專題演講

2018/08/24(Fri)     11:00 -12:30    7th Floor(P7F)

Title

Higgs-boson-pair production H(→ bb)H(→ γγ) from gluon fusion at the HL-LHC and HL-100 TeV hadron collider

Speaker

Dr. Jubin Park

Institute for Universe and Elementary Particles, Chonnam National University

Abstract

We perform the most up-to-date comprehensive signal-background analysis for Higgs-pair pro-duction in HH → bbγγ channel at the HL-LHC and HL-100 TeV hadron collider, with the goal of probing the self-coupling λ3H of the Higgs boson. We simulate all the standard-model signal and background processes with the simulation tools almost as sophisticated as what experimen-talists are using. We find that even for the most promising channel HH → bbγγ at the HL-LHC with a luminosity of 3000 fb−1, the significance is still not high enough to establish the Higgs self-coupling at the standard model (SM) value. Instead, we can only constrain the self-coupling to −1.0 < λ_{3H} < 7.6 at 95% confidence level after considering the uncertainties associated with the top-Yukawa coupling and the estimation of backgrounds. Here we also extend the study to the HL-100 TeV hadron collider. With a luminosity of 3 ab−1, we find there exists a bulk region of 2.6 < λ_{3H} < 4.8 in which one cannot pin down the trilinear coupling. Otherwise one can measure the coupling with a high precision. At the SM value, for example, we show that the coupling can be measured with about 20 % accuracy. While assuming 30 ab−1, the bulk region reduces to 3.1 < λ_{3H} < 4.3 and the trilinear coupling can be measured with about 7 % accuracy at the SM value.