The Reaction p p ---> p Lambda K+ near threshold

Kaiser, Norbert

doi:10.1007/s100500050263

The Reaction p p ---> p Lambda K+ near threshold

Norbert Kaiser
(
- Munich, Tech. U.
)

Feb, 1999

8 pages

Published in:

Eur.Phys.J.A 5 (1999) 105-110

e-Print:

nucl-th/9902046 [nucl-th]

DOI:

10.1007/s100500050263

View in:

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Abstract:

We analyze the recent total cross section data for

pp \to p\Lambda K^+

near threshold measured at COSY. Using an effective range approximation for the on-shell

p\Lambda

S-wave final state interaction we extract from these data the combination

{\cal K} = \sqrt{2|K_s|^2+|K_t|^2} = 0.38

fm

^4

of the singlet (

K_s

) and triplet (

K_t

) threshold transition amplitudes. We present an exploratory calculation of various (tree-level) vector and pseudoscalar meson exchange diagrams. Pointlike

\omega

-exchange alone and the combined (

\rho^0,\omega,K^{*+}

)-exchange can explain the experimental value of

\cal K

. The pseudoscalar meson exchanges based on a SU(3) chiral Lagrangian turn out to be too large. However, when adding

\pi^0

-exchange in combination with the resonant

\pi N \to S_{11}(1650)\to K \Lambda

transition and introducing monopole form factors with a cut-off

\Lambda_c= 1.5

GeV one is again able to reproduce the experimental value of

\cal K

. More exclusive measurements are necessary to reveal the details of the

pp\to p\Lambda K^+

production mechanism.

Note:

Accepted for publication in Eur. Phys. J. A

p p: exclusive reaction
K+: hadroproduction
Lambda: associated production
threshold
p Lambda: final-state interaction
partial wave
approximation: effective range
Feynman graph
pseudoscalar meson: exchange
vector meson: exchange

References(17)

Figures(0)

Lambda hyperon production via the p p ---> p K+ Lambda reaction 2-MeV above threshold

et al.

- Phys.Lett.B 388 (1996) 859-865
•
DOI:
- 10.1016/S0370-2693(96)01360-3

Total cross-section of the reaction p p ---> p K+ Lambda close to threshold

J.T. Balewski
(
- Cracow, INP and
- Julich, Forschungszentrum
)
,
A. Budzanowski
(
- Cracow, INP
)
,
H. Dombrowski
(
- Munster U.
)
,
W. Eyrich
(
- Erlangen - Nuremberg U.
)
,
C. Goodman
(
- Indiana U.
)

et al.

- Phys.Lett.B 420 (1998) 211-216
•
e-Print:
- nucl-ex/9803003
•
DOI:
- 10.1016/S0370-2693(97)01527-X

Strangeness production in the reaction pp --> K+ Lambda p in the threshold region

et al.

- Phys.Lett.B 420 (1998) 217-224
•
DOI:
- 10.1016/S0370-2693(97)01573-6

Comparison of the near threshold production of eta and K mesons in proton proton collisions

Goran Faldt
(
- Uppsala U.
)
,
Colin Wilkin
(
- University Coll. London
)

- Z.Phys.A 357 (1997) 241-243
•
e-Print:
- nucl-th/9612019
•
DOI:
- 10.1007/s002180050239

Internal nuclear momentum and subthreshold kaon production

A. Sibirtsev
(
- Dubna, JINR
)

- Phys.Lett.B 359 (1995) 29-32
•
DOI:
- 10.1016/0370-2693(95)01050-Z

p p ---> p K+ Lambda reaction in an effective Lagrangian model

R. Shyam
(
- Saha Inst.
)

- Phys.Rev.C 60 (1999) 055213
•
e-Print:
- nucl-th/9901038
•
DOI:
- 10.1103/PhysRevC.60.055213

Novel approach to pion and eta production in proton proton collisions

- Eur.Phys.J.A 4 (1999) 259-275
•
e-Print:
- nucl-th/9806013
•
DOI:
- 10.1007/s100500050229

SU(3) chiral dynamics with coupled channels: Eta and kaon photoproduction

- Nucl.Phys.A 612 (1997) 297-320
•
e-Print:
- hep-ph/9607459
•
DOI:
- 10.1016/S0375-9474(96)00321-1

Study of the lambda-n system in low-energy lambda-p elastic scattering

et al.

- Phys.Rev. 173 (1968) 1452-1460
•
DOI:
- 10.1103/PhysRev.173.1452

Low-energy lambda-proton elastic scattering

- Phys.Rev. 175 (1968) 1735-1740
•
DOI:
- 10.1103/PhysRev.175.1735

Baryon Baryon Scattering in a One Boson Exchange Potential Approach. 3. A Nucleon-Nucleon and Hyperon - Nucleon Analysis Including Contributions of a Nonet of Scalar Mesons

- Phys.Rev.D 20 (1979) 1633
•
DOI:
- 10.1103/PhysRevD.20.1633

A Meson Exchange Model for the Hyperon Nucleon Interaction

- Nucl.Phys.A 500 (1989) 485-528
•
DOI:
- 10.1016/0375-9474(89)90223-6

Meson exchange hyperon - nucleon interactions in free scattering and nuclear matter

A. Reuber
(
- Julich, Forschungszentrum
)
,
K. Holinde
(
- Julich, Forschungszentrum
)
,
J. Speth
(
- Julich, Forschungszentrum
)

- Nucl.Phys.A 570 (1994) 543-579
•
DOI:
- 10.1016/0375-9474(94)90073-6

Low-energy Lambda p scattering parameters from the p p ---> p K+ Lambda reaction

J.T. Balewski
(
- Cracow, INP and
- Julich, Forschungszentrum
)
,
A. Budzanowski
(
- Cracow, INP
)
,
C. Goodman
(
- Indiana U.
)
,
D. Grzonka
(
- Julich, Forschungszentrum
)
,
M. Hofmann
(
- Julich, Forschungszentrum
)

et al.

- Eur.Phys.J.A 2 (1998) 99-104
•
e-Print:
- nucl-ex/9803008
•
DOI:
- 10.1007/s100500050095

Comparison of Lambda and Sigma**0 threshold production in proton proton collisions

S. Sewerin
(
- Julich, Forschungszentrum
)
,
G. Schepers
(
- Julich, Forschungszentrum and
- Munster U.
)
,
J.T. Balewski
(
- Julich, Forschungszentrum and
- Cracow, INP
)
,
A. Budzanowski
(
- Cracow, INP
)
,
W. Eyrich
(
- Erlangen - Nuremberg U.
)

et al.

- Phys.Rev.Lett. 83 (1999) 682-685
•
e-Print:
- nucl-ex/9811004
•
DOI:
- 10.1103/PhysRevLett.83.682

Kaon - Nucleon Parameters

Alan D. Martin
(
- Durham U.
)

- Nucl.Phys.B 179 (1981) 33-48
•
DOI:
- 10.1016/0550-3213(81)90247-9

The Bonn Meson Exchange Model for the Nucleon Nucleon Interaction

R. Machleidt
(
- Los Alamos and
- UCLA
)
,
K. Holinde
(
- Bonn U.
)
,
C. Elster
(
- Bonn U.
)

- Phys.Rept. 149 (1987) 1-89,
- Phys. Rep. 149 ( 1987) 1-89
•
DOI:
- 10.1016/S0370-1573(87)80002-9