Kirtimaan Mohan
Assistant Professor of Physics Michigan State University
- East Lansing MI
Kirtimaan Mohan's research interests are in new physics beyond the Standard Model, dark matter and collider phenomenology.
Biography
Industry Expertise
Areas of Expertise
Accomplishments
Teacher-Scholar Award, Michigan State University
2023
Education
Indian Institute of Science
Ph.D.
Physics
News
Faculty across campus recognized for Excellence in Teaching with Technology
Michigan State University online
2023-04-11
Kirtimaan Mohan, Kathleen Hinko, Vashti Sawtelle, Lyman Briggs College: Studio Physics (LB 273 & LB 274) — Used a flipped classroom structure and ensured the course was interactive and collaborative in an online synchronous classroom.
Journal Articles
Symmetries, spin-2 scattering amplitudes, and equivalence theorems in warped five-dimensional gravitational theories
Physical Review D2024
Building on work by Hang and He, we show how the residual five-dimensional diffeomorphism symmetries of compactified gravitational theories with a warped extra dimension imply equivalence theorems which ensure that the scattering amplitudes of helicity-0 and helicity-1 spin-2 Kaluza-Klein states equal (to leading order in scattering energy) those of the corresponding Goldstone bosons present in the ’t-Hooft-Feynman gauge. We derive a set of Ward identities that leads to a transparent power-counting of the scattering amplitudes involving spin-2 Kaluza-Klein states.
Scattering amplitudes of massive spin-2 Kaluza-Klein states with matter
Physical Review DWe perform a comprehensive analysis of the scattering of matter and gravitational Kaluza-Klein (KK) modes in five-dimensional gravity theories. We consider matter localized on a brane as well as in the bulk of the extra dimension for scalars, fermions and vectors respectively, and consider an arbitrary warped background. While naive power counting suggests that there are amplitudes which grow as fast as
Spin-2 Kaluza-Klein scattering in a stabilized warped background
Physical Review D2023
Scattering amplitudes involving massive spin-2 particles typically grow rapidly with energy. In this paper we demonstrate that the anomalous high-energy growth of the scattering amplitudes cancel for the massive spin-2 Kaluza-Klein modes arising from compactified five-dimensional gravity in a stabilized warped geometry. Generalizing previous work, we show that the two sum rules which enforce the cancellations between the contributions to the scattering amplitudes coming from the exchange of the (massive) radion and those from the exchange of the tower of Goldberger-Wise scalar states (admixtures of the original gravitational and scalar fields of the theory) still persist in the case of the warping which would be required to produce the hierarchy between the weak and Planck scales in a Randall-Sundrum model.
The forward physics facility at the high-luminosity LHC
Journal of Physics G: Nuclear and Particle Physics2023
High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region.
Erratum to: Direct detection and LHC constraints on a t-channel simplified model of Majorana dark matter at one loop
Journal of High Energy Physics2023
We have detected an error in our code that occurred while reading in spin independent (SI) Xenon1T constraints. This bug affects the spin independent constraints and decreases the constraint on the dark matter coupling gDM by an order of magnitude in some regions of parameter space. This does not affect our conclusions in the paper that the spin independent constraints are dominant for large dark matter mass, nor does it affect the general pattern of these constraints, namely, that they are strong when the mass of dark matter and mediator are not too different. However, the exact region of parameter space where SI constraints dominate collider and spin dependent constraints changes and as a result, as do the numerical values of gDM on our figures.
