18 Matching Results

Search Results

Advanced search parameters have been applied.

Simplifying Multi-Jet QCD Computation

Description: These lectures give a pedagogical discussion of the computation of QCD tree amplitudes for collider physics. The tools reviewed are spinor products, color ordering, MHV amplitudes, and the Britto-Cachazo-Feng-Witten recursion formula.
Date: November 4, 2011
Creator: Peskin, Michael E.
Partner: UNT Libraries Government Documents Department

Lepton nucleon scattering

Description: The topic of lepton-nucleon inclusive scattering is reviewed. Some of the experiments providing data on these interactions are described first. Then the constituent model of the nucleon and the contribution of various types of experiments are discussed; data from the experiments are compared and some simple predictions of the quark model are covered. Next, some of the fundamental notions behind quantum chromodynamics (QCD) are presented. Subsequent sections examine detailed tests of QCD. These include the ratio of longitudinal to transverse photoabsorption cross sections, the proton form factor in elastic ep scattering, and the dependence of structure functions on Q/sup 2/. In conclusion, all the tests of QCD are tabulated, and the results are evaluated. 32 references, 33 figures, 4 tables. (RWR)
Date: November 1, 1979
Creator: Atwood, W. B.
Partner: UNT Libraries Government Documents Department

Degradation of transuranic-contaminated wastes under geologic isolation conditions

Description: An extensive experimental study of the degradation of existing forms of defense-related, transuranic-contaminated (TRU) wastes is being conducted by and for Sandia Laboratories. Studies have been performed under environmental conditions expected for deep geologic isolation in the Waste Isolation Pilot Plant (WIPP), a bedded-salt TRU waste repository planned for southeastern New Mexico. A primary purpose of this program has been to support the US Department of Energy in establishing waste acceptance criteria for TRU wastes for isolation in the WIPP. TRU waste forms investigated include cellulosics (paper, rags, wood), plastics, rubbers, mixed organic composite, bitumen, a developmental concrete-TRU ash matrix, mild steel, and inorganic process sludges. This review includes laboratory and field results for waste degradation under a range of conditions, resultant gas generation rates, gas compositions, corrosion rates, and microbial formation and degradation of chelating agents.
Date: November 1, 1979
Creator: Molecke, M.A.
Partner: UNT Libraries Government Documents Department

Review of meson spectroscopy: quark states and glueballs

Description: A group of three lectures on hadron spectroscopy are presented. Topics covered include: light L = 0 mesons, light L = 1 mesons, antiquark antiquark quark quark exotics, a catalogue of higher quark antiquark excitations, heavy quarkonium, and glueballs. (GHT)
Date: November 1, 1981
Creator: Chanowitz, M.S.
Partner: UNT Libraries Government Documents Department

Heavy lepton phenomenology. [Lectures]

Description: An empirical definition of a charged lepton is presented using the properties of the electron and muon. For this purpose the evidence is surveyed that the electron and muon are elementary particles without constituents. Some of the evidence is discussed that these particles do not partake of the strong interactions. A similarly empirical discussion is given of neutrinos. Only enough theory is given to provide a basis for the discussion of the tau lepton, for which the properties and areas for future research are considered. Finally, limits are reviewed from past searches on the existence of other types of heavy leptons, and the extensions of such searches are discussed. 72 references.
Date: November 1, 1978
Creator: Perl, M.L.
Partner: UNT Libraries Government Documents Department

The new ether

Description: The Standard Model of elementary particles and forces is reviewed briefly, followed by a discussion of the connection of the Standard Model with the early universe as described by the ''big bang.'' The emerging importance of the vacuum state is then highlighted. The highest energies of the earliest times are discussed, followed by the electroweak phase transition, freeze-outs of unstable particles, the confining phase transition, and the emergence of baryons. Implications of this kind of history of the universe are then discussed. The complexity of the vacuum state is finally described. 9 refs. (LEW)
Date: November 1, 1985
Creator: Bjorken, J.D.
Partner: UNT Libraries Government Documents Department

QCD, unification and the road to asymptopia

Description: Attempts to describe interactions at extremely high energies are addressed. Previous beliefs that asymptopia - the theoretically promised land where all asymptotic theorems come true - was reached have always proven false. Present estimates of asymptopia range from 10/sup 5/ GeV to 10/sup 16/ GeV. In the author's opinion it is premature to believe that the universe is described by a hierarchy of nested gauge groups. The establishment of QCD as the nonabelian gauge group describing strong interactions has not yet been accomplished. 2 figures. (RWR)
Date: November 1, 1980
Creator: Lindenbaum, S.J.
Partner: UNT Libraries Government Documents Department

Weak decays. [Lectures, phenomenology]

Description: Lectures are given on weak decays from a phenomenological point of view, emphasizing new results and ideas and the relation of recent results to the new standard theoretical model. The general framework within which the weak decay is viewed and relevant fundamental questions, weak decays of noncharmed hadrons, decays of muons and the tau, and the decays of charmed particles are covered. Limitation is made to the discussion of those topics that either have received recent experimental attention or are relevant to the new physics. (JFP) 178 references
Date: November 1, 1978
Creator: Wojcicki, S.
Partner: UNT Libraries Government Documents Department