Partial Wave Analysis of the Reaction $p(3.5 GeV)+p \to pK^+\Lambda$ to Search for the "$ppK^-$" Bound State

HADES collaboration (96 authors); Blanco, A.; Fonte, P.; Lopes, L.; Mangiarotti, A.

http://hdl.handle.net/10400.26/26716

Use this identifier to reference this record.

Name:	Description:	Size:	Format:
1.pdf		1.46 MB	Adobe PDF	Download

Send Feedback

Authors

HADES collaboration (96 authors)

Abstract(s)

Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5 GeV)+p→pK+Λ . This reaction might contain information about the kaonic cluster “ ppK− ” (with quantum numbers JP=0− and total isospin I=1/2 ) via its decay into pΛ . Due to interference effects in our coherent description of the data, a hypothetical K¯NN (or, specifically “ ppK− ”) cluster signal need not necessarily show up as a pronounced feature (e.g. a peak) in an invariant mass spectrum like pΛ . Our PWA analysis includes a variety of resonant and non-resonant intermediate states and delivers a good description of our data (various angular distributions and two-hadron invariant mass spectra) without a contribution of a K¯NN cluster. At a confidence level of CLs=95% such a cluster cannot contribute more than 2–12% to the total cross section with a pK+Λ final state, which translates into a production cross-section between 0.7 μb and 4.2 μb, respectively. The range of the upper limit depends on the assumed cluster mass, width and production process.