The reactions p p ---> p Lambda K+ and p p ---> p Sigma0 K+ near their thresholds - INSPIRE

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The reactions p p ---> p Lambda K+ and p p ---> p Sigma0 K+ near their thresholds

A. Gasparian
(
- Julich, Forschungszentrum and
- Moscow, ITEP
)
,
J. Haidenbauer
(
- Julich, Forschungszentrum
)
,
C. Hanhart
(
- Washington U., Seattle
)
,
L. Kondratyuk
(
- Moscow, ITEP
)
,
J. Speth
(
- Julich, Forschungszentrum
)

Sep, 1999

13 pages

Published in:

Phys.Lett.B 480 (2000) 273-279

e-Print:

nucl-th/9909017 [nucl-th]

DOI:

10.1016/S0370-2693(00)00412-3

Report number:

NT-UW-99-50,
DOE-ER-40561-68

View in:

reference search52 citations

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Abstract:

The reactions

pp\to p\Lambda K^+

and

pp\to p\Sigma^0K^+

are studied near their thresholds. The strangeness production process is described by the

\pi

- and

K

exchange mechanisms. Effects from the final state interaction in the hyperon-nucleon system are taken into account rigorously. It is found that the

\Lambda

production is dominated by

K

exchange whereas

K

- as well as

\pi

exchange play an important role for the

\Sigma^0

case. It is shown that the experimentally observed strong suppression of

\Sigma^0

production compared to

\Lambda

production at the same excess energy can be explained by a destructive interference between

\pi

and

K

exchange in the reaction

pp\to p\Sigma^0K^+

. Implications of such an interference on the reaction

pp\to n\Sigma^+K^+

are pointed out.

p p: exclusive reaction
Lambda: hadroproduction
Sigma0: hadroproduction
K+: associated production
threshold
pi: exchange
K: exchange
final-state interaction
vertex function
channel cross section: energy dependence

References(32)

Figures(0)

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,
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