Amplitude analysis of the K S 0 K S 0 system produced in the reaction<mml:math xmlns:mml="http://…
1982; American Physical Society; Volume: 25; Issue: 7 Linguagem: Inglês
10.1103/physrevd.25.1786
ISSN1538-4500
AutoresA. Etkin, K. J. Foley, R. S. Longacre, W. A. Love, T. W. Morris, Satoshi Ozaki, E.D. Platner, V. Polychronakos, A.C. Saulys, Y. Teramato, C. D. Wheeler, E. Willen, Kwan Wu Lai, S. J. Lindenbaum, M. A. Kramer, U. Mallik, W. A. Mann, R. Merenyi, J. M. Marraffino, C. E. Roos, M. Webster,
Tópico(s)High-Energy Particle Collisions Research
ResumoWe have carried out an amplitude analysis of the ${K}_{S}^{0}{K}_{S}^{0}$ system produced in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{S}^{0}n$ at 23 GeV/c, based on about 15 000 events in the low-$t$ region ($|t\ensuremath{-}{t}_{min}|<0.1$ Ge${\mathrm{V}}^{2}$). Below 1.6 GeV/${\mathit{c}}^{2}$, our favored solution is very similar to those from previous analyses. For higher masses, we observe the ${K}_{S}^{0}{K}_{S}^{0}$ decay of the $h(2040)$ meson. In addition, the $l=0$ partial wave contains a new state, strongly coupled to ${K}_{S}^{0}{K}_{S}^{0}$, with parameters $M={1.771}_{\ensuremath{-}0.053}^{+0.077}$ GeV/${\mathit{c}}^{2}$ and $\ensuremath{\Gamma}={0.200}_{\ensuremath{-}0.009}^{+0.156}$ GeV/${\mathit{c}}^{2}$. Since this state is most probably $I=0$, we call it the ${S}^{*\ensuremath{'}}(1770)$. We find an $\frac{{f}^{\ensuremath{'}}}{f}$ production ratio of ${0.23}_{\ensuremath{-}0.13}^{+0.14}$, and branching ratios for $f$-meson and $h(2040)$-meson decays into $K\overline{K}$ of (${3.1}_{\ensuremath{-}1.7}^{+0.7}$)% and (${0.67}_{\ensuremath{-}0.15}^{+0.41}$)%, respectively. We find, in a detailed comparison of our results with those from other experiments, that our solution is compatible with all known features of both charged and neutral $K\overline{K}$ systems.
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