Trambak Jyoti Chall, M.Sc.

ORCID: 0000-0002-5932-278X

The topic of my dissertation is: „Theory and phenomenology of particle production in photon-photon and photon induced diffractive processes”

Research topic description:

The ultimate goal of research in this field is to address one of the most fundamental questions in particle physics—unraveling the theoretical description of the internal dynamics and multidimensional distribution of quarks and gluons (collectively known as partons) within particles such as protons (a type of baryon, or more specifically, a nucleon) and pions (a type of meson). These particles are collectively referred to as hadrons.

In my research, I aim to investigate particle production processes within the framework of Quantum Chromodynamics (QCD). Such interaction processes can generally be factorized, according to the collinear or kT factorization schemes, into a convolution of a hard-scattering part—perturbatively calculable—and a soft-hadronization part that describes the internal structure of the probed hadron. The latter encompasses essential non-perturbative effects required for a complete understanding of hadronic structure and can be encoded in multidimensional functions such as Generalized Parton Distributions (GPDs), Generalized Transverse Momentum Dependent Distributions (GTMDs), and Generalized Distribution Amplitudes (GDAs).

While inclusive processes have provided valuable insights into the partonic content of hadrons, a full multi-dimensional structural description necessitates the study of exclusive processes where the final state is fully defined. When we zoom into such particle interactions that probe the hadronic structure, we identify the subprocesses at the „quark-level” wherein we are particularly interested in those that are photon-induced. The hard and exclusive diffractive processes in the lepton-hadron collision sector are of prime interest to us in this context. These processes can be simulated using computational techniques such as Monte Carlo methods.

Such particle processes have significant phenomenological implications and will be studied in future collider experiments, including the proposed Large Hadron–Electron Collider (LHeC) at CERN, Geneva, and the Electron–Ion Colliders (EIC) at Brookhaven National Laboratory in the USA and the EIC in China (EicC). At the EIC, electron–proton and electron–nucleus collisions can be explored at high luminosities using polarized beams, for center-of-mass energies in the broad range of 20–140 GeV, enabling detailed studies of the internal structure of nucleons as described above.

InspireHEP: https://inspirehep.net/authors/2070352?ui-citation-summary=true

Publications:

1. A. K. Alok, T. J. Chall, N. R. S. Chundawat and A. Mandal, ”Spin-flavor oscillations of relic neutrinos in primordial magnetic field,” Phys. Rev. D 109, 055011 (2024)

2. A. K. Alok, T. J. Chall, N. R. S. Chundawat, S. Gangal and G. Lambiase, ”Quantum coherence in neutrino spin-flavor oscillations,” Phys. Rev. D 111, 036015 (2025)