1,408 research outputs found
Phenomenology of the polarized cross-sections of the rho meson leptoproduction at high energy
We present a model for the polarized cross-sections of the hard diffractive
leptoproduction of rho meson in the high energy limit. Our model is based on
the light-cone collinear factorization of the virtual photon to rho meson
impact factor when using the impact factor representation of the helicity
amplitudes of the rho meson leptoproduction. This gauge invariant treatment
when expressed in impact parameter space, leads to the factorization on one
hand of the color dipole scattering amplitude and on the other hand of the
distribution amplitudes of the rho meson up to twist 2 and 3. We show that the
results of this approach are in good agreement with HERA data for virtualities
above ~5 GeV^2.Comment: 6 pages, 3 figures, proceedings of Photon 2013, May 20 - 24 2013,
Paris, Franc
New string vacua from twistor spaces
We find a new family of AdS_4 vacua in IIA string theory. The internal space
is topologically either the complex projective space CP^3 or the "flag
manifold" SU(3)/(U(1)xU(1)), but the metric is in general neither Einstein nor
Kaehler. All known moduli are stabilized by fluxes, without using quantum
effects or orientifold planes. The analysis is completely ten--dimensional and
does not rely on assumptions about Kaluza--Klein reduction.Comment: 19 pages. v3: published version, further minor correction
High Energy exclusive Leptoproduction of the rho-meson: Theory and Phenomenology
We describe the hard leptoproduction of transversally polarized rho-meson, up
to twist 3 accuracy, including 2- and 3- particles Fock-states, in the HERA
kinematics of high center-of-mass energy. We first build a model based on a
simple approach to the unintegrated gluon density (the parton impact factor)
that we compare with H1 and ZEUS data for the ratios of helicity amplitudes
T(gamma*T -> rhoT)/T(gamma*L -> rhoL) and T(gamma*T -> rhoL)/T(gamma*L -> rhoL)
and get a good description of the data. We also show how saturation effects can
be included in this model by extending the dipole representation of the
scattering amplitude in coordinate space up to twist 3.Comment: 4 pages, 3 figures, to appear in the proceedings of 20th
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2012), Bonn, Germany, 26-30 March 201
Theory and phenomenology of helicity amplitudes for high energy exclusive leptoproduction of the rho-meson
We review here two approaches to describe hard leptoproduction of
transversally polarized rho-meson, based on recent calculation of the gamma*T
-> rhoT impact factor up to twist 3 accuracy in the collinear factorization
frame, including 2- and 3- particles Fock-states. The first approach uses a
model of the unintegrated gluon density (the proton impact factor) which allows
a comparison of our predictions with H1 and ZEUS data for the ratios of
helicity amplitudes T(gamma*T -> rhoT)/T(gamma*L -> rhoL) and T(gamma*T ->
rhoL)/T(gamma*L -> rhoL). In the second approach, we transform the gamma*T ->
rhoT impact factor into the impact parameter space. We show that the
transformed amplitude factorizes according to conventional dipole picture. We
shortly discuss a way to implement the nucleon saturation effects in our
approach.Comment: 5 pages, 2 figures, to appear in the proceedings of 6th International
Conference on Quarks and Nuclear Physics (QNP 2012), Palaiseau, France, April
16-20, 201
A phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the rho meson
We apply a previously developed scheme to consistently include the twist-3
distribution amplitudes for transversely polarized rho meson in order to
evaluate, in the framework of kT factorization, the helicity amplitudes for
exclusive leptoproduction of a light vector meson, at leading order in alphaS.
We compare our results with high energy experimental data for the ratios of
helicity amplitudes T11/T00 and T01/T00 and get a good description of the data.Comment: 20 pages, 11 figures, published version in PR
The sectional curvature remains positive when taking quotients by certain nonfree actions
We study some cases when the sectional curvature remains positive under the
taking of quotients by certain nonfree isometric actions of Lie groups. We
consider the actions of the groups and such that the quotient space
can be endowed with a smooth structure using the fibrations
and . We prove that the quotient space
carries a metric of positive sectional curvature, provided that the original
metric has positive sectional curvature on all 2-planes orthogonal to the
orbits of the action.Comment: 26 pages, 1 figure. Changed the spelling of the author's nam
Clustering Time-Series Gene Expression Data Using Smoothing Spline Derivatives
Microarray data acquired during time-course experiments allow the temporal variations in gene expression to be monitored. An original postprandial fasting experiment was conducted in the mouse and the expression of 200 genes was monitored with a dedicated macroarray at 11 time points between 0 and 72 hours of fasting. The aim of this study was to provide a relevant clustering of gene expression temporal profiles. This was achieved by focusing on the shapes of the curves rather than on the absolute level of expression. Actually, we combined spline smoothing and first derivative computation with hierarchical and partitioning clustering. A heuristic approach was proposed to tune the spline smoothing parameter using both statistical and biological considerations. Clusters are illustrated a posteriori through principal component analysis and heatmap visualization. Most results were found to be in agreement with the literature on the effects of fasting on the mouse liver and provide promising directions for future biological investigations
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