Intranuclear Cascade versus Eikonal Approximation Typeset Using Revt E X 2
نویسندگان
چکیده
The problem of nucleon propagation through the nuclear medium in quasielastic A(e, e ′ p) reactions is discussed in the kinematic range 1 ≤ Q 2 ≤ 7 (GeV/c) 2. Experimental data are available from SLAC, BATES and, recently, also from TJNAF. The coefficient of nuclear transparency is calculated for each Q 2 in the framework of the intranuclear cascade model (INC) and of the eikonal approximation (EA). The former has the capability of directly implementing the detector acceptances giving a very detailed analysis of the 1 different observables. The latter, essentially based on an exclusive mechanism , contains explicit information about the dependence on the target shell structure. The predictions of both models are in good agreement with each other. The INC model reproduces the experimental data quite well in the measured range. The EA gives an explanation of the Q 2 behaviour of the transparency coefficient as a kinematic effect related to the superposition of contributions from each target shell.
منابع مشابه
Infrared Divergences and Non-lightlike Eikonal Lines in Sudakov Processes Typeset Using Revt E X 1
We propose a method to analyze infrared contributions to non-inclusive processes in QCD. We use the one-loop Sudakov form factor as a working example. Borrowing techniques from renormalization theory, we construct coun-terterms for the contributions from the soft and collinear regions, and we relate them to eikonal Wilson lines taken along non-lightlike directions.
متن کاملAntikaon Flow in Heavy-ion Collisions: Effects of Absorption and Mean-field Potential * Typeset Using Revt E X
We study antikaon flow in heavy-ion collisions at SIS energies based on the relativistic transport model (RVUU 1.0). The production of antikaons from both baryon-baryon and pion-baryon collisions are included. Taking into account only elastic and inelastic collisions of the antikaon with nucleons and neglecting its mean-field potential as in the cascade model, a strong antiflow or anti-correlat...
متن کاملTrajectory versus Probability Density Entropy Typeset Using Revt E X 1
We study the problem of entropy increase of the Bernoulli-shift map without recourse to the concept of trajectory and we discuss whether, and under which conditions if it does, the distribution density entropy coincides with the Kolmogorov-Sinai entropy, namely, with the trajectory entropy. 05.45.+b,03.65.Sq,05.20.-y Typeset using REVTEX 1
متن کاملEeective Lagrangians and Low Energy Photon-photon Scattering Typeset Using Revt E X 1
We investigate the behavior of the photon-photon scattering near the threshold ! = m e , by comparing the exact result with the approximation obtained using the Euler-Heisenberg eeective Lagrangian supplemented with higher-order derivative corrections. We also examine the ! 2 =m 2 e behavior predicted by including one-loop corrections to the Euler-Heisenberg eeective Lagrangian together with th...
متن کامل