| Issue |
EPJ Web Conf.
Volume 303, 2024
The 16th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2023)
|
|
|---|---|---|
| Article Number | 03002 | |
| Number of page(s) | 6 | |
| Section | Nucleon Structure in DIS | |
| DOI | https://doi.org/10.1051/epjconf/202430303002 | |
| Published online | 25 September 2024 | |
https://doi.org/10.1051/epjconf/202430303002
Hard exclusive π0 muoproduction at COMPASS
1 Charles university, Ovocný trh 560/5, Prague, Czechia
2 Czech Technical University in Prague, Jugoslávských partyzánů 1580/3r, Prague, Czechia
* e-mail: marketa.peskova@cern.ch
** e-mail: karolina.lavickova@cern.ch
Published online: 25 September 2024
Hard Exclusive Meson Production (HEMP) and Deeply Virtual Compton Scattering (DVCS) are very promising reactions to access Generalized Parton Distributions (GPDs). Such exclusive measurements were performed at COMPASS in 2016 and 2017 at the M2 beamline of the CERN SPS using the 160 GeV muon beam scattering off a 2.5 m long liquid hydrogen target surrounded by a barrel-shaped time-of-flight system to detect the recoiling target proton. The scattered muons and the produced real photons were detected by the COMPASS spectrometer, which was supplemented by an additional electromagnetic calorimeter for the detection of large-angle photons. Exclusive π0 production is the main source of background for the DVCS measurement, while it provides complementary information for the parametrization of GPDs. We will report on preliminary results of the exclusive π0 production cross section and its dependence on the squared four-momentum transfer |t| and on the azimuthal angle ϕ between the scattering plane and the π0 production plane. The COMPASS data will provide further input to constrain GPDs, in particular chiral-odd (“transversity”) GPDs.
© The Authors, published by EDP Sciences, 2024
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