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Review of Charm and Beauty Lifetimes

Description: A review of the latest experimental results on charm and beauty particle lifetimes is presented together with a brief summary of measurement methods used for beauty particle lifetime measurements. There have been significant updates to the D{sub s}{sup +}/D{sup 0}, B{sup +}/B{sub d}{sup 0} and {Lambda}{sub b}{sup 0}/B{sub d}{sup 0} lifetime ratios which have some theoretical implications. However more precise measurements are still needed before one can make conclusive statements about the theory used to calculate the particle lifetimes.
Date: February 5, 1999
Creator: Cheung, Harry W. K.
Partner: UNT Libraries Government Documents Department

Preliminary Report on Existing Active Particle Hazard-200 Areas

Description: "Recent surveys by the Health Instrument Section have disclosed the presence of many small radioactive spots on ground surfaces in the T and B plant areas. Investigation has shown that representative samples of the spots when mechanically separated invariably end in a single radioactive particle."
Date: October 22, 1947
Creator: Mickelson, M. L.
Partner: UNT Libraries Government Documents Department

Neutron Production by High-Energy Particles

Description: Abstract: "From neutron-yield measurements made with a MnSO4 detecting solution, the average number of neutrons produced per inelastic event is determined for a series of elements from lithium to uranium for 340-Mev protons, 190-and 315-Mev deuterons, 490-Mev He3 ions, and 90- and 160-Mev neutrons. The results are analyzed in an attempt to understand the total yield measurements for thick targets and to explain the variation of yield with the atomic number of the target."
Date: September 29, 1954
Creator: Crandall, Walter E. & Millburn, George P.
Partner: UNT Libraries Government Documents Department

Track Fitting in an Inhomogeneous Magnetic Field

Description: We describe an efficient method of track fitting for charged particles moving in an arbitrary inhomogeneous magnetic field.The method is a least-squares fit in 3-dimensional space which assumes local field uniformity to approximate the orbit as a set of linked helical segments.We propagate the orbit and error matrix in order to calculate the residuals and their derivatives analytically at the position of the hit wires.The accuracy of the method depends only on the step size of the linked helical segments.The fit converges rapidly to the point of minimum Chi^2; one needs only a few iterations even for poor starting values of track parameters.
Date: May 1, 1991
Creator: Niczyporuk, Bogdan
Partner: UNT Libraries Government Documents Department

International Linear Collider Workshop at Snowmass

Description: This account funding was used to support the American Linear Collider Physics Group (ALCPG) and The International Linear Collider (ILC) Snowmass workshop that took place in August, 2005. The workshop lasted 2 weeks. The funds provided by the DOE ($110 K) were to fund all the computing and secretariat effort of the workshop. This was a very successful workshop as evidenced by the large attendance; about 600 attendees. Some funds were left over ($12,876.89) and the DOE was informed. It is my understanding that this money has been returned.
Date: July 6, 2006
Creator: Nauenberg, Uriel
Partner: UNT Libraries Government Documents Department

The Snowmass points and slopes : benchmarks for SUSY searches.

Description: The ''Snowmass Points and Slopes'' (SPS) are a set of benchmark points and parameter lines in the MSSM parameter space corresponding to different scenarios in the search for Supersymmetry at present and future experiments. This set of benchmarks was agreed upon at the 2001 ''Snowmass Workshop on the Future of Particle Physics'' as a consensus based on different existing proposals.
Date: April 15, 2002
Creator: Allanach, B. C.; Battaglia, M.; Blair, G. A.; Carena, M.; De Roeck, A. & Wagner, C. E. M.
Partner: UNT Libraries Government Documents Department