We present a new analysis of previously published SuperCDMS data using a profile likelihood framework to search for sub-GeV dark matter (DM) particles through two inelastic scattering channels: ...bremsstrahlung radiation and the Migdal effect. By considering these possible inelastic scattering channels, experimental sensitivity can be extended to DM masses that are undetectable through the DM-nucleon elastic scattering channel, given the energy threshold of current experiments. We exclude DM masses down to 220 MeV/c2 at 2.7 x 10-30 cm2 via the bremsstrahlung channel. The Migdal channel search provides overall considerably more stringent limits and excludes DM masses down to 30 MeV/ c2 at 5.0 x 10-30 cm2.
Describes how private-sector management strategies can help governments obtain greater access to global resources, create more jobs, and provide better social services to their citizens.
Why the Self Is Empty Cushman, Philip
The American psychologist,
05/1990, Letnik:
45, Številka:
5
Journal Article
Recenzirano
This article presents a contextualized treatment of the current configuration of self, some of the pathologies that plague it, and the technologies that attempt to heal it. Of particular interest is ...the historical shift from the Victorian, sexually restricted self to the post-World War II empty self. The empty self is soothed and made cohesive by becoming "filled up" with food, consumer products, and celebrities. Its historical antecedents, economic constituents, and political consequences are the focus of this article. The two professions most responsible for healing the empty self, advertising and psychotherapy, find themselves in a bind: They must treat a psychological symptom without being able to address its historical causes. Both circumvent the bind by employing the life-style solution, a strategy that attempts to heal by covertly filling the empty self with the accoutrements, values, and mannerisms of idealized figures. This strategy solves an old problem but creates new ones, including an opportunity for abuse by exploitive therapists, cult leaders, and politicians. Psychology's role in constructing the empty self, and thus reproducing the current hierarchy of power and privilege, is examined.
The scattering of dark matter particles off nuclei in direct detection experiments can be described in terms of a multidimensional effective field theory (EFT). Here a new systematic analysis ...technique is developed using the EFT approach and Bayesian inference methods to exploit, when possible, the energy-dependent information of the detected events, experimental efficiencies, and backgrounds. Highly dimensional likelihoods are calculated over the mass of the weakly interacting massive particle (WIMP) and multiple EFT coupling coefficients, which can then be used to set limits on these parameters and choose models (EFT operators) that best fit the direct detection data. Expanding the parameter space beyond the standard spin-independent isoscalar cross section and WIMP mass reduces tensions between previously published experiments. Combining these experiments to form a single joint likelihood leads to stronger limits than when each experiment is considered on its own. Simulations using two nonstandard operators ($\mathscr{O}$3 and $\mathscr{O}$8) are used to test the proposed analysis technique in up to five dimensions and demonstrate the importance of using multiple likelihood projections when determining constraints on WIMP mass and EFT coupling coefficients. In particular, this shows that an explicit momentum dependence in dark matter scattering can be identified.
Through case studies of communication best practices at Dell, General Electric, Microsoft, and Monsanto, this book provides specific and powerful theories for leadership, marketing, and stockholder ...communication. Best practice limitations are also revealed in the cases of IBM, the Bumper Works, and Asea Brown and Boveri, where organizational learning, a firm’s timeline, and corporate culture made implementation difficult. Taken collectively, these case studies suggest several ways in which benchmarking can become an important research methodology and theorist tool for understanding excellence in organizational practice.
The Brookhaven muon storage ring magnet Danby, G.T.; Addessi, L.; Armoza, Z. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2001, Letnik:
457, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The muon g-2 experiment at Brookhaven National Laboratory has the goal of determining the muon anomalous
g-value
a
μ
(=(g−2)/2)
to the very high precision of 0.35 parts per million and thus requires ...a storage ring magnet with great stability and homogeniety. A superferric storage ring with a radius of 7.11 m and a magnetic field of 1.45 T has been constructed in which the field quality is largely determined by the iron, and the excitation is provided by superconducting coils operating at a current of 5200 A. The storage ring has been constructed with maximum attention to azimuthal symmetry and to tight mechanical tolerances and with many features to allow obtaining a homogenous magnetic field. The fabrication of the storage ring, its cryogenics and quench protection systems, and its initial testing and operation are described.
We measured the nuclear-recoil ionization yield in silicon with a cryogenic phonon-sensitive gram-scale detector. Neutrons from a mono-energetic beam scatter off of the silicon nuclei at angles ...corresponding to energy depositions from 4 keV down to 100 eV, the lowest energy probed so far. The results show no sign of an ionization production threshold above 100 eV. In conclusion, these results call for further investigation of the ionization yield theory and a comprehensive determination of the detector response function at energies below the keV scale.
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