Engineering topics
Zhang, F.
Publications and source records attributed to Zhang, F..
Pseudorapidity and transverse momentum dependence of flow harmonics in p Pb and PbPb collisions
Not Available
Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at s NN = 5.02 TeV
Not Available
Molecular dynamics simulation of the solid-liquid interface migration in terbium
In this work, we developed a Tb embedded atom method potential which properly reproduces the liquid structure obtained from the ab initio molecular dynamics simulation, the hexagonal close packed (hcp)-body-centered cubic (bcc) phase transformation, and melting temperatures. At least three crystal phases [hcp, face-centered cubic (fcc), and bcc] described by this potential can coexist with the liquid phase. Thus, the developed potential provides an excellent test bed for studies of the completive phase nucleation and growth in a single component system. The molecular dynamics simulation showed that all crystal phases can grow from the liquid phase close to their melting temperatures. However, in the cases of the hcp and fcc growth from the liquid phase at very large supercoolings, the bcc phase forms at the solid-liquid interface in the close packed orientations in spite of the fact that both hcp and fcc phases are more stable than the bcc phase at these temperatures. Finally, this bcc phase closes the hcp and fcc phase from the liquid such that the remaining liquid solidifies into the bcc phase. The initial hcp phase then slowly continues growing in expense of the bcc phase.
Search for a massive resonance decaying to a pair of Higgs bosons in the four b quark final state in proton–proton collisions at s = 13 TeV
Not Available
Search for excited quarks of light and heavy flavor in γ + jet final states in proton–proton collisions at s = 13 TeV
Not Available
Measurement of angular parameters from the decay B0 → K⁎0μ+μ− in proton–proton collisions at s = 8 TeV
Not Available
Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton–proton collisions at s = 13 TeV
Not Available
Nuclear modification factor of D 0 mesons in PbPb collisions at s NN = 5.02 TeV
The transverse momentum ( p T ) spectrum of prompt D 0 mesons and their antiparticles has been measured via the hadronic decay channels D 0 → K – π + and D - 0 → K + π – in p p and PbPb collisions at a centre-of-mass energy of 5.02 TeV per nucleon pair with the CMS detector at the LHC. The measurement is performed in the D 0 meson p T range of 2–100 GeV/ c and in the rapidity range of | y | < 1 . The p p (PbPb) dataset used for this analysis corresponds to an integrated luminosity of 27.4 pb –1 (530 μb –1 ). The measured D 0 meson p T spectrum in pp collisions is well described by perturbative QCD calculations. The nuclear modification factor, comparing D 0 meson yields in PbPb and p p collisions, was extracted for both minimum-bias and the 10% most central PbPb interactions. For central events, the D 0 meson yield in the PbPb collisions is suppressed by a factor of 5–6 compared to the p p reference in the p T range of 6–10 GeV/ c . For D 0 mesons in the high- p T range of 60–100 GeV/ c , a significantly smaller suppression is observed. The results are also compared to theoretical calculations.
X-ray ptychography using randomized zone plates
Not Available
The Influence of Annealing Temperature and Time on the Formation of δ-Phase in Additively-Manufactured Inconel 625
Abstract not provided
Measurement of quarkonium production cross sections in pp collisions at s = 13 TeV
Not Available
Search for gauge-mediated supersymmetry in events with at least one photon and missing transverse momentum in pp collisions at s = 13 TeV
A search for gauge-mediated supersymmetry (SUSY) in final states with photons and large missing transverse momentum is presented. The data sample of pp collisions at $\sqrt{s} = $ 13 TeV was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. Data are compared with models in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape detection. The event selection is optimized for both electroweak (EWK) and strong production SUSY scenarios. The observed data are consistent with standard model predictions, and limits are set in the context of a general gauge mediation model in which gaugino masses up to 980 GeV are excluded at 95% confidence level. Gaugino masses below 780 and 950 GeV are excluded in two simplified models with EWK production of mass-degenerate charginos and neutralinos. Stringent limits are set on simplified models based on gluino and squark pair production, excluding gluino (squark) masses up to 2100 (1750) GeV depending on the assumptions made for the decay modes and intermediate particle masses. This analysis sets the highest mass limits to date in the studied EWK models, and in the considered strong production models when the mass difference between the gauginos and the squarks or gluinos is small.
Search for new long-lived particles at s = 13 TeV
Not Available
Search for supersymmetry in events with one lepton and multiple jets exploiting the angular correlation between the lepton and the missing transverse momentum in proton–proton collisions at s = 13 TeV
Not Available
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in p Pb and PbPb collisions at the CERN Large Hadron Collider
Not Available
A self-contained algorithm for determination of solid-liquid equilibria in an alloy system
In this paper, we describe a self-contained procedure to evaluate the free energy of liquid and solid phases of an alloy system. The free energy of a single-element solid phase is calculated with thermodynamic integration using the Einstein crystal as the reference system. Then, free energy difference between the solid and liquid phases is calculated by Gibbs-Duhem integration. The central part of our method is the construction of a reversible alchemical path connecting a pure liquid and a liquid alloy to calculate the mixing enthalpy and entropy. We have applied the method to calculate the free energy of solid and liquid phases in the Al-Sm system. Finally, the driving force for fcc-Al nucleation in Al-Sm liquid and the melting curve for fcc-Al and Al 3 Sm are also calculated.