scholarly journals π-N Drell-Yan Process in TMD Factorization

2019 ◽  
Vol 2019 ◽  
pp. 1-20
Author(s):  
Xiaoyu Wang ◽  
Zhun Lu
Keyword(s):  
Cross Section ◽  
Point Of View ◽  
Current Understanding ◽  
Theoretical Expression ◽  
Unpolarized Cross Section ◽  
Pion Nucleon ◽  
Kinematical Configuration

This article presents the review of the current understanding on the pion-nucleon Drell-Yan process from the point of view of the TMD factorization. Using the evolution formalism for the unpolarized and polarized TMD distributions developed recently, we provide the theoretical expression of the relevant physical observables, namely, the unpolarized cross section, the Sivers asymmetry, and the cos⁡2ϕ asymmetry contributed by the double Boer-Mulders effects. The corresponding phenomenology, particularly at the kinematical configuration of the COMPASS πN Drell-Yan facility, is displayed numerically.

scholarly journals On the Graph of Divisibility of an Integral Domain

2015 ◽  
Vol 58 (3) ◽  
pp. 449-458 ◽  
Author(s):  
Jason Greene Boynton ◽  
Jim Coykendall
Keyword(s):  
Topological Space ◽  
Integral Domain ◽  
Point Of View ◽  
Current Understanding ◽  
Main Theme ◽  
Topological Graph ◽  
Integral Domains ◽  
Graph Theoretic ◽  
Theoretic Point ◽  
Group Of Divisibility

AbstractIt is well known that the factorization properties of a domain are reflected in the structure of its group of divisibility. The main theme of this paper is to introduce a topological/graph-theoretic point of view to the current understanding of factorization in integral domains. We also show that connectedness properties in the graph and topological space give rise to a generalization of atomicity.

Diagnosing chromospheric magnetic field through simultaneous spectropolarimetry in Hα and Ca II 854.2 nm

2019 ◽  
Vol 15 (S354) ◽  
pp. 46-52
Author(s):  
K. Nagaraju ◽  
K. Sankarasubramanian ◽  
K. E. Rangarajan
Keyword(s):  
Magnetic Field ◽  
Time Evolution ◽  
Opposite Polarity ◽  
Point Of View ◽  
Current Understanding ◽  
Small Scale ◽  
Preliminary Results

AbstractMeasurement of magnetic field in this layer is challenging both from point of view of observations and interpretation of the data. We present in this work about spectropolarimetric observations of a pore, simultaneously in Ca ii (CaIR) at 854.2 nm (CaIR) and H α (656.28 nm). The observed region includes a small scale energetic event (SSEE) taking place in the region between the pore and the region which show opposite polarity to that of pore at the photosphere. The energetic event appears to be a progressive reconnection event as shown by the time evolution of the intensity profiles. Closer examination of the intensity profiles from the downflow regions suggest that the height of formation of CaIR is higher than that of Hi α, contrary to the current understanding about their height of formation. Preliminary results on the inversion of Stokes-I and V profiles of CaIR are also presented.

Pion-nucleon cross-section for absorption and strange particle production at 6.1, 11.6 and 18.1 GeV/c

1964 ◽  
Vol 31 (3) ◽  
pp. 541-549 ◽  
Author(s):  
A. Lloret ◽  
A. Bezaguet ◽  
M. Bloch ◽  
D. Drijard ◽  
D. Morellet ◽  
...  
Keyword(s):  
Cross Section ◽  
Particle Production ◽  
Strange Particle ◽  
Strange Particle Production ◽  
Pion Nucleon

CONTRIBUTIONS TO THE THEORY OF WAVE GUIDES

1949 ◽  
Vol 27a (4) ◽  
pp. 69-69 ◽  
Author(s):  
L. Infeld ◽  
J. R. Pounder ◽  
A. F. Stevenson ◽  
W. Z. Chien ◽  
J. L. Synge
Keyword(s):  
Cross Section ◽  
General Problem ◽  
Radiation Resistance ◽  
Arbitrary Cross Section ◽  
Point Of View ◽  
Wave Guide ◽  
Linear Antenna ◽  
Rectangular Wave ◽  
Point Of Entry ◽  
Wave Guides

Part I deals with the problem of determining the field due to a source of radiation inside a semi-infinite rectangular wave guide closed at one end by a plug, the current distribution in the source being regarded as known. Both the walls of the guide and the plug are treated as being perfectly conducting. Three different methods of solving the problem are given. The radiation resistance is then deduced from energy considerations. In particular, an expression for the radiation resistance of a linear antenna perpendicular to the wider face of the plug, fed at the point of entry, is derived, it being assumed that the antenna current is sinusoidal and that only the fundamental H-wave is transmitted by the guide.In Part II, one of the methods of paper I is extended to the case of a guide of arbitrary cross section, and the general problem of the calculation of radiation resistance and reactance is discussed.In Part III, a number of formulae for the radiation resistance of antennae of various shapes, with various assumed current distributions, in rectangular and circular guides, are given.In Part IV, explicit calculations for the impedance of a linear antenna in a rectangular wave guide are given. Further numerical calculations relating to the same problem, from the point of view of matching and sensitivity, have been made by Messrs. Chien and Pounder, but are not reproduced here.

scholarly journals Measurement of azimuthal asymmetries of the unpolarized cross section at HERMES

2009 ◽  
Author(s):  
Francesca Giordano ◽  
Rebecca Lamb ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
...  
Keyword(s):  
Cross Section ◽  
Unpolarized Cross Section ◽  
Azimuthal Asymmetries

STUDY OF THE η MESON PRODUCTION IN THE $\vec{d}+d\to{}^4He+\eta$ REACTION USING THE POLARIZED BEAM

2007 ◽  
Vol 22 (02n03) ◽  
pp. 523-527
Author(s):  
◽  
M. Lesiak ◽  
M. Abdel-Bary ◽  
A. Budzanowski ◽  
A. Chatterjee ◽  
...  
Keyword(s):  
Cross Section ◽  
Meson Production ◽  
Excess Energy ◽  
Unpolarized Cross Section ◽  
Preliminary Results ◽  
Polarized Beam

The measurement of the η meson production in [Formula: see text] reaction has been performed at the Big Karl magnetic spectograph at COSY synchrotron in Jülich. The vector and tensor polarized deuetron beam at the excess energy of Q=16 MeV was used. The preliminary results for the unpolarized cross section are presented here.

Collapse study of thin-walled polygonal section columns subjected to oblique loads

2007 ◽  
Vol 221 (7) ◽  
pp. 801-810 ◽  
Author(s):  
P Hosseini-Tehrani ◽  
S Pirmohammad
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Rigid Wall ◽  
Point Of View ◽  
Explicit Finite Element ◽  
Thin Walled ◽  
Oblique Load ◽  
Crash Behaviour ◽  
Vehicle Crashworthiness ◽  
Load Conditions

The present paper deals with the collapse simulation of aluminium alloy extruded polygonal section columns subjected to oblique loads. Oblique load conditions in numerical simulations are applied by means of impacting a declined rigid wall on the tubes with no friction in this task. The explicit finite element code LS-DYNA is used to simulate the crash behaviour of polygonal section columns that are undergoing both axial and bending collapse situations. In order to validate LS-DYNA results the collapse procedure of square columns is successfully simulated and the obtained numerical results are compared with actual available experimental data. Mean crush loads and permanent displacements corresponding to load angles have been investigated, considering columns with square, hexagonal, octagonal, decagonal, and circular cross-sections. It is shown that the octagonal cross-section has better characteristics from the point of view of vehicle crashworthiness under oblique load conditions.

scholarly journals Remarks on the anomalous scattering of α-particles from the quantum mechanical point of view

1930 ◽  
Vol 127 (806) ◽  
pp. 671-677 ◽  
Keyword(s):  
Cross Section ◽  
Point Of View ◽  
Light Nuclei ◽  
Fourth Power ◽  
Quantum Mechanical ◽  
Anomalous Scattering ◽  
Particle Scattering ◽  
Scattering Angle ◽  
Coulomb Law ◽  
Α Particles

1. It has been established experimentally by Bieler and Rutherford and Chadwick that α-particle scattering by light nuclei does not obey the Rutherford formula if the velocity of the incident particles be sufficiently large (of the order 2 × 10 9 cm. per second). Bieler showed that the scattering becomes less than the classical value for moderate angles (up to 70° scattering angle), while Rutherford and Chadwick found that it increases again for 135° scattering angle. It is at once obvious that these results indicate a departure from the Coulomb law of force, and various laws have been invoked to explain the devia­tions. Thus Bieler showed how the inverse fourth power law was capable of explaining his results, and he found the radius of the neutral surface of the nucleus to be 3⋅44 × 10 -13 cm. Hardmeier used an inverse fifth power polarisation law and was able to explain the increase again at high velocities. However it is desirable to consider the validity of these calculations from the standpoint of the new mechanics. 2. Dimensional Considerations .—Consider scattering by a centre of force exerting a potential F r -n . This scattering will depend not only on the mass m , and velocity v of the incident particles, and on F, but also on Planck’s constant h . The possible dependence on h is not taken into account in any of the above attempts to explain anomalous scattering. Put the scattering cross section proportional to h s v t m u F w .

Study on the collapse of tapered tubes subjected to oblique loads

2008 ◽  
Vol 222 (11) ◽  
pp. 2025-2039 ◽  
Author(s):  
P Hosseini-Tehrani ◽  
S Pirmohammad ◽  
M Golmohammadi
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Numerical Models ◽  
Point Of View ◽  
Finite Element Code ◽  
Energy Absorber ◽  
Explicit Finite Element ◽  
Bending Deformation ◽  
Oblique Loading

In this work, several antisymmetric tapered tubes with an inner stiffener under axial and oblique loading are studied and optimum dimensions of the tapered tube are derived from a crashworthiness point of view. The importance of detecting these dimensions is optimizing the weight while the crashworthiness of tube is not damaged. By using an internal stiffener, crashworthiness is improved against oblique loads, and the sensitivity of tubes with respect to oblique loads and bending deformation is diminished. The numerical models have been developed using the explicit finite element code LS-DYNA. The crashworthiness of the optimized tapered tube is compared with that of an octagonal-cross-section tube which is known as the best energy absorber model in the literature. It is shown that an optimized tapered tube has an average of 29.3 per cent less crushing displacement in comparison with octagonal-section tube when both tubes have the same weights and the same peaks of crushing load. Finally, the orientation of loading is changed and the best orientation is proposed.

DISTRIBUTION OF ELEMENTS IN HUMAN SPINAL CORD

1992 ◽  
Vol 02 (04) ◽  
pp. 433-440 ◽  
Author(s):  
MASAE YUKAWA ◽  
T. KOBAYASHI ◽  
Y. QIU ◽  
N. KAMEDA ◽  
Y. ITO ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Cross Section ◽  
The Other ◽  
Current Understanding ◽  
Human Spinal Cord ◽  
Lumbar Level ◽  
Distribution Of Elements ◽  
The Cross

The distribution of elements in human spinal cord was investigated on unfixed frozen cord material using PIXE technique. Distribution of Cu, Zn and Fe were not uniform in the cross section of the spinal cord and concentrations of these elements were higher in the anterior gray horn than in the other areas, while K and Cl distributed uniformly. The content of K changed along the spinsl cord from the cervical to the lumbar level. These findings are discussed in relation to current understanding of the physiology of the spinal cord.

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