75 research outputs found
Hyperon weak radiative decays in chiral perturbation theory
We investigate the leading-order amplitudes for weak radiative decays of
hyperons in chiral perturbation theory. We consistently include contributions
from the next-to-leading order weak-interaction Lagrangian. It is shown that
due to these terms Hara's theorem is violated. The data for the decays of
charged hyperons can be easily accounted for. However, at this order in the
chiral expansion, the four amplitudes for the decays of neutral hyperons
satisfy relations which are in disagreement with the data. The asymmetry
parameters for all the decays can not be accounted for without higher-order
terms. We shortly comment on the effect of the 27-plet part of the weak
interaction.Comment: 8 pages of REVTeX and using macro-package "feynman.tex" (available at
http://xxx.lanl.gov/ftp/hep-ph/papers/macros) for the 2 figure
‘Wellness’ lifts us above the Food Chaos’: a narrative exploration of the experiences and conceptualisations of Orthorexia Nervosa through online social media forums
The increasing prevalence of eating disorders has motivated a burgeoning of research from narrative methods to illuminate the cultural and social aspects of disordered eating habits. A seemingly new eating disorder, Orthorexia Nervosa, has gained visibility through the internet sphere and popular media, though scholarly attention has been scarce. This study develops qualitative understandings of the fixation with ‘clean eating’ through narrative inquiry by employing an internet ethnographic approach. Data were analysed using a thematic narrative analysis, focusing on parallels and divergences across narratives presented online. This article presents 30 male and female voices, illustrating how these individuals understand their eating habits through narratives of pursuit, resistance and recovery, which are largely motivated by the desire for physical, emotional and social change. Crucially, this study illuminates a range of cultural elements enabling eating disorders in response to the transmission of cultural values online set within the broader context and processes of reflexive-modernisation
From Defiant Youth to Conformist Adulthood: The Sad Story of Liquid Helium
In this paper I discuss the properties of superfluid helium and present the different approaches to the problem of superfluidity. The gradual realization of this new liquid state brought about dramatic changes in our assessment of quantum mechanics and our reconceptualization of fluids, especially with the introduction of the notion of macroscopic quantum phenomena, which was introduced for superconductivity and superfluidity by Fritz London
Popper's tetradic schema, progressive research programs, and the case of parity violation in elementary particle physics 1953-1958
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