Search for a J/psi eta resonance in B+- to J/psi eta K+- decay at Belle

We report study of B+- to J/psi eta K+- decays at Belle. In this analysis we search for X(3872) as well as other narrow resonances in the J/psi eta final state.Comment: Presented at The 5th International Workshop on Charm Physics (Charm2012) 14-17 May 2012, Honolulu, Hawai'i 9682

DFQ--Double Frequency RFQ

RFQ with a harmonic higher order quadrupole mode is studied. Assuming that we superpose a higher order mode with twice the frequency of the fundamental mode, a sawtooth waveform is approximated. In such a case, the bunching function is enhanced while the transverse stability is modified. Second order longitudinal harmonic component is also required to enable the effect.Comment: Linac200 oral poster MOE20, PS file, MSWORD 5.1

Recent results from K2K

Results from K2K-I and status of K2K-II (run after the SK accident in November 2001) was reported. The results from K2K-I are the $\nu_{\mu}$ disappearance, $\nu_e$ appearance, and studies of neutrino interaction with water nuclei. For K2K-II, steady increase of POT (number of Protons On Target) and number SK events are shown. Also, a new front detector SciBar was installed from K2K-II.Comment: Proceedings for the XXXIXth Rencontres de Moriond session devoted to Electroweak Interactions and Unified Theorie

Gravitational collapse disturbs the dS/CFT correspondence?

We study the gravitational collapse in five-dimensional de Sitter (dS) spacetime and discuss the existence of the conformal boundaries at future timelike infinity from the perspective of the dS/CFT correspondence. We investigate the motion of a spherical dust shell and the black hole area bounds. The latter includes the analysis of the trapping horizon and the initial data with spindle-shaped matter distribution. In all above analyses we find the evidences that guarantee the existence of the conformal boundaries at future timelike infinity which are essential to apply the dS/CFT correspondence.Comment: 7 pages, 6 figure

RF field-attenuation formulae for the multilayer coating model

Formulae that describe the RF electromagnetic field attenuation for the multilayer coating model with a single superconductor layer and a single insulator layer deposited on a bulk superconductor are derived from a rigorous calculation with the Maxwell equations and the London equation.Comment: 3 pages, the 4th International Particle Accelerator Conference (IPAC13), Shanghai, China, 12-17 May, 201

Radio-frequency electromagnetic field and vortex penetration in multilayered superconductors

A multilayered structure with a single superconductor layer and a single insulator layer formed on a bulk superconductor is studied. General formulae for the vortex-penetration field of the superconductor layer and the magnetic field on the bulk superconductor, which is shielded by the superconductor and insulator layers, are derived with a rigorous calculation of the magnetic field attenuation in the multilayered structure. The achievable peak surface field depends on the thickness and its material of the superconductor layer, the thickness of the insulator layer and material of the bulk superconductor. The calculation shows a good agreement with an experimental result. A combination of the thicknesses of superconductor and insulator layers to enhance the field limit can be given by the formulae for any given materials.Comment: 4 pages, 4 figures; figure and table are added, discussions extended, references added, to appear in Applied Physics Letter

Integer Multiplier for Orbital Angular Momentum of Light using Circular-Sector Transformation

This paper describes an integer multiplier for the orbital angular momentum (OAM) of light through the parallel implementation of multiple circular-sector transformations, whereby the cross-sectional circular shape of the OAM mode is geometrically transformed to the circular-sector shape. Experiments show that the conversion accuracy of both OAM doubler and tripler formulations is significantly better than that of the previous method. This is because the proposed method uses a simple implementation with a single spatial light modulator. The proposed method has strong potential for the spatial mode manipulation of OAM and other useful spatial modes.Comment: 5 pages, 6 figure

Review of the multilayer coating model

The recent theoretical study on the multilayer-coating model published in Applied Physics Letters [1] is reviewed. Magnetic-field attenuation behavior in a multilayer coating model is different from a semi-infinite superconductor and a superconducting thin film. This difference causes that of the vortex-penetration field at which the Bean-Livingston surface barrier disappears. A material with smaller penetration depth, such as a pure Nb, is preferable as the substrate for pushing up the vortex-penetration field of the superconductor layer. The field limit of the whole structure of the multilayer coating model is limited not only by the vortex-penetration field of the superconductor layer, but also by that of the substrate. Appropriate thicknesses of superconductor and insulator layers can be extracted from contour plots of the field limit of the multilayer coating model given in Ref.[1].Comment: 3 pages, 3 figures, the 5th International Particle Accelerator Conference (IPAC14), Dresden, Germany, 15-20 June, 201

Elementary excitations and crossover phenomenon in liquids

The elementary excitations of vibration in solids are phonons. But in liquids phonons are extremely short-lived and marginalized. In this letter through classical and ab-initio molecular dynamics simulations of the liquid state of various metallic systems we show that different excitations, the local configurational excitations in the atomic connectivity network, are the elementary excitations in high temperature metallic liquids. We also demonstrate that the competition between the configurational excitations and phonons determines the so-called crossover phenomenon in liquids. These discoveries open the way to the explanation of various complex phenomena in liquids, such as fragility and the rapid increase in viscosity toward the glass transition, in terms of these excitations

Two-loop corrections to partition function of Pohlmeyer-reduced theory for AdS_5 x S^5 superstring

Pohlmeyer reduction of AdS_5 x S^5 superstring leads to a set of equations of motion following from an action containing a bosonic Sp(2,2) x Sp(4)/[SU(2)]^4 gauged WZW term, an integrable potential and a fermionic part coupling bosons from the two factors. The original superstring and the reduced model are in direct correspondence at the classical level but their relation at the quantum level remains an open question. As was found earlier, the one-loop partition functions of the two theories computed on the respective classical backgrounds match; here we explore the fate of this relation at the two-loop level. We consider the example of the reduced theory solution corresponding to the long folded spinning string in AdS. The logarithm of the AdS_5 x S^5 superstring partition function computed on the spinning string background is known to be proportional to the universal scaling function which depends on the string tension ~ \l^{1/2} where \l=\lambda is `t Hooft coupling. Its "quantum" part is f(\l) = a1 + \l^{-1/2} a2 + ... where the one-loop term is a1 = - 3 \ln 2 and the two-loop term is minus the Catalan's constant, a2=-K. We find that the counterpart of f(\l) in the reduced theory is f'(k) =a1' + 2 k^{-1} a2' + ..., where k is the coupling of the reduced theory. Here the one-loop coefficient is the same as in the string theory, a1'= a1, while the two-loop one is a2' =a2 - 1/4 (a1)^2. Remarkably, the first Catalan's constant term here matches the string theory result if we identify the two couplings as k= 2\l^{1/2}. Nevertheless, the presence of the additional (a1)^2 ~ (\ln 2)^2 term implies that a relation between the two quantum partition functions (if any) is not a simple equality. Similar results are found in the case of AdS_3 x S^3 superstring theory where a1= - 2 \ln 2 and a2=0, while in the corresponding reduced theory a1'=a1, a2'= a2- 1/4 (a1)^2.Comment: 36 pages, 4 figure