| Issue |
EPJ Web Conf.
Volume 204, 2019
XXIV International Baldin Seminar on High Energy Physics Problems “Relativistic Nuclear Physics and Quantum Chromodynamics” (Baldin ISHEPP XXIV)
|
|
|---|---|---|
| Article Number | 01015 | |
| Number of page(s) | 10 | |
| Section | Plenary Session | |
| DOI | https://doi.org/10.1051/epjconf/201920401015 | |
| Published online | 03 April 2019 | |
https://doi.org/10.1051/epjconf/201920401015
Δ-Isobar contribution to the pion production in the reaction pp → {pp}sπ0
1 Laboratory of Nuclear Problems, JINR, RU-141980 Dubna, Russia
2 Department of Physics, M.V. Lomonosov Moscow State University, RU-119991 Moscow, Russia
3 Dubna State University, RU-141980 Dubna, Russia
* e-mail: uzikov@jinr.ru
Published online: 3 April 2019
ANKE@COSY data on the cross section of the reaction pp → {pp}sπ0, where {pp}s is the proton pair in the 1S 0 state at small excitation energy Epp = 0 – 3 MeV, obtained at beam energies 0.5 - 2.0 GeV are analyzed within the one-pion exchange model. The model involves the subprocess π0 p → π0 p and accounts for the final state pp-interaction. A broad maximum observed in the cross section of the reaction pp → {pp}sπ0 at 0.5 - 1.4 GeV in the forward direction is explained by this model as a dominant contribution of the isospin 
in the π0 p-scattering. The second bump in data at 2 GeV is underpredicted within this model by one order of magnitude. An explicit excitation of the Δ(1232)-isobar using the box-diagram is also considered in the region of the first maximum.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.