Sergey Koshkarev "A phenomenological feasibility study of the possible impact of the intrinsic heavy quark (charm) mechanism on the production of doubly heavy mesons and baryons"

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View all other units

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Date:

14.05.2020 - 16:15

On 14 May 2020 at 16:15 Sergey Koshkarev will defend his doctoral thesis in physics "A phenomenological feasibility study of the possible impact of the intrinsic heavy quark (charm) mechanism on the production of doubly heavy mesons and baryons".

Supervisor:
Dr. Stefan Groote, University of Tartu

Opponents:
Prof. Paul Hoyer, University of Helsinki, Helsinki, Finland
Prof. Boris Kopeliovich, Federico Santa Maria University, Valparaiso, Chile

Summary
When people hear about the Large Hadron Collider (LHC) at CERN, they are used to think about the Higgs boson, Dark Matter and other “mysteries”. However, those of us involved in scientific research related to collider physics know that one of the main topics at the LHC is to look for the structure of the proton. Just imagine that almost 100% of our mass is not the mass of the atoms we are built of but the mass of a small part of them, namely the nucleus built up by protons and neutrons. Current experiments are focused mainly on the part of the proton structure which caries a small part of the proton momentum or on the dynamics of such parts. However, some experimental data provide evidences for the possible importance of physics at high momentum fractions, dealt with in the so called intrinsic charm (IC) model. Unfortunately, the interpretation of such data is not clear and quite speculative. One of the final states for physics at high momentum fractions is the J/ψ meson, constitued by a charm–anticharm quark pair. The J/ψ meson was discovered in 1971, but its production properties are still very questionable. Using IC, in chapter III we are trying to find a correct interpretation for the experimental data obtained by NA3 (CERN). We also prepare theoretical foundations for a correct interpretation of the current researches at the COMPASS experiment (CERN) and the future experiment AFTER@LHC. The SELEX (FermiLab) measurements of the production of doubly charmed baryons are among the most intriguing and surprising results in modern baryonic physics. Even the most recent LHCb (CERN) results are not helpful to resolve that mystery. In chapter IV, we resolved the SELEX data puzzle with IC. Probably, to this moment the reader is already suspecting that data interpretation is rather important. Recently, the LHCb collaboration tried to search for evidence for the IC in their data. Unfortunately, their result is based on the misunderstanding of the IC kinematic properties. In chapter V, we give an interpretation of the LHCb data and provide a theoretical foundation for a future experimental search.

Organizer:

Laur Järv

Location:

MS Teams https://teams.microsoft.com/l/team/19%3ab63a455c97b64018bcd011f7b3a9b26d%40thread.tacv2/conversations?groupId=236e34e4-b082-4352-833b-d01d307b7fd2&tenantId=6d356317-0d04-4abc-b6b6-8c9773885bb0

URL:

dspace.ut.ee/handle/10062/67314

Event category:

Defence

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Sergey Koshkarev "A phenomenological feasibility study of the possible impact of the intrinsic heavy quark (charm) mechanism on the production of doubly heavy mesons and baryons"

April