### TABLE OF CONTENTS

- 1. /antiKaonNucleon
- 1.1. antiKaonNucleon/kaonBarNuc
- 1.1.1. kaonBarNuc/evaluateXsections
- 1.1.2. kaonBarNuc/init
- 1.1.3. kaonBarNuc/makeDecision
- 1.1.4. kaonBarNuc/makeOutput

## /antiKaonNucleon [ Modules ]

NAME

module **antiKaonNucleon**

PURPOSE

Includes the cross sections for Kbar(Kbar^*)-nucleon and K(K^*)-antinucleon elastic and inelastic scattering Public routines:

## antiKaonNucleon/kaonBarNuc [ Subroutines ]

[ Top ] [ antiKaonNucleon ] [ Subroutines ]

NAME

subroutine **kaonBarNuc**(srts,teilchenIN,mediumATcollision,momentumLRF,teilchenOUT,sigmaTot,sigmaElast,plotFlag)

PURPOSE

Evaluates Kbar(Kbar^*) N -> Y^*, Kbar N -> Kbar N, Kbar N -> Y pi and Kbar N -> Y^* pi as well as K(K^*) Nbar -> Ybar^*, K Nbar -> K Nbar, K Nbar -> Ybar pi, K Nbar -> Ybar^* pi cross sections and returns also a "preevent"

INPUTS

- real, intent(in) :: srts ! sqrt(s) in the process
- type(particle),dimension(1:2), intent(in) :: teilchenIn ! colliding particles
- type(medium), intent(in) :: mediumATcollision ! Medium informations at the position of the collision
- real, intent(in) ,dimension(0:3) :: momentumLRF ! Total Momentum in LRF

Debugging:

- logical, intent(in),optional :: plotFlag ! Switch on plotting of the Xsections

OUTPUT

- real, intent(out) :: sigmaTot ! total Xsection
- real, intent(out) :: sigmaElast ! elastic Xsection

This routine does a Monte-Carlo-decision according to the partial cross sections to decide on a final state with maximal 2 final state particles. These are returned in the vector teilchenOut. The kinematics of these teilchen is only fixed in the case of a single produced resonance. Otherwise the kinematics still need to be established. The result is:

- type(preEvent),dimension(1:3), intent(out) :: teilchenOut ! outgoing particles

The cross sections are based on parameterization by M. Effenberger.

NOTES

Possible final states are :

## kaonBarNuc/evaluateXsections [ Subroutines ]

[ Top ] [ kaonBarNuc ] [ Subroutines ]

NAME

subroutine **evaluateXsections**

PURPOSE

Evaluates Kbar(Kbar^*) N -> Y^*, Kbar N -> Kbar N, Kbar N -> Y pi and Kbar N -> Y^* pi cross sections

NOTES

There is a resonance contribution to Kbar(Kbar^*) N scattering.

## kaonBarNuc/init [ Subroutines ]

[ Top ] [ kaonBarNuc ] [ Subroutines ]

NAME

subroutine **init**

PURPOSE

Discretises the backgrond cross sections for Kbar-nucleon scattering.

## kaonBarNuc/makeDecision [ Subroutines ]

[ Top ] [ kaonBarNuc ] [ Subroutines ]

NAME

subroutine **makeDecision**

PURPOSE

Chooses randomly one of possible outgoing channels in antikaon-nucleon collision. Outgoing channels are: Y^*, Kbar N, Y pi, Y^* pi. Also the charges of outgoing particles are selected.

## kaonBarNuc/makeOutput [ Subroutines ]

[ Top ] [ kaonBarNuc ] [ Subroutines ]

NAME

subroutine **makeOutput**

PURPOSE

Writes all cross sections to file as function of srts and plab [GeV] . Filenames:

- 'KbarN_sigTotElast.dat' : sigmaTot, sigmaElast
- 'KbarN_KmN.dat' : K^- Nucleon outgoing channel
- 'KbarN_Kbar0N.dat' : Kbar^0 Nucleon outgoing channel
- 'KbarN_LambdaPi.dat' : Lambda pion outgoing channel
- 'KbarN_SigmaPip.dat' : Sigma pi^+ outgoing channel
- 'KbarN_SigmaPi0.dat' : Sigma pi^0 outgoing channel
- 'KbarN_SigmaPim.dat' : Sigma pi^- outgoing channel
- 'KbarN_YstPi.dat' : Y^* pion outgoing channel summed
- : over all final hyperon resonances
- : with M >= 1600 MeV

NOTES

for the Kbar^* N input channel only total resonance X section is printed out