118557184
Strong and radiative decays of heavy mesons in a covariant model
A bstractIn this paper, we investigate symmetry breaking effects in strong and radiative decays of heavy mesons. We study 1/mQ corrections within the heavy quark effective theory. These effects are studied in a covariant model for heavy mesons. The numerical results are consistent with the experimental data and some other theoretical calculations. These provide a vote of confidence for the validity of this covariant model.
12196534
Mesonic form factors and the Isgur-Wise function on the light front
Within the light-front framework, form factors for P{r_arrow}P and P{r_arrow}V transitions (P denotes a pseudoscalar meson, V a vector meson) due to the valence-quark configuration are calculated directly in the entire physical range of momentum transfer. The behavior of the form factors in the infinite quark mass limit are examined to see if the requirements of heavy-quark symmetry are satisfied. We find that the Bauer-Stech-Wirbel-type light-front wave function fails to give a correct normalization for the Isgur-Wise function at zero recoil in P{r_arrow}V transition. Some of the P{r_arrow}V form factors are found to depend on the recoiling direction of the daughter mesons relative to their parents. Thus the inclusion of the nonvalence contribution arising from quark-pair creation is mandatory in order to ensure that the physical form factors are independent of the recoiling direction. The main feature of the nonvalence contribution is discussed. {copyright} {ital 1997} {ital The American Physical Society}
209866944
Gamma(phi ---> eta-prime gamma)/Gamma(phi ---> eta gamma) and the pseudoscalar mixing angle
204174153
Combined chiral dynamics and MIT bag model study of strong Sigma(*) Q-->LambdaQpi decays
11335733
Charge radii of light and heavy mesons
Abstract. We calculate the electromagnetic (EM) form factors of the pseudoscalar mesons in the light-front framework. Specifically, these form factors are directly extracted from the relevant matrix elements, instead of choosing the Breit frame. The results show that the charge radius of the meson is related to both the first and second longitudinal momentum square derivatives of the momentum distribution function. The static properties of the EM form factors and the heavy quark symmetry of the charge radii are checked analytically in the heavy quark limit. In addition, we use the Gaussian-type wavefunction to obtain the numerical results.
118628184
Model-independent analysis for determining mass splittings of heavy baryons
We study the hyperfine mass differences of heavy hadrons in the heavy quark effect theory. The effects of one-gluon exchange interaction are considered for the heavy mesons and baryons. Based on the known experimental data, we predict the masses of some heavy baryons in a model-independent way.
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.
53130855
Factorization of the 3 d superconformal index
We prove that 3d superconformal index for general N = 2 U(N) gauge group with fundamentals and anti-fundmentals with/without Chern-Simons terms is factorized into vortex and anti-vortex partition function. We show that for simple cases, 3d vortex partition function coincides with a suitable topological open string partition function. We provide much more elegant derivation at the index level for N = 2 Seiberg-like dualities of unitary gauge groups with fundamantal matters and N = 4 mirror symmetry
42662726
Magnetic Field Measurement on a Refined Kicker
To provide wide horizontal aperture of kicker ceramic chamber at the downstream of a short insertion devices and prepare for the operation of top-up mode injection, the National Synchrotron Radiation Research Center (NSRRC) has upgraded the kicker systems. The new systems have been tested and installed. An efficient procedure of in-situ wave form tuning was proposed and tested successfully.
40457848
Pulsed wire magnetic field measurements on undulator U10P
Several laboratories have used the pulsed wire method for magnetic field measurement. The acoustic wave distortion of the wire was observed. The limitations of this method were discussed. A pulsed wire system is under test in SRRC on an undulator U10p with a total length of 2m. In this paper the authors clarify the effect of wire imperfection and dispersion of acoustic wave, which are deemed to the main sources of the distortion and limitations. A strategy using thick wire is proposed to make this method reliable in precise measurement.
109334639
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