6,555 research outputs found
On the Dynamics of Light Quarks in QCD
We describe recent results concerning the behavior of lattice QCD with light
dynamical Wilson and Staggered quarks. We show that it is possible to reach
regions of parameter space with light pions using Wilson
fermions. If the Hybrid Molecular Dynamics (HMD) algorithm is used with the
same parameters it gives incorrect results. We also present preliminary results
using a higher-order integration scheme.Comment: 4 pages (all in postscript), proceedings of LAT'9
Testing Algorithms for Finite Temperature Lattice QCD
We discuss recent algorithmic improvements in simulating finite temperature
QCD on a lattice. In particular, the Rational Hybrid Monte Carlo(RHMC)
algorithm is employed to generate lattice configurations for 2+1 flavor QCD.
Unlike the Hybrid R Algorithm, RHMC is reversible, admitting a Metropolis
accept/reject step that eliminates the errors
inherent in the R Algorithm. We also employ several algorithmic speed-ups,
including multiple time scales, the use of a more efficient numerical
integrator, and Hasenbusch pre-conditioning of the fermion force.Comment: 4 pages, 2 figures, poster presented at International Conference on
Strong and Electroweak Matter 2006 (SEWM2006), BNL, May 10-13, 200
Progress on lattice QCD algorithms
I review recent progress on algorithms for calculating quark propagators and
for simulating full QCD.Comment: 8 uuencoded PostScript pages, contribution to LAT95 (fig.1 simplified
to conserve space; available upon request
Recent Developments in Fermion Simulation Algorithms
A summary of recent developments in the field of simulation algorithms for
dynamical fermions is given.Comment: Plenary talk given at the International Symposium on Lattice Field
Theory, 4-8 June 1996, St. Louis, Mo, USA, Latex, 3 Figures, 7 page
Software Citation in HEP: Current State and Recommendations for the Future
In November 2022, the HEP Software Foundation (HSF) and the Institute for
Research and Innovation for Software in High-Energy Physics (IRIS-HEP)
organized a workshop on the topic of Software Citation and Recognition in HEP.
The goal of the workshop was to bring together different types of stakeholders
whose roles relate to software citation and the associated credit it provides
in order to engage the community in a discussion on: the ways HEP experiments
handle citation of software, recognition for software efforts that enable
physics results disseminated to the public, and how the scholarly publishing
ecosystem supports these activities. Reports were given from the publication
board leadership of the ATLAS, CMS, and LHCb experiments and HEP open source
software community organizations (ROOT, Scikit-HEP, MCnet), and perspectives
were given from publishers (Elsevier, JOSS) and related tool providers
(INSPIRE, Zenodo). This paper summarizes key findings and recommendations from
the workshop as presented at the 26th International Conference on Computing In
High Energy and Nuclear Physics (CHEP 2023).Comment: 7 pages, 2 listings. Contribution to the Proceedings of the 26th
International Conference on Computing In High Energy and Nuclear Physics
(CHEP 2023
The Kentucky Noisy Monte Carlo Algorithm for Wilson Dynamical Fermions
We develop an implementation for a recently proposed Noisy Monte Carlo
approach to the simulation of lattice QCD with dynamical fermions by
incorporating the full fermion determinant directly. Our algorithm uses a
quenched gauge field update with a shifted gauge coupling to minimize
fluctuations in the trace log of the Wilson Dirac matrix. The details of tuning
the gauge coupling shift as well as results for the distribution of noisy
estimators in our implementation are given. We present data for some basic
observables from the noisy method, as well as acceptance rate information and
discuss potential autocorrelation and sign violation effects. Both the results
and the efficiency of the algorithm are compared against those of Hybrid Monte
Carlo.
PACS Numbers: 12.38.Gc, 11.15.Ha, 02.70.Uu Keywords: Noisy Monte Carlo,
Lattice QCD, Determinant, Finite Density, QCDSPComment: 30 pages, 6 figure
CMS Partial Releases: Model, Tools, and Applications. Online and Framework-Light Releases
The CMS Software project CMSSW embraces more than a thousand packages organized in subsystems for analysis, event display, reconstruction, simulation, detector description, data formats, framework, utilities and tools. The release integration process is highly automated by using tools developed or adopted by CMS. Packaging in rpm format is a built-in step in the software build process. For several well-defined applications it is highly desirable to have only a subset of the CMSSW full package bundle. For example, High Level Trigger algorithms that run on the Online farm, and need to be rebuilt in a special way, require no simulation, event display, or analysis packages. Physics analysis applications in Root environment require only a few core libraries and the description of CMS specific data formats. We present a model of CMS Partial Releases, used for preparation of the customized CMS software builds, including description of the tools used, the implementation, and how we deal with technical challenges, such as resolving dependencies and meeting special requirements for concrete applications in a highly automated fashion
Screening disability insurance applications
This paper investigates the effects of stricter screening of disability insurance applications. A large-scale experiment was setup where in two of the 26 Dutch regions case workers of the disability insurance administration were instructed to screen applications more stringently. The empirical results show that stricter screening reduces long-term sickness absenteeism and disability insurance applications. We find evidence for direct effects of stricter screening on work resumption during the period of sickness absence and for self-screening by potential disability insurance applicants. Stricter screening seems to improve targeting efficiency, without inducing negative spillover effects to the inflow into unemployment insurance. The costs of stricter screening are only a small fraction of the monetary benefits.Disability insurance; experiment; policy evaluation; sickness absenteeism; self-screening
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