Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Hadron Structure and Spectroscopy V

HK 31.6: Vortrag

Dienstag, 29. März 2022, 17:30–17:45, HK-H8

Measuring Generalized Distribution Amplitudes from the pp→ γγ and pp→ π⁰γ channels with PANDA at FAIR — •Faiza Khalid, Stefan Diehl, and Kai-Thomas Brinkmann for the PANDA collaboration — II. Physikalisches Institut, Justus Liebig Universität Gießen 35392, Germany

The future PANDA experiment at FAIR with the HESR antiproton beam provides unique possibilities to study the 3D nucleon structure with exclusive channels in pp annihilation. Among of the channels of interest for the measurement of Generalized Distribution Amplitudes (GDAs) are pp→ γγ and pp→ π⁰γ. Several simulations at center-of-mass energies squared of, s = 2.5  GeV² , s = 5  GeV² , s = 10  GeV² and s = 15  GeV², were done for these two signal channels and for their associated background channel(s) to check the feasibility of the measurement. The talk will present the feasibility study for the measurement of the cos(θ) dependence of the differential cross-section for pp→ π⁰γ and pp→ γγ at different integrated luminosities. The cross sections have been estimated based on data, which is available in a limited kinematic range from the E760 experiment at Fermilab. Results of count rate estimates and estimates of the expected statistical uncertainty for different integrated luminosity values as well as the signal to background ratio will be presented. Different event selection cuts have been investigated to optimize the signal to background ratio while keeping a reasonable reconstruction efficiency.

The work is supported by BMBF and HFHF.