14082825
350 μm Observations of Local Luminous Infrared Galaxies and the Temperature Dependence of the Emissivity Index
We report 350 μm observations of 18 nearby luminous infrared galaxies (LIRGs) using the Submillimeter High Angular Resolution Camera II (SHARC-II) mounted on the Caltech Submillimeter Observatory (CSO) 10.4 m telescope. Combining our 350 μm flux measurements with the existing far-infrared (FIR) and submillimeter data, we fit a single-temperature model to the spectral energy distributions (SEDs) and find the dust temperatures, emissivity indices, and FIR luminosities having sample medians of T_d = 39.4 ± 7.9 K, β = 1.6 ± 0.3, and LFIR = 10^(11.2±0.6) L⊙. An empirical inverse T_d-β correlation, best described by T_d = (9.86 × 10^9)^(1/(4.63 + β)), is established for the local LIRG sample, which we argue can be explained by the intrinsic interdependence between the dust temperature and grain emissivity index as physical parameters, as well as variations in grain properties in the interstellar medium (ISM).
122191513
Unconventional Geometric Quantum Gate in Circuit QED
We propose a scheme to implement an unconventional geometric phase gate in circuit QED, i.e. two superconducting charge qubits inside a superconducting transmission line resonator. The quantum operation depends only on global geometric features, and thus is insensitive to the state of the cavity mode.
121541983
Designs and measurements of gradient dipole magnets for the upgrade of Pohang Light Source
Abstract The compact size of the upgrade of Pohang Light Source (PLS-II) ring implies the use of gradient dipole magnets, with high field quality requirements. The PLS-II ring contains 24 such dipoles. Detailed 2D and 3D physical designs are reported; they include conformal mapping, equivalent 2D compact factor, residues fitting technique and end chamfer in a concise straight line style. According to the field measurement results, a beam based alignment technique for the rms variation reduction was employed. With that, the uniformities for these dipoles can be reduced to less than 2.0E−04, and the rms variation from dipole to dipole can reach 5.82E-04.
119388505
Sudakov effects in BBNS approach
The end-point singularity is an unsolved problem in BBNS approach, Incorporating the partonic transverse momentum and the Sudakov form factor, this problem can be solved model-independently. We discuss the Sudakov effects in BBNS approach. The BBNS approach is compared with the modified PQCD approach. The main idea of Sudakov form factor is briefly discussed. Our conclusion is that the twist-3 contribution for the hard spectator scattering is numerically not important in B --> pi pi decays, compared with the twist-2 contribution. (C) 2001 Published by Elsevier Science B.V.
204015985
Semileptonic decay of B and D ---> K*0 (1430) anti-l nu from QCD sum rule
We calculate B-(s) and D-(s) to K-0(*)(1430) transition form factors, and study semileptonic decays of B-(s) and D-(s)-> K-0(*)(1430)(l) over bar nu based on QCD sum rule. Measuring these semileptonic decays with high statistics will give valuable information on the nature of light scalar mesons.
16367444
Electroweak penguin effects in some Bs0 two-body decays
Using the next-to-leading order low energy effective Hamiltonian for Delta B = 1 transitions, the effects of electroweak penguin operators in some two-body decay modes of B-s(0) meson are estimated in the Standard Model (SM). We find that in B-s(0) --> pi(+)K(-) and B-s(0) --> K+K- decay modes, the electroweak penguin effects are small, while in B-s(0) --> pi(0)((K) over bar(0)), phi (K) over bar->(0), phi phi, the electroweak penguin operators enhance or reduce the pure QCD penguin and tree level contributions by 20%-80% in decay width. We also present the results of CP asymmetries in these B-s(0) decay modes.
119292653
Wave functions and decay constants of B and D mesons in the relativistic potential model
With the decay constants of D and Ds mesons measured in experiment recently, we revisit the study of the bound states of quark and antiquark in B and D mesons in the relativistic potential model. The relativistic bound state wave equation is solved numerically. The masses, decay constants and wave functions of B and D mesons are obtained. Both the masses and decay constants obtained here can be seen as consistent with the experimental data. The wave functions can be used in the study of B and D meson decays.
116060100
The Decay of the Z boson into three photons via W boson loops