Mass of higgs particle
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Mass of the Higgs Particle: A Comprehensive Overview
Introduction to Higgs Particle Mass
The Higgs boson, a fundamental particle in the Standard Model of particle physics, has been the subject of extensive research. Its mass is a critical parameter that influences various aspects of particle physics and cosmology. This article synthesizes findings from multiple studies to provide a clear understanding of the Higgs particle's mass.
Measurement of the Higgs Boson Mass
Combined Data from ATLAS and CMS Experiments
The most precise measurement of the Higgs boson mass comes from the combined data of the ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC). These experiments analyzed the Higgs boson decays into two photons (H→γγ) and four leptons (H→ZZ→4ℓ). The combined measured mass of the Higgs boson is 125.09 ± 0.21 (stat) ± 0.11 (syst) GeV . Another study combining data from the same decay channels during LHC Run 2 reported a Higgs boson mass of 125.11 ± 0.09 (stat) ± 0.06 (syst) GeV, achieving a precision of 0.09% .
Constraints from Top Quark and W Boson Masses
The masses of the top quark (Mt) and W boson (MW) provide constraints on the Higgs boson mass. Precise measurements of Mt and MW suggest a most likely Higgs mass range of 117 GeV, with an upper limit of 251 GeV at the 95% confidence level Dashen1983Okada2007. These constraints are crucial for validating the Standard Model and guiding experimental searches.
Theoretical Bounds on Higgs Mass
Lower Bounds from Astrophysical Considerations
Astrophysical phenomena also provide lower bounds on the Higgs mass. For instance, the requirement that the Higgs particle's effects on primordial nucleosynthesis, microwave background, and stellar evolution do not disrupt these processes sets a lower bound of approximately 0.2 MeV .
Upper Bounds from Triviality and Vacuum Stability
Theoretical models, such as those considering the triviality of φ^4 theory in four dimensions, suggest that the Higgs mass is bounded from above. These models propose that the Higgs mass in the minimal model is constrained without needing detailed knowledge of short-distance physics . Additionally, studies on vacuum stability and triviality in the context of a fourth generation of chiral matter allow Higgs masses between 115-315 GeV at the 68% confidence level and up to 750 GeV at the 95% confidence level .
Implications for Supersymmetry (SUSY)
Predictions from Minimal Supersymmetric Standard Model (MSSM)
In the MSSM, the mass of the light CP-even Higgs boson (Mh) can be predicted from other model parameters. High-precision predictions, combining fixed-order results with resummation of leading and subleading logarithmic contributions, suggest a Higgs mass around 126 GeV, consistent with experimental observations . These results support the idea that the measured Higgs mass may indicate the presence of SUSY at some scale .
Conclusion
The mass of the Higgs boson, precisely measured at around 125 GeV, is a cornerstone of modern particle physics. This value is consistent with constraints from top quark and W boson masses, theoretical bounds, and predictions from supersymmetric models. Ongoing research continues to refine these measurements and explore their implications for our understanding of fundamental physics.
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