scholarly journals Higher-order relativistic corrections to gluon fragmentation into spin-triplet S-wave quarkonium

2012 ◽  
Vol 2012 (11) ◽  
Author(s):  
Geoffrey T. Bodwin ◽  
U-Rae Kim ◽  
Jungil Lee
Keyword(s):  
Higher Order ◽  
S Wave ◽  
Relativistic Corrections ◽  
Spin Triplet ◽  
Gluon Fragmentation

scholarly journals Analytical calculation for the gluon fragmentation into spin-triplet S -wave quarkonium

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
Peng Zhang ◽  
Yan-Qing Ma ◽  
Qian Chen ◽  
Kuang-Ta Chao
Keyword(s):  
Analytical Calculation ◽  
S Wave ◽  
Spin Triplet ◽  
Gluon Fragmentation

EXTRACTING SUB-SURFACE INFORMATION FROM LONG OFFSET P-WAVE DATA—A CHEAPER ALTERNATIVE TO MULTICOMPONENT OBC FOR EXPLORATION?

2002 ◽  
Vol 42 (1) ◽  
pp. 627
Author(s):  
R.G. Williams ◽  
G. Roberts ◽  
K. Hawkins
Keyword(s):  
Seismic Energy ◽  
Higher Order ◽  
P Wave ◽  
S Wave ◽  
Additional Information ◽  
Wave Data ◽  
Wave Velocities ◽  
Avo Inversion ◽  
Long Offset ◽  
Multicomponent Data

Seismic energy that has been mode converted from pwave to s-wave in the sub-surface may be recorded by multi-component surveys to obtain information about the elastic properties of the earth. Since the energy converted to s-wave is missing from the p-wave an alternative to recording OBC multi-component data is to examine p-wave data for the missing energy. Since pwave velocities are generally faster than s-wave velocities, then for a given reflection point the converted s-wave signal reaches the surface at a shorter offset than the equivalent p-wave information. Thus, it is necessary to record longer offsets for p-wave data than for multicomponent data in order to measure the same information.A non-linear, wide-angle (including post critical) AVO inversion has been developed that allows relative changes in p-wave velocities, s-wave velocities and density to be extracted from long offset p-wave data. To extract amplitudes at long offsets for this inversion it is necessary to image the data correctly, including correcting for higher order moveout and possibly anisotropy if it is present.The higher order moveout may itself be inverted to yield additional information about the anisotropy of the sub-surface.

scholarly journals Raman Processes in the Helium Atom in Intense Fields

1975 ◽  
Vol 28 (1) ◽  
pp. 35
Author(s):  
RK Thareja ◽  
Man Mohan ◽  
V Nayak ◽  
SN Haque
Keyword(s):  
Helium Atom ◽  
General Expression ◽  
High Intensity ◽  
Transition Amplitude ◽  
Higher Order ◽  
Nonlinear Behaviour ◽  
S Wave ◽  
Intensity Parameter ◽  
Intense Fields ◽  
Hydrogenic Model

Using the hydrogenic model for the helium atom, the amplitude of transition from states He(ls) to He(ls, nl) by absorption of N photons of an intense field together with the emission of one Raman photon is evaluated. From the general expression for the transition amplitude, the particular case of transition from He(ls) to He(ls, 2p) is considered. The 'reduced' transition amplitude is plotted against the number of photons N involved and against the intensity parameter y st;parately. It is found that the s wave contributes maximaly to the transition amplitude. An important feature of the calculations is the appearance of nonlinear behaviour at high intensity. The dominance of higher order processes over lower ones at high intensity is also found.

scholarly journals A CBF calculation of 1S0 Superfluidity in the Inner Crust of Neutron Stars

2019 ◽  
Vol 17 ◽  
pp. 23
Author(s):  
G. Pavlou ◽  
E. Mavrommatis ◽  
Ch. C. Moustakidis ◽  
J. W. Clark
Keyword(s):  
Equation Of State ◽  
Neutron Stars ◽  
Basis Function ◽  
Correlation Functions ◽  
Short Range ◽  
Higher Order ◽  
Neutron Matter ◽  
S Wave ◽  
Short Range Correlations

Singlet S-wave superfluidity of dilute neutron matter in the inner crust of neutron stars is studied within the correlated BCS (Bardeen, Cooper, Schrieffer) method, taking into account both pairing and short-range correlations. First, the equation of state (EOS) of normal neutron matter is calculated within the correlated-basis-function (CBF) method in lowest cluster order using the Argonne V18 and V4′ potentials and Jastrow-type correlation functions. The 1S0 superfluid gap is then calculated with these potentials and correlation functions. The dependence of our results on the choice of the correlation functions is ana- lyzed and the role of higher-order cluster corrections is considered. The values obtained for the 1S0 gap within this simplified scheme are comparable to those from other, more elaborate, methods.

Pseudogap and Unconventional Pairing in the Hubbard Model

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2939-2945 ◽  
Author(s):  
Y. M. Malozovsky ◽  
J. D. Fan
Keyword(s):  
Hubbard Model ◽  
P Wave ◽  
Perturbation Approach ◽  
S Wave ◽  
Orbital State ◽  
Adequate Model ◽  
Hubbard Models ◽  
Spin Singlet ◽  
Spin Triplet ◽  
Spin Response

The attractive (U < 0) and repulsive (U > 0) Hubbard models have been studied using the Fermi liquid perturbation approach. The attractive Hubbard model (U < 0) is an adequate model for 3 He , an incompressible and strongly paramagnetic liquid [Formula: see text], [Formula: see text] for |U|N F = 0.9) with a pseudogap in the charge response. A pairing instability and superfluidity for U < 0 exists in the spin channel only: spin-triplet with l = 0, or spin-singlet with l = 1 (p-wave orbital state j = s + l = 1), where l is the orbital momentum of a pair. The repulsive Hubbard model (U > 0) represents a highly compressible and nearly antiferromagnetic liquid [Formula: see text], [Formula: see text] for UN F = 0.9) with a pseudogap in the spin response. However, for U > 0 a pairing instability and superconductivity exist in the charge channel only: spin-singlet with l = 0 (s-wave), or with l = 2 (d-wave) in the case of an anisotropic Fermi surface.

Origin of the spin-triplet Andreev reflection at ferromagnet/s-wave superconductor interface

2008 ◽  
Vol 103 (2) ◽  
pp. 023921 ◽  
Author(s):  
Cui Di Feng ◽  
Zhi Ming Zheng ◽  
Yi Qun Ji ◽  
Zhi Ping Niu ◽  
D. Y. Xing
Keyword(s):  
Andreev Reflection ◽  
S Wave ◽  
Spin Triplet
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