Rapidity dependence of particle densities in pp and AA collisions

We use multiple scattering and energy conservation arguments to describe $dn/d\eta_{NANA}$ as a function of $dn/d\eta_{pp}$ in the framework of string percolation. We discuss the pseudo-rapidity $\eta$? and beam rapidity Y dependence of particle densities. We present our results for pp, Au- Au, and Pb-Pb collisions at RHIC and LHC.Comment: 12 pages, 6 figure

Assessing Nickel Titanium Binary Systems Using Structural Search Methods and Ab Initio Calculations

Nickel titanium, also know as nitinol, is a prototypical shape memory alloy, a property intimately linked to a phase transition in the microstructure, which allows the meso/macroscopic sample shape to be recovered after thermal cycling. Not much is known about the other alloys in this binary system, which prompted our computational investigation of other compositions. In this work, structures are found by probing the potential energy surfaces of NiTi binary systems using a minima hopping method, in combination with ab initio electronic structure calculations. We find stable structures in 34 different stoichiometries and calculate derived physical properties of the low energy phases. From the results of this analysis a new convex hull is formed that is lower in energy than those in the Materials Project and Open Quantum Materials Databases. Two previously unreported phases are discovered for the NiTi2 and Ni5Ti compositions, and two metastable states in NiTi and NiTi2 shows signs of negative linear compression and negative Poisson ratio, respectively.We acknowledge the computational resources awarded by XSEDE, a project supported by National Science Foundation Grant No. ACI-1053575. We acknowledge the support from the Texas Advances Computer Center (with the Stampede2 and Bridges supercomputers). This work was supported by the DMREF-NSF 1434897, NSF OAC-1740111, and DOE DE-SC0021375 projects. M.J.V. acknowledges funding by the Belgian FNRS (PDR G.A. T.1077.15-1/7, T.0103.19, and a sabbatical “OUT” grant at ICN2), ULiege, and the Communauté Française de Belgique (ARC AIMED G.A. 15/19-09) and computational resources from the Consortium des Equipements de Calcul Intensif (FRS-FNRS G.A. 2.5020.11) and Zenobe/CENAERO funded by the Walloon Region under G.A. 1117545

Production of He-4 and (4) in Pb-Pb collisions at root(NN)-N-S=2.76 TeV at the LHC

Results on the production of He-4 and (4) nuclei in Pb-Pb collisions at root(NN)-N-S = 2.76 TeV in the rapidity range vertical bar y vertical bar <1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0-10% central events are found to be dN/dy4(He) = (0.8 +/- 0.4 (stat) +/- 0.3 (syst)) x 10(-6) and dN/dy4 = (1.1 +/- 0.4 (stat) +/- 0.2 (syst)) x 10(-6), respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T-chem = 156 MeV) as for light hadrons. The measured ratio of (4)/He-4 is 1.4 +/- 0.8 (stat) +/- 0.5 (syst). (C) 2018 Published by Elsevier B.V.Peer reviewe

Propuesta pedagógica de educación sexual para adolescentes del Colegio de Ciencias y Humanidades número 5, plantel Sur (CCH-Sur) de la Universidad Nacional Autónoma de México (UNAM)

Licenciatura en Pedagogí

Λc\Lambda_{c}/D0D^{0} ratio on high multiplicity pp collisions at LHC

High multiplicity pp collisions had shown signals of the possible formation of a collective state on which the clustering color sources give a natural description of the production of strong color fields due to the partonic interactions. We explore the production of Lambda_{c}/D^{0} ratio on high multiplicity pp collisions as a consequence of the production of heavy flavors and the early time dynamics of the collisions

Evolution of the pp total cross-section, through a grey disk, from the LHC energies to the limit of asymptotic energy

By using the interplay between the growth of the transverse size of the protonin the high energy limit and the gluonic matter density, with unitarity saturation, we use the Grey Disc parametrization to explore the evolution of the cross section at very high energies

Study of the Global Temperature Fluctuations in pp collisions at LHC energies

Under the extreme conditions of ultrarelativistic pp collisions, free gluons and quarks can form a state of matter called the Quark-Gluon-Plasma. String Percolation Theory can describe quantitatively the phase transition that forms the collectivity. Within the model strings are representations of the interactions between quarks and they form clusters that reach a critical density that suggests the formation of QGP. In this work we study the Global Temperatures assigned to pp collisions at center-of-mass energies $\sqrt{s}$ = 0.9, 2.76, 7 and 13 TeV for several multiplicity classes. We found the universal behavior of Global Temperatures as the multiplicity increases, regardless of the center-of-mass energy of the collision