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

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

https://biblio.ugent.be/publication/685594/file/1130605.pdf

Review of Particle Physics

This article reports world averages of measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available through the end of 2011. In some cases results available in the early part of 2012 are included. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays and CKM matrix elements.

/pdf/averages-of-b-hadron-c-hadron-and-tau-lepton-properties-as-29qrkk2j2g.pdf

Averages of b-hadron, c-hadron, and tau-lepton properties as of early 2012

The Fortran LHAPDF library has been a long-term workhorse in particle physics, providing standardised access to parton density functions for experimental and phenomenological purposes alike, following on from the venerable PDFLIB package During Run 1 of the LHC, however, several fundamental limitations in LHAPDF’s design have became deeply problematic, restricting the usability of the library for important physics-study procedures and providing dangerous avenues by which to silently obtain incorrect results In this paper we present the LHAPDF 6 library, a ground-up re-engineering of the PDFLIB/LHAPDF paradigm for PDF access which removes all limits on use of concurrent PDF sets, massively reduces static memory requirements, offers improved CPU performance, and fixes fundamental bugs in multi-set access to PDF metadata The new design, restricted for now to interpolated PDFs, uses centralised numerical routines and a powerful cascading metadata system to decouple software releases from provision of new PDF data and allow completely general parton content More than 200 PDF sets have been migrated from LHAPDF 5 to the new universal data format, via a stringent quality control procedure LHAPDF 6 is supported by many Monte Carlo generators and other physics programs, in some cases via a full set of compatibility routines, and is recommended for the demanding PDF access needs of LHC Run 2 and beyond

/pdf/lhapdf6-parton-density-access-in-the-lhc-precision-era-zeulwgh83c.pdf

LHAPDF6: parton density access in the LHC precision era

RunDec: A Mathematica package for running and decoupling of the strong coupling and quark masses

We analytically compute the five-loop term in the beta function which governs the running of α_{s}-the quark-gluon coupling constant in QCD. The new term leads to a reduction of the theory uncertainty in α_{s} taken at the Z-boson scale as extracted from the τ-lepton decays as well as to new, improved by one more order of perturbation theory, predictions for the effective coupling constants of the standard model Higgs boson to gluons and for its total decay rate to the quark-antiquark pairs.

Five-Loop Running of the QCD Coupling Constant

Using recently developed methods for the evaluation of five-loop amplitudes in perturbative QCD, corrections of order {alpha}{sub s}{sup 4} for the nonsinglet part of the cross section for electron-positron annihilation into hadrons and for the decay rates of the Z boson and the {tau} lepton into hadrons are evaluated. The new terms lead to a significant stabilization of the perturbative series, to a reduction of the theory uncertainly in the strong coupling constant {alpha}{sub s}, as extracted from these measurements, and to a small shift of the central value, moving the two central values closer together. The agreement between two values of {alpha}{sub s} measured at vastly different energies constitutes a striking test of asymptotic freedom. Combining the results from Z and {tau} decays we find {alpha}{sub s}(M{sub Z})=0.1198{+-}0.0015 as one of the most precise and presently only result for the strong coupling constant in order {alpha}{sub s}{sup 4}.

Order alphas4 QCD corrections to Z and tau decays.

Weak radiative B-meson decay beyond leading logarithms

In this paper the formulae are collected which are needed for the computation of the strong coupling constant and quark masses at different energy scales and for different number of active flavours. All equations contain the state-of-the-art QCD corrections up to three- and sometimes even four-loop order. For the practical implementation {\tt Mathematica} is used and a package containing useful procedures is provided.

K.G. Chetyrkin

Papers

RunDec: A Mathematica package for running and decoupling of the strong coupling and quark masses

Five-Loop Running of the QCD Coupling Constant

Order alphas4 QCD corrections to Z and tau decays.

Weak radiative B-meson decay beyond leading logarithms

RunDec: a Mathematica package for running and decoupling of the strong coupling and quark masses