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Two-loop virtual top-quark effect on Higgs-boson decay to bottom quarks
Mathias Butenschön1, Frank Fugel, Bernd A Kniehl
1II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Physical Review Letters
|March 16, 2007
Summary
The study details the dominant two-loop electroweak correction to the Higgs boson decaying into bottom quarks. This correction significantly amplifies previous findings, enhancing the decay width beyond strong-interaction screening effects.
Area of Science:
- High Energy Physics
- Particle Physics
- Quantum Field Theory
Background:
- The Standard Model Higgs boson is a fundamental particle.
- Higgs boson decays are crucial for understanding particle physics.
- Previous studies identified one-loop corrections to Higgs decays.
Purpose of the Study:
- To calculate the dominant two-loop electroweak correction to the Higgs boson decay width into bottom quarks.
- To analyze the impact of these corrections on the decay width.
- To compare electroweak corrections with strong-interaction effects.
Main Methods:
- Analytic calculation of two-loop electroweak corrections.
- Perturbative quantum field theory techniques.
- Evaluation of terms of order O(GF^2*m_t^4).
Main Results:
- The dominant two-loop electroweak correction amplifies the decay width.
- This amplification is approximately +16%, exceeding the one-loop correction.
- The two-loop effect compensates for strong-interaction screening (-8%).
Conclusions:
- Two-loop electroweak corrections are significant for Higgs boson decays to bottom quarks.
- These corrections play a vital role in precise predictions for the Standard Model.
- The findings refine our understanding of Higgs boson properties and interactions.
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