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

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

HADES

Collaboration

•

G. Agakishiev
(
- Dubna, JINR
)

Oct 29, 2014

7 pages

Published in:

Phys.Lett.B 742 (2015) 242-248

Published: Mar 6, 2015

e-Print:

1410.8188 [nucl-ex]

DOI:

10.1016/j.physletb.2015.01.032

Experiments:

GSI-HADES

View in:

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Abstract: (Elsevier)

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.

Note:

7 Pages, 5 Figures

Kaonic nuclei
Anti-kaon–nucleon physics
ppK−
Low energy QCD
Partial wave analysis
[formula omitted]
cluster: mass
interference: effect
partial wave analysis
mass spectrum: two-particle

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