Induced decay of composite JPC=1++ particles in atomic Coulomb fields

  • The electron-positron pairs observed in heavy-ion collisions at Gesellschaft für Schwerionen-forschung Darmstadt mbH have been interpreted as the decay products of yet unknown particles with masses around 1.8 MeV. The negative results of resonant Bhabha scattering experiments, however, do not support such an interpretation. Therefore we focus on a more complex decay scenario, where the e+e- lines result from a two-collision process. We discuss the induced decay of a metastable 1++ state into e+e- pairs. For most realizations of a 1++ state such a decay in leading order can only take place in the Coulomb field of a target atom. This fact has the attractive consequence that for such a state the Bhabha bounds are no longer valid. However, the absolute value of the e+e- production cross section turns out to be unacceptably small.

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Author:Eckart Stein, Joachim ReinhardtGND, Andreas SchäferORCiDGND, Walter GreinerGND
Parent Title (German):Physical review A
Document Type:Article
Date of Publication (online):2006/07/12
Year of first Publication:1994
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/07/12
Page Number:4
First Page:867
Last Page:870
Source:Phys. Rev. A 50, 867~V870 (1994), ©1994 The American Physical Society,
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:10.00.00 THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS (for experimental methods and instrumentation for elementary-particle physics, see section 29) / 12.00.00 Specific theories and interaction models; particle systematics / 12.20.-m Quantum electrodynamics / 12.20.Ds Specific calculations
30.00.00 ATOMIC AND MOLECULAR PHYSICS / 34.00.00 Atomic and molecular collision processes and interactions (for atomic, molecular, and ionic collisions in plasma, see 52.20.Hv; for atoms and molecules of astrophysical interest, see 95.30.Dr, Ft; see also 98.38.Bn and 98.58.Bz in interstellar media in as / 34.90.+q Other topics in atomic and molecular collision processes and interactions (restricted to new topics in section 34)
Licence (German):License LogoDeutsches Urheberrecht