다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Statistical physics has proven to be a fruitful framework to describe phenomena outside the realm of traditional physics. Recent years have witnessed an attempt by physicists to study collective phenomena emerging from the interactions of individuals as elementary units in social structures. A wide list of topics are reviewed ranging from opinion and cultural and language dynamics to crowd behavior, hierarchy formation, human dynamics, and social spreading. The connections between these problems and other, more traditional, topics of statistical physics are highlighted. Comparison of model results with empirical data from social systems are also emphasized.

Statistical physics of social dynamics

We have studied the three quark system in a relativized version of the quark potential model with chromodynamics. With parameters consistent with those of an analogous study of meson spectroscopy we obtain a successful description of the spectrum of baryons. The model naturally explains the apparent absence of spin‐orbit interactions in baryons.

Baryons in a relativized quark model with chromodynamics

Monthly Notices is one of the three largest general primary astronomical research publications. It is an international journal, published by the Royal Astronomical Society. This article 1 describes its publication policy and practice.

Monthly Notices of the Royal Astronomical Society

We discuss the role of QCD symmetries and confinement in understanding eta and etaprime mesic nuclei. Eta and etaprime bound states in nuclei are sensitive to the flavour-singlet component in the meson. The bigger the singlet component, the more attraction and the greater the binding. Recent results on the etaprime mass in nuclei from the CBELSA/TAPS collaboration are very similar to the prediction of the Quark Meson Coupling model. In the model eta-etaprime mixing induces a factor of two enhancement of the eta-nucleon scattering length relative to the prediction with a pure octet eta, with real part about 0.8 fm.

QCD symmetries in eta and etaprime mesic nuclei

One of the great challenges of lattice QCD is to produce unambiguous predictions for the properties of physical hadrons. We review recent progress with respect to a major barrier to achieving this goal, namely the fact that computation time currently limits us to large quark mass. Using insights from the study of the lattice data itself, together with the general constraints of chiral symmetry, we demonstrate that it is possible to extrapolate accurately and in an essentially model independent manner from the mass region where calculations will be performed within the next five years to the chiral limit.

Chiral Extrapolation of Hadronic Observables

The quark-meson coupling (QMC) model is applied to a study of the mass of the $\ensuremath{\rho}$-meson in helium and carbon nuclei. The average mass of a $\ensuremath{\rho}$-meson formed in ${}^{3,4}$He and ${}^{12}$C is expected to be around 730, 690, and 720 MeV, respectively.

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ρ-meson mass in light nuclei

We show that the European Muon collaboration effect can be understood in terms of the change in the mass scale of a bound nucleon, rather than in terms of a change in confinement scale.

On the interpretation of the European Muon Collaboration effect.

We present a comprehensive analysis of $\ensuremath{\gamma}Z$ interference corrections to the weak charge of the proton measured in parity-violating electron scattering, including a survey of existing models and a critical analysis of their uncertainties. Constraints from parton distributions in the deep-inelastic region, together with new data on parity-violating electron scattering in the resonance region, result in significantly smaller uncertainties on the corrections compared to previous estimates. At the kinematics of the ${Q}_{\mathrm{weak}}$ experiment, we determine the $\ensuremath{\gamma}Z$ box correction to be $\ensuremath{\mathfrak{R}}e{\ensuremath{\square}}_{\ensuremath{\gamma}Z}^{V}=(5.57\ifmmode\pm\else\textpm\fi{}0.36)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. The new constraints also allow precise predictions to be made for parity-violating deep-inelastic asymmetries on the deuteron.

Anthony W. Thomas

Papers

QCD symmetries in eta and etaprime mesic nuclei

Chiral Extrapolation of Hadronic Observables

ρ-meson mass in light nuclei

On the interpretation of the European Muon Collaboration effect.

Constrained $\gamma Z$ interference corrections to parity-violating electron scattering