Welcome to High Energy Physics Laboratory

We conduct research in the field of theoretical particle physics (or high energy physics) in order to understand the "Nature" at the most fundamental level. Specifically, we are interested in understanding the srtucture of hadrons ( i.e. proton, neutron, mesons etc.) by analyzing the behaviour of the partons (quarks and gluons collectively) inside the hadrons. Quarks and gluons are the fundamental constituent particles found inside the hadrons. Inside the hadron the quarks are held together by the strong force in a similar way as molecules are held together by the electromagnetic force. The mediating particle which is responsible for holding the quarks together is known as gluon. The underlying theory which studies the dynamics of quarks and gluons inside the hadron is known as the Quantum Chromodynamics (QCD).

Probing the structure of proton can be done by means of high energy collisions at the accelerators like the HERA ( Hadron Elektron Ring Anlage ) at DESY in Germany, TEVATRON at Fermilab in Batavia, Illinois of U.S.A., RHIC ( Relativistic Heavy Ion Collider ) in Brookhaven National Laboratory ( BNL) in Upton, New York, U.S.A., SLAC ( Stanford Linear Accelerator Center ) at SLAC National Accelerator Laboratory in California of U.S.A., and LHC ( The Large Hadron Collider ) at CERN in Geneva, Switzerland. Deep inelastic scattering ( DIS ) processes such as ep and pp serve as the basic tools to explore the structure of proton.

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Figure shows Deep inelastic scattering of an electron with the nucleon (here proton). The electon imparts a four momentum to the target proton. This four momentum is carried by the exchanged virtual photon. The proton can be seen as a composite particle having partons as constituents inside it. The virtual photon interacts with one of the parton and transfers the four momentum to it. The nucleon then breaks up into parts producing a proton and several mesons.

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Prof. Jayanta Kumar Sarma

The HEP research group is led by Dr. Jayanta Kumar Sarma. Dr. JKS is working as a Professor in the Dept. of Physics, Tezpur university. He obtained his Ph.D degree from Gauhati University. He has published over 60 research papers in reputed journals till date and authored a number of book chapters. Apart from high energy physics, he has keen interest in Assamese literature too. He has translated the famous and widely celebrated book "Principia of Sir Isaac Newton" into Assamese language (currently in the press). His articles written in Assamese language ranging from literary work, social issues to popular science have been regularly published in various Assamese news papers of Assam.

The main research areas of this lab are highlighted below:

  • Hadron and Lepton structure
  • QCD Phenomenology
  • Small-x Physics
  • X-ray analysis of AGNs