Korea Institute of Science and Technology Information

About: Korea Institute of Science and Technology Information is a facility organization based out in Daejeon, South Korea. It is known for research contribution in the topics: Gravitational wave & LIGO. The organization has 1152 authors who have published 2319 publications receiving 93849 citations. The organization is also known as: Korea Institute of Science and Technology Information & KISTI.

Observation of ψ(4040) and ψ(4160) decay into ηJ/ψ

Abstract: The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi}$ between $\sqrt{s}=3.8\text{ }\text{ }\mathrm{GeV}$ and 5.3 GeV is measured via initial state radiation using $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data on and around the $\ensuremath{\Upsilon}(nS)(n=1,2,3,4,5)$ resonances collected with the Belle detector at KEKB. Two resonant structures at the $\ensuremath{\psi}(4040)$ and $\ensuremath{\psi}(4160)$ are observed in the $\ensuremath{\eta}J/\ensuremath{\psi}$ invariant mass distribution. Fitting the mass spectrum with the coherent sum of two Breit-Wigner functions, one obtains $\mathcal{B}(\ensuremath{\psi}(4040)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4040)}=(4.8\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}1.5)\text{ }\text{ }\mathrm{eV}$ and $\mathcal{B}(\ensuremath{\psi}(4160)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4160)}=(4.0\ifmmode\pm\else\textpm\fi{}0.8\ifmmode\pm\else\textpm\fi{}1.4)\text{ }\text{ }\mathrm{eV}$ for one solution and $\mathcal{B}(\ensuremath{\psi}(4040)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4040)}=(11.2\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}2.1)\text{ }\text{ }\mathrm{eV}$ and $\mathcal{B}(\ensuremath{\psi}(4160)\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi})\ifmmode\cdot\else\textperiodcentered\fi{}{\ensuremath{\Gamma}}_{{e}^{+}{e}^{\ensuremath{-}}}^{\ensuremath{\psi}(4160)}=(13.8\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}2.1)\text{ }\text{ }\mathrm{eV}$ for the other solution, where the first errors are statistical and the second are systematic. This is the first measurement of this hadronic transition mode of these two states, and the partial widths to $\ensuremath{\eta}J/\ensuremath{\psi}$ are found to be about 1 MeV. There is no evidence for the $Y(4260)$, $Y(4360)$, $\ensuremath{\psi}(4415)$, or $Y(4660)$ in the $\ensuremath{\eta}J/\ensuremath{\psi}$ final state, and upper limits of their production rates in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation are determined.

First Observation of an Attractive Interaction between a Proton and a Cascade Baryon

Abstract: This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Ξ-. The result is extracted from two-particle correlations of combined p-Ξ-⊕p¯-Ξ¯+ pairs measured in p-Pb collisions at sNN=5.02 TeV at the LHC with ALICE. The measured correlation function is compared with the prediction obtained assuming only an attractive Coulomb interaction and a standard deviation in the range [3.6, 5.3] is found. Since the measured p-Ξ-⊕p¯-Ξ¯+ correlation is significantly enhanced with respect to the Coulomb prediction, the presence of an additional, strong, attractive interaction is evident. The data are compatible with recent lattice calculations by the HAL-QCD Collaboration, with a standard deviation in the range [1.8, 3.7]. The lattice potential predicts a shallow repulsive Ξ- interaction within pure neutron matter and this implies stiffer equations of state for neutron-rich matter including hyperons. Implications of the strong interaction for the modeling of neutron stars are discussed.

Search for gravitational waves from intermediate mass binary black holes

Abstract: We present the results of a weakly modeled burst search for gravitational waves from mergers of non-spinning intermediate mass black holes (IMBH) in the total mass range 100--450 solar masses and with the component mass ratios between 1:1 and 4:1. The search was conducted on data collected by the LIGO and Virgo detectors between November of 2005 and October of 2007. No plausible signals were observed by the search which constrains the astrophysical rates of the IMBH mergers as a function of the component masses. In the most efficiently detected bin centered on 88+88 solar masses, for non-spinning sources, the rate density upper limit is 0.13 per Mpc^3 per Myr at the 90% confidence level.

Search for an H-Dibaryon with a Mass near 2mΛ in Υ(1S) and Υ(2S) Decays

Abstract: We report the results of a high-statistics search for $H$ dibaryon production in inclusive $\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(2S)$ decays. No indication of an $H$ dibaryon with a mass near the ${M}_{H}=2{m}_{\ensuremath{\Lambda}}$ threshold is seen in either the $H\ensuremath{\rightarrow}\ensuremath{\Lambda}p{\ensuremath{\pi}}^{\ensuremath{-}}$ or $\ensuremath{\Lambda}\ensuremath{\Lambda}$ decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive $\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(2S)$ decays to antideuterons. Since $\ensuremath{\Upsilon}(1S,2S)$ decays produce flavor-$SU(3)$-symmetric final states, these results put stringent constraints on $H$ dibaryon properties. The results are based on analyses of 102 million $\ensuremath{\Upsilon}(1S)$ and 158 million $\ensuremath{\Upsilon}(2S)$ events collected with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider.