The production and event topology of three-jet events produced in {ital p{bar p}} collisions at {radical}{ital s} =1.8 TeV have been studied with the Collider Detector at Fermilab at the Tevatron ...Collider. The distributions of the three-jet angular variables ({psi}{sup *} and cos{theta}{sup *}) and of the variables describing the energy sharing between jets ({ital x}{sub 3} and {ital x}{sub 4}) are found to agree well with tree-level QCD calculations. These distributions are predicted to have different shapes for different initial-state subprocesses (quark-antiquark, quark-gluon, and gluon-gluon). The data are consistent with the small expected contribution from quark-antiquark initial states, in agreement with theoretical expectations.
The structural and nonlinear optical properties of the Schiff base material, (
E
)-4-fluoro-
N
′-(pyridin-2-ylmethylene)benzohydrazide monohydrate (FPMBH) were studied. The experimental ...investigations were performed using Fourier transform infrared (FTIR), ultraviolet (UV) and nuclear magnetic resonance (NMR) spectral techniques. The computational analyses were made by DFT method. A comparison between experimental and theoretical predictions was made and interpreted. The maximum absorption wavelength was found by both experimental and theoretical analyses. The Hirshfeld surface analysis was performed to understand the various molecular interactions. Highest occupied and lowest unoccupied molecular orbitals (HOMO–LUMO) analysis was performed for the title molecule to know about the possible charge transfer taking place within the molecule. Reactivity features were also determined by molecular electrostatic potential (MEP) analysis. The third-order nonlinear optical studies were done by z-scan experiment, and the results were discussed.
We present new precision measurements of the elastic electron-proton scattering cross section for momentum transfer (Q^{2}) up to 15.75 (GeV/c)^{2}. Combined with existing data, these provide an ...improved extraction of the proton magnetic form factor at high Q^{2} and double the range over which a longitudinal or transverse separation of the cross section can be performed. The difference between our results and polarization data agrees with that observed at lower Q^{2} and attributed to hard two-photon exchange (TPE) effects, extending to 8 (GeV/c)^{2} the range of Q^{2} for which a discrepancy is established at >95% confidence. We use the discrepancy to quantify the size of TPE contributions needed to explain the cross section at high Q^{2}.
A measurement of the QCD jet-broadening parameter {l angle}{ital Q}{sub {ital T}}{r angle} is described for high-{ital E}{sub {ital T}} jet data in the central calorimeter of the Collider Detector at ...Fermilab. This method involves the use of a global event parameter which is free from the ambiguities associated with the definition and separation of individual clusters. The parameter {ital Q}{sub {ital T}} is defined as the scalar sum of the transverse momentum perpendicular to the transverse thrust axis. Parton-level QCD predictions are made for {l angle}{ital Q}{sub {ital T}}{r angle} as a function of {ital E}{sub {ital T}}, the total transverse energy in the events, and suggest that a measurement would show a dependence on the running of the strong coupling constant {alpha}{sub {ital s}}. Comparisons are made to first-order QCD parton-level calculations, as well as to fully evolved and hadronized leading-log simulations.
