Analytical solutions of the QCD⊗\otimesQED DGLAP evolution equations based on the Mellin transform technique in NLO approximation

In this paper we present a new and efficient analytical solutions for evolving the QED$\otimes$QCD DGLAP evolution equations in mellin space and obtain the parton distribution functions (PDFs) in perturbative QCD including the QED corrections. The validity of our analytical solutions, which have done in the next to leading order QCD and the leading order QED approximations, are checked with the initial parton distributions from newly released CT14QED global analysis code (Phys. Rev.D93,114015(2016)). The evolved parton distributions are in good agreement with CT14QED code and also with those from APFEL (Computer Physics Communications 185, 1647 (2014)) program

Evolution of heavy quark distribution function in quark-gluon plasma: using the Iterative Laplace Transform Method

The "Iterative Laplace Transform Method" is used to solve the Fokker-Planck equation for finding the time evolution of the heavy quarks distribution functions such as charm and bottom in quark gluon plasma. These solutions will lead us to calculation of nuclear suppression factor RAA. The results have good agreement with available experiment data from the PHENIX collaboration.Comment: 13 pages, 4 figure

A comparative study of different approaches for heavy quark energy loss, based on the latest experimental data

This paper presents a comparative analysis of three distinct methods used to calculate the collisional energy loss of heavy quarks in Quark-Gluon Plasma. The study focuses on the calculation of the nuclear suppression factor of charm quarks in Pb-Pb collisions at $\sqrt{S_{NN}} = 5.02$ TeV. All three models are examined using the same numerical evolution based on the well-known Fokker-Planck equation by considering critical phenomena like a non-equilibrium state at the onset of heavy ion collision. The outcomes of each approach are compared with the latest data from ALICE and ATLAS experiments spanning from 2018 to 2022. This study aims to compare the degree of agreement between each approach and recently obtained experimental data, in the intermediate and high $P_T$ regions.Comment: 20 Pages, 5 Figures, 4 Table

Mediating Role of Goal Orientation in the Relationship of Spirituality and Self-Efficacy with Hope in University Students: a Structural Model

For downloading the full-text of this article please click here. Background and Objective:Religion and spiritual beliefs are of particular significance in human’s life. Self-efficacy is also a motivating factor for activating, strengthening, sustaining, and guiding behavior toward the goal. Each of these two variables can affect different aspects of life, even how hopeful individuals are. Taking this into account, this study aimed to examine the role of spirituality and self-efficacy in students' hope given the mediating role of goal orientation.Method: The research method is descriptive-correlational, using path analysis. The statistical population included students from Ferdowsi University of Mashhad. Regarding the number of variables in the proposed path analysis model, which is considered for each variable of 15 people, and by considering the criterion of the generalizability of sample findings to the community, 280 students from the statistical population were selected through available sampling method. To collect data, spirituality, self-efficacy, hope and goal orientation questionnaires were used. The data were analyzed using descriptive statistics, Pearson correlation and path analysis. All ethical issues were observed in this study and the researchers declared no conflict of interests.Results: The correlation results show that all of the observed variables correlate (p<0.01). Performing a path analysis to test the relationship between the role of spirituality and self-efficacy on hope through goal orientation and the proposed pattern (RMSEA=0.098, GFI=0/99) showed to be well fit.Conclusion:The results of this research suggest that spirituality and self-efficacy through the goal orientation mediation will increase the hope of students. Therefore, considering the positive impact of self-efficacy and spirituality and goal orientation, the use of these capacities is recommended in individual and group planning and activities of students to boost their hopes.For downloading the full-text of this article please click here

Effects of Scientific Collaboration between Domestic and Foreign Authors on Quality Indices of Journals

The aim of the study was to determine the effect of scientific collaboration between domestic (Iranian) and foreign authors on their quality indices in articles published in Iranian medical journals, indexed in the Web of Science citation database. The present scientometric study was conducted on the 22 Iranian medical journals that indexed in Web of Science from 2010 to 2016. Using stratified systematic random sampling method and Cochran formula, the sample size was determined 1230 articles. The data analysis was performed by Microsoft Excel and descriptive methods. The qualitative indices were determined using the Klimogrof-Smirnov test, Kruskal-Wallis test and correlation coefficient. The results revealed that 4.66 percent of the articles were compiled by Iranian authors, 29 percent written by foreign authors and 6.4 percent was written by scientific collaboration between Iranian and foreign authors. The average number of authors for each article was 4.9. The journals that have articles which have Iranian authors have a lower Impact Factor (0.69%) than the journal's articles which is the product of the collaboration of Iranian and foreign authors (0.82%). In conclusion, international collaboration in the writing of articles has a direct effect on qualitative indexes of articles, including Impact Factor, 5-years Impact Factor, Immediacy index and journal's Impact Factor

I understand your pain but I do not feel it: lower affective empathy in response to others’ social pain in narcissism

Introduction: While the relationship between narcissism and empathy has been well-researched, studies have paid less attention to empathic accuracy, i.e., appreciating the precise strength of another person’s emotions, and self-other distinction, in terms of the disparity between affective ratings for self and other in response to emotive stimuli. Furthermore, empathic responses may vary depending on whether the pain is physical or social.Methods: We investigated empathic accuracy, affective empathy, and the distinction between pain, emotion and intensity ratings for self and other, in high (n = 44) and low (n = 43) narcissism groups (HNG and LNG, respectively) selected from 611 students, in response to both types of pain. Participants watched six videos where targets expressed genuine experiences of physical and social pain, and rated the perceived affect and pain experienced by the person in the video and their own empathic emotional responses.Results and discussion: The HNG displayed lower affective empathy and empathic accuracy than the LNG for both pain types. Within the HNG there was higher empathic accuracy for social vs. physical pain, despite reduced affective empathy for social pain, in contrast to the LNG. In addition to this paradox, the HNG demonstrated greater differences between ratings for the self and for target others than the LNG, suggesting that narcissism is associated with higher self-other distinction in response to viewing other people describing social pain