Neutrino production coherence and oscillation experiments

Neutrino oscillations are only observable when the neutrino production, propagation and detection coherence conditions are satisfied. In this paper we consider in detail neutrino production coherence, taking \pi\to \mu \nu \ decay as an example. We compare the oscillation probabilities obtained in two different ways: (1) coherent summation of the amplitudes of neutrino production at different points along the trajectory of the parent pion; (2) averaging of the standard oscillation probability over the neutrino production coordinate in the source. We demonstrate that the results of these two different approaches exactly coincide, provided that the parent pion is considered as pointlike and the detection process is perfectly localized. In this case the standard averaging of the oscillation probability over the finite spatial extensions of the neutrino source (and detector) properly takes possible decoherence effects into account. We analyze the reason for this equivalence of the two approaches and demonstrate that for pion wave packets of finite width \sigma_{x\pi} the equivalence is broken. The leading order correction to the oscillation probability due to \sigma_{x\pi}\ne 0 is shown to be \sim [v_g/(v_g-v_\pi)]\sigma_{x\pi}/l_{osc}, where v_g and v_\pi \ are the group velocities of the neutrino and pion wave packets, and l_{osc} is the neutrino oscillation length.Comment: LaTeX, 40 pages, 4 figures. v2: minor typos correcte

Negotiating ‘otherness’ as skilled migrants

© 2018, Australian Labour and Employment Relations Association (ALERA), SAGE Publications Ltd, Los Angeles, London, New Delhi, Singapore and Washington DC. While culture is beginning to be understood as a mechanism of stratification in the labor market alongside attribute-based discrimination, we lack a corresponding understanding of how skilled migrants deal with their otherness in the labor market. This article seeks to contribute to an understanding of the lived experiences of skilled migrants by identifying the material and social consequences of performing extra work to obtain cultural legitimacy. In contrast to the recent focus on understanding cultural others’ responses to pressures for conformity in terms of identity conflict, this study identifies the context in which cultural legitimacy is required and constructed, both in terms of macro-societal and institutional influences on identity regulation within organizations as well as interactional dynamics and power relations. Based on interviews with migrants in the field of accounting and finance in Australia, I draw out the main features of ‘cultural work’ and show the potential consequences of not performing cultural work as well as the means of migrants’ resistance against pressures for conformity