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.

Neutral pion and η meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

Abstract: Neutral pion and η meson production in the transverse momentum range 1

Search for a Low Mass Particle Decaying into mu(+)mu(-) in B(0)-> K*(0)X and B(0)->rho(0)X at Belle

Abstract: We search for dimuon decays of a low mass particle in the decays B-0 -> K*X-0 and B-0 -> rho X-0 using a data sample of 657 x 10(6)B (B) over bar events collected with the Belle detector at the KEKB asymmetric- energy e(+)e(-) collider. We find no evidence for such a particle in the mass range from 212 MeV/c(2) to 300 MeV/c(2) for lifetimes below 10(-12) s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214: 3 MeV/c(2) reported by the HyperCP experiment, and obtain upper limits on the products B(B-0 -> K*X-0) x B(X mu(+)mu(-)) rho X-0) x B(X -> mu(+)mu(-)) < 1.73(1.73) x 10(-8) at 90% C.L. for a scalar (vector) X particle.

Study of B0 →ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state

Abstract: We present a study of the branching fraction of the decay B-0 -> rho(0)rho(0) and the fraction of longitudinally polarized rho(0) mesons in this decay. The results are obtained from the final data sample containing 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We find 166 +/- 59 B-0 -> rho(0)rho(0) events (including systematic uncertainties), corresponding to a branching fraction of B(B-0 -> rho(0)rho(0)) = (1.02 +/- 0.30(stat) +/- 0.15(syst)) x 10(-6) with a significance of 3.4 standard deviations and a longitudinal polarization fraction f(L) = 0.21(-0.22)(+0.18()stat) +/- 0.15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle phi(2) = (84.9 +/- 13.5)degrees through an isospin analysis in the B ->rho rho system. We furthermore find 125 +/- 41 B-0 -> f(0)rho(0) events, corresponding to B(B-0 -> f(0)rho(0)) x B(f(0) -> pi(+)pi(-)) = (0.78 +/- 0.22(stat) +/- 0.11(syst)) x 10(-6), with a significance of 3.1 standard deviations. We find no other significant contribution with the same final state, and set upper limits at 90% confidence level on the (product) branching fractions, B(B-0 -> pi(+)pi(-)pi(+)pi(-)) rho(0)pi(+)pi(-)) f(0)pi(+)pi(-)) x B(f(0) -> pi(+)pi(-)) f(0)f(0)) x B(f(0) -> pi(+)pi(-))(2) < 0.2 x 10(-6).