TY - JOUR
T1 - Scrutinizing the Higgs quartic coupling at a future 100 TeV proton–proton collider with taus and b-jets
AU - Fuks, Benjamin
AU - Kim, Jeong Han
AU - Lee, Seung J.
N1 - Funding Information:
We are very grateful to Minho Son for valuable help and discussions, in particular on tau reconstruction, as well as to K.C. Kong, Ian M. Lewis and Graham Wilson for useful comments and suggestions during the course of this project. We also thank the HTCaaS group of the Korea Institute of Science and Technology Information (KISTI) for providing the necessary computing resources and acknowledge the Korea Future Collider Study Group (KFCSG) for motivating us to proceed with this work. JHK is supported in part by US-DOE (DE-FG02-12ER41809) and by the University of Kansas General Research Fund allocation 2302091. SL is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. NRF-2015R1A2A1A15052408), and by the Korean Research Foundation (KRF) through the Korea-CERN collaboration program (NRF-2016R1D1A3B01010529). The work of BF is partly supported by French state funds managed by the Agence Nationale de la Recherche (ANR), in the context of the LABEX ILP (ANR-11-IDEX-0004-02, ANR-10-LABX-63), and by the FKPPL initiative of the CNRS.
Publisher Copyright:
© 2017 The Authors
PY - 2017/8/10
Y1 - 2017/8/10
N2 - The Higgs potential consists of an unexplored territory in which the electroweak symmetry breaking is triggered, and it is moreover directly related to the nature of the electroweak phase transition. Measuring the Higgs boson cubic and quartic couplings, or getting equivalently information on the exact shape of the Higgs potential, is therefore an essential task. However, direct measurements beyond the cubic self-interaction of the Higgs boson consist of a huge challenge, even for a future proton–proton collider expected to operate at a center-of-mass energy of 100 TeV. We present a novel approach to extract model-independent constraints on the triple and quartic Higgs self-coupling by investigating triple Higgs-boson hadroproduction at a center-of-mass energy of 100 TeV, focusing on the ττbb¯bb¯ channel that was previously overlooked due to a supposedly too large background. It is thrown into sharp relief that the assist from transverse variables such as mT2 and a boosted configuration ensures a high signal sensitivity. We derive the luminosities that would be required to constrain given deviations from the Standard Model in the Higgs self-interactions, showing for instance that a 2σ sensitivity could be achieved for an integrated luminosity of 30 ab−1 when Standard Model properties are assumed. With the prospects of combining these findings with other triple-Higgs search channels, the Standard Model Higgs quartic coupling could in principle be reached with a significance beyond the 3σ level.
AB - The Higgs potential consists of an unexplored territory in which the electroweak symmetry breaking is triggered, and it is moreover directly related to the nature of the electroweak phase transition. Measuring the Higgs boson cubic and quartic couplings, or getting equivalently information on the exact shape of the Higgs potential, is therefore an essential task. However, direct measurements beyond the cubic self-interaction of the Higgs boson consist of a huge challenge, even for a future proton–proton collider expected to operate at a center-of-mass energy of 100 TeV. We present a novel approach to extract model-independent constraints on the triple and quartic Higgs self-coupling by investigating triple Higgs-boson hadroproduction at a center-of-mass energy of 100 TeV, focusing on the ττbb¯bb¯ channel that was previously overlooked due to a supposedly too large background. It is thrown into sharp relief that the assist from transverse variables such as mT2 and a boosted configuration ensures a high signal sensitivity. We derive the luminosities that would be required to constrain given deviations from the Standard Model in the Higgs self-interactions, showing for instance that a 2σ sensitivity could be achieved for an integrated luminosity of 30 ab−1 when Standard Model properties are assumed. With the prospects of combining these findings with other triple-Higgs search channels, the Standard Model Higgs quartic coupling could in principle be reached with a significance beyond the 3σ level.
UR - http://www.scopus.com/inward/record.url?scp=85020198574&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2017.05.075
DO - 10.1016/j.physletb.2017.05.075
M3 - Article
AN - SCOPUS:85020198574
SN - 0370-2693
VL - 771
SP - 354
EP - 358
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -