6,609 research outputs found
Inclusive hadron and photon production at LHC in dipole momentum space
Using a momentum space model for the dipole scattering amplitude we present
an analysis of the saturation effects at LHC energies, describing the data on
proton-proton and proton-lead collisions. The model is based on the asymptotic
solutions of the Balitsky-Kovchegov equation, being ideal in the saturation
domain where the target wave function has a high occupation number. We also
make predictions for the nuclear modification ratios on charged hadron and
prompt photon production in the forward region, where the high parton density
effects are important.Comment: New section added and typos corrected. To be published in PR
Photon and Pomeron -- induced production of Dijets in , and collisions
In this paper we present a detailed comparison of the dijet production by
photon -- photon, photon -- pomeron and pomeron -- pomeron interactions in
, and collisions at the LHC energy. The transverse
momentum, pseudo -- rapidity and angular dependencies of the cross sections are
calculated at LHC energy using the Forward Physics Monte Carlo (FPMC), which
allows to obtain realistic predictions for the dijet production with two
leading intact hadrons. We obtain that \gamma \pom channel is dominant at
forward rapidities in collisions and in the full kinematical range in the
nuclear collisions of heavy nuclei. Our results indicate that the analysis of
dijet production at the LHC can be useful to test the Resolved Pomeron model as
well as to constrain the magnitude of the absorption effects.Comment: 11 pages, 6 figures, 1 table. Improved and enlarged version published
in European Physical Journal
Cusp anomalous dimension in maximally supersymmetric Yang-Mills theory at strong coupling
We construct an exact analytical solution to the integral equation which is
believed to describe logarithmic growth of the anomalous dimensions of high
spin operators in planar N=4 super Yang-Mills theory and use it to determine
the strong coupling expansion of the cusp anomalous dimension.Comment: 5 pages. v3: minor corrections, references and important note adde
Momentum space saturation model for deep inelastic scattering and single inclusive hadron production
We show how the AGBS model, originally developed for deep inelastic
scattering applied to HERA data on the proton structure function, can also
describe the RHIC data on single inclusive hadron yield for and
collisions through a new simultaneous fit. The single inclusive hadron
production is modeled through the color glass condensate, which uses the
quark(and gluon)--condensate amplitudes in momentum space. The AGBS model is
also a momentum space model based on the asymptotic solutions of the BK
equation, although a different definition of the Fourier transform is used.
This aspect is overcome and a description entirely in transverse momentum of
both processes arises for the first time. The small difference between the
simultaneous fit and the one for HERA data alone suggests that the AGBS model
describes very well both kind of processes and thus emerges as a good tool to
investigate the inclusive hadron production data. We use this model for
predictions at LHC energies, which agree very well with available experimental
data.Comment: 10 pages, 7 figure
Resonant Leptogenesis in the Minimal B-L Extended Standard Model at TeV
We investigate the resonant leptogenesis scenario in the minimal B-L extended
standard model(SM) with the B-L symmetry breaking at the TeV scale. Through
detailed analysis of the Boltzmann equations, we show how much the resultant
baryon asymmetry via leptogenesis is enhanced or suppressed, depending on the
model parameters, in particular, the neutrino Dirac Yukawa couplings and the
TeV-scale Majorana masses of heavy degenerate neutrinos. In order to consider a
realistic case, we impose a simple ansatz for the model parameters and analyze
the neutrino oscillation parameters and the baryon asymmetry via leptogenesis
as a function of only a single CP-phase. We find that for a fixed CP-phase all
neutrino oscillation data and the observed baryon asymmetry of the present
universe can be simultaneously reproduced.Comment: 25 pages, 15 figures, version to be published in Phys. Rev.
The synovial surface of the articular cartilage
The articular cartilage has been the subject of a huge amount of research carried out with a wide array of different techniques. Most of the existing morphological and ultrastructural data on the this tissue, however, were obtained either by light microscopy or by transmission electron microscopy. Both techniques rely on thin sections and neither allows a direct, face-on visualization of the free cartilage surface (synovial surface), which is the only portion subject to frictional as well as compressive forces. In the present research, high resolution visualization by scanning electron microscopy and by atomic force microscopy revealed that the collagen fibrils of the articular surface are exclusively represented by thin, uniform, parallel fibrils evocative of the heterotypic type IX-type II fibrils reported by other authors, immersed in an abundant matrix of glycoconjugates, in part regularly arranged in phase with the D-period of collagen. Electrophoresis of fluorophore-labeled saccharides confirmed that the superficial and the deeper layers are quite different in their glycoconjugate content as well, the deeper ones containing more sulfated, more acidic small proteoglycans bound to thicker, more heterogenous collagen fibrils. The differences found between the synovial surface and the deeper layers are consistent with the different mechanical stresses they must withstand
Inclusive gauge boson production in the color dipole formalism
The inclusive production of the gauge bosons and is studied
within the color dipole formalism. Gluon saturation effects associated to
non-linear corrections to the QCD dynamics, which are expected to contribute at
high energies, are naturally included in such formalism. We estimate the
contribution of these effects at LHC energies and compare our results with the
next-to-next-to-leading order collinear predictions. A comparison with the
current experimental data is performed and predictions for higher energies are
presented.Comment: 12 pages, 6 figures, 2 tables. Version to be published in Physical
Review
The experience of individuals placed in quarantine: A systematic review, meta-summary, and meta-synthesis
Objective: To summarize the experience of individuals placed in quarantine during an outbreak. Design: A meta-summary and a meta-synthesis based upon a systematic review of qualitative studies. Sample: The Cumulative Index of Nursing and Allied Health Literature, MEDLINE, and Scopus databases were all searched up to April 2020. Measurements: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were followed; then, the methodological quality of the studies included was assessed with the Critical Appraisal Screening Programme tool for qualitative studies. Results: Five studies have been included documenting the experience of 125 adult individuals. A total of 16 codes emerged: in the meta-summary, the most and least frequent codes were \u201cThinking about quarantine\u201d (80%) and \u201cEmotional roller coaster,\u201d \u201cBeing alert for any symptom,\u201d \u201cTrusting or not?,\u201d \u201cKnowing who brought the infection,\u201d and \u201cLiving in a surreal world\u201d (20%). The codes which emerged were categorized into three main themes which summarized the whole experience of being placed in quarantine: (a) \u201cBeing swamped with a thousand emotions\u201d; (b) \u201cBeing restrained\u201d; and (c) \u201cNeeding to be considered.\u201d. Conclusions: The experience of quarantine for people is a long journey which can feel chaotic due to uncertainty about the consequences on health, work, and the future. The findings of this study can help nurses in caring for quarantined individuals by enabling them to understand people's need for educational and emotional support. Ensuring the supply of consistent information is also important to increase people's compliance
- …