ON PRODUCTION OF DIRECT PHOTONS AND NEUTRAL PIONS IN RHIC EXPERIMENTS AT $\sqrt{s_{NN}}=200~{\rm GeV}$

Abstract

In continuation of our previous works, we attempt here to understand the nature of data on direct photon and neutral pion production in the latest RHIC experiments at [Formula: see text] for all the different interactions studied therein from the viewpoint of a nonstandard outlook and approach as described in Refs. 4 and 5 here. It is found that the proposed model could account for the data-sets with a fair degree of success.

On Direct Photon Production at RHIC and LHC-energies: A Theoretical Approach

“…The choice of N R would depend on the following factors: (i) the specificities of the interacting projectile and target, (ii) the particularities of the secondaries emitted from a specific hadronic or nuclear interaction and (iii) the magnitudes of the momentum transfers and of a phase factor (with a maximum value of unity) in the rearrangement process in any collision. Collecting and combining all these relation may be given by (Guptaroy et al, 2008).…”

Direct Photon Production at RHIC and LHC-Energies: Measured Data Versus a Model

“…The salient features and the important physical characteristics of the SCM valid for hadronhadron collisions are as follows: [2]- [4] (i) according to this model, high energy hadronic interactions boil down, essentially, to the pion-pion interactions; as the protons are conceived in this model as p=(π + π 0 ϑ), where ϑ is a spectator particle needed for the dynamical generation of quantum numbers of the nucleons. (ii) the incident energetic π-meson emits a ρ-meson, the ρ-meson then emits a π-meson and is changed into a ω-meson, the ω-meson emits a photon, which is called the direct photon (γ d ) form the viewpoint of the present model, and the π-meson is transformed once again into ρ-meson and the process of direct photon production continues.…”

“…The choice of N R would depend on the following factors: (i) the specificities of the interacting projectile and target, (ii) the particularities of the secondaries emitted from a specific hadronic or nuclear interaction and (iii) the magnitudes of the momentum transfers and of a phase factor (with a maximum value of unity) in the rearrangement process in any collision. Collecting and combining all these, we propose the relation to be given by [4]…”

Ansatzs, Assumptions and Production of J /Ψ-Particles: A Non-charmed Approach versus Charmed Ones

“…The parametrisation is to be done for two physical points, viz., the amount of momentum transfer and the contributions from a phase factor arising out of the rearrangement of the constituent partons. Assorting and combining all these, we propose the relation to be given by [6]…”

“…1(a) and Fig. 1(b), we have drawn the solid lines depicting the SCM model-based results with the help of above four expressions (5), (6) and some other changed forms of them against the experimental measurements [11], [12] respectively.…”