Aleksandrs Aleksejevs

 
 

My theoretical research is focused on the searches of the physics beyond the Standard Model (BSM) and  study of the properties of hadrons using effective field theories through the computational modeling.

  1. 1.  Although the Standard Model of particle physics proved to be the most successful model of the subatomic physics, it is incomplete and requires further development. There are quite a few number of topics Standard Model is not capable to resolve:


  2. Bullet Fundamental symmetries and matter-antimatter asymmetry

  3. Bullet Generations of matter

  4. Bullet Magnetic monopoles

  5. Bullet Hierarchy problem

  6. Bullet Supersymmetry

  7. Bullet Unification

Besides the tremendous efforts on the side of Large Hadron Collider to search for BSM particles on the scale of few TeV, it is possible to perform complimentary searches of the BSM physics using high precision measurements in the parity violating low energy electron scattering. The precision electron-proton or electron-electron scattering asymmetry data measured in the experiments, such as Q-weak, or planned MOLLER experiment at Jefferson laboratory provide a unique opportunity to uncover if there are any new BSM particles do exist. This can be achieved by simply comparing experimental data with the theoretical predictions using the Standard Model as an input. Any inconsistency between theory and experiment will be a strong signal of physics beyond the Standard Model. Currently I am actively involved  in the calculations of the parity-violating  asymmetries with the highest theoretical precision possible within the Standard Model.

  1. 2. Investigation on the origin, dynamics and structure of hadrons requires both experimental and theoretical effort. Chiral Perturbation Theory has been tremendously successful in describing low-energy hadronic interactions in the non-perturbative regime of Quantum Chromodynamics. The main purpose of my research in this area is to take advantage of the symbolic computing methods and to bring subatomic physics computations to the next level by developing a computational models within relativistic Chiral Perturbation Theory. As a result I developed a Computational Hadronic Model which is currently employed in the studies of the dynamical response (electromagnetic polarizabilities) of hadron to the strong external electromagnetic field.

The electromagnetic polarizabilities of a particle characterize the dipole moments induced by the presence of an external electromagnetic field. They therefore constitute fundamental quantities which represent a measure of the rigidity, stiffness or resistance to deformation of the internal structure of this composite system upon imposition of an external electromagnetic field. One of the ways to study response of the hadron to an external electromagnetic field is through a Compton scattering. This allows us to extract fundamental response structure functions such as electric and magnetic polarizabilities, and thus obtain information about the hadron internal degrees of freedom. Values of these polarizabilities are key to understanding of the dynamics of hadron in the external electromagnetic field. For instance just a sign of magnetic polarizability will define whether hadron have paramagnetic or diamagnetic structure. In this project we perform a detailed study of the polarizabilities of all lowest in mass hadrons using newly developed Computations Hadronic Model.

  1. 3.
    Searches of the Dark Matter (DM) requires a clear understanding of the possible signals we can anticipate from the annihilation events of the DM particles. This is a relatively new project, and currently we are in the process of building computational model in which it will be possible to simulate events of the annihilation of DM particles using various theoretical models as input.
 

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Research
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Fall 2016:

Winter 2017:

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