Exploring sizable triple Higgs couplings in the 2HDM
- PDF / 9,243,374 Bytes
- 33 Pages / 595.276 x 790.866 pts Page_size
- 43 Downloads / 180 Views
Regular Article - Theoretical Physics
Exploring sizable triple Higgs couplings in the 2HDM F. Arco1,2,a , S. Heinemeyer2,3,4,b , M. J. Herrero1,2,c 1
Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 3 Campus of International Excellence UAM + CSIC, Cantoblanco, 28049 Madrid, Spain 4 Instituto de Física de Cantabria (CSIC-UC), 39005 Santander, Spain
2
Received: 28 May 2020 / Accepted: 20 August 2020 © The Author(s) 2020
Abstract An important task at future colliders is the measurement of the triple Higgs coupling. Depending on its size relative to the Standard Model (SM) value, certain collider options result in a higher experimental accuracy. Within the framework of Two Higgs Doublet Models (2HDM) types I and II we investigate the allowed ranges for all triple Higgs couplings involving at least one light, SM-like Higgs boson. We take into account theoretical constraints (unitarity, stability), experimental constraints from direct Higgs-boson searches, measurements of the SM-like Higgs-boson properties, flavor observables and electroweak precision data. We find that the SM-type triple Higgs coupling w.r.t. its SM value, λhhh /λSM , can range between ∼ −0.5 and ∼ 1.5. Depending on which value is realized, the HL-LHC can compete with, or is clearly inferior to the ILC. We find the coupling λhh H between ∼ −1.5 and ∼ 1.5. Triple Higgs couplings involving two heavy Higgs bosons, λh H H , λh A A and λh H + H − can reach values up to O(10), roughly independent of the 2HDM type. This can lead to potentially strongly enhanced production of two Higgs-bosons at the HL-LHC or high-energy e+ e− colliders.
1 Introduction In 2012 the ATLAS and CMS collaborations have discovered a new particle that – within theoretical and experimental uncertainties – is consistent with the existence of a StandardModel (SM) Higgs boson at a mass of ∼ 125 GeV [1–3]. No conclusive signs of physics beyond the SM have been found so far at the LHC. However, the measurements of Higgsboson couplings, which are known experimentally to a precision of roughly ∼ 20%, leave room for Beyond Standarda e-mail:
[email protected]
b e-mail:
[email protected] (corresponding author)
c e-mail:
[email protected]
0123456789().: V,-vol
Model (BSM) interpretations. Many BSM models possess extended Higgs-boson sectors. Consequently, one of the main tasks of the LHC Run III and beyond is to determine whether the observed scalar boson forms part of the Higgs sector of an extended model. A key element in the investigation of the Higgs-boson sector is the measurement of the trilinear Higgs coupling of the SM-like Higgs boson, λhhh (for recent reviews on Higgs couplings measurements at future colliders see [4,5]). In the case of a BSM Higgs-boson sector, equally important is the measurement of BSM trilinear Higgs-boson couplings. Most experimental studies assume the SM value of λhhh . However, in BSM mo
Data Loading...
