Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Afnan, I. R."'
We investigate the variation with light quark mass of the mass of the nucleon as well as the masses of the mesons commonly used in a one-boson-exchange model of the nucleon-nucleon force. Care is taken to evaluate the meson mass shifts at the kinemat
Externí odkaz:
http://arxiv.org/abs/1208.3009
Autor:
Afnan, I. R., Phillips, Daniel R.
Publikováno v:
Phys.Rev. C69 (2004) 034010
We discuss effective field theory treatments of the problem of three particles interacting via short-range forces. One case of such a system is neutron-deuteron scattering at low energies. We demonstrate that in attractive channels the renormalizatio
Externí odkaz:
http://arxiv.org/abs/nucl-th/0312021
Autor:
Afnan, I. R., Bissey, F., Gomez, J., Katramatou, A. T., Liuti, S., Melnitchouk, W., Petratos, G. G., Thomas, A. W.
Publikováno v:
Phys.Rev.C68:035201,2003
We present a comprehensive analysis of deep inelastic scattering from He-3 and H-3, focusing in particular on the extraction of the free neutron structure function, F_2^n. Nuclear corrections are shown to cancel to within 1-2% for the isospin-weighte
Externí odkaz:
http://arxiv.org/abs/nucl-th/0306054
Autor:
Afnan, I. R., Lahiff, A. D.
The Bethe-Salpeter (BS) amplitude for $\pi N$ scattering is evaluated at the off mass shell points corresponding to the Low Energy Theorems (LET) based on PCAC and current algebra. The results suggest a way of maintaining consistency between BS equat
Externí odkaz:
http://arxiv.org/abs/nucl-th/0210027
Autor:
Afnan, I. R., Gibson, B. F.
An OBE potential model for the ^{1}S_0 S = -2 interaction is analyzed with emphasis on the role of coupling between the Lambda Lambda, N Xi, and Sigma Sigma channels. Singlet scalar exchange, an approximation to two-pion exchange, is significant in a
Externí odkaz:
http://arxiv.org/abs/nucl-th/0207058
Autor:
Lahiff, A. D., Afnan, I. R.
Publikováno v:
Phys.Rev. C66 (2002) 044001
We investigate the relation between different three-dimensional reductions of the Bethe-Salpeter equation and the analytic structure of the resultant amplitudes in the energy plane. This correlation is studied for both the $\phi^2\sigma$ interaction
Externí odkaz:
http://arxiv.org/abs/nucl-th/0205076
Autor:
Lahiff, A. D., Afnan, I. R.
Publikováno v:
PiN Newslett. 16 (2002) 92-97
A covariant model of elastic pion-nucleon scattering based on the Bethe-Salpeter equation is presented. We obtain a good description of the S- and P-wave phase shifts up to 360 MeV laboratory energy. We also compare results from the K-matrix approach
Externí odkaz:
http://arxiv.org/abs/nucl-th/0109054
Publikováno v:
Phys.Rev.C64:024004,2001
The spectral functions and light-cone momentum distributions of protons and neutrons in 3He and 3H are given in terms of the three-nucleon wave function for realistic nucleon-nucleon interactions. To reduce computational complexity, separable expansi
Externí odkaz:
http://arxiv.org/abs/nucl-th/0012081
Autor:
Petratos, G. G., Afnan, I. R., Bissey, F., Gomez, J., Katramatou, A. T., Melnitchouk, W., Thomas, A. W.
We discuss a possible measurement of the ratio of the nucleon structure functions, F2n/F2p, and the ratio of the up to down quark distributions, u/d, at large x, by performing deep inelastic electron scattering from the 3H and 3He mirror nuclei with
Externí odkaz:
http://arxiv.org/abs/nucl-ex/0010011
Publikováno v:
Phys.Lett.B493:288-292,2000
We study deep inelastic scattering on isospin asymmetric nuclei. In particular, the difference of the nuclear structure functions and the Gottfried sum rule for the lightest mirror nuclei, 3He and 3H, are investigated. It is found that such systems c
Externí odkaz:
http://arxiv.org/abs/nucl-th/0008017