1,205 research outputs found
Tool use induces complex and flexible plasticity of human body representations
Plasticity of body representation fundamentally underpins human tool use. Recent studies have demonstrated remarkably complex plasticity of body representation in humans, showing that such plasticity: (1) occurs flexibly across multiple time-scales, and (2) involves multiple body representations responding differently to tool use. Such findings reveal remarkable sophistication of body plasticity in humans, suggesting that Vaesen may overestimate the similarity of such mechanisms in humans and non-human primates
BCFW recursion for TMD parton scattering
We investigate the application of the BCFW recursion relation to scattering
amplitudes with one off-shell particle in a Yang-Mills theory with fermions. We
provide a set of conditions of applicability of the BCFW recursion, stressing
some important differences with respect to the pure on-shell case. We show how
the formulas for Maximally-Helicity-Violating (MHV) configurations with any
number of partons, which are well known in the fully on-shell case, are
generalized to this kinematic regime. We also derive analytic expressions for
all the helicity configurations of the 5-point color-stripped tree-level
amplitudes for any of the partons being off the mass shell.Comment: Some typos in text and formulas correcte
TMD splitting functions in kT factorization: the real contribution to the gluon-to-gluon splitting
We calculate the transverse momentum dependent gluon-to-gluon splitting
function within -factorization, generalizing the framework employed in the
calculation of the quark splitting functions in [1-3] and demonstrate at the
same time the consistency of the extended formalism with previous results.
While existing versions of factorized evolution equations contain already
a gluon-to-gluon splitting function i.e. the leading order
Balitsky-Fadin-Kuraev-Lipatov (BFKL) kernel or the
Ciafaloni-Catani-Fiore-Marchesini (CCFM) kernel, the obtained splitting
function has the important property that it reduces both to the leading order
BFKL kernel in the high energy limit, to the
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) gluon-to-gluon splitting
function in the collinear limit as well as to the CCFM kernel in the soft
limit. At the same time we demonstrate that this splitting kernel can be
obtained from a direct calculation of the QCD Feynman diagrams, based on a
combined implementation of the Curci-Furmanski-Petronzio formalism for the
calculation of the collinear splitting functions and the framework of high
energy factorization.Comment: 29 pages, 5 figures, published versio
Neural-Based Nonlinear Device Models for Intermodulation Analysis
A new procedure to learn a nonlinear model together with its derivative parameters using a composite neural network is presented.So far neural networks have never been used to extract large-signal device model accounting for distortion parameters.Applying this method to FET devices leads to nonlinear models for current- voltage functions which allow improved prediction of weak and mildly device nonlinearities in the whole bias region. The resulting models have demonstrated to be suitable for both small-signal and large-signal analyses,including intermodulation distortion prediction
Calculation of the Z+jet cross section including transverse momenta of initial partons
We perform calculations of Z+jet cross-section taking into account the
transverse momenta of the initial partons. Transverse Momentum Dependent (TMD)
parton densities obtained with the Parton Branching method are used and higher
order corrections are included via TMD parton showers in the initial state. The
predictions are compared to measurements of forward Z+jet production of the
LHCb collaboration at TeV. We show that the results obtained in
kT-factorization are in good agreement with results obtained from a NLO
calculation matched with traditional parton showers. We also demonstrate that
in the forward rapidity region, kT-factorization and hybrid factorization
predictions agree with each other.Comment: 16 pages, 8 figure
The effect of visual perspective on episodic memory in aging: A virtual reality study.
The possibility of flexibly retrieving our memories using a first-person or a third-person perspective (1PP or 3PP) has been extensively investigated in episodic memory research. Here, we used a Virtual Reality-based paradigm to manipulate the visual perspective used during the encoding stage to investigate age-related differences in the formation of memories experienced from 1PP vs. 3PP. 32 young adults and 32 seniors participated in the study. Participants navigated through two virtual cities to encode complex real-life virtual events, from either a 1PP (as if from their egocentric viewpoint) or a 3PP, while actively controlling an avatar. While recognition accuracy was higher in young adults after encoding in 1PP compared to 3PP, there was no benefit in memory formation in 1PP for older adults. These findings are discussed in terms of both age-related changes in episodic memory functioning and self-referencing processes
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