Measurements of top quark properties at CDF

The top quark with its mass of about 172 GeV/c^2 is the most massive fundamental particle observed by experiment. In this talk we highlight the most recent measurements of several top quark properties performed with the CDF detector based on data samples corresponding to integrated luminosities up to 1 fb-1. These results include a search for top quark pair production via new massive resonances, measurements of the helicity of the W boson from top-quark decay, and a direct limit on the lifetime of the top quark.Comment: Proceedings for ICHEP 2006 (Jul 26 - Aug 2), Moscow, Russi

The SED of the nearby HI-massive LIRG HIZOA J0836-43: from the NIR to the radio domain

HIZOA J0836-43is one of the most HI-massive galaxies in the local (z<0.1) Universe. Not only are such galaxies extremely rare, but this "coelacanth" galaxy exhibits characteristics -- in particular its active, inside-out stellar disk-building -- that appear more typical of past (z ~ 1) star formation, when large gas fractions were more common. Unlike most local giant HI galaxies, it is actively star forming. Moreover, the strong infrared emission is not induced by a merger event or AGN, as is commonly found in other local LIRGs. The galaxy is suggestive of a scaled-up version of local spiral galaxies; its extended star formation activity likely being fueled by its large gas reservoir and, as such, can aid our understanding of star formation in systems expected to dominate at higher redshifts. The multi-wavelength imaging and spectroscopic observations that have led to these deductions will be presented. These include NIR (J H K) and MIR (Spitzer; 3-24micron) imaging and photometry, MIR spectroscopy, ATCA HI-interferometry and Mopra CO line emission observations. But no optical data, as the galaxy is heavily obscured due to its location in Vela behind the Milky Way.Comment: 5 pages, 3 figures, to appear in the proceedings of IAU Symposium 284, "The Spectral Energy Distribution of Galaxies" (SED2011), 5-9 September 2011, Preston, UK, editors R.J. Tuffs & C.C.Popesc

Cosmological Structures behind the Milky Way

This paper provides an update to the review on extragalactic large-scale structures uncovered in the Zone of Avoidance (ZOA) by Kraan-Korteweg & Lahav 2000, in particular in the Great Attractor region. Emphasis is given to the penetration of the ZOA with the in 2003 released NIR 2MASX Catalog. The distribution is little affected by the foreground dust. Galaxies can be identified to extinction levels of over A(B) < 10m except in the wider Galactic Bulge region (see Fig. 9) where star density is a strong delimiting factor. The shape of the NIR-ZOA is quite asymmetric due to Galactic features such as spiral arms and the Bulge, something that should not be ignored when using NIR samples for studies such as dipole determinations. Results are presented from the deep blind HI ZOA survey performed with the Multibeam Receiver at the Parkes telescope (v < 12700km/s). The distribution of the roughly one thousand discovered spiral galaxies in the optically and NIR impenetratable part of the ZOA clearly depict the prominence of the Norma Supercluster. With the optically identified galaxies in the ZOA, a picture emerges that bears a striking resemblance to the Coma cluster in the Great Wall: the rich Norma cluster (ACO 3627) lies within a great-wall like structure that can be traced at the redshift range of the cluster over 90dg on the sky, with two foreground filaments - reminiscent of the legs in the famous stick man - that merge in an overdensity at slightly lower redshifts around the radio galaxy PKS 1343-601 (see Figs. 14 & 16). (abridged)Comment: Invited Review at the joint conference of the Czech Astron. Society and the Astron. Gesellschaft. To appear in Reviews in Modern Astronomy 18, on ``From Cosmological Structures to the Milky Way'', ed. S. Roeser, 30pages, 16 ps-figures. Full resolution gzipped ps-version (16Mb) available at http://mensa.ast.uct.ac.za/~kraan/AGreview/AGreview.ps.g

A Catalog of Galaxies behind the Southern Milky Way. - I. The Hydra/Antlia Extension (l: 266 - 296 deg)

A deep optical galaxy search in the southern Milky Way - aimed at reducing the width of the Zone of Avoidance - revealed 3279 galaxy candidates above the diameter limit of D > 0.2 arcmin, of which only 112 (3.4%) were previously catalogued. The surveyed region (266 < l < 296 and -10 < b < +8) lies in the extension of the Hydra and Antlia clusters - where a supercluster is suspected - and in the approximate direction of the dipole anisotropy in the Cosmic Microwave Background radiation. Here we present the optical properties of the unveiled galaxies such as positions, diameters, magnitudes, morphological types, including a detailed discussion on the quality of these data and the completeness limits as a function of the foreground dust extinction. For 127 of the 227 positional matches in the IRAS PSC, a reliable cross-identification could be found. Several distinct overdensities and filaments of galaxies can be identified that are apparently uncorrelated with the Galactic foreground extinction hence the probable signature of extragalactic large-scale structures. This catalog constitutes the first part in a series of five equally conducted optical searches for galaxies in the southern Milky Way (245 < l < 350). With these surveys, the entire Zone of Avoidance will have been covered by means of visual inspection. The catalogs build the basis for various spectroscopic and photometric follow-up programs which eventually will allow a thorough analyse of the galaxy distribution in redshift space and the peculiar velocity fields within the Zone of Avoidance, as well an an improved understanding of the Galactic foreground extinction.Comment: Accepted for publication by A&ASS, 50 pages, LaTex, 7 encapsulated figures, requires aa.cls end epsf.sty. Full-resolution, color figures 1, 2, 6 and 7 are available upon request (E-mail: [email protected]

Large-Scale Structures Behind the Southern Milky Way from Observations of Partially Obscured Galaxies

We report here on extragalactic large-scale structures uncovered by a deep optical survey for galaxies behind the southern Milky Way. Systematic visual inspection of the ESO/SRC-survey revealed over 10000 previously unknown galaxies in the region 265 < l < 340, |b| < 10. With subsequently obtained redshifts of more than 10% of these galaxies, new structures across the Milky Way are unveiled, such as a filament at ~ 2500 km/s connecting to the Hydra and Antlia clusters, a shallow extended supercluster in Vela (~ 6000km/s), and a nearby (4882 km/s), very massive (M ~ 2-5 10^15 Msun), rich Coma-like cluster which seems to constitute the previously unidentified center of the Great Attractor. The innermost part of the Milky Way where the foreground obscuration in the blue is 5mag, respectively HI-column densities greater than 6 10^21 / cm^2 remains fully opaque. In this approximately 8 degrees wide strip, the forthcoming blind HI-survey with the multi-beam system at Parkes will provide the only tool to unveil this part of the extragalactic sky.Comment: Presented at the Multibeam Workshop on ``HI in the Local Universe'', Sydney, May 13-15 1996. Accepted 2.11.1996 for publication by PASA. Latex-file with 4 encapsulated postscript files. Version with original figures available at http://www.atnf.csiro.au/~lstavele/13beam/proceedings/korteweg/korteweg.htm

Quarkonium Production Studies in CMS

When the LHC starts its operation, CMS will have a unique opportunity to study q uarkonium production in pp collisions and later in PbPb collisions. Here we report on the methods and plans for measuring the differential pT Jpsi->mu+mu- production cross section, using data to be collected in the first LHC run by the CMS detector. Furthermore we discuss the performance of the CMS detector for quarkonium measurements in PbPb collisions.Comment: Presented at the 34th International Conference on High Energy Physic

Monopole Constituents inside SU(n) Calorons

We present a simple result for the action density of the SU(n) charge one periodic instantons - or calorons - with arbitrary non-trivial Polyakov loop P_oo at spatial infinity. It is shown explicitly that there are n lumps inside the caloron, each of which represents a BPS monopole, their masses being related to the eigenvalues of P_oo. A suitable combination of the ADHM construction and the Nahm transformation is used to obtain this result.Comment: 8 pages, 1 figure (in three parts), late