Apr 26 – 30, 2021
Europe/Zurich timezone

Probing Higgs self coupling at the future upgraded LHC

Apr 28, 2021, 5:20 PM
10m
YSF

Speaker

Mr Amit Adhikary (Centre for High Energy Physics, Indian Institute of Science, Bangalore 560012, India)

Description

A direct measurement of the Higgs self coupling is very crucial to understand the nature of electroweak symmetry breaking. This requires an observation of production of Higgs boson pair, which suffers from very low event rate even at the current LHC run. In our work, we study the prospects of observing the Higgs pair production at the high luminosity run of the 14 TeV LHC (HL-LHC) and also the proposed high energy upgrade of the LHC at 27 TeV, namely, HE-LHC. For the HL-LHC study, we choose multiple final states based on the event rate and cleanliness, namely, $b\bar{b}\gamma \gamma$, $b\bar{b} \tau^+ \tau^-$, $b\bar{b} WW^*$, $WW^*\gamma \gamma$ and $4W$ channels and do a collider study by employing a cut-based as well as multivariate analyses using the Boosted Decision Tree (BDT) algorithm. In case of HE-LHC study, we select various di-Higgs final states based on their cleanliness and production rates, namely, $b\bar{b}\gamma\gamma$, $b\bar{b}\tau^{+}\tau^{-}$, $b\bar{b}WW^{*}$, $WW^{*}\gamma\gamma$, $b\bar{b}ZZ^{*}$ and $b\bar{b}\mu^{+}\mu^{-}$ channels. We adopt multivariate analyses using BDT algorithm, the XGBoost toolkit and Deep Neural Network (DNN) for the signal-background discrimination. Also, we perform a study on the ramifications of varying the self-coupling of Higgs boson from its Standard Model (SM) value. (arXiv: 1712.05346, 2006.11879)

Primary authors

Mr Amit Adhikary (Centre for High Energy Physics, Indian Institute of Science, Bangalore 560012, India) Dr Shankha Banerjee (CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland) Dr Rahool Kumar Barman (Department of Physics, Oklahoma State University, Stillwater, Oklahoma, 74078, USA) Dr Biplob Bhattacherjee (Centre for High Energy Physics, Indian Institute of Science, Bangalore 560012, India) Dr Saurabh Niyogi (Gokhale Memorial Girls' College, 1/1, Harish Mukherjee Road, Kolkata 700020, India)

Presentation materials