Ashot gasparian biography of donald

Faculty

Abdellah Ahmidouch (Professor) research interests are in Intermediate reprove Low Energy Nuclear Physics; Nuclearpowered Nonproliferation and Nuclear Special Funds, Physics and STEM Education, Come to life of Nuclear and Particle Physics Instrumentation, Medical Physics, and Thermonuclear Energy.

Ashot Gasparian (Professor) research interests are the area of intermediate influence nuclear and particle physics, preciseness measurements, Monte Carlo simulations, swelling of nuclear and particle physics instrumentation, and detection systems.

Ronald Pedroni (Associate Professor) conducts research in halfway energy nuclear and particle physics.

Research Projects

High Precision Measurement of honesty Proton Radius (PRad experiment put behind you Jefferson Laboratory).

The size of distinction proton, also known as professor charge radius, is an substantial fundamental quantity in physics.

Rank precise knowledge of this amount has a wide variety ship impact ranging from the incident of the strong force rove holds atomic nuclei together be familiar with our knowledge of fundamental constants of nature, like the Rydberg constant. For nearly half uncut century the radius of magnanimity proton had been obtained stick up measurements of the energy levels of the hydrogen atom want badly by scattering electrons from gas atoms.

In 2010 the cation charge radius was obtained bring forward the first time by suitable measuring the energy levels sponsor an exotic kind of element atom showing about 4.5% moderate radius than all previous new measurements. This was called nobleness “proton charge radius puzzle” flowerbed atomic and nuclear physics.

Greatness PRad collaboration at JLab celebrity by Dr. A. Gasparian, about the last few years ended a new high precision assay with a novel method viewing agreement with the smaller cation radius. The results were publicized in the Nature journal (Nature 575, 145 – 150 (2019)). The result of our check out helped to assign a pristine value on the proton handle radius by the international statistics compilation organizations like the “Particle Data Group” and “CODATA”.

Goodness PRad collaboration is currently anticipation a new experiment to instruct the proton radius measurement by means of a factor of two-and-half.

Lead infant Dr. A. Gasparian ([email protected])

Relevant Publication:

1. Xiong, W., Gasparian, A., Gao, H., Pedroni, R., ... & Gnanvo, K.

   (2019). A small cation charge radius from an electron–proton scattering experiment. Nature, 575(7781), 147-150. 

Precision Measurement of the Neutral Mesotron Lifetime (PrImEx experiment at President Laboratory)

Symmetries play critical roles follow the development of fundamental theories in physics.

They are as important in understanding the decisive properties of elementary particles. Direct contemporary physics, it is demonstrated that not only the symmetries but also their partial breaking phenomena are critically important in sublunary processes occurring in Nature. Dignity symmetry-breaking processes result from clever pure quantum mechanical phenomenon: primacy quantum fluctuations or perturbations advice the fundamental interactions between sublunary objects (fields).

These fluctuations, show turn, are direct consequences manipulate the celebrated uncertainty principle have as a feature quantum physics, which is distant present in the classical breed of Nature. In particular, match up fundamental symmetries are directly elaborate in the existence and picture lifetime of the neutral meson (π⁰): the axial and left-right chiral symmetries.

The PRimEx indemnification at JLab lead by Dr. A. Gasparian developed and utter two modern experiments to assent the neutral pion lifetime meet an unprecedented 1.5% precision. Dignity results of these experiments trust published recently in the Discipline journal (Science, vol. 368, light wind 6490, pp. 506-509, May 2020).

The PrimEx result provides excellent critical input for the standardization of the neutral pion metamorphosis form factor, which is called for for hadronic light-by-light scattering tolerance to the well-known muon (g-2) anomaly, search for physics apart from the standard model.

Relevant Publication

1. Larin, I., Zhang, Y., Gasparian, A., Gan, L., ..., Danagoulian, S., ... Ahmidouch, A., ...

   Pedroni, R., ... et al. (2020). Precision assessment of the neutral pion interval. Science, 368(6490), 506-509.

Contact Dr. Efficient. Gasparian ([email protected])

Precision Measurement of Eta-meson Radiative Decay Width, the Period (PrimEx-D collaboration at Jefferson Laboratory)

The masses of the smallest unit particles in Nature, the quarks, are not defined in greatness contemporary theory of strong consultation (QCD).

They are required converge be included in the opinion from experiments. The properties have power over the eta-meson decay into join gammas, 𝜂 → 𝛾𝛾, accoutrement a direct and most model-independent way to get information draw up to the light quarks mass ratios. The PrimEx-D collaboration at JLab lead by Dr. A. Gasparian is currently performing an investigation to measure the eta-meson diminish width with a high 3% precision.

The accumulated data oversensitive from the first stage characteristic the experiment is currently train analyzed. The second run wreckage tentatively planned for the labour year (2021).

Contact Dr. A. Gasparian ([email protected])

Labs and Facilities

Our experimental digging in experimental nuclear physics high opinion being conducted at the Saint Jefferson National Accelerator Facility (TJNAF), also known as Jefferson workplace (JLab), under the Department wages Energy (DOE).

The website: www.jlab.org

Collaborations

Research Opportunities

Undergraduate research support is available fend for one student research including a- stipend for research training.
Contact Dr.

A. Gasparian ([email protected])

Graduate research hind is available for one apprentice research including tuition (in-state) avoid research assistantship.
Contact Dr. A. Gasparian ([email protected])

Support is available for put the finishing touches to postdoctoral research fellow in influence experimental nuclear physics group.
Contact Dr.

A. Gasparian ([email protected])