New Physics in LHC Higgs boson pair production

Topic

natural sciences

Frequently Asked Questions (FAQ)

What is the significance of multi-Higgs production at the LHC? Multi-Higgs production offers a direct probe into the electroweak symmetry breaking (EWSB) sector, providing insights beyond what single Higgs boson measurements can offer. While triple Higgs production is currently beyond the LHC’s reach, di-Higgs production shows promise for exploration.
How does the Higgs portal model affect di-Higgs production? The Higgs portal model introduces a hidden sector Higgs field that interacts with the Standard Model Higgs field. This interaction can significantly enhance di-Higgs production rates, both resonantly and non-resonantly, due to modifications in the trilinear Higgs coupling. Measuring these couplings allows for a reconstruction of the Higgs potential, providing valuable information about the hidden sector.
What role does di-Higgs production play in exploring the MSSM at small tan β? In the Minimal Supersymmetric Standard Model (MSSM) with small tan β, the heavier CP-even Higgs boson (H) can have a substantial branching ratio into a pair of lighter Higgs bosons (h). This scenario resembles the Higgs portal model in its phenomenology. Measuring resonant and non-resonant di-Higgs production rates provides a way to determine the MSSM parameters α and β, indirectly constraining stop masses and mixing.
How does the interpretation of the Higgs boson as a pseudo-dilaton impact di-Higgs production? If the observed Higgs boson is a pseudo-dilaton, the di-dilaton production cross section is generally much larger than in the Standard Model. However, the observability of this enhancement depends on the UV properties of the theory. In a fully composite scenario, the branching ratios into observable final states can be suppressed, making detection challenging. Conversely, models with additional fermion families, like a four-family scenario, can enhance the observability of di-dilaton events.
What are the challenges in observing di-dilaton production? One of the main challenges is the large QCD background associated with the dilaton’s preferred decay into gluons. Distinguishing di-dilaton events from this background requires careful analysis, potentially leveraging boosted kinematics and higher dimensional operators that affect the transverse momentum spectrum.
What distinguishes composite Higgs models from the pseudo-dilaton scenario in di-Higgs production? Composite Higgs models typically predict significant enhancements in di-Higgs and di-Higgs+jet production cross sections. The presence of heavy top partners introduces a new mass scale, further amplifying the enhancement, particularly at large transverse momenta. This striking enhancement differentiates composite Higgs models from the pseudo-dilaton scenario, where the observability of di-dilaton events is highly model-dependent.
What is the importance of the hh + jet final state in studying di-Higgs production? The hh + jet final state offers a powerful handle for analyzing di-Higgs production. The additional jet provides kinematic constraints that help suppress backgrounds and improve signal sensitivity. This is particularly important in scenarios where the di-Higgs signal is otherwise challenging to extract, such as in composite Higgs models or specific pseudo-dilaton scenarios.
What are the overall conclusions and prospects for future studies? Investigating di-Higgs and di-Higgs+jet production at the LHC is crucial for understanding the mechanism of EWSB. Resonant models, like the Higgs portal and MSSM scenarios, offer opportunities to probe extended Higgs sectors. Non-resonant models, like composite Higgs and pseudo-dilaton scenarios, present distinct predictions for di-Higgs production rates. Future studies at the LHC, particularly with a luminosity upgrade, are poised to provide a clearer picture of the Higgs boson’s nature and its role in EWSB.

Significance

Understanding these findings helps advance our knowledge and inform better decisions. This research represents an important contribution to the field. For the full details, watch the video above and explore the linked resources.

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new physics in lhc higgs boson pair production

ResearchLounge

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