On the Lambda to Sigma0 ratio from proton proton collisions

Sibirtsev, Alexander; Tsushima, Kazuo; Cassing, Wolfgang; Thomas, Anthony William

On the Lambda to Sigma0 ratio from proton proton collisions

Alexander Sibirtsev
(
- Adelaide U. and
- Giessen U.
)
,
Kazuo Tsushima
(
- Adelaide U.
)
,
Wolfgang Cassing
(
- Giessen U.
)
,
Anthony William Thomas
(
- Adelaide U.
)

Apr, 2000

5 pages

e-Print:

nucl-th/0004022 [nucl-th]

Report number:

ADP-00-15-T399,
UGI-00-7

View in:

ADS Abstract Service

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Abstract:

We compare the recent COSY data on the total

pp{\to}p\Lambda{K^+}

and

pp{\to}p\Sigma^0{K^+}

cross sections with the predictions from two boson exchange models that either are based solely on

\pi

and

K

exchange or include

\pi

,

\eta

and

\rho

exchange as well as the virtual excitation of intermediate baryon resonances. Both models are found to reproduce the data after the inclusion of final state hyperon-nucleon interactions. Thus, within the experimental uncertainties, both models also roughly reproduce the strong dependence of the

\Lambda

to

\Sigma^0

ratio as a function of the excess energy near threshold, as well as at higher energies.

p p: exclusive reaction
Lambda: hadroproduction
Sigma0: hadroproduction
yield: ratio
meson: exchange
exchange: two-particle
baryon resonance: effect
nucleon hyperon: final-state interaction
Feynman graph
channel cross section: energy dependence

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Figures(0)

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