Journal article

Publication year: 2004

Pages: 216-222

Journal: Physics Letters B

Volume number: 595

Issue number: 1-4

ISSN: 0370-2693

eISSN: 1873-2445

Open access status: Hybrid

DOI Link: https://doi.org/10.1016/j.physletb.2004.05.054

Publisher: Elsevier

Abstract: 
In the present Letter we investigate pi(0)pi(0) and pi(+/-)pi(0) photoproduction off complex nuclei at incident beam energies of 400460 MeV Simulations of two pion photoproduction on protons and nuclei are performed by means of a semi-classical BUU transport model including a full coupled-channel treatment of the final state interactions. Elastic scattering of the final state pions with the nucleons in the surrounding nuclear medium is found to yield a downward shift of the pipi invariant mass distribution. We show that the target mass dependence of the pi(0)pi(0) invariant mass spectrum as measured by the TAPS Collaboration can be explained without introducing medium effects beyond absorption and quasi-elastic scattering of the final state particles. On the other hand, we find considerable discrepancies with the data in the pi(+/-)pi(0) channel, which are not understood. (C) 2004 Elsevier B.V. All rights reserved.

Harvard Citation style: Mühlich, P., Alvarez-Ruso, L., Buss, O. and Mosel, U. (2004) Low-energy ππ photoproduction off nuclei, Physics Letters B, 595(1-4), pp. 216-222. https://doi.org/10.1016/j.physletb.2004.05.054

APA Citation style: Mühlich, P., Alvarez-Ruso, L., Buss, O., & Mosel, U. (2004). Low-energy ππ photoproduction off nuclei. Physics Letters B. 595(1-4), 216-222. https://doi.org/10.1016/j.physletb.2004.05.054