Journal Article

PUBDB-2024-00480

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sensitivity to triple Higgs couplings via di-Higgs production in the 2HDM at the (HL-)LHC

Arco, F. ; Heinemeyer, S. (Corresponding author)Extern* ; Mühlleitner, M. ; Radchenko, K.DESY*

2023
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1140/epjc/s10052-023-12193-4  doi:10.3204/PUBDB-2024-00480

Report No.: DESY-22-203; IFT-UAM/CSIC-22-073; KA-TP-30-2022; arXiv:2212.11242

Abstract: An important task of the LHC is the investigation of the Higgs-boson sector. Of particular interest is the reconstruction of the Higgs potential, i.e. the measurement of the Higgs self-couplings. Based on previous analyses, within the 2-Higgs-Doublet Model (2HDM) type I, we analyze several two-dimensional benchmark planes that are over large parts in agreement with all theoretical and experimental constraints. For these planes we evaluate di-Higgs production cross sections at the (HL-)LHC with a center-of-mass energy of $14 \,\, \textrm{TeV}$ at next-to-leading order in the heavy top-quark limit with the code HPAIR. We investigate in particular the process $gg \rightarrow hh$, with h being the Higgs boson discovered at the LHC with a mass of about $125 \,\, \textrm{GeV}$. The top box diagram of the loop-mediated gluon fusion process into Higgs pairs interferes with the s-channel exchange of the two ${\mathcal{C}\mathcal{P}}$-even 2HDM Higgs bosons h and H. The latter two involve the triple Higgs couplings (THCs) $\lambda _{hhh}$ and $\lambda _{hhH}$, respectively, possibly making them accessible at the HL-LHC. Depending on the size of the involved top-Yukawa and THCs as well as on the mass of H, the contribution of the s-channel H diagram can be dominating or be highly suppressed. We find regions of the allowed parameter space in which the di-Higgs production cross section can differ by many standard deviations from its SM prediction, indicating possible access to deviations in $\lambda _{hhh}$ from the SM value $\lambda _{\textrm{SM}}$ and/or contributions involving $\lambda _{hhH}$. The sensitivity to the beyond-the-SM (BSM) THC $\lambda _{hhH}$ is further analyzed employing the $m_{hh}$ distributions. We demonstrate how a possible measurement of $\lambda _{hhH}$ depends on the various experimental uncertainties. Depending on the underlying parameter space, the HL-LHC may have the option not only to detect BSM THCs, but also to provide a first rough measurement of their sizes.

Keyword(s): Higgs particle: doublet: 2 ; potential: Higgs ; coupling: Higgs ; top: coupling ; Higgs particle: pair production ; gluon: fusion ; sensitivity ; CERN LHC Coll: upgrade ; numerical calculations ; new physics

Note: 43 pages, 26 figures

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)
3. HIDDeN - Hunting Invisibles: Dark sectors, Dark matter and Neutrinos (860881) (860881)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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Database coverage:
; ; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Arco, F. (Corresponding author) ; Heinemeyer, S. (Corresponding author)Extern* ; Mühlleitner, M. ; Radchenko Serdula, K.DESY*
Sensitivity to Triple Higgs Couplings via Di-Higgs Production in the 2HDM at the (HL-)LHC
[10.3204/PUBDB-2022-07759]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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