Elementary Particle Physics

In our  Elementary Particle Physics Group, we study particle physics phenomena with focusing on the Standard Model.

Although the Standard Model of particle physics has been successful to describe physical phenomena, it fails to explain some theories such as quantum gravity, dark energy, dark matter, neutrino mass and baryon asymmetry. Therefore, some theories beyond standard model have been proposed such as Non-Commutative Standard Model (NCSM), Standard Model Extension (SME) and SuperSymmetry (SUSY).

 In our elementary particle physics group, theoretical and phenomenological aspects of the following subjects are studied

In the elementary particle physics group, we are also interested in the following subjects:

In quantum chromodynamics, the structure and strong coupling nature of the theory means that the conventional perturbative techniques often fail to apply. The QCD sum rules (or Shifman-Zakharov-Vainshtein sum rules) are a way of dealing with this. The idea is to work with gauge invariant operators and operator product of them. The sum rules obtained in this way allow to calculate observable characteristics of the hadronic ground state.

  • Two Higgs doublets model

One of the most popular extensions of the SM is the two-Higgs-doublets model (2HDM), in which two complex Higgs doublets are considered, contrary to the SM which contains one. A possible approach to keep neutral flavor conservation at tree level is to couple all fermions to only one of the Higgs doublets (model I). Another possibility is the coupling of the up-type quarks to the first Higgs doublet and down-type quarks to the second Higgs doublet (model II).

  • Fourth generation

There are three generations according to the SM of particle physics. The possibility of a new generation should not be ruled out. The electroweak data supports an extra generation of heavy quarks, if the mass difference between the new up and down-type quarks is not too large. 

Related faculty:

Dr. Mansour Haghighat

Dr. Reza Khosravi