2,115 research outputs found
Three Dimensional Imaging of the Nucleon and Semi-Inclusive High Energy Reactions
We present a short overview on the studies of transverse momentum dependent
parton distribution functions of the nucleon. The aim of such studies is to
provide a three dimensional imagining of the nucleon and a comprehensive
description of semi-inclusive high energy reactions. By comparing with the
theoretical framework that we have for the inclusive deep inelastic
lepton-nucleon scattering and the one-dimensional imaging of the nucleon, we
summarize what we need to do in order to construct such a comprehensive
theoretical framework for semi-inclusive processes in terms of three
dimensional gauge invariant parton distributions. After that, we present an
overview of what we have already achieved with emphasize on the theoretical
framework for semi-inclusive reactions in leading order perturbative QCD but
with leading and higher twist contributions. We summarize in particular the
results for the differential cross section and the azimuthal spin asymmetries
in terms of the gauge invariant transverse momentum dependent parton
distribution functions. We also briefly summarize the available experimental
results on semi-inclusive reactions and parameterizations of transverse
momentum dependent parton distributions extracted from them and make an outlook
for the future studies.Comment: 20 pages, 7 figure
THE IMPACT OF SOCIAL PSYCHOLOGICAL FACTORS ON THE RELATIONSHIP QUALITY OF FACEBOOK USERS
Armed with the great potential for business value and social networking, social media have generated great interests in academia and practice. Rare studies investigated the impact of social psychological factors on the usage of Facebook and the formation of quality relationship. The objective of this paper is to examine the key social psychological factors to better explain the formation of quality relationship. Our proposed theoretical model combined the theories of social influence, social identity, and social presence to capture the essences of the relationship quality between users and Facebook. We conducted a survey to collect data and empirically test our proposed model. Overall, our findings provide theoretical insights to explain the influence of social psychological factors on the usage of Facebook and quality relationship. These findings also help practitioners to plan marketing strategies in better utilize social network sites
Exploring the Collective Phenomenon at the Electron-Ion Collider
Based on rare fluctuations in strong interactions, we argue that there is a
strong physical resemblance between the high multiplicity events in
photo-nuclear collisions and those in collisions, in which interesting
long range collective phenomena are discovered. This indicates that the
collectivity can also be studied in certain kinematic region of the upcoming
Electron-Ion Collider (EIC) where the incoming virtual photon has a
sufficiently long lifetime. Using a model in the Color Glass Condensate
formalism, we first show that the initial state interactions can explain the
recent ATLAS azimuthal correlation results measured in the photo-nuclear
collisions, and then we provide quantitative predictions for the long range
correlations in collisions in the EIC regime. With the unprecedented
precision and the ability to change the size of the collisional system, the
high luminosity EIC will open a new window to explore the physical mechanism
responsible for the collective phenomenon.Comment: 6 pages, 3 figures; published versio
The Spin Alignment of Vector Mesons in High Energy pp Collisions
The spin alignment of vector meson produced in high energy reactions is
determined by the spin-dependent fragmentation function
that is shown to be independent of the polarization of the fragmenting quark.
In this paper, we extract the spin-dependent fragmentation function from data on the spin alignment of in annihilation
at LEP in two different scenarios and apply them to make predictions in
collisions. We make detailed analysis of contributions from different
sub-processes and show that the spin alignment should be quite significant also
in high energy collisions.Comment: 12 pages, 16 fgiures,version printed in PR
The influence of water-based drilling fluid on mechanical property of shale and the wellbore stability
AbstractBecause of high cost and pollution of oil-based drilling fluid, the water-based drilling fluid is increasingly used now. However, bedding planes and micro-cracks are rich in shale formation. When water-based drilling fluid contacts formation rock, it causes the propagation of crack and invasion of drilling fluid, which decrease shale strength and cause wellbore instability. In this paper, we analyzed influence of water-based drilling fluid on shale strength and failure mode by mechanics experiment. Based on those experimental results, considering the effect of bedding plane and drilling time, we established modeling of wellbore stability for shale formation. The result from this model indicates that in certain azimuth of horizontal well, collapsing pressure increases dramatically due to shale failure along with bedding plane. In drilling operation, those azimuths are supposed to be avoided. This model is applicable for predication of collapsing pressure in shale formation and offers reference for choosing suitable mud weight
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