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[en] We have observed the production of a new scalar meson of mass 1255 +- 5 MeV and width 79 +- 10 MeV. The meson is observed primarily through the interference of the S-wave and D-wave K/sub s/0K/sub s/0 production amplitudes in the reaction π-p→nK/subs/0K/subs/0 at 6 and 7 GeV/c. The S-wave amplitude and phase are both observed to have Breit--Wigner behavior. The quantum numbers of the meson are J/sup P/=0+ and C=+1 with I/sup G/=1- preferred
[en] We performed a search for the decay KL0→3γ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of KL0→3γ proceeding via parity-violation, we obtained the single event sensitivity to be (3.23±0.14)x10-8, and set an upper limit on the branching ratio to be 7.4x10-8 at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of KL0→3γ proceeding via parity-conservation were also presented in this paper.
[en] The phiphi parity test is generalized to any specific X→V1V2 decay mode where the vector mesons V1 and V2 each either decays into two spin-zero bosons, or is ω. From a V1V2 mode with a V1bold-arrow-left-rightV2 exchange property, the parity eta of X can always be determined as can (-)/sup J/ of X except in certain circumstances. For modes without such an exchange property, eta(-)/sup J/ can be determined provided certain amplitudes do not accidentally vanish. Empirical tests for unexpected violations of V1bold-arrow-left-rightV2 exchange properties are enumerated
[en] R-parity conservation is an ad hoc assumption in the most popular version of the supersymmetric standard model. Most studies of models which do allow for R-parity violation have been restricted to various limiting scenarios. The single-VEV parametrization used in this paper provides a workable framework to analyze phenomenology of the most general theory of SUSY without R parity. We perform a comprehensive study of leptonic phenomenology at the tree level. Experimental constraints on various processes are studied individually and then combined to yield regions of admissible parameter space. In particular, we show that large R-parity violating bilinear couplings are not ruled out, especially for large tan β. (c) 2000 The American Physical Society
[en] The q-difference Painlevé II equation admits special solutions written in terms of determinants whose entries are the general solution of the q-Airy equation. An ultradiscrete limit of the special solutions is studied using the procedure of ultradiscretization with parity variables. Then we obtain new Airy-type solutions of the ultradiscrete Painlevé II equation with parity variables, and the solutions have a richer structure than the known solutions. (paper)