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Abstract:

GRS 1915+105 is being observed as part of an Open Time monitoring program with INTEGRAL. Three out of six observations from the monitoring program are presented here, in addition to data obtained through an exchange with other observers. We also present simultaneous RXTE observations of GRS 1915+105. During INTEGRAL Revolution 48 (2003 March 6) the source was observed to be in a highly variable state, characterized by 5-minute quasi-periodic oscillations. During these oscillations, the rise is faster than the decline, and is harder. This particular type of variability has never been observed before. During subsequent INTEGRAL revolutions (2003 March-May), the source was in a steady or "plateau" state (also known as class χaccording to Belloni et al. 2000). Here we discuss both the temporal and spectral characteristics of the source during the first three months of observations. The source was clearly detected with all three gamma-ray and X-ray instruments onboard INTEGRAL.

Abstract:

We have studied the inclusive photon spectrum in ψ(2S) decays using the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates for ψ(25) → γχ eJ(1P) (J = 0, 1, 2). We also confirm the hindered magnetic dipole (M1) transition, ψ(2S) → γη c(1S). However, the direct M1 transition ψ(2S) → γη c(2S) observed by the Crystal Ball as a narrow peak at a photon energy of 91 McV is not found in our data.

Abstract:

We describe the filtering and analysis software running in the CDF Run II Level-3 trigger as well as the client and event driven data hub system. These systems constitute critical components of the data acquisition system of the CDF detector. The Level-3 trigger is responsible for reconstructing the events and forming the final trigger decision. The Consumer-Server Logger (CSL) system receives the accepted physics events from multiple connections and writes them to disk in multiple streams while distributing them to online analysis programs (consumers). Since 2001 the system has been running successfully at high throughput rates: the Level-3 trigger reduces the event rate from 350 Hz to about 100 Hz with an average event size of 150 kB while the CSL is able to process up to 22 MB/s of constant event logging. We describe these systems in detail and report on their current performance. We briefly outline upgrade plans for the remainder of Tevatron Run II. © 2004 IEEE.