21,805 research outputs found
Tau Electroweak Couplings
We review world-average measurements of the tau lepton electroweak couplings,
in both decay (including Michel parameters) and in production ( and W^-\to\tau^-\nubar_\tau). We review the searches for
anomalous weak and EM dipole couplings. Finally, we present the status of
several other tau lepton studies: searches for lepton flavor violating decays,
neutrino oscillations, and tau neutrino mass limits.Comment: 12 pages, 16 figures; talk presented at Heavy Flavours 8,
Southampton, UK, 199
On the Kottwitz conjecture for local Shimura varieties
Kottwitzâs conjecture describes the contribution of a supercuspidal represention to the cohomology of a local Shimura variety in terms of the local Langlands correspondence. Using a Lefschetz-Verdier fixedpoint formula, we prove a weakened generalized version of Kottwitzâs conjecture. The weakening comes from ignoring the action of the Weil group and only considering the actions of the groups G and Jb up to non-elliptic representations. The generalization is that we allow arbitrary connected reductive groups G and non-minuscule coweights ”
Experimental Limits on Weak Annihilation Contributions to b â ulv Decays
We present the first experimental limits on high-q^2 contributions to charmless semileptonic B decays of the form expected from the weak annihilation (WA) decay mechanism. Such contributions could bias determinations of |V_(ub)| from inclusive measurements of BâX_ulÎœ. Using a wide range of models based on available theoretical input we set a limit of Î_(WA)/Î_(bâu) <7.4% (90% confidence level) on the WA fraction, and assess the impact on previous inclusive determinations of |V_(ub)|
Probing gravitational wave polarizations with signals from compact binary coalescences
In this technical note, we study the possibility of using networks of
ground-based detectors to directly measure gravitational-wave polarizations
using signals from compact binary coalescences. We present a simple data
analysis method to partially achieve this, assuming presence of a strong signal
well-captured by a GR template.Comment: Technical not
Helping students connect: architecting learning spaces for experiential and transactional reflection
Given the complex and varied contexts that inform studentsâ consciousness and occasion their learning, learning spaces are more than physical and virtual spaces. Learning spaces are also a range of situations sedimented in our continuum of experiences that shape our philosophical orientations. As such, this article, written from the perspectives of two faculty members in an English department at a four-year public university, describes our efforts to do the following. First, to draw upon models of instructional design we have experienced in our own educational backgrounds; and equally importantly, to develop learning spaces that support learning that is continuous, situated, and personal. Specifically, we critique the ways in which learning has been segregated from the rest of our life contexts for us throughout our educational histories. The irony is that this de-segregation has motivated us to create diverse learning spaces that provide our students with a more realistic set of tools and techniques for integrative life-long learning
Physical Limits of Heat-Bath Algorithmic Cooling
Simultaneous near-certain preparation of qubits (quantum bits) in their ground states is a key hurdle in quantum computing proposals as varied as liquid-state NMR and ion traps. âClosed-systemâ cooling mechanisms are of limited applicability due to the need for a continual supply of ancillas for fault tolerance and to the high initial temperatures of some systems. âOpen-systemâ mechanisms are therefore required. We describe a new, efficient initialization procedure for such open systems. With this procedure, an -qubit device that is originally maximally mixed, but is in contact with a heat bath of bias , can be almost perfectly initialized. This performance is optimal due to a newly discovered threshold effect: For bias no cooling procedure can, even in principle (running indefinitely without any decoherence), significantly initialize even a single qubit
Physical Limits of Heat-Bath Algorithmic Cooling
Simultaneous near-certain preparation of qubits (quantum bits) in their ground states is a key hurdle in quantum computing proposals as varied as liquid-state NMR and ion traps. "Closed-system" cooling mechanisms are of limited applicability due to the need for a continual supply of ancillas for fault tolerance, and to the high initial temperatures of some systems. "Open-system" mechanisms are therefore required. We describe a new, efficient initialization procedure for such open systems. With this procedure, an n-qubit device that is originally maximally mixed, but is in contact with a heat bath of bias epsilon>>2-n, can be almost perfectly initialized. This performance is optimal due to a newly discovered threshold effect: for bias epsilon<<2-n no cooling procedure can, even in principle (running indefinitely without any decoherence), significantly initialize even a single qubit
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