Abstract:

While there has been substantial effort put into building Little Higgs
models, the models in the literature generically suffer from several
common problems.  In particular,  they have very complicated quartics,
they break custodial symmetry, and they are more than 10% fine-tuned.
I will discuss a new model that solves all of these problems.  Our
model has a large region of parameter space with natural electroweak
symmetry breaking, and it predicts some novel collider signatures.

Abstract:

After a short introduction to the subject of particle dark matter, I will present results for neutralino dark matter detection obtained with the help of applying Bayesian statistics to analyzing popular supersymmetric models, and compare them with recent results in direct underground searches (CDMS, etc) as well as in gamma ray searches (Fermi) and antimatter searches (PAMELA). A role of astrophysical uncertainties and the LHC connection will also be discussed.

Abstract:

Three new topics are changing the paradigm of indirect dark matter detection:

1) new precise data on the rotation curve and gas flaring in the Milky Way as well as N-body simulations suggest an enhanced dark matter (DM) density in the Galactic disc

2) new N-body simulations indicate different DM profiles for the clumpy and diffuse DM component: the clumpy component, which likely dominates the DM annihilation signal, has no cusp at the centre.

3)  the ROSAT satellite X-ray data indicates appreciable convection in the Milky Way, which leads to anisotropic propagation of charged particles in contrast to existing isotropic propagation  models.

Implications of these topics are compared (preliminary) with recent data from EGRET , FERMI, INTEGRAL and PAMELA.

Abstract:

When the current generations of detectors were planned, there was no consideration given to DC power distribution to the FE electronics. LHC detectors use linear regulators with power supplies located in a safe environment at distances of 140 m for ATLAS and 30 m for CMS. A 30% power delivery efficiency was deemed acceptable. For the next generation of detectors being designed now with 0.13 µm lithography for the FE Electronics, the operating voltage is 1.2 V and currents of 25,000 Amps, even higher due to finer segmentation. This results in delivery efficiency of 10%.

We are working on delivering power at x10 higher voltage and propose to use DC-DC converters on the same PCB as the FE ASIC chips. These have to operate in radiation of up to 100 Mrads, magnetic fields of 5T and produce very low noise.

We explore commercial (COTS) technology for DC-DC converter ICs suitable for use with air core inductors. The latter requirement is unique to HEP because of the high magnetic field.