« Qaṣīde-ye būy-e jūy-e mūliyān ». Nāmvāre-ye Doktor Maḥmūd Afšār, Bonyād-e mowqūfāt-e Doktor Maḥmūd Afšār, vol. 11, 1998, pp. 5637-5645.

Tests of Quantum Chromodynamics in Exclusive E+e-and Ye Processes*

One of the most, important area.s of investigation in quantum chromodynamics are few-hod3, exclusive reactions initiated by electromagnetic initial states. such as e'e-i HH t+tt-> + ?H. and the two-photon processes 77-+ Hfi shown in Fig. 1. The simplicity. of the photon's couplings to the quark currents and the a.bsence of initial state hadronic interactions allows one to st,ud>. the process of...

Probing nucleon-nucleon correlations with (e,e ′ p) and (e,e ′ pp) reactions

Correlations Measured in 3 He ( e , e ′ pp ) n

Tensor correlations measured in 3He(e,e' pp)n.

We have measured the 3He(e,e' pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of pp to pn pairs as a function of pair total momentum p(tot). For pair relative momenta between 0.3 an...

e+e− production from pp reactions at BEVALAC energies

We have performed a detailed study of dilepton production from pp collisions including the subthreshold ρ production via baryonic resonances (N(1520), N(1700)) in addition to the conventional dilepton sources as π0, η, ω and ∆ Dalitz decays and direct decays of vector mesons (ρ, ω). The role of baryonic resonances in ρ production from nucleon-nucleon collisions is studied in comparison to the D...