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/winkel_tools [ Modules ]

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PURPOSE

Contains the slope b-parameters and other routines used for sampling the angular distributiuons in two-body scattering.


winkel_tools/Cugnon_bpp [ Functions ]

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NAME

real function Cugnon_bpp(plab)

NOTES

b-coefficients from new Cugnon parameterization

INPUTS

  • plab -- lab. momentum (GeV/c)


winkel_tools/Cugnon_bnp [ Functions ]

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NAME

real function Cugnon_bnp(plab)

NOTES

b-coefficients from new Cugnon parameterization

INPUTS

  • plab --lab. momentum (GeV/c)


winkel_tools/tSlope_Effenb [ Functions ]

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NAME

real function tSlope_Effenb(sqrts)

NOTES

b-coefficient for pp elastic scattering parameterization from J. Cugnon et al., NPA 352, 505 (1981)

INPUTS

  • sqrts -- inv. energy (GeV)


winkel_tools/tSlope_PYTHIA [ Functions ]

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NAME

real function tSlope_PYTHIA(sqrts, ID1, ID2)

NOTES

b-coefficient for pp elastic scattering, taken from PYTHIA model, see T. Falter et al., PRC 70, 054609 (2004)

INPUTS

  • sqrts -- inv. energy (GeV)
  • ID1, ID2 --- ids of colliding particles


winkel_tools/tSlope_EL_pbarp [ Functions ]

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NAME

real function tSlope_EL_pbarp(sqrts)

NOTES

b-coefficient for pbar p elastic scattering, taken from L.A. Kondratyuk and M.G. Sapozhnikov, Sov. J. Nucl. Phys. 46, 56 (1987).

INPUTS

  • sqrts -- inv. energy (GeV)


winkel_tools/tSlope_CEX_pbarp [ Functions ]

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NAME

real function tSlope_CEX_pbarp(sqrts)

NOTES

b-coefficient for pbar p --> nbar n charge exchange,

   parameterization of available HEP data at plab=0.7-35 GeV/c by A.L.

INPUTS

  • sqrts -- inv. energy (GeV)


winkel_tools/dsigdt_LE [ Functions ]

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NAME

function dsigdt_LE (sqrts, prcm) result(costheta)

PURPOSE

Choose LambdaBar polar angle for Nbar N -> LambdaBar Lambda.

INPUTS

  • sqrts -- inv. energy (GeV)
  • prcm -- c.m. momentum of colliding particles (GeV/c)

OUTPUT

NOTES

The fit by Theodoros Gaitanos is used: dSigDt = a0 + a1*exp(a2*(tmin-t)). The angle is chosen with respect to the Nbar c.m. momentum. Valid at p_lab < 1.8 GeV/c.


winkel_tools/dsigdt_Regge [ Functions ]

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NAME

function dsigdt_Regge (sqrts, prcm, n) result (costheta)

PURPOSE

Choose the antihyperon polar angle for Nbar N -> Ybar Y.

INPUTS

  • sqrts -- inv. energy (GeV)
  • prcm -- c.m. momentum of colliding particles (GeV/c)
  • n = 1 --- choose LambdaBar polar angle for Nbar N -> LambdaBar Lambda = 2 --- choose LambdaBar polar angle for Nbar N -> LambdaBar Sigma or Lambda polar angle for Nbar N -> SigmaBar Lambda

OUTPUT

NOTES

The angle is chosen with respect to the Nbar c.m. momentum for outgoing LambdaBar or with respect to the N c.m. momentum for outgoing Lambda. Used phenomenological Regge-like fit from B. Sadoulet, CERN-HERA 69-2 : dSigDt \propto sigma*a*exp(a*t)*c**(2.*alpha) + tau*b**2/4.*sqrt(-t)*exp(-b*sqrt(-t))*c**(2.*beta) Valid at p_lab > 1.8 GeV/c