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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

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

Summary of the particle physics and technology working group

Description: Progress in particle physics has been tightly related to technological advances during the past half century. Progress in technologies has been driven in many cases by the needs of particle physics. Often, these advances have benefited fields beyond particle physics: other scientific fields, medicine, industrial development, and even found commercial applications. The particle physics and technology working group of Snowmass 2001 reviewed leading-edge technologies recently developed or in the need of development for particle physics. The group has identified key areas where technological advances are vital for progress in the field, areas of opportunities where particle physics may play a principle role in fostering progress, and areas where advances in other fields may directly benefit particle physics. The group has also surveyed the technologies specifically developed or enhanced by research in particle physics that benefit other fields and/or society at large.
Date: December 10, 2002
Creator: al., Stephan Lammel et
Partner: UNT Libraries Government Documents Department

Measurement of the K{sup 0}{sub S} - K{sup 0}{sub L} mass difference by the time dependence of strangeness

Description: The magnitude of the K{sup 0}{sub S} - K{sup 0}{sub L} mass difference has been measured by monitoring the time dependence of the strangeness of neutral K's produced in hydrogen and deuterium in the LRL 25 '' hydrogen bubble chamber. The particles originate as K-bar{sup 0} in K{sup -} change-exchange scatters at .85 to 1.15 Bev/c; the signature for an S = -1 reaction is the production of a hyperon. Seventy- seven events were found, obtaining {Delta}{omega} = 0.50 =- 0.15, measured in units of inverse K{sup 0}{sub S} lifetime. This and two other recent measurements using the same method are consistent with one another and with measurements of {Delta}{omega} by other means. A combined ''world average'' of nine reasonably consistent measurements gives {Delta}{omega} = 0.60 +- 0.06.
Date: April 1, 1966
Creator: Camerini, U.; Cline, D.; English, J. B.; Fischbein, W.; Fry, W. F.; Gaidos, J. A. et al.
Partner: UNT Libraries Government Documents Department

Final Report on DOE Grant DE-SC0001075 titled "Supersymmetry and Unification of Fundamental Interactions - SUSY2009

Description: SUSY2009 brought together researchers from a very broad area of fundamental physics including elementary particle theory, astrophysics and cosmology and string theory with a focus on supersymmetry. Thus the topic covered at the SUSY2009 conference included the following: Search for the Higgs boson, search for supersymmetry, supersymmetry phenomenology, theories of dark matter and direct and indirect detection, neutrino physics, accelerator experiments, electroweak physics, supersymmetry phenomenology, string theory, string phenomenology, extra Dimensions as well as other recent theoretical and experimental developments. The conference was successful in fostering interdisciplinary interactions between theorists and experimentalists.
Date: September 12, 2012
Creator: Nath, Pran
Partner: UNT Libraries Government Documents Department