We study the theoretical predictions for the total inelastic \(\gamma \gamma\) cross-sections, with an emphasis on the eikonalised minijet model (EMM). In the context of the EMM, we discuss a new ...ansatz for the overlap function involving the photons. We discuss the dependence of the EMM predictions on various input parameters as well as predictions for \siggg from a simple extension of the Regge Pomeron Exchange model. We then compare both with the recent LEP data.
We discuss predictions for the total inelastic gamma-gamma cross-section and their model dependence on the input parameters. We compare results from a simple extension of the Regge Pomeron exchange ...model as well as predictions from the eikonalized mini-jet model with recent LEP data.
The number and proportion of motoneurons and interneurons present in the rat abducens nucleus was determined by the use of ChAT immunostaining and of HRP staining after retrograde transport from the ...injected right lateral rectus muscle. After HRP injection 67% of abducens neurons took up HRP and were hence motoneurons to the muscle. The cell bodies were mainly located in the middle third of the nucleus and were either spindle-shaped or pyriform. By ChAT-immunohistochemistry, 77% of the rat abducens neurons were ChAT-positive. After considering and discarding the hypotheses that the lateral rectus muscle could be incompletely filled by HRP, and that other muscles may be innervated by abducens motoneurons, it is concluded that some interneurons of the abducens nucleus of the rat are probably cholinergic.
In this note we assess the validity and uncertainties in the predictions of the eikonalised mini-jet model for \(\sigma^{inel}_{\gamma \gamma}\). We are able to find a choice of parameters where the ...predictions are compatible with the current data. Even for this restricted range of parameters the predictions at the high c.m. energies, which can be reached at the TeV energy \(e^+e^-\) colliders, differ by about \(\pm 25\%\). LEP 2 data can help pinpoint these parameters and hence reduce the uncertainties in the predictions.
Predictions for total inelastic cross-sections for photon induced processes
are discussed in the context of the QCD-inspired minijet model. Large
theoretical uncertainties exist, some of them related ...to the parton
distributions of hadrons in impact parameter space. A model for such
distribution is presented, based on soft gluon summation. This model
incorporates (the salient features of distributions obtained from) the
intrinsic transverse momentum behaviour of hadrons. Under the assumption that
the intrinsic behaviour is dominated by soft gluon emission stimulated by the
scattering process, the b-spectrum becomes softer and softer as the scattering
energy increases. In minijet models for the inclusive cross-sections, this will
counter the increase from $\sigma_{jet}$ .
Predictions for total inelastic cross-sections for photon induced processes are discussed in the context of the QCD-inspired minijet model. Large theoretical uncertainties exist, some of them related ...to the parton distributions of hadrons in impact parameter space. A model for such distribution is presented, based on soft gluon summation. This model incorporates (the salient features of distributions obtained from) the intrinsic transverse momentum behaviour of hadrons. Under the assumption that the intrinsic behaviour is dominated by soft gluon emission stimulated by the scattering process, the b-spectrum becomes softer and softer as the scattering energy increases. In minijet models for the inclusive cross-sections, this will counter the increase from \(\sigma_{jet}\) .
