1,640 research outputs found
The Brera Multi-scale Wavelet Chandra Survey. I. Serendipitous source catalogue
We present the BMW-Chandra source catalogue drawn from essentially all
Chandra ACIS-I pointed observations with an exposure time in excess of 10ks
public as of March 2003 (136 observations). Using the wavelet detection
algorithm developed by Lazzati et al. (1999) and Campana et al. (1999), which
can characterise both point-like and extended sources, we identified 21325
sources. Among them, 16758 are serendipitous, i.e. not associated with the
targets of the pointings, and do not require a non-automated analysis. This
makes our catalogue the largest compilation of Chandra sources to date. The
0.5--10 keV absorption corrected fluxes of these sources range from ~3E-16 to
9E-12 erg cm^-2 s^-1 with a median of 7E-15 erg cm^-2 s^-1. The catalogue
consists of count rates and relative errors in three energy bands (total,
0.5-7keV; soft, 0.5-2keV; and hard, 2-7keV), and source positions relative to
the highest signal-to-noise detection among the three bands. The wavelet
algorithm also provides an estimate of the extension of the source. We include
information drawn from the headers of the original files, as well, and
extracted source counts in four additional energy bands, SB1 (0.5-1keV), SB2
(1-2keV), HB1 (2-4keV), and HB2 (4-7keV). We computed the sky coverage for the
full catalogue and for a subset at high Galactic latitude (|b|> 20deg). The
complete catalogue provides a sky coverage in the soft band (0.5-2keV, S/N =3)
of ~8 deg^2 at a limiting flux of 1E-13 erg cm^-2 s^-1, and ~2 deg^2 at a
limiting flux of ~1E-15 erg cm^-2 s^-1.Comment: Accepted by A&A, Higher res. Figs 4 and 5 at
http://www.ifc.inaf.it/~romano/BMC/Docs/aapaper/9601f4.eps
http://www.ifc.inaf.it/~romano/BMC/Docs/aapaper/9601f5.eps, Catalog Web
pages: http://www.brera.inaf.it/BMC/bmc_home.html
http://www.ifc.inaf.it/~romano/BMC/bmc_home.html (Mirror
Improving the discovery potential of charged Higgs bosons at the Tevatron and Large Hadron Collider
We outline several improvements to the experimental analyses carried out at
Tevatron (Run 2) or simulated in view of the Large Hadron Collider (LHC) that
could increase the scope of CDF/D0 and ATLAS/CMS in detecting charged Higgs
bosonsComment: 6 pages, 4 figures, talk given at the `Seventh Workshop on High
Energy Physics Phenomenology WHEPP-VII', Harish Chandra Research Institute,
Allahabad, India, 4-15 January 2002 (to be published by PRAMANA - Journal of
Physics
Model Predictive Control for Building Active Demand Response Systems
The Active Demand Response (ADR), integrated with the distributed energy generation and storage systems, is the most common strategy for the optimization of energy consumption and indoor comfort in buildings, considering the energy availability and the balancing of the energy production from renewable sources. In the paper an overview of basic requirements and applications of ADR management is presented. Specifically, the model predictive control (MPC) adopted in several applications as optimal control strategy in the ADR buildings context is analysed. Finally the research experience of the authors in this context is described
Associated Production of Upsilon and Weak Gauge Bosons at the Tevatron
We calculate the rate of production of W+Upsilon and Z+Upsilon at the
Tevatron. We find the cross sections at a center-of-mass energy of 1.8 TeV to
be roughly 450 pb for W+Upsilon and 150 pb for Z+Upsilon. The dominant
production mechanism involves the binding of a color-octet b-bbar pair into a
P-wave bottomonium state which subsequently decays into Upsilon. The purely
leptonic decay modes of Upsilon, W, and Z provide signatures with small
backgrounds. In Run I of the Tevatron, the number of events in the purely
leptonic decay channels before allowing for detector acceptances and
efficiencies should be about 500 for W+Upsilon and about 60 for Z+Upsilon. We
conclude that W+Upsilon events may be observable in the Run I data.Comment: 8 pages, Latex, One figure included as eps file. Minor changes made.
Version to be publishe
Single production of the top partners at high energy colliders
The left-right twin () model is a concrete realization of the
twin mechanism, which predicts the existence of the top partner . In
this paper, we consider production of associated with the top quark at
the high energy linear collider () and the experiments,
and its single production in future linac-ring type collider experiment.
To compare our results with those of the littlest model with
-parity, we also estimate production of the -even top partner via
the corresponding processes in these high energy collider experiments. A simply
phenomenological analysis is also given.Comment: 21 pages, 10 figures; to be published in Nucl. Phys.
Electroweak Corrections to the Charged Higgs Boson Decay into Chargino and Neutralino
The electroweak corrections to the partial widths of the decays including one-loop
diagrams of the third generation quarks and squarks, are investigated within
the Supersymmetric Standard Model. The relative corrections can reach the
values about 10%, therefore they should be taken into account for the precise
experimental measurement at future colliders.Comment: 21 pages, 6 eps figures, 1 Latex fil
Associated H W Production in High Energy Collisions
We study the associated production of charged Higgs bosons with gauge
bosons in high energy collisions at the one loop level. We present
the analytical results and give a detailed discussion for the total cross
section predicted in the context of a general Two Higgs Doublet Model (THDM).Comment: Latex, 31 pages, 6 figures, cosmetically improved and one reference
adde
Proposal for generalised Supersymmetry Les Houches Accord for see-saw models and PDG numbering scheme
The SUSY Les Houches Accord (SLHA) 2 extended the first SLHA to include
various generalisations of the Minimal Supersymmetric Standard Model (MSSM) as
well as its simplest next-to-minimal version. Here, we propose further
extensions to it, to include the most general and well-established see-saw
descriptions (types I/II/III, inverse, and linear) in both an effective and a
simple gauged extension of the MSSM framework. In addition, we generalise the
PDG numbering scheme to reflect the properties of the particles.Comment: 44 pages. Changed titl
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