Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H09: Hadronic Interactions
10:45 AM–12:33 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Units:
DNP GHP
Chair: Kenneth Hicks, Ohio University
Abstract: H09.00006 : Meson Photo-Production in {\Geant} for $E_\gamma =0.225-3.0$~GeV Using the $\gamma + p \rightarrow p + \pi ^0$ reaction*
11:45 AM–11:57 AM
View Presentation Abstract
Presenter:
Sokhna Bineta Amar
(University Cheikh Anta Diop)
Authors:
Sokhna Bineta Amar
(University Cheikh Anta Diop)
Oumar Ka
(University Cheikh Anta Diop)
Paul L Gueye
(Michigan State Univ)
The purpose of this study is to compare experimental data and theoretical models implemented in version 9.6.p02 of the {\Geant} Monte Carlo simulation toolkit for the exclusive and differential cross sections of $\pi^0$ photo-production. The data from the Chiral Invariant Phase Space (CHIPS) and Bertini Cascade (BERT) models were compared to the experimental data from the CEBAF Large Acceptance Spectrometer (CLAS) of Jefferson Lab and the phenomenological Scattering Analysis Interactive Dial-in (SAID) model. Relativistic Breit-Wigner fits of the $\Delta(1232)$, N*(1520), N*(1650) and N*(1875) resonances give agreements to within 3\% for the mass of each resonance. BERT does not allow for an accurate description of the energy distribution. The angular distributions of the cross sections show significant differences between CHIPS and both CLAS and SAID. The physics in CHIPS appears to be correct but it needs further development for the individual resonances contributions that could be useful since it is also the only model able to treat electromagnetically induced meson production for $A>1$.
*Jefferson Science Associates, LLC operates Jefferson Lab for the U.S. DOE under U.S. DOE contract DE-AC05-060R23177. The Spanish Cooperation initial partial funding of this work.
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