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Title: Murray and the Omega Minus

Abstract

The exciting findings and activities in particle physics in the 50's and 60's will be discussed from an experimentalist's viewpoint. Particular emphasis will be placed on the description of several crucial discoveries (including the omega minus) and on the remarkable insight, guidance, and major contributions of Murray Gell-Mann to the understanding of the symmetry of hadrons which led to the development of the standard model of the strong interactions.

Authors:
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Riken Research Facility
Sponsoring Org.:
DOE - Office Of Science
OSTI Identifier:
992124
Report Number(s):
BNL-94275-2010-JA
R&D Project: PO-3; TRN: US1007684
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Modern Physics; Journal Volume: 25; Journal Issue: 21
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HADRONS; OMEGA PARTICLES; PHYSICS; STANDARD MODEL; STRONG INTERACTIONS; SYMMETRY; riken bnl research center

Citation Formats

Samios, N.P. Murray and the Omega Minus. United States: N. p., 2010. Web. doi:10.1142/S0217751X10050536.
Samios, N.P. Murray and the Omega Minus. United States. doi:10.1142/S0217751X10050536.
Samios, N.P. 2010. "Murray and the Omega Minus". United States. doi:10.1142/S0217751X10050536.
@article{osti_992124,
title = {Murray and the Omega Minus},
author = {Samios, N.P.},
abstractNote = {The exciting findings and activities in particle physics in the 50's and 60's will be discussed from an experimentalist's viewpoint. Particular emphasis will be placed on the description of several crucial discoveries (including the omega minus) and on the remarkable insight, guidance, and major contributions of Murray Gell-Mann to the understanding of the symmetry of hadrons which led to the development of the standard model of the strong interactions.},
doi = {10.1142/S0217751X10050536},
journal = {International Journal of Modern Physics},
number = 21,
volume = 25,
place = {United States},
year = 2010,
month = 8
}
  • This study is based on a subset of events of the type {pi}{sup +}{pi}{sup +}{pi}{sup {minus}}{pi}{sup {minus}}{gamma}{gamma}, from the {pi}{sup {minus}}p interaction in the 1995 run of E852, {ital A Search for Mesons with Unusual Quantum Numbers} at the MPS facility of BNL. The data set is reduced such that it contains events of the type {omega}{pi}{sup {minus}}{pi}{sup +} to be used in the Partial Wave Analysis (PWA) of the system. In the {omega}{pi}{sup {plus_minus}} and the 4{pi} mass spectra, we observe b{sub 1}(1235) and {rho}{sub 3}(1690) signals. In the {pi}{sup {minus}}{pi}{sup +} off of the {omega} we see amore » large contribution due to {rho}(770) followed by a smaller contribution due to f{sub 2}(1270). The b{sub 1}{sup {minus_plus}} production seems to be enhanced for the {omega}{pi}{sup {minus}}{pi}{sup +} mass near 2 GeV, with more b{sub 1}{sup {minus}} produced than b{sub 1}{sup +}. A spin parity analysis of the {omega}{pi}{sup {minus}}{pi}{sup +} system to look for radial excitations and states with exotic quantum numbers is under way. {copyright} {ital 1998 American Institute of Physics.}« less
  • We analyze the possibility that the decay {Omega}{sup {minus}}{r arrow}{Lambda}{ital K}{sup {minus}}{gamma} can be used as an alternative experimental procedure to determine the {Omega}{sup {minus}} magnetic moment. Using the soft-photon approximation we derive a model-independent expression for the angular and energy distribution of photons. We find that this observable is sensitive to the {Omega}{sup {minus}} magnetic moment when photons and kaons are emitted collinearly.
  • Results are presented on a study of resonant structure in the {omega}{eta} and {omega}{pi}{sup 0} final states produced in {pi}{sup {minus}}p interactions at 18thinspGeV/c where {omega}{r_arrow}{pi}{sup +}{pi}{sup {minus}}{pi}{sup 0}, {pi}{sup 0}{r_arrow}2{gamma}, and {eta}{r_arrow}2{gamma}. Final states, such as {omega}{eta} and {omega}{pi}{sup 0}, which contain a vector meson, are allowed in the extended flux-tube model for the decay of hybrid mesons. In the {omega}{pi}{sup 0} final state, the data exhibit the well-known b{sub 1}(1235) and the {rho}{sub 3}(1690) resonances. A one-pion exchange mechanism is clearly seen for the {rho}{sub 3}(1690). A detailed partial wave analysis of both {omega}{eta} and {omega}{pi}{sup 0} ismore » currently in progress. {copyright} {ital 1998 American Institute of Physics.}« less
  • We analyze the frequency-dependent photoinduced infrared conductivity, {sigma}{sub {ital P}}({omega}), obtained from photoinduced absorption measurements of the insulators Tl{sub 2}Ba{sub 2}Ca{sub 0.98}Gd{sub 0.02}Cu{sub 2}O{sub 8}, YBa{sub 2}Cu{sub 3}O{sub 6.3}, and La{sub 2}CuO{sub 4} in terms of {sigma}{sub PT}({omega}) calculated from nonadiabatic polaron-transport theory. The calculated {sigma}{sub PT}({omega}) is in good agreement with the experimental {sigma}{sub {ital P}}({omega}) in the midinfrared. We also compare {sigma}{sub {ital P}}({omega}) with the infrared conductivity, {sigma}({omega}), of the high-{Tc} superconductors Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}, YBa{sub 2}Cu{sub 3}O{sub 7}, and La{sub 1.85}Sr{sub 0.15}CuO{sub 4}. The similar spectral shape and systematic trends in both {sigma}{sub {italmore » P}}({omega}) and {sigma}({omega}) indicate that the carriers in the concentrated (metallic) regime retain much of the character of the carriers in the dilute (photoexcited) regime. Together, these results imply that in the superconducting cuprates and in their parent'' insulators, the carriers are polarons dressed with a phonon polarization cloud.« less
  • Using the vector meson dominance model we get predictions for the Cabibbo-favored {tau}{sup {minus}}{r_arrow}{omega}{pi}{sup {minus}}{nu}{sub {tau}} and {tau}{sup {minus}}{r_arrow}{phi}{pi}{sup {minus}}{nu}{sub {tau}} decays. We show how the measurements of these two decays can provide information on the nature of the violation of the Okubo-Zweig-Iizuka (OZI) rule. {copyright} {ital 1996 The American Physical Society.}