Evidence for W exchange in charmed baryon decays

Albrecht, H.; Hamacher, T.; Hofmann, R.P.; Kirchhoff, T.; Mankel, R.; Nau, A.; Nowak, S.; Schroder, H.; Schulz, H.D.; Walter, M.

doi:10.1016/0370-2693(94)01513-C

Evidence for W exchange in charmed baryon decays

ARGUS

Collaboration

•

H. Albrecht
(
- DESY
)

Oct, 1994

11 pages

Published in:

Phys.Lett.B 342 (1995) 397-401

DOI:

10.1016/0370-2693(94)01513-C

PDG:

{{\mathit \Lambda}_{{{c}}}^{+}}

\rightarrow

{{\mathit \Xi}{(1530)}^{0}}{{\mathit K}^{+}}

Report number:

DESY-94-177

Experiments:

DESY-DORIS-ARGUS

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Abstract: (Elsevier)

Using the detector ARGUS at the e + e − storage ring DORIS II at DESY, we have observed the decays Λ c + → Ξ − K + π + and Λ c + → Ξ ∗0 K + and obtained evidence for the decay Ξ c 0 → ΛK s 0 . All three of these decays are of interest as they provide information about W -exchange processes. The products of cross sections and branching ratios for Λ c + → Ξ − K + π + and Λ c + → Ξ ∗0 K + are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the Ξ − K + π + final state is generated through a two-body decay via intermediate W -exchange. The product of production cross section and branching ratio for Ξ c 0 → Λ K s 0 is (2.1 ± 1.0 ± 0.6) pb.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
charmed baryon: nonleptonic decay
nonleptonic decay: charmed baryon
W: exchange
exchange: W
mass spectrum
channel cross section: branching ratio

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