| Description: | [DPS Seminar] Dr. Jayita Lahiri (DESY, Germany) -- Optimal Observable Technique in New Physics Estimation |
| Date: | Thursday, Jan 25, 2024 |
| Time: | 2:30 p.m. - 4 p.m. |
| Venue: | Asima Chatterjee Lecture Theatre |
| Details: | We study the anomalous $ZZ\gamma$ and $Z\gamma\gamma$ couplings that can be probed via $Z\gamma$ production at the $e^+e^-$ colliders. We take Standard Model Effective Field Theory (SMEFT) approach to examine these anomalous neutral triple gauge couplings in a model independent way. We adopt optimal observable technique to extract the sensitivity at which these anomalous couplings can be probed at future $e^+e^-$ colliders and then compare the results with the latest experimental limit obtained at the LHC. We also study the impact and advantage of beam polarization in these precision measurements. Statistical limit (95\% C.L.) on individual anomalous couplings as well as the correlation between various couplings have been discussed in detail. We further develop a numerical technique for the optimal estimation of the new physics (NP) couplings applicable to any collider process without any simplifying assumptions. This approach also provides a way to measure the quality of the NP estimates derived using standard $\chi^2$ analysis and can be used to gauge the advantages of various modalities of collider design and we illustrate the techniques and arguments by considering the pair production of heavy charged fermions at an $e^+e^-$ collider in presence of SM background. |
| Calendar: | Seminar Calendar (entered by rajni) |