Discussion Overview
The discussion centers on the predictions for the Higgs mass across various theoretical models, including the Standard Model (SM), Minimal Supersymmetric Standard Model (MSSM), next-to-Minimal Supersymmetric Standard Model (nMSSM), little Higgs, and split supersymmetry. Participants explore the expected mass ranges and the implications of different theoretical frameworks.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant asks for expert predictions regarding the Higgs mass in various models, suggesting a range of 114-1000 GeV and expressing uncertainty about specific model predictions.
- Another participant states that the SM does not provide a specific prediction but suggests it is lighter than 200 GeV based on electroweak precision fits and heavier than 114 GeV based on LEP searches.
- The MSSM is mentioned to have a lower limit around 97 GeV and an upper limit of about 130 GeV, with some edge scenarios potentially allowing for lighter masses.
- The nMSSM is noted to have an upper limit of about 140 GeV, but no lower limit is provided.
- One participant claims that the little Higgs model is increasingly ruled out, with allowed scenarios becoming more unconventional.
- Split supersymmetry is mentioned with skepticism regarding its relevance.
- A participant questions the processes that lead to the unitarity bound on the upper limit in the nMSSM.
- Another participant clarifies that the bound is derived from the mass matrix rather than unitarity, discussing the relationship between eigenvalues and diagonal entries.
- Further clarification is provided regarding the upper bound in the nMSSM, linking it to the MSSM and an additional term from singlet coupling to the Higgs.
- A paper is referenced that may provide additional insights into the topic, particularly regarding the upper bound on lambda.
Areas of Agreement / Disagreement
Participants express varying predictions for the Higgs mass across different models, indicating a lack of consensus. Some models have clearer bounds than others, and there is debate about the relevance and implications of certain models.
Contextual Notes
The discussion includes limitations such as the dependence on specific theoretical assumptions and the lack of consensus on certain predictions. Some participants reference papers and external sources for further exploration of the topic.