Abstract
The exclusive charmonium production process in $\bar{p}p$ annihilation with an associated $\pi^0$ meson $\bar{p}p\to J/\psi\pi^0$ is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the $J/\psi\to e^+e^-$ decay channel with the PANDA (AntiProton ANnihilation at DArmstadt) experiment is investigated. Simulations on signal reconstruction efficiency as well as the background rejection from various sources including the $\bar{p}p\to\pi^+\pi^-\pi^0$ and $\bar{p}p\to J/\psi\pi^0\pi^0$ reactions are performed with PandaRoot, the simulation and analysis software framework of the PANDA experiment. It is shown that the measurement can be done at PANDA with significant constraining power under the assumption of an integrated luminosity attainable in four to five months of data taking at the maximum design luminosity.
Highlights
Understanding the hadronic structure in terms of the fundamental degrees of freedom of QCD is one of the fascinating questions of present day physics
The FAIR accelerator complex which is under construction to extend the existing Gesellschaft für Schwerionenforschung (GSI) facilities in Darmstadt, Germany, will provide the beam for four experimental pillars, one of which is the P ANDA experiment dedicated to hadronic physics
The study is based on the transition distribution amplitudes (TDAs) model for the description of the signal
Summary
Understanding the hadronic structure in terms of the fundamental degrees of freedom of QCD is one of the fascinating questions of present day physics. The P ANDA experiment [9] will dedicate an important part of its physics program to the investigation of the nucleon structure in antiprotonproton annihilation reactions It includes the detailed study of the timelike electromagnetic nucleon form factors employing both the eþe− and the μþμ− production channels in a broad kinematic range. Nucleon-to-pion TDAs arise in the collinear factorized description of several hard exclusive reactions such as backward electroproduction of pions off nucleons [10,11], which can be studied at JLab [12] and COMPASS in the spacelike regime, while P ANDA will provide access to the same nonperturbative functions in the timelike regime [13,14]. The aim of the present study is to explore the feasibility of the measurement of the reaction pp → J=ψ π0 → eþe−π0 with P ANDA at different incident momenta of the antiproton beam, based on the cross section estimates of Ref. VI, the expected precision on differential cross section measurements is presented
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