119241437
Index computation for 3d Chern-Simons matter theory: test of Seiberg-like duality
We work out the superconformal index for $$ \mathcal{N} = 2 $$ supersymmetric Chern-Simons matter theories exhibiting Seiberg-like dualities proposed by Giveon and Kutasov. We consider U(N)/Sp(2N)/O(N) gauge theories of QCD type and find the perfect agreements for proposed dual pairs.
119106630
Evidence for Aharony duality for orthogonal gauge groups
We study the Aharony duality for three dimensional $ \mathcal{N} = 2 $ supersymmetric gauge theories for orthogonal gauge groups with matters in vector representation. We provide the evidence for the duality by working out the partition function on S3 and the superconformal index, which show perfect agreement.
6684532
The upgrade of SRRC booster extraction system
It is planned to upgrade the SRRC booster from 1.3 GeV to 1.5 GeV for full energy injection into the storage ring before the end of 1999. Based on the technical specification and operation experience, it is concluded that some of the subsystem components need to be rebuilt, such as the magnet power supply systems and beam extraction elements. A review of the power supply system will be reported elsewhere. In this report, the brief review of the beam extraction process is given according to the 1.5 GeV parameters. The test result of a modified kicker magnet is presented.
117250608
Study of rare $B^+_{c} \to D_{d,s}$ + lepton anti-lepton decays
We study the rare decays of $B_c^+\to D_{q}^{(*)+}l\bar{l}$ ($q=d,s$ and $l=\nu_l,e,\mu,\tau)$ in the standard model. The form factors are evaluated in the light front and constituent quark models, respectively. We find that the decay branching ratios calculated in the two models for $B_c^+\to D^+_q l\bar{l}$ agree well with each other, whereas those for $B_c^+\to D_q^{*+}l\bar{l}$ are different.
17389081
Lepton pair decays of the K L meson in the light-front model
We analyze ${K}_{L}$ lepton pair decays of ${K}_{L}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}\ensuremath{\gamma}$ and ${K}_{L}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}{l}^{\ensuremath{'}+}{l}^{\ensuremath{'}\ensuremath{-}}(l,{l}^{\ensuremath{'}}=e,\ensuremath{\mu})$ within the framework of the light-front QCD approach (LFQA). With the ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\gamma}}^{*}{\ensuremath{\gamma}}^{*}$ form factors evaluated in a model with the LFQA, we calculate the decay branching ratios and find that our results are all consistent with the experimental data. In addition, we study ${K}_{L}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}$ decays. We point out that our prediction for ${K}_{L}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ is about $20%$ smaller than that in chiral perturbation theory. We also discuss whether one could extract the short-distance physics from ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}.$
55434342
IN-ACHROMATIC SUPERCONDUCTING WIGGLER IN TAIWAN LIGHT SOURCE: INSTALLATION AND TEST RESULTS
A 16-pole in-achromatic superconducting wiggler (IASW) has been installed and operated in the achromatic section of a 1.5 GeV storage ring to increase the generation of high flux X-ray photon beams for Taiwan Light Source (TLS), The 3.1 Tesla superconducting wiggler is operated in a 4.5-K liquid helium cryogenic system. This work describes the operation experience and test results of the in-achromatic superconducting wiggler.
119193692
Meson distribution amplitudes in holographic models
We study the wave functions of light and heavy mesons in both hard-wall (HW) and soft-wall (SW) holographic models which use AdS/CFT correspondence. In the case of massless constituents, the asymptotic behaviors of the electromagnetic form factor, the distribution amplitudes, and the decay constants for the two models are the same, if the relation between the dilaton scale parameter and the size of meson is an inverse proportion. On the other hand, by introducing a quark mass dependence in the wave function, the differences of the distribution amplitudes between the two models are obvious. In addition, for the SW model, the dependences of the decay constants of meson on the dilaton scale parameter $\kappa$ differ; especially f_{Qq}\sim \kappa^3/m_Q^2 is consistent with the prediction of the heavy quark effective theory if \kappa\sim m_Q^{1/2}. Thus the parameters of the two models are fit by the decay constants of the distinct mesons; the distribution amplitudes and the \xi-moments are calculated and compared.