STUDY OF BFKL GLUON DYNAMICS IN HEAVY QUARKONIUM PHOTOPRODUCTION AT HERA

2000 ◽  
Vol 15 (10) ◽  
pp. 695-707 ◽  
Author(s):  
A. V. LIPATOV ◽  
N. P. ZOTOV
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Cross Section ◽  
Gluon Distribution ◽  
Heavy Quarkonium ◽  
Unintegrated Gluon ◽  
Gluon Distributions ◽  
Theoretical Results

In the framework of semihard QCD approach we consider the processes of inelastic heavy quarkonium photoproduction at HERA with emphasis on the BFKL dynamics of gluon distributions. We investigate the dependences of the total cross-section of inelastic J/Ψ photoproduction and also pT and z spectra on different forms of the unintegrated gluon distribution. It is shown that the total cross-section is most sensitive to the Pomeron intercept parameter Δ. We compare the theoretical results with the available H1 and ZEUS experimental data.

scholarly journals HEAVY QUARK PHOTOPRODUCTION IN THE SEMIHARD QCD APPROACH AND THE UNINTEGRATED GLUON DISTRIBUTION

2000 ◽  
Vol 15 (28) ◽  
pp. 1727-1738 ◽  
Author(s):  
A. V. LIPATOV ◽  
V. A. SALEEV ◽  
N. P. ZOTOV
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Heavy Quark ◽  
Cross Section ◽  
Gluon Distribution ◽  
Unintegrated Gluon ◽  
Gluon Distributions ◽  
Theoretical Results

Processes of heavy quark photoproduction at HERA energies are considered using the semihard (k⊥ factorization) QCD approach with emphasis of the BFKL dynamics of gluon distributions. We investigate the dependences of the total cross-section of heavy quark photoproduction and also the pT distribution on different forms of the unintegrated gluon distribution. We present a comparison of the theoretical results with available H1 and ZEUS experimental data for charm and beauty photoproductions.

In-Plane Vibrations of Thick Circular Rings With T or I Cross Sections

1979 ◽  
Vol 46 (2) ◽  
pp. 470-472
Author(s):  
H. Lecoanet ◽  
J. Piranda
Keyword(s):  
Experimental Data ◽  
Eigenvalue Problem ◽  
Cross Section ◽  
Cross Sections ◽  
Rectangular Cross Section ◽  
Circular Rings ◽  
Theoretical Results ◽  
Good Agreement

This paper deals with the problem of eigenfrequencies and eigenvectors for rings whose cross section may be decomposed in basic rectangular cross sections. The solution is derived from a solution of the in-plane eigenvalue problem for rectangular cross-section thick rings. A good agreement between theoretical results and experimental data is obtained.

Total Scattering Cross Section of Solids for Cold and Epithermal Neutrons

1984 ◽  
Vol 39 (12) ◽  
pp. 1160-1167 ◽  
Author(s):  
J. R. Granada
Keyword(s):  
Experimental Data ◽  
Solid State ◽  
Total Cross Section ◽  
Cross Section ◽  
Epithermal Neutron ◽  
Debye Model ◽  
Effect Of Temperature ◽  
Epithermal Neutrons ◽  
Total Scattering Cross Section ◽  
Asymptotic Forms

Simple expressions are given which accurately describe the total cross section of solids at cold and epithermal neutron energies. They are intended to provide a consistent procedure for the evaluation of solid state effects, which must be substracted from the experimental data when information is wanted on intrinsic nuclear properties. The formulae presented here are the asymptotic forms to which the full expressions reduce in those energy limits. A Debye model is adopted to describe the frequency spectrum of the solid. The present results are compared with some commonly used expressions as well as with the exact formalism. The effect of temperature is discussed and numerical calculations are presented for some cases.

Production of 67Cu by enriched 70Zn targets: first measurements of formation cross sections of 67Cu, 64Cu, 67Ga, 66Ga, 69mZn and 65Zn in interactions of 70Zn with protons above 45 MeV

2020 ◽  
Vol 108 (8) ◽  
pp. 593-602 ◽  
Author(s):  
Gaia Pupillo ◽  
Liliana Mou ◽  
Petra Martini ◽  
Micòl Pasquali ◽  
Alessandra Boschi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cancer Therapy ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
High Intensity ◽  
Chemical Processing ◽  
Γ Spectrometry ◽  
First Time ◽  
Theoretical Results

AbstractDespite its insufficient availability, Copper-67 is currently attracting much attention for its enormous potential for cancer therapy as theranostic radionuclide. This work aims to accurately measure the unexplored cross section 70Zn(p,x)67Cu in the energy range 45–70 MeV and to evaluate its potential advantages in the case of high-intensity proton beams provided by compact cyclotrons. Thin target foils of enriched 70Zn were manufactured by lamination at the INFN-LNL and irradiated at the ARRONAX facility using the stacked-foils method. A radiochemical procedure for the separation of Cu, Ga and Zn contaminants and the isolation of 67Cu from the irradiated material was developed. The efficiency of the chemical processing was determined for each foil by monitoring the activity of selected tracer radionuclides (61Cu, 66Ga and 69mZn) through γ-spectrometry. Experimental data of the 70Zn(p,x)67Cu, 64Cu, 67Ga, 66Ga, 69mZn, 65Zn cross sections were measured for the first time in the energy range 45–70 MeV and compared with the theoretical results obtained by using the TALYS code. The 67Cu production yield by using enriched 70Zn thick targets was compared with the results obtained by using 68Zn targets in the same irradiation conditions.

Electromagnetic scattering by a perfectly conducting elliptic disk

1987 ◽  
Vol 65 (7) ◽  
pp. 723-734 ◽  
Author(s):  
Jonas Björkberg ◽  
Gerhard Kristensson
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Electromagnetic Scattering ◽  
Recurrence Relations ◽  
Scattering Amplitude ◽  
Azimuthal Angle ◽  
Low Frequency ◽  
Prolate Spheroid ◽  
Numerical Computations ◽  
Theoretical Results

Electromagnetic scattering from a perfectly conducting elliptic disk is treated by means of the null-field approach. The disk is obtained as the zero-thickness limit of an ellipsoid. It is shown that in this limit all relevant matrix elements have a well-defined limit. Owing to the lack of axial symmetry, an integral that can not be solved analytically remains in the azimuthal angle. In an appendix, an efficient algorithm to solve these integrals by means of recurrence relations is presented. The formalism is attractive for numerical computations, and stable results for very eccentric disks have been obtained. The first few terms in the low-frequency expansion of the total cross section are derived. Numerical computations of the scattering amplitude and the total cross section illustrate the theoretical results. In a final appendix, the thin wire limit of the elliptic disk is discussed, and a comparison with corresponding results of a prolate spheroid is presented.

2S Excitation of atomic hydrogen by electron impact at high energies

1983 ◽  
Vol 61 (5) ◽  
pp. 748-752 ◽  
Author(s):  
N. Saha
Keyword(s):  
Differential Cross Section ◽  
Total Cross Section ◽  
Electron Impact ◽  
Cross Section ◽  
Differential Cross ◽  
Atomic Hydrogen ◽  
Excitation Cross Section ◽  
High Energies ◽  
Comparison Of The Results ◽  
Theoretical Results

The 2S excitation cross section of atomic hydrogen by electron impact at high energies has been calculated following the method of Das. Comparison of the results for the differential cross section with other theoretical results, and comparison of the results for the total cross section with those of other theories and experiments, shows that the results of the present calculations are fairly accurate.

scholarly journals A study of the process e+ + e−→ e+ + e− + p + p̄ by the two-photon mechanism γγ → pp̄ at high energies

2017 ◽  
Vol 32 (18) ◽  
pp. 1750104 ◽  
Author(s):  
Azad I. Ahmadov
Keyword(s):  
Experimental Data ◽  
Total Cross Section ◽  
Cross Section ◽  
Beam Energy ◽  
Center Of Mass ◽  
Proton Antiproton ◽  
Exclusive Production ◽  
Two Photon ◽  
High Energies ◽  
Energy Formula

In this paper, we consider the exclusive production of proton–antiproton pairs in the interaction between two quasireal photons in [Formula: see text] collision. The differential and total cross-section of the process [Formula: see text] at a beam energy of photons from 2.1 GeV to 4.5 GeV in the center-of-mass and for different values of [Formula: see text] is calculated. At energy [Formula: see text] the total cross-section process of the [Formula: see text] is calculated by the two-photon mechanism. The results are in satisfactory agreement with the experimental data.

scholarly journals SUPERCRITICAL POMERON AND EIKONAL REPRESENTATION OF THE DIFFRACTION SCATTERING AMPLITUDE

1995 ◽  
Vol 10 (26) ◽  
pp. 1959-1967
Author(s):  
S.V. GOLOSKOKOV ◽  
S.P. KULESHOV ◽  
O.V. SELYUGIN
Keyword(s):  
Experimental Data ◽  
Scattering Amplitudes ◽  
Total Cross Section ◽  
Cross Section ◽  
Scattering Amplitude ◽  
Diffraction Scattering ◽  
Eikonal Representation ◽  
The One ◽  
Qcd Pomeron ◽  
Logarithmic Growth

The intercept of the supercritical pomeron is examined with the use of different forms of the scattering amplitudes of the bare pomeron. The one-to-one correspondence between the eikonal phase and the ratio of the elastic and total cross-section is shown. Based on new experimental data of the CDF collaboration, the intercept and power of the logarithmic growth of the bare and total pomeron amplitude are analyzed. It is shown that as a result of the eikonalization procedure, the bare QCD pomeron becomes compatible with experiment.

STRUCTURELESS COMPOSITENESS AND THE LEP W+W- DATA

1998 ◽  
Vol 13 (36) ◽  
pp. 2903-2907
Author(s):  
E. H. LEMKE
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Total Cross Section ◽  
Cross Section ◽  
Quantum Mechanical ◽  
Final State ◽  
Space Factor ◽  
Mechanical Interference ◽  
Phase Space Factor ◽  
Rule Out

We specify the electroweak scenario of structureless compositeness (SC) put forward previously to the case of identical masses m(W±)=m(Φ±) and m(Z)=m(Φ0). The resulting quantum-mechanical interference will exhibit a vector–scalar phase interlocking of exactly π. We calculate the total cross-section of e+e-→ W+W- in this scenario and compare with the SM. The experimental data is found not to rule out any of the four scenarios SM, κ an =0, SC at κ=1 and 0. Pronounced differences between these four cases show up for the σ tot contribution of the W L W L final state. The effects are illustrated in plots free of the trivial phase-space factor.

scholarly journals Elastic scattering of low-energy electrons by OCS molecules.

2000 ◽  
Vol 53 (3) ◽  
pp. 399 ◽  
Author(s):  
M. H. F. Bettega ◽  
M. A. P. Lima ◽  
L. G. Ferreira
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Ab Initio Calculation ◽  
Low Energy ◽  
Low Energy Electrons ◽  
Exchange Approximation ◽  
Low Energy Electron ◽  
Theoretical Results

We report results from an ab initio calculation of low-energy electron scattering by OCS molecules. We used the Schwinger multichannel method with pseudopotentials at the fixed-nuclei static-exchange approximation to calculate elastic integral, differential and momentum transfer cross sections in the energy range from 5 to 50 eV. We compare our results with available theoretical results and experimental data. Through the symmetry decomposition of our integral cross section and eigenphase sum analysis, we found structures in the cross sections that may be interpreted as shape resonances for ∑, ∏ and Δ symmetries. We compared the results for OCS with our previous results on the e––CS2 collision. In particular, we found a similar behaviour in the shape of the symmetry decomposed cross sections of OCS and of CS2 when, for the latter, we sum over the ‘g’ and ‘u’ contributions.

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