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27–28 Jan 2024
IISER Mohali
Asia/Kolkata timezone

Two-loop form factors for Dark Matter annihilation to colored Standard Model particles

28 Jan 2024, 11:30
20m
LHC (IISER Mohali)

LHC

IISER Mohali

Lecture Hall Complex, IISER Mohali, Sector 81, SAS Nagar, Mohali -140306

Speaker

Mr Warsimakram I K (Indian Institute of Science Education and Research, Mohali)

Description

A UV complete model where the Dark Matter (DM) particle interacts with gluons via a colored scalar mediator provides a viable phenomenological model that can be tested at hadron colliders. While Mono-jet signatures are relevant for Collider searches, zero-jet processes would mean complete annihilation of Standard Model (SM) particles to DM particles, which contribute to relic-density of DM. We look at the DM annihilation to SM colored particles which, at leading order, is a loop induced process in our model. We compute two-loop amplitudes in QCD which contribute to the process. Decomposing the amplitude in terms of Form factors and making use of the projector technique, scalar Feynman Integrals are obtained. Further, with the help of the IBP identities, an analytical expression for amplitude is obtained in terms of Master Integrals. The amplitude is made UV finite by Counterterm Renormalization. We will discuss preliminary results for the cases of massless and massive mediators. Our results can be used to predict DM pair production at hadron colliders and DM annihilation to SM colored particles at next-to-leading order in QCD.

Author

Mr Warsimakram I K (Indian Institute of Science Education and Research, Mohali)

Co-author

Dr Ambresh Shivaji (Indian Institute of Science Education and Research, Mohali, India)

Presentation materials

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