Zobrazeno 1 - 10
of 146
pro vyhledávání: '"Abu-Raddad L"'
Publikováno v:
Phys.Rev.C72:035208,2005; Erratum-ibid.C73:049903,2006
The mass of the nucleon is studied in a chiral quark-diquark model. Both scalar and axial-vector diquarks are taken into account for the construction of the nucleon state. After the hadronization procedure to obtain an effective meson-baryon Lagrangi
Externí odkaz:
http://arxiv.org/abs/hep-ph/0408312
Publikováno v:
Phys.Rev.C68:024601,2003
We investigate the sensitivity of the differential cross section, recoil nucleon polarization and the photon asymmetry to changes in the elementary amplitude, medium modifications of the resonance $(S_{11},D_{13})$ masses, as well as nuclear target e
Externí odkaz:
http://arxiv.org/abs/nucl-th/0306074
Autor:
Abu-Raddad, L. J.
Publikováno v:
Phys.Rev. C66 (2002) 064601
We present in this article an optical potential for the $\pi$-nucleus interaction that can be used in various studies involving $\pi$-nucleus channels. Based on earlier treatments of the low energy $\pi$-nucleus optical potential, we have derived a p
Externí odkaz:
http://arxiv.org/abs/nucl-th/0211028
Autor:
Abu-Raddad, L. J.
Publikováno v:
AIP Conf.Proc.631:221-228 ,2003
The nucleon structure and the nuclear force are investigated in the context of the non-perturbative path-integral method of hadronization. Starting from a microscopic quark-diquark model, the nucleon is generated as a relativistic bound state and an
Externí odkaz:
http://arxiv.org/abs/nucl-th/0211029
Publikováno v:
Phys.Rev. C66 (2002) 025206
Nucleon structure and the origin and nature of the nuclear force are investigated in the context of a QCD-based effective field theory and the path-integral method of hadronization. We start from a microscopic model of quarks and diquarks where the g
Externí odkaz:
http://arxiv.org/abs/nucl-th/0206002
Autor:
Abu-Raddad, L. J., Piekarewicz, J.
We have developed a relativistic formalism for studying quasi-free processes from nuclei. The formalism can be applied with ease to a variety of processes and renders transparent analytical expressions for all observables. We have applied it to kaon
Externí odkaz:
http://arxiv.org/abs/nucl-th/0206003
Publikováno v:
AIP Conf.Proc.631:191-220 ,2003
We present a simple introduction to the techniques of effective field theory (EFT) and their application to QCD. For problems with more than one energy scale, the EFT approach is a useful alternative to more traditional model-building strategies. The
Externí odkaz:
http://arxiv.org/abs/nucl-th/0205058
Autor:
Abu-Raddad, L. J., Piekarewicz, J.
Publikováno v:
Phys.Rev. C64 (2001) 064616
The spectral function of He-4 is extracted from a plane-wave approximation to the (e,e'p) reaction using a fully relativistic formalism. We take advantage of both an algebraic ``trick'' and a general relativistic formalism for quasifree processes dev
Externí odkaz:
http://arxiv.org/abs/nucl-th/0106015
Autor:
Abu-Raddad, L. J., Piekarewicz, J.
Publikováno v:
Phys.Rev. C61 (2000) 014604
We compute the recoil polarization of the lambda-hyperon and the photon asymmetry for the quasifree photoproduction of kaons in a relativistic impulse-approximation approach. Our motivation for studying polarization observables is threefold. First, p
Externí odkaz:
http://arxiv.org/abs/nucl-th/9906066
Publikováno v:
Phys.Rev. C60 (1999) 054606
We study the coherent photoproduction of pseudoscalar mesons---particularly of neutral pions---placing special emphasis on the various sources that put into question earlier nonrelativistic-impulse-approximation calculations. These include: final-sta
Externí odkaz:
http://arxiv.org/abs/nucl-th/9812061