scholarly journals Azimuthal angle dependence of dijet production in unpolarized hadron scattering

2008 ◽  
Vol 78 (3) ◽  
Author(s):  
Zhun Lu ◽  
Ivan Schmidt
Keyword(s):  
Azimuthal Angle ◽  
Dijet Production ◽  
Angle Dependence

Terahertz emission from GaInAs p-i-n diodes photoexcited by femtosecond laser pulses

2016 ◽  
Vol 55 (4) ◽  
Author(s):  
Ignas Nevinskas ◽  
Sandra Stanionytė ◽  
Vaidas Pačebutas ◽  
Arūnas Krotkus
Keyword(s):  
Femtosecond Laser ◽  
Crystallographic Orientation ◽  
Azimuthal Angle ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Voltage Source ◽  
Terahertz Emission ◽  
External Voltage ◽  
Angle Dependence ◽  
Lattice Matched

Lattice-matched GaInAs p-i-n diodes of different i-region thicknesses have been MBE grown on n-type InP (100) and (111) crystallographic orientation substrates. It has been found that terahertz emission from such structures when illuminated with femtosecond laser pulses can be more efficient than that from the known to date best surface terahertz emitter (111) p-InAs. The explanation of the terahertz generation mechanism from p-i-n diodes is based on ultrafast photocurrent effects. Anisotropic transient photocurrents causing the 3ϕ azimuthal angle dependence are observed in the sample on (111) substrate. These p-i-n structures allow covering a technologically important 1.55 μm range and may provide controllability and compactness of a THzTDS system when biased with an external voltage source.

Magnetic-field-induced fourfold azimuthal angle dependence in the terahertz radiation power of (100) InAs

2007 ◽  
Vol 90 (15) ◽  
pp. 151915 ◽  
Author(s):  
Elmer Estacio ◽  
Hisashi Sumikura ◽  
Hidetoshi Murakami ◽  
Masahiko Tani ◽  
Nobuhiko Sarukura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Terahertz Radiation ◽  
Radiation Power ◽  
Azimuthal Angle ◽  
Angle Dependence

scholarly journals APPROXIMATE VORTEX SOLUTION OF FADDEEV MODEL

2008 ◽  
Vol 23 (09) ◽  
pp. 1361-1369 ◽  
Author(s):  
CHANG-GUANG SHI ◽  
MINORU HIRAYAMA
Keyword(s):  
Differential Equation ◽  
Ordinary Differential Equation ◽  
Minimum Energy ◽  
Azimuthal Angle ◽  
Static Field ◽  
Angle Dependence ◽  
Approximate Analytic Expression ◽  
Vortex Solution ◽  
Analytic Expression ◽  
Faddeev Model

Through an ansatz specifying the azimuthal-angle dependence of the solution, the static field equation for vortex of the Faddeev model is converted to an algebraic ordinary differential equation. An approximate analytic expression of the vortex solution is explored so that the energy per unit vortex length becomes as small as possible. It is observed that the minimum energy of vortex is approximately proportional to the integer which specifies the solution.

Azimuthal angle dependence of di-jet production in unpolarized hadron scattering

2009 ◽  
Author(s):  
Zhun Lu ◽  
Ivan Schmidt ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
...  
Keyword(s):  
Azimuthal Angle ◽  
Jet Production ◽  
Angle Dependence

scholarly journals Comparison of improved TMD and CGC frameworks in forward quark dijet production

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Hirotsugu Fujii ◽  
Cyrille Marquet ◽  
Kazuhiro Watanabe
Keyword(s):  
Azimuthal Angle ◽  
High Energy ◽  
Color Glass ◽  
Dijet Production ◽  
Proton Proton ◽  
Saturation Scale ◽  
Wide Range ◽  
Factorization Formula ◽  
Leading Term ◽  
Multi Body

Abstract For studying small-x gluon saturation in forward dijet production in high-energy dilute-dense collisions, the improved TMD (ITMD) factorization formula was recently proposed. In the Color Glass Condensate (CGC) framework, it represents the leading term of an expansion in inverse powers of the hard scale. It contains the leading-twist TMD factorization formula relevant for small gluon’s transverse momentum kt, but also incorporates an all-order resummation of kinematical twists, resulting in a proper matching to high-energy factorization at large kt. In this paper, we evaluate the accuracy of the ITMD formula quantitatively, for the case of quark dijet production in high-energy proton-proton(p+p) and proton-nucleus (p+A) collisions at LHC energies. We do so by comparing the quark-antiquark azimuthal angle ∆ϕ distribution to that obtained with the CGC formula. For a dijet with each quark momentum pt much larger than the target saturation scale, Qs, the ITMD formula is a good approximation to the CGC formula in a wide range of azimuthal angle. It becomes less accurate as the jet pt’s are lowered, as expected, due to the presence of genuine higher-twists contributions in the CGC framework, which represent multi-body scattering effects absent in the ITMD formula. We find that, as the hard jet momenta are lowered, the accuracy of ITMD start by deteriorating at small angles, in the high-energy-factorization regime, while in the TMD regime near ∆ϕ = π, very low values of pt are needed to see differences between the CGC and the ITMD formula. In addition, the genuine twists corrections to ITMD become visible for higher values of pt in p + A collisions, compared to p+p collisions, signaling that they are enhanced by the target saturation scale.

Interpretation of azimuthal angle dependence of periodic gratings in Mueller matrix spectroscopic ellipsometry

2015 ◽  
Vol 32 (4) ◽  
pp. 604 ◽  
Author(s):  
Anett Heinrich ◽  
Jörg Bischoff ◽  
Kurt Meiner ◽  
Uwe Richter ◽  
Thomas Mikolajick ◽  
...  
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Azimuthal Angle ◽  
Mueller Matrix ◽  
Angle Dependence ◽  
Periodic Gratings
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