### TABLE OF CONTENTS

## /hypNuc_hypNuc [ Modules ]

NOTES

This module includes the calculation of (a) Lambda(Sigma) nucleon --> Lambda(Sigma) nucleon (S=-1 channels) (b) Xi nucleon --> Lambda(Sigma) Lambda(Sigma) (S=-2 channels) cross sections including isospin exchange. The properties of all final channels are calculated.

## hypNuc_hypNuc/hypNuc_hypNuc_Main [ Functions ]

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NAME

function **hypNuc_hypNuc_Main** (srts, teilchenIN) result (sigma_yn)

PURPOSE

- This routine prepares the final state for each isospin channel.

INPUTS

- type(particle), dimension (1:2), intent(in) :: teilchenIN -- incoming particles
- real, intent(in) :: srts -- sqrt(s) [GeV]

OUTPUT

- see global variables of this module.

NOTES

Included reactions:

- Lambda Nucleon -> Lambda Nucleon
- Lambda Nucleon -> Sigma Nucleon
- Sigma Nucleon -> Sigma Nucleon
- Sigma Nucleon -> Lambda Nucleon
- Xi Nucleon -> Xi Nucleon
- Xi Nucleon -> Lambda Lambda
- Xi Nucleon -> Lambda Sigma

## hypNuc_hypNuc/get_XiN_Set [ Subroutines ]

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NAME

returns the value of XiN_Set

PURPOSE

Reads from Namelist 'XiN_input' the value for the variable XiN_Set, which determines the model usage for the Xi nucleon cross sections.

## hypNuc_hypNuc/get_Channels_YN [ Functions ]

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NAME

function **get_Channels_YN** (InChan) result (ch)

PURPOSE

Returns channel infos (IDs and charges) as a PreEvent vector.

INPUTS

integer :: InChan -- Number of final channel

## hypNuc_hypNuc/xsectionYN [ Functions ]

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NAME

real function **xsectionYN** (srts, M_Nuc, M_Hyp, ichan)

PURPOSE

- This function calculates the hyperon-baryon -> hyperon baryon cross sections for a particular isospin channel "ichan".
- The cross sections are given in mb.

INPUTS

- integer, intent(in) :: ichan -- initial channel
- real, intent(in) :: M_Nuc,M_Hyp -- masses of incoming particles
- real, intent(in) :: srts -- sqrt(s) [GeV]

NOTES

- Fits to experimentally known cross sections.
- Not for all channels the XS were experimentally known. The XS's for the unknown channels were calculated using detailed balance or charge symmetry.
- For the important channels, where a Lambda is converted into a Sigma (or a Sigma to a Lambda), the Xsections are known.
- References for exp. data on hyperon+nucleon scattering: Landolt-Boernstein, New Series I/12b, p. 323: "Hyperon induced reactions" M.M. Nagels, T.A. Rijken, J.J. De Swart, Annals of Physics 79 (1973) 338. T.A. Rijken, Y. Yamamoto, Phys. Rev. C73 (2006) 044008.
- Xi+N scattering cross sections: no exp. data available here; fits to theoretical calculations: ESC04a model, T.A. Rijken, Y. Yamamoto, nucl-th/0608074 (30.08.2006), Tables IX,X,XI & XII.
- Xi+N scattering cross sections UPDATE: theoretical calculations from Fujiwara et al., PRC64, 054001 including exclusive more channels.