared to women with epidural (p < 0.001) or women with combined application (p < 0.001). Women with opioids had an increased chance to reach full cervical dilatation (p = 0.006). Women with epidural analgesia (p < 0.001) and women with combined application (p < 0.001) had a prolonged second stage and decreased chance of spontaneous birth compared to women without analgesia.
Conclusions: Women with opioids had a prolonged first stage, but increased chance to reach full cervical dilatation. Women with epidural analgesia and women with both opioid and epidural analgesia had a prolonged first and second stage and a decreased chance of a spontaneous birth
Fractional Generalizations of Maxwell and Kelvin-Voigt Models for Biopolymer Characterization
- …