Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........77w&link_type=abstract
Thesis (PH.D.)--VANDERBILT UNIVERSITY, 1987.Source: Dissertation Abstracts International, Volume: 48-09, Section: B, page: 2687
Physics
15
Scientific paper
The purpose of this dissertation is to present evidence for a resonance in an analysis of data obtained by Fermi National Accelerator Laboratory (FNAL) experiment E623. This experiment was performed in the FNAL Multiparticle Spectrometer (MPS) utilizing a 400 GeV/c proton beam on a nuclear target. The MPS for E623 included a hardware trigger designed to enhance the inclusive K^+ K^-K^+K ^- sample, with low K^+ K^- mass to enhance the detection of pairs of phi mesons observed through the phi to K^+ K^- decay. This resonance was observed in the inclusive K ^+K^-K ^+K^-pi^+pi ^- subset of the E623 data, comprising 94,786 triggered events. The K^+K ^-pi^+pi^-^ectrum in these events displayed evidence of resonance production at a mass of 2.363 +/- 0.005 GeV/c ^2, with a measured width of 0.040 +/- 0.015 GeV/c^2. An excess of 1291_sp{-338} {+368} entries over a smooth background was observed. This excess is correlated with high associated particle multiplicity and with high transverse momentum relative to the beam. The additional K^+ K^- pair in the event produces an associated phi in 293 +/- 279 entries. With the phi K^+K^-pi ^+pi^- acceptance of (3.3 +/- 0.4) times 10 ^{-4}, the cross-section of this subset of the observed resonance is sigma( phiX(2.36)) cdot BR(X to K^+K ^-pi^+pi^-) = 1.77 +/- 1/70 mub. No substrates are observed to occur in the K^+ K^-pi^+pi^ -; thus, the parity of the state is (-1) ^{rm J}.. Since the width is consistent with the experimental mass resolution, it can be argued that that state is too narrow to be an ordinary qq meson. The correspondence to the previously uncorroborated result of Oh et al in pp collisions (Phys. Rev. Lett. 24, 1257 (1970)), suggests interpretation as a ssuu exotic meson. However, on the basis of available information, no firm conclusions about the nature of the state can be drawn.
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