[en] Measurements of tensor analyzing powers T²₀, T²₁ and T²₂ for inelastic photo pion reactions on deuteron have been measured in recent years. The photo production of pions from deuterons was studied theoretically under Impulse Approximation using a phenomenological approach as early as 1951. The problem was also studied using the well known CGLN photo production amplitudes. A statistical modelling was used currently to analyse some of the recent measurements. The reaction amplitude was calculated using the model described in. The purpose of the present contribution is to outline a Model Independent theoretical approach to inelastic photo pion production on deuteron using irreducible tensor techniques

[en] The purpose of this contribution is to present a model independent theoretical study of the analyzing powers in p^→p^→ → pΔ⁺. We supplement the analysing powers to the unpolarized differential cross-section in Δ production amplitudes

[en] Experimental and theoretical study of pp → ppπ⁰ has excited considerable interest, ever since the total cross section measurements were found to be more than 5 times larger than the then existing theoretical predictions. Advances in technology led to experimental studies employing a polarized beam on a polarized target. The purpose of the present paper is to show how the reaction amplitudes may be related to each other

[en] The polarization and spin correlation measurements on protons in the final state enables to determine the partial wave amplitudes along with their relative phases. The final state polarization of two protons have been studied theoretically and the utility of such measurements to determine the six amplitudes free from any discrete ambiguities are examined

[en] Measurements of the total cross section for pp → ppπ⁰ had generated considerable amount of excitement, as they were found to be more than five times the then available theoretical predictions. The purpose of the present contribution is to use a model independent irreducible tensor formalism to discuss the final state spin polarization in pp → pΔ⁺

[en] The experimental and theoretical study of pp → pp π"0 has excited considerable attention, ever since the total cross section measurements were found to be more than five times larger than the then existing theoretical predictions. Advances in technologies led to complete identification of the three body final state and to measurements employing polarized beam on a polarized target. Many of the early theoretical attempts tried to bridge the gap by introducing several mechanisms taking into account only the lowest partial waves. The Julich meson exchange model which took into consideration higher partial waves as well was however found to be inadequate to provide an overall satisfactory reproduction of the data on p-barp-bar → ppπ"0. The purpose of the present contribution is to take into account Sd and Ds channels in pp → ppπ"0 improve the discussion and correlate the resulting pp → p Δ"+p and pp →ppπ"0 amplitudes, so that the importance of Δ contributions can be studied in more detail using the model independent approach

[en] Pion production in NN collisions is not only sensitive to short range NN interaction, but includes also NN transitions between singlet and triplet spin states, which are forbidden in elastic scattering. At threshold energies, participation of only a few partial waves in the final state is involved, which in turn limit the initial partial waves through Parity conservation and Pauli principle. Ever since the total cross section measurements for pp → ppπ"0 were found to be more than a factor of 5 larger than the then available theoretical predictions, experimental and theoretical study of the reaction excited considerable interest. Advances in storage ring technology led to detailed experimental studies including measurements when both the colliding protons are polarised. Theoretical models including the more advanced Julich meson exchange model failed to provide an overall satisfactory reproduction of the data. A model independent approach developed earlier was employed to analyse the findings of the Julich model. This study identified not only some of the short comings of the model, but also revealed that the Δ contributions are important. It was pointed out subsequently that there was a phase ambiguity in and it was shown how this drawback can be removed through additional measurements of spin observables

[en] In view of current experimental interest, a model independent theoretical approach was developed to study pp → ppω, where the polarization of ω offers itself as an important spin observable

[en] Model-independent formulas are derived for the polarizations and spin correlations of protons in the final state of pp→ppω, taking into consideration all six threshold partial wave amplitudes, f₁,...,f₆, covering the Ss,Sp, and Ps channels. It is shown that these measurements of the final state spin observables, employing only an unpolarized beam and an unpolarized target, can be utilized to complement measurements at the double-differential level suggested earlier [J. Balasubramanyam, Venkataraya, and G. Ramachandran, Phys. Rev. C 78, 012201(R) (2008)] so that all six partial wave amplitudes can be determined empirically.

[en] With the advent of high energy hadron accelerators, experimental data on the total and differential cross-sections have been made available for pp-> ppω, which is of considerable interest to study hadron interactions at short distances. A model independent approach to the analysis of such data is presented