Prospects for the measurement of B_s oscillations with the ATLAS detector at LHC

The prospects for the measurement of $B_{s}^{0}$ oscillations with the ATLAS detector at the Large Hadron Collider are presented. $B_{s}^{0}$ candidates in the $D_{s}^{-} \pi^{+}$ and $D_{s}^{-} a_{1}^{+}$ decay modes from semileptonic events were fully simulated and reconstructed, using a detailed detector description. The sensitivity and the expected accuracy for the measurement of the oscillation frequency were derived from unbinned maximum likelihood amplitude fits as functions of the integrated luminosity. A detailed treatment of the systematic uncertainties was performed. The dependence of the measurement sensitivity on various parameters was also evaluated.Comment: Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 4 pages LaTeX, 2 eps figure

Prospects of the measurement of Bs0 oscillations with the ATLAS detector at LHC

An estimation of the sensitivity to measure Bs-Bsbar oscillations with the ATLAS detector is given for the detector geometry of initial layout. The delta ms reach is derived from unbinned maximum likelihood amplitude fits using Bs0 events generated with a simplified Monte Carlo method.Comment: Poster at the XXVI Physics in Collision Conference (PIC06), Buzios, Brasil, July 2006, 4 pages, LaTeX, 6 eps figures. PSN THUPO0

Quasilocal Conservation Laws: Why We Need Them

We argue that conservation laws based on the local matter-only stress-energy-momentum tensor (characterized by energy and momentum per unit volume) cannot adequately explain a wide variety of even very simple physical phenomena because they fail to properly account for gravitational effects. We construct a general quasi}local conservation law based on the Brown and York total (matter plus gravity) stress-energy-momentum tensor (characterized by energy and momentum per unit area), and argue that it does properly account for gravitational effects. As a simple example of the explanatory power of this quasilocal approach, consider that, when we accelerate toward a freely-floating massive object, the kinetic energy of that object increases (relative to our frame). But how, exactly, does the object acquire this increasing kinetic energy? Using the energy form of our quasilocal conservation law, we can see precisely the actual mechanism by which the kinetic energy increases: It is due to a bona fide gravitational energy flux that is exactly analogous to the electromagnetic Poynting flux, and involves the general relativistic effect of frame dragging caused by the object's motion relative to us.Comment: 20 pages, 1 figur

Geoids in General Relativity: Geoid Quasilocal Frames

We develop, in the context of general relativity, the notion of a geoid -- a surface of constant "gravitational potential". In particular, we show how this idea naturally emerges as a specific choice of a previously proposed, more general and operationally useful construction called a quasilocal frame -- that is, a choice of a two-parameter family of timelike worldlines comprising the worldtube boundary of the history of a finite spatial volume. We study the geometric properties of these geoid quasilocal frames, and construct solutions for them in some simple spacetimes. We then compare these results -- focusing on the computationally tractable scenario of a non-rotating body with a quadrupole perturbation -- against their counterparts in Newtonian gravity (the setting for current applications of the geoid), and we compute general-relativistic corrections to some measurable geometric quantities.Comment: 24 pages, 8 figures; v2: reference added; v3: introduction clarified, reference adde

Introduction

The papers in this supplementary issue of Arctic emerged from the First International Circumpolar Symposium on Remote Sensing of Arctic Environments held in Yellowknife, Northwest Territories, 1-3 May 1990. From 1987 to 1990 personnel from the territorial government, the federal government and the private sector were trained in remote sensing techniques and applications as part of a remote sensing technology transfer program operating in the Northwest Territories. Demonstration projects were undertaken in a variety of fields and the results showed that remote sensing can be an important tool in natural resource management in the North. In order to share the knowledge and experience gained from this program and to exchange information on other programs in the circumpolar regions, a symposium was organized. This was the first symposium to deal specifically with remote sensing applications in northern environments, and the results proved to be of interest to scientists, scholars, and professionals involved in renewable and non-renewable resource management. It provided a forum for the exchange of current applied international research, the presentation of new technologies, and the advancement of international cooperation in the circumpolar regions of the world. The seven plenary sessions focused on the application of remotely sensed data to resource monitoring and management and included facilities and programs, remote sensing techniques, oceanography, hydrology, snow and ice, wildlife and wildlife habitat, geology, forestry and vegetation, and radar remote sensing. Over 80 scientists from Greenland, Norway, Denmark, the United States, Great Britain, and Canada attended the three-day symposium, which was jointly sponsored by the Department of Renewable Resources, Government of the Northwest Territories, and the Canada Centre for Remote Sensing, Energy, Mines and Resources Canada. ... This was the first of, we hope, many symposia at which northern scientists will be able to share their knowledge of the uses of remotely sensed data and geographic information systems