3,314 research outputs found
NRQCD Predictions of D-Wave Quarkonia Decay into Light Hadrons at Order
In this paper, in the framework of NRQCD we study the light hadron (LH)
decays of the spin-triplet (S=1) D-wave heavy quarkonia. The short distance
coefficients of all Fock states in the quarkonia including
D-wave color-singlet, P-wave color-octet and S-wave color-singlet and
color-octet are calculated perturbatively at order. The operator
evolution equations of the four-fermion operators are also derived and are used
to estimate the numerical values of the long distance matrix elements. We find
that for the system, the LH decay widths of predicted
by NRQCD is about times larger than the phenomenological potential
model results, while for the system the two theoretical estimations
of are in coincidence with each other. Our
predictions for LH decay widths are MeV for J=1,2,3; and for ,
KeV for J=1,2,3.Comment: 12 figures, references added, published version in PR
CleanNet: Transfer Learning for Scalable Image Classifier Training with Label Noise
In this paper, we study the problem of learning image classification models
with label noise. Existing approaches depending on human supervision are
generally not scalable as manually identifying correct or incorrect labels is
time-consuming, whereas approaches not relying on human supervision are
scalable but less effective. To reduce the amount of human supervision for
label noise cleaning, we introduce CleanNet, a joint neural embedding network,
which only requires a fraction of the classes being manually verified to
provide the knowledge of label noise that can be transferred to other classes.
We further integrate CleanNet and conventional convolutional neural network
classifier into one framework for image classification learning. We demonstrate
the effectiveness of the proposed algorithm on both of the label noise
detection task and the image classification on noisy data task on several
large-scale datasets. Experimental results show that CleanNet can reduce label
noise detection error rate on held-out classes where no human supervision
available by 41.5% compared to current weakly supervised methods. It also
achieves 47% of the performance gain of verifying all images with only 3.2%
images verified on an image classification task. Source code and dataset will
be available at kuanghuei.github.io/CleanNetProject.Comment: Accepted to CVPR 201
Probing Electroweak Symmetry Breaking Mechanism at the LHC: A Guideline from Power Counting Analysis
We formulate the equivalence theorem as a theoretical criterion for
sensitively probing the electroweak symmetry breaking mechanism, and develop a
precise power counting method for the chiral Lagrangian formulated electroweak
theories. Armed with these, we perform a systematic analysis on the
sensitivities of the scattering processes
and for testing all possible effective bosonic
operators in the chiral Lagrangian formulated electroweak theories at the CERN
Large Hadron Collider (LHC). The analysis shows that these two kinds of
processes are "complementary" in probing the electroweak symmetry breaking
sector.Comment: Extended version, 11-page-Latex-file and 3 separate PS-Figs. To be
Published in Mod.Phys.Lett.
Sensitivity of the LHC to Electroweak Symmetry Breaking: Equivalence Theorem as a Criterion
Based upon our recent study on the intrinsic connection between the
longitudinal weak-boson scatterings and probing the electroweak symmetry
breaking (EWSB) mechanism, we reveal the profound physical content of the
Equivalence Theorem (ET) as being able to discriminate physical processes which
are sensitive/insensitive to probing the EWSB sector. With this physical
content of the ET as a criterion, we analyze the complete set of the bosonic
operators in the electroweak chiral Lagrangian and systematically classify the
sensitivities to probing all these operators at the CERN LHC via the weak-boson
fusion in channel. This is achieved by developing a precise power
counting rule (a generalization from Weinberg's counting method) to {\it
separately} count the power dependences on the energy and all relevant mass
scales.Comment: 33 pages, LaTeX, 10 figures and Table-1b are in the separate file
figtab.uu. (The only change made from the previous version is to fix the bugs
in the uuencoded file.
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
Longitudinal/Goldstone boson equivalence and phenomenology of probing the electroweak symmetry breaking
We formulate the equivalence between the longitudinal weak-boson and the
Goldstone boson as a criterion for sensitively probing the electroweak symmetry
breaking mechanism and develop a precise power counting rule for chiral
Lagrangian formulated electroweak theories. With these we semi-quatitatively
analyze the sensitivities to various effective operators related to
electrowaeak symmetry breaking via weak-boson scatterings at the CERN Large
Hadron Collider (LHC).Comment: 6 pages, LaTex, 1 postscript figure included using psfig.te
Search for charmonium and bottomonium states in at B factories
We study the production of charmonium states in at B factories with (n=1,2,3), (m=1,2), and
. In the S and P wave case, contributions of tree-QED with one-loop
QCD corrections are calculated within the framework of nonrelativistic
QCD(NRQCD) and in the D-wave case only the tree-QED contribution are
considered. We find that in most cases the QCD corrections are negative and
moderate, in contrast to the case of double charmonium production , where QCD corrections are positive and large in most cases. We
also find that the production cross sections of some of these states in
are larger than that in by an
order of magnitude even after the negative QCD corrections are included. So we
argue that search for the X(3872), X(3940), Y(3940), and X(4160) in at B factories may be helpful to clarify the nature of these
states. For completeness, the production of bottomonium states in
annihilation is also discussed.Comment: 13pages, 4 figure
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