2,585 research outputs found
QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan Processes at Low Transverse Momentum
Based on a recent work on the quantum chromodynamic (QCD) factorization for
semi-inclusive deep-inelastic scattering (DIS), we present a set of
factorization formulas for the spin-dependent DIS and Drell-Yan cross sections
at low transverse momentum.Comment: 12 pages, two figures include
Comment on "Chiral Suppression of Scalar Glueball Decay"
Comment on ``Chiral Suppression of Scalar Glueball Decay''Comment: Comment published in Phys. Rev. Lett. 98, 149103(2007
Threshold Resummation for Higgs Production in Effective Field Theory
We present an effective field theory to resum the large double logarithms
originated from soft-gluon radiations at small final-state hadron invariant
masses in Higgs and vector boson (\gamma^*, and ) production at hadron
colliders. The approach is conceptually simple, indepaendent of details of an
effective field theory formulation, and valid to all orders in sub-leading
logarithms. As an example, we show the result of summing the
next-to-next-to-next leading logarithms is identical to that of standard pQCD
factorization method.Comment: A version to appear in Phys. Rev.
MRILDU: An Improvement to ILUT Based on Incomplete LDU Factorization and Dropping in Multiple Rows
We provide an improvement MRILDU to ILUT for general sparse linear systems in the paper.
The improvement is based on the consideration that relatively large elements should be kept down
as much as possible. To do so, two schemes are used. Firstly, incomplete LDU factorization is used instead of incomplete LU. Besides, multiple rows are computed at a time, and then dropping is applied to these rows to extract the relatively large elements in magnitude. Incomplete LDU is not only fairer when there are large differences between the elements of factors L and U, but also more natural
for the latter dropping in multiple rows. And the dropping in multiple rows is more profitable, for
there may be large differences between elements in different rows in each factor. The provided
MRILDU is comparable to ILUT in storage requirement and computational complexity. And the
experiments for spare linear systems from UF Sparse Matrix Collection, inertial constrained
fusion simulation, numerical weather prediction, and concrete sample simulation show that it is
more effective than ILUT in most cases and is not as sensitive as ILUT to the parameter p, the
maximum number of nonzeros allowed in each row of a factor
Investigating the topological structure of quenched lattice QCD with overlap fermions by using multi-probing approximation
The topological charge density and topological susceptibility are determined
by multi-probing approximation using overlap fermions in quenched SU(3) gauge
theory. Then we investigate the topological structure of the quenched QCD
vacuum, and compare it with results from the all-scale topological density, the
results are consistent. Random permuted topological charge density is used to
check whether these structures represent underlying ordered properties.
Pseudoscalar glueball mass is extracted from the two-point correlation function
of the topological charge density. We study ensembles of different lattice
spacing with the same lattice volume , the results are
compatible with the results of all-scale topological charge density, and the
topological structures revealed by multi-probing are much closer to all-scale
topological charge density than that by eigenmode expansion.Comment: 12 pages,34 figure
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