Abstract

Exclusive channels of antiproton annihilation on the bound nucleon are sensitive to mesonic interactions with the target residue. If the hard scale is present, then such interactions should be reduced due to color transparency (CT). In this paper, the d(p¯,π−π0)p reaction is discussed at a large center-of-mass angle. Predictions for the future PANDA (antiProton ANnihilations at DArmstadt) experiment at FAIR (Facility for Antiproton and Ion Research, Darmstadt, Germany) are given for nuclear transparency ratios calculated within the generalized eikonal approximation and the quantum diffusion model of CT.

Highlights

  • Exclusive channels of antiproton annihilation on the bound nucleon are sensitive to mesonic interactions with the target residue

  • The physics program of the future PANDA experiment [1,2] includes a substantial part related to the studies of antiproton–nucleus reactions at the beam momentum of 1.5–15 GeV/c, with c being the speed of light

  • By requiring that the particle of interest slows down in the collision with a nucleon, one can study the influence of a nuclear medium on the properties of the antiproton and produced particles such as antibaryon potentials, new decay channels due to the in-medium thresholds (e.g., ψ0 → D D), and the partial restoration of chiral symmetry at finite baryon number density

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Summary

Introduction

Exclusive channels of antiproton annihilation on the bound nucleon are sensitive to mesonic interactions with the target residue. Other variables in Equations (2) and (3) are defined as follows: The momentum transfers to the spectator proton perpendicular to the antiproton and π 0 momenta are denoted as kt, pand kt,2 , respectively, so that kt, ppp = 0 and kt,2 k2 = 0.

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