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Particle Physics Tour with CalcHEP. by Shymaa M. Seif Assistant lecturer in Physics Department Cairo University, Egypt Supervision: Dr. A. Glayshev A. Bednyakov. 1.

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Particle physics tour with calchep

Particle Physics Tour with CalcHEP

by

Shymaa M. Seif

Assistant lecturer in Physics Department

Cairo University, Egypt

Supervision:

Dr. A. Glayshev

A. Bednyakov

1


Calchep

CalcHEP package is created for calculation of decay and high energy collision processes of elementary particle in tree approximation.

The mean idea of CalcHEP is to make available passing from the Lagrangian to the final distribution effectively, with high level of automatization.

CalcHEP

2


Some useful features calchep
Some useful features CalcHEP energy collision processes of elementary particle in tree approximation.

  • You can restrict/specify the particle that enter the intermediate state.

  • CalcHEP provides a menu of structure functions, including CTEQ6 series which can be used to help compute pp scattering processes.

  • You can apply cuts before computing cross sections, sometimes this is necessary to remove divergences.

  • CalcHEP can perform calculations in various SUSY models; this is require CERNLIB

  • Limit on number of external legs (involved particles)and number of diagrams

3


Calchep sm particles
CalcHEP SM Particles energy collision processes of elementary particle in tree approximation.

4


Calchep sm parameters
CalcHEP SM Parameters energy collision processes of elementary particle in tree approximation.

5


Calchep sm constraints
CalcHEP SM Constraints energy collision processes of elementary particle in tree approximation.

6


Calchep sm vertices
CalcHEP SM Vertices energy collision processes of elementary particle in tree approximation.

7


Switch on external libraries
Switch on External Libraries energy collision processes of elementary particle in tree approximation.

8


Particle content of calchep
Particle content of CalcHEP energy collision processes of elementary particle in tree approximation.

9


Calchep limitations
CalcHEP limitations energy collision processes of elementary particle in tree approximation.

  • No Hadronic bound state.

  • No loop o box diagrams.

  • All processes are averaged over allowed initial-state spin polarizations and summed over final-state polarization.

  • No neutrino oscillations.

10


Procedure for computing results
Procedure for computing results energy collision processes of elementary particle in tree approximation.

  • Specify decay or scattering process

  • View diagrams; can be written in latex, can delet selected diagrams

  • Square diagrams (can view)

  • Symbolic calculations

  • Write results

  • C code

  • C-compiler

  • Go to new window for numerical calculations

  • Select subprocess if applicable

  • Define cuts if desired

  • Vegas (Simpson if applicable)

  • Set distributions and ranges if desired

  • Integrate (2 < 1 for numerically consistent result)

  • View distribution

  • Generate events if desired

11


Setting model parameters
Setting Model Parameters energy collision processes of elementary particle in tree approximation.

  • I have studied the dependence of the total cross section on the mass of light Higgs mass for the tree level process

    in mSUGRA.

  • The model parameters were set:

    tanβ=10, μ>1, m0 = –A0 =100 GeV and m1/2 =250 GeV.

    and the SM parameters had taken as

    ew(MZ)-1 =127.918, mW =80.423 GeV, mZ = 91.18 GeV,

    mt =175 GeV, mb =4.62 GeV

12


Control of the initial states and parton density functions
control of the initial states and parton density energy collision processes of elementary particle in tree approximation.functions

  • The structure function (PDF) for the proton is CTEQ6l

  • The momenta for both protons = 7000 GeV

The cuts

  • M0  30 GeV, m >176 GeV, m >173GeV,

  • The momenta for both protons = 7000 GeV such thats =14 TeV

13


Lo feynman diagrams for
LO Feynman Diagrams for energy collision processes of elementary particle in tree approximation.

14


Lo feynman diagrams for1
LO Feynman Diagrams for energy collision processes of elementary particle in tree approximation.

15


Comparison between cross sections
Comparison between cross-sections energy collision processes of elementary particle in tree approximation.

Table 1

Table 2

16


17 energy collision processes of elementary particle in tree approximation.


18 energy collision processes of elementary particle in tree approximation.


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