28 Matching Results

Search Results

Advanced search parameters have been applied.

Resonances in high-energy colliding lepton beams

Description: The search for the correct higher symmetry of decay vertices is discussed. It is noted that something higher than SU(3) is certainly valid and colliding lepton beams can help find what it is. SU(6(/sub W/ and its limitations, L = 1, 2 mesons, and the two-photon processes e/sup +/ + e/sup -/ yields e/sup +/ + e/sup -/ + hadrons, and e/sup -/ + e/sup -/ yields e/sup -/ + e/sup -/ + hadrons are considered. (JFP)
Date: March 13, 1973
Creator: Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Charmed particle lifetimes. [Review, six quark model]

Description: Conventional estimates are reviewed for charmed particle lifetimes. Free-quark models give values of (a few) x 10/sup -13/ sec to (a few) x 10/sup -12/ sec. The shorter of these values also follows from an extrapolation based on D ..-->.. Ke/sup nu/. Possible differences among the lifetimes and production rates of D/sup 0/, D/sup +/, F/sup +/, C/sub 0//sup +/, the heavy lepton tau, and the fifth quark b are discussed. Extreme values of mixing angles in a six-quark model could extend charmed particle lifetimes by a factor of at most three from the above estimates, while shorter lifetimes than those predicted could occur for some species like D/sup 0/ or F/sup +/ if their nonleptonic decays were enhanced. The predictions are discussed in the light of some current experimental results, and it is estimated that sigma(pp ..-->.. charm) approx. = 10 ..mu..b at 400 GeV/c. 95 references.
Date: January 1, 1979
Creator: Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Heavy quarks and new particles

Description: Some aspects of particles containing c, b, and heavier quarks are reviewed. It is shown how these particles can provide tests of the short-range nature of the strong interactions, and how elementary quantum mechanics can reveal the color and charge of the constituents and the number of states below flavor threshold. Some new results are presented on the inverse problem for confining potentials. Properties of flavored hadrons (masses and lifetimes), of gluonic bound states, and of particles containing very heavy objects are also discussed.
Date: January 1, 1979
Creator: Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Quantum mechanics with applications to quarkonium. [Review, WKB approximation, scale invariance]

Description: Some methods of nonrelativistic quantum mechanics which are particularly useful for studying the variation of bound-state parameters with constituent mass and excitation energy are reviewed. These techniques rely upon elementary scaling arguments and on the semiclassical (WKB) approximation. They are of general interest, but are applied here to the study of bound systems of a heavy quark and antiquark. Properties of the interquark interaction are extracted from information about masses and leptonic widths of the Psi and T families. It is shown how general methods can be applied to the determination of the electric charge of quarks and to the prediction of properties of new families. 113 references.
Date: February 1, 1979
Creator: Quigg, C. & Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Minimally extended elctroweak gauge theories in SO(10) and E/sub 6/

Description: The possibility of minimally extending the standard SU(2)/sub L/xU(1) electroweak theory within the context of SO(10) and E/sub 6/ grand unification by adding U(1) factors is explored. The neutrino neutral-current interactions in these schemes are arranged to coincide with the standard-model predictions. Limits on the masses of the extra Z's generated by these U(1) factors are obtained by considering other parity-violating effects. Additional Z's as light as 2.5 to 3.0 times the standard model Z/sup 0/ mass are allowed.
Date: November 1, 1982
Creator: Robinett, R.W. & Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Current quarks, constituent quarks, and symmetries of resonance decays

Description: The transformation between ''current'' quarks and ''constituent'' quarks recently suggested by Melosh is examined with respect to its predictions for pionic decays of resonances. It implies the use of SU(6)/sub W/ for classifying particle states but not for describing decay processes. lnstead, pion emission proceeds via DELTA L/sub z/ = 0, plus or minus 1, where L is the internal (''quark'') orbital angular momentum. This decay symmetry is called SU(6)/sub W/ (DELTA L/sub z/ = 0, plus or minus 1). It is proven equivalent for any decay A yields B + pi (where A, B are arbitrary qq-bar or qqq hadrons) to the /sup 3/P/sub 0/ quark-pair creation model for such decays, as formulated by Micu, Colglazier, Petersen and Rosner. The roles of final orbital angular momenta l and of SU(3) x SU(3) subgroups of SU(6)w are also discussed, and some new predictions are made for decays of meson resonances below 1700 MeV. (auth)
Date: April 18, 1973
Creator: Hey, A.J.G.; Rosner, J.L. & Weyers, J.
Partner: UNT Libraries Government Documents Department

New particles, theoretical. [Review]

Description: This report is the written summary of papers presented in Parallel Session B8 at the XIXth International Conference on High Energy Physics, August 24 to 30, 1978, Tokyo, Japan. The work of the minirapporteur was divided three ways: Q anti Q interaction and charmonium (Jackson), implications of the upsilon states (Rosner), and weak decays of heavy quarks (Quigg). 162 references.
Date: September 1, 1978
Creator: Jackson, J.D.; Quigg, C. & Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Inverse scattering problem for quarkonium systems. I. One-dimensional formalism and methodology. [bound state, algebraic technique]

Description: The inverse scattering formalism for reflectionless potentials is applied to the reconstruction of confining potentials from bound-state properties. An explicit algebraic technique is presented and tested on several one-dimensional examples. The connection with a classical problem of interacting solitons is exhibited. 27 references.
Date: December 1, 1977
Creator: Thacker, H.B.; Quigg, C. & Rosner, J.L.
Partner: UNT Libraries Government Documents Department

Determining the fifth quark's charge: the role of T leptonic widths. [Lower bounds]

Description: Lower bounds on the leptonic decay widths of T(9.4) and T'(10.0) are deduced from plausible general assumptions. It is shown that these may permit a distinction between the charge assignments e/sub Q/ = (-1/3, +2/3) for the new quark.
Date: February 1, 1978
Creator: Rosner, J.L.; Quigg, C. & Thacker, H.B.
Partner: UNT Libraries Government Documents Department

Forward-backward asymmetries in W and Z decays

Description: The leptons emitted in decays of W and Z bosons produced in pp or anti pp collisions exhibit characteristic asymmetries with respect to the beam direction, as measured in the W or Z center-of-mass. The asymmetries appear in both pp and anti pp collisions. For anti pp collisions they appear to be approximately constant over the whole y range for values of M/..sqrt..s greater than or equal to 0.1. For smaller values of M/..sqrt..s, the asymmetries become more and more washed out in the central region as sea-sea collisions begin to play a larger role in gauge boson formation.
Date: February 13, 1984
Creator: Rosner, J.L.; Langacker, P. & Robinett, R.W.
Partner: UNT Libraries Government Documents Department