Sensitivity of T20 indA ?PX to the reaction mechanism and relativistic effects

Abstract

A method for the analysis of interactions between fast deuterons and nucleons is developed, taking into account both the relativistic effects in the deuteron and the mechanism of their interaction. The inclusive proton spectra and the polarisation characteristics are investigated, taking for instance the fragmentation type processes of deuterons on nucleons. A strong sensitivity of the deuteron polarisation tensor component T2o both to the reaction mechanism and to the relativistic structure of the deuteron is shown. It is shown that there can't be a direct indication of the 6q-state existence in the deuteron from the T2o experimental data. PACS: 25.45.Dc

Sensitivity of cross section andT 20 to secondary interactions in the reaction indp ? ppn at medium energies

“…In particular, secondary interaction in channels Ip1,3S 1 --3DI, and 3D 2 has a certain influence on the invariant cross section and corrects substantially the behaviour of the tensor asymmetry T20 in a medium energy region. We note here that similar conclusions have been made for the inclusive deuteron breakup at higher energies [5,6] and also for the processes of the deuteron electrodisintegration [25]. The strong influence of the second order graphs have been emphasized also in [13], where a different method of evaluation have been used.…”

“…Ignatenko and Lykasov [5] have presented calculations indicating that the pion production may be responsible for the deviations in the cross section. Later calculations [6] have also shown a considerable influence of corresponding triangle diagrams on T2o.…”

“…Measured cumulative protons were produced in the collision of the deuteron beam with ~2C or protons. The interpretation is carried out mainly with an aim of investigating the deuteron wave function (DWF) at medium and small distances [3][4][5][6]. While applicability of the impulse approximation (IA) was donfirmed for the small internal momenta of nucleons in deuteron, a marked deviation from the IA predictions based on known deuteron wave functions was shown in the region of the bigger ones.…”

The Deuteron: Structure and Form Factors

“…In reality, final state interactions and pion production alter significantly the interpretation of these experiments (see e.g. [208]). The polarization transfer from vector polarized deuterons to the fast protons has also been measured up to k ≃ 600 MeV/c.…”

Polarization observables in A(d,p) breakup and quark degrees of freedom in the deuteron

“…Following this idea, the MS was often "forgotten" in different theoretical models; for example, in estimations of some reaction mechanisms beyond IA [16], model incorporation of quasi-free channels [17], reduced matrix elements in QCD [18], calculations within the Bethe-Salpeter formalism [19], contribution of quark exchange (QE) in the deuteron [20], etc. Direct calculations of MS effects in the DCS demonstrated that it does not change the universal A 2/3 dependence of the DCS and cannot explain experimental data without modification of the deuteron wave function (DWF) at short distances [2].…”