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/mesonMeson_Xsections [ Modules ]

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NAME

module mesonMeson_Xsections

PURPOSE

Provide parametrizations for (some) meson-meson cross sections

mesonMeson_Xsections/sig_pipi2kkbar [ Functions ]

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NAME

real function sig_pipi2kkbar(srts,srts0)

PURPOSE

Cross section of pi pi --> K Kbar averaged over isospins of incoming pions and summed over isospins of outgoing pions

INPUTS

  • real:: srts -- c.m. energy of incoming particles (GeV),
  • real:: srts0 -- threshold c.m. energy (GeV),

OUTPUT

  • sig_pipi2kkbar -- cross section (mbarn)

mesonMeson_Xsections/kkbar_cross [ Subroutines ]

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NAME

subroutine kkbar_cross(iQ,srts,pinitial2,const,msigbg,useWidth)

PURPOSE

calculate the cross-sections for the KKbar incoming channel

INPUTS

  • integer:: iQ -- total charge of K and Kbar
  • real :: srts -- c.m. energy (GeV)
  • real :: pinitial2 -- c.m. momentum squared of incoming particles (GeV/c)**2
  • real :: const -- cross section of nonstrange+nonstrange --> K Kbar or --> Kstar Kbar, K Kbarstar (mbarn)
  • logical:: useWidth -- flag whether to use the width or just pole masses

OUTPUT

  • real, dimension(21) :: msigbg(i), i=1,2,..,21 --- partial cross sections for different outgoing channels (mbarn)

mesonMeson_Xsections/kstarkbar_cross [ Subroutines ]

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NAME

subroutine kstarkbar_cross(iQ,srts,pinitial2,const,msigbg,useWidth)

PURPOSE

calculate cross-sections for Kstar Kbar or K Kstarbar incoming channels

INPUTS

  • integer :: iQ --- total charge of Kstar and Kbar,
  • real :: srts --- c.m. energy (GeV),
  • real :: pinitial2 --- c.m. momentum squared of incoming particles (GeV/c)**2,
  • real :: const --- cross section of nonstrange+nonstrange --> K Kbar or --> Kstar Kbar, K Kbarstar (mbarn),
  • logical:: useWidth -- flag whether to use the width or just pole masses

OUTPUT

  • real, dimension(:) :: msigbg(i), i=1,2,..,21 --- partial cross sections for different outgoing channels (mbarn)

mesonMeson_Xsections/kkbar_out [ Subroutines ]

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NAME

subroutine kkbar_out(iQ,msigbg,sigbgt,teilchenOut)

PURPOSE

choose outgoing state for the K Kbar annihilation

INPUTS

  • integer :: iQ --- total charge of K and Kbar,
  • real, dimension(:) ::msigbg(i), i=1,2,...,21 --- partial cross sections for different outgoing channels (mbarn),
  • real ::sigbgt --- total background cross section (mbarn)

OUTPUT

  • type(preEvent),dimension(21) :: teilchenOut --- outgoing particles

NOTE * This routine handles also the kstarkbar case

mesonMeson_Xsections/pcm2Integrated [ Functions ]

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NAME

real function pcm2Integrated( srts, iCh )

PURPOSE

calculate the phase space (squared) by integrating over the spectral functions of the particles of the given channel.

Threshold is treated correctly by using the minimal masses.

INPUTS

  • real :: srts -- c.m. energy (GeV)
  • integer :: iCh -- number of channel to consider

OUTPUT

  • phase space squared in GeV^2

mesonMeson_Xsections/pcm2Pole [ Functions ]

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NAME

real function pcm2Pole( srts, iCh )

PURPOSE

calculate the phase space (squared) by calculating the pCM assuming pole masses of the particles in the given channel.

Threshold is treated correctly by using the pole masses.

INPUTS

  • real :: srts -- c.m. energy (GeV)
  • integer :: iCh -- number of channel to consider

OUTPUT

  • phase space (squared) in GeV^2

mesonMeson_Xsections/pcm2 [ Functions ]

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NAME

real function pcm2( srts, iCh, useWidth )

PURPOSE

Shorthand for calling pcm2Integrated or pcm2Pole

mesonMeson_Xsections/mesMes_Tabulate [ Subroutines ]

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NAME

subroutine mesMes_Tabulate

PURPOSE

Initialize the cross sections by tabulating them as function of sqrt(s)

mesonMeson_Xsections/calculate1 [ Functions ]

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NAME

real function calculate1(srts, id1, id2)

PURPOSE

Calculates the integral of pCM**2 for id1 stable, id2 instable

mesonMeson_Xsections/calculate2 [ Functions ]

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NAME

real function calculate2(srts, id1, id2)

PURPOSE

Calculates the integral of pCM for id1 instable, id2 instable