Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-10
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 9 figures, latex, Talk at XV Rencontres de Physique de la Vallee d'Aoste, March 2001. One reference added
Scientific paper
The effect of the recently observed 2.6 sigma deviation of the muon anomalous magnetic moment (a_mu = (g_mu -2)/2) from its Standard Model prediction is examined within the framework of supergravity models with grand unification and R parity invariance. The constraints of the Higgs mass bounds, the b -> s gamma bounds (including the large tan beta NLO corrections) and the cosmological relic density of light neutralinos (including all slepton neutralino coannihilation effects) are included in the analysis. For universal soft breaking, the Higgs and b -> s gamma bounds puts a lower bound m_1/2 >~ 300 GeV, most of the parameter space now falling in the co-annihilation region. The 2 sigma lower bound on the magnetic moment anomaly places an upper bound of m_1/2 ~< 800 GeV. It is seen that mSUGRA requires that a_mu ~< 50 \times 10^{-10}. One finds for m_h > 114 GeV, that tan beta > 5(7) for A_0 = 0(-4 m_1/2) and for m_h > 120 GeV, one has tan beta > 15 (10) for A_0 = 0(-4m_1/2). The sparticle spectrum is now much constrained, and the reaches of the Tevatron RUN II, NLC, and LHC for new physics discovery are discussed. Dark matter detection rates are examined, and it is seen that future detectors now would be able to scan most of the parameter space. Models with non-universal soft breaking in the Higgs and third generation of squarks and sleptons are exmained, and it is seen that a new Z s-channel annihilation of neutralinos in the early universe is possible with dark matter detection rates accessible to the next round of detectors.
Arnowitt Richard
Dutta Bhaskar
Hu Beilai
Santoso Yudi
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