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The Higgs Field and Higgs Boson: Key Insights and Implications
Introduction to the Higgs Field and Higgs Boson
The Higgs field and Higgs boson are fundamental components of the Standard Model of particle physics. The Higgs field is a scalar field that permeates the universe, and its interactions with particles give them mass. The Higgs boson is the quantum excitation of this field, discovered at CERN in 2012 with a mass of 125 GeV .
Higgs Field as an Inflaton
Higgs Field and Early Universe Inflation
The Higgs field can potentially drive the inflationary expansion of the early universe if it is non-minimally coupled to gravity. This model aligns well with current Cosmic Microwave Background (CMB) observations and has significant implications for the Higgs boson mass . However, the quantization of this model presents challenges, and further research is needed to address these issues .
Naturalness and Validity of Higgs Inflation
While the idea of the Higgs boson driving inflation is appealing, it requires a strong coupling to the Ricci curvature scalar. This approach, however, becomes problematic beyond a certain cutoff scale, necessitating an understanding of the ultraviolet completion of the Standard Model. Without this, the scenario suffers from significant fine-tuning issues, undermining its naturalness .
Higgs Boson Production and Interactions
Effective Field Theory and Higgs Boson Plus Jet Production
Using an effective field theory (EFT) that includes gluon-Higgs operators, researchers have studied Higgs boson plus jet production at next-to-leading order (NLO) QCD. This approach helps understand the effects of a finite top quark mass and potential Beyond-the-Standard Model (BSM) modifications of Higgs-gluon couplings. The EFT framework allows for precise predictions and highlights the significance of certain operators at high transverse momentum (p_T) .
Next-to-Next-to-Leading Order Predictions
Further advancements in Higgs boson production studies include next-to-next-to-leading order (NNLO) QCD corrections. These corrections provide more accurate predictions for Higgs boson production in association with a jet, reducing scale dependence and enhancing the total production rate by about 20% compared to NLO predictions .
Higgs Boson and New Physics
Coupling to Dark Matter and Neutrinos
The Higgs field may couple to new physics sectors, such as dark matter and massive neutrinos. A novel signature involving boosted di-Higgs-boson plus missing transverse energy (E_T) could probe these new sectors. This signature is particularly relevant in models like supersymmetry and low-scale seesaw mechanisms, offering a clear background for detection at the LHC .
Implications for Cosmology and Dark Matter
The Higgs boson plays a crucial role in understanding the universe's fundamental aspects, including dark energy, dark matter, and potential phase transitions in the early universe. The Higgs potential is closely linked to the cosmological constant and baryogenesis, making it central to our comprehension of the physical universe .
Conclusion
The Higgs field and Higgs boson are pivotal in both particle physics and cosmology. From driving early universe inflation to probing new physics sectors, their study continues to provide profound insights. Ongoing and future experiments at facilities like the LHC are essential for further unraveling the mysteries of the Higgs field and its implications for the universe.
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