We test the hypothesis that configurations of a proton with a large-x parton, xp ≳ 0.1, have a smaller than average transverse size. The application of the QCD Q2 evolution equations shows that these ...small configurations also have a significantly smaller interaction strength, which has observable consequences in proton-nucleus collisions. We perform a global analysis of jet production data in proton- and deuteronnucleus collisions at RHIC and the LHC. Using a model which takes a distribution of interaction strengths into account, we quantitatively extract the xp dependence of the average interaction strength, σðxpÞ, over a wide kinematic range. By comparing the RHIC and LHC results, our analysis finds that the interaction strength for small configurations, while suppressed, grows faster with collision energy than does that for average configurations. We check that this energy dependence is consistent with the results of a method which, given σðxpÞ at one energy, can be used to quantitatively predict that at another. This finding further suggests that at even lower energies, nucleons with a large-xp parton should interact much more weakly than those in an average configuration, a phenomenon in line with explanations of the EMC effect for largexp quarks in nuclei based on color screening.
A
bstract
The first measurements of energy spectra and substructure of anti-
k
T
jets in hadronic
Z
0
decays in
e
+
e
−
collisions are presented. The archived
e
+
e
−
annihilation data at a ...center-of-mass energy of 91.2 GeV were collected with the ALEPH detector at LEP in 1994. In addition to inclusive jet and leading dijet energy spectra, various jet substructure observables are analyzed as a function of jet energy which includes groomed and ungroomed jet mass to jet energy ratios, groomed momentum sharing, and groomed jet radius. The results are compared with perturbative QCD calculations and predictions from the S
herpa
, H
erwig
v7.1.5, P
ythia
6, P
ythia
8 and P
yquen
event generators. The jet energy spectra agree with perturbative QCD calculations which include the treatment of logarithms of the jet radius and threshold logarithms. None of the event generators give a fully satisfactory description of the data.
The expected connections between signatures in the soft and hard sectors of small collision systems, and the status of experimental attempts to identify them, are discussed. These proceedings ...summarize the talk as given at the International Symposium on Multi- Particle Dynamics in September 2019 in Santa Fe, NM (ISMD19). As such, the choice of content and focus are selective and not intended to be comprehensive.
Here, several methods of generating three constituent quarks in a nucleon are evaluated which explicitly maintain the nucleon's center of mass and desired radial distribution and can be used within ...Monte Carlo Glauber frameworks. The geometric models provided by each method are used to generate distributions over the number of constituent quark participants (Nqp) in p+p,d+Au, and Au+Au collisions. The results are compared with each other and to a previous result of Nqp calculations, without this explicit constraint, used in measurements of √SNN = 200 GeV p+p,d+Au, and Au+Au collisions at the BNL Relativistic Heavy Ion Collider.
Abstract
This work considers the method of the corrugated sheet arrangement near the column wall with the aim to limit liquid fall on the wall and increase liquid concentration in the near-wall area. ...Experiments were carried out at the corrugated Koch 1Y packing sheets for various liquid flow rates. This report presents experimental results on the character of liquid flow near the edge of corrugated sheets and the effect of the middle sheet shift from the edge of the packing. The ribs of this sheet are directed downward to the edge of the packing. Test was performed for two positions of the middle sheet: to study the effect of microtexture orientation at the sheet, whose ribs are directed downward to the packing edge, on liquid distribution under the packing. Experiments were carried out for liquid flow rates of 1-12 ml/s.
Objective. The objective of the study was to investigate the results of operative endoscopic treatment of patients with urological profile depending on the duration of hospitalization.. Patients and ...methods. The study examined the treatment results of 1647 urological patients aged from 41 to 69 years (mean age 57.1 years), including 791 (48.03 %) males and 856 (51.97 %) females. A comparative analysis of the results of operative endoscopic treatment of patients in two groups was conducted. The interventions were comparable in volume. The first group consisted of patients who were observed in a hospital setting for 3-4 days; the second group consisted of patients who were discharged home within the first day. The visual analog scale (VAS) was used to assess pain. Quality of life was determined using the SF-36 questionnaire. Results. The average pain score on the VAS scale in the first day after surgery in both patient groups was 5.45±0.3 and 5.16±0.2 points, respectively, which was considered «tolerable» pain. The quality of life of patients in the two groups during the first day of the postoperative period indicated comparability of data on the PR, PF, BP, and GH scales. Better parameters were recorded in the second group of patients, compared to the first, on the SF, RE, and MH scales. Analysis of the quality of life questionnaire three days after surgery showed improvement in all scales; better results were achieved in the second group of patients, compared to the first, on the VT, SF, RE, and MH scales, which characterized better social functioning and higher vitality. Conclusion. Endoscopic interventions in urology allow for better pain tolerance, especially in the first day after surgery, which has a positive impact on the quality of life of patients. Shortening the length of hospital stay to one day without increasing the pain syndrome increases the socio-economic significance of endoscopic techniques and emphasizes the prospects for further research.
The flow of liquid over the corrugated sheets of regular packings largely determines the processes of heat and mass transfer in distillation columns. An important role in the distribution of liquid ...over the structured packing sheets is played not only by the characteristics of packing surface microtexture, but also by the drip point location in the liquid distributor relative to the sheets in the structured packing plugs. It has been established that even a slight displacement of the drip point relative to the channels of a regular packing can lead to noticeable redistribution of liquid over the packing sheets. Knowledge of the detailed structure of the flow in the distillation column allows better understanding of the physical nature of the mechanisms that control the flow. It is shown experimentally that the negative impact of the uncertainty associated with the drip point position on the liquid distribution under a layer of a structured packing can be reduced using liquid redistributors in the form of inclined plates with horizontal microtexture.
The paper considers a mathematical model of the land use problem on hypergraphs. It is shown that, within the framework of this model, the problem can be formulated as an optimization problem on a ...fragmented structure. Moreover, the problem of finding the optimal solution itself reduces to the problem of unconditional combinatorial optimization on a set of permutations. A variant of a hybrid algorithm for finding approximate solutions to the problem based on a combination of a fragmented algorithm and an ant colony algorithm is proposed.
Sufficient conditions are studied for the presence of the completeness or quasicompleteness property in two-criteria discrete optimization problems with the same and different weight-type criteria. ...Estimates are computed for the cardinalities of sets of feasible solutions, the Pareto set, and a complete set of alternatives for a number of two-criteria problems.
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