Search for large extra spatial dimensions in dimuon production with the d0 detector

Area of Science:

• High Energy Physics
• Particle Physics
• Cosmology

Background:

• The Standard Model of particle physics does not account for gravity.
• Theories with large extra spatial dimensions propose solutions to the hierarchy problem by introducing additional dimensions beyond the usual three spatial ones.
• Experimental searches are crucial to test these theoretical extensions of the Standard Model.

Purpose of the Study:

• To search for indirect evidence of large extra spatial dimensions.
• To probe new physics beyond the Standard Model at the TeV scale.
• To set limits on the fundamental Planck scale in theories with extra dimensions.

Main Methods:

• Analysis of proton-antiproton collision data collected at the Fermilab Tevatron Collider.
• Selection of events containing a pair of energetic muons (dimuon events).
• Comparison of observed event yields with Standard Model background predictions.

Main Results:

• Observed data showed good agreement with expected Standard Model backgrounds.
• No significant excess of events attributable to large extra spatial dimensions was found.
• The analysis set 95% confidence level (C.L.) lower limits on the fundamental Planck scale, ranging from 0.85 to 1.27 TeV depending on the theoretical model.

Conclusions:

• The results provide no evidence for the existence of large extra spatial dimensions within the analyzed dataset.
• The study achieved the most stringent limits to date on the fundamental Planck scale in the dimuon channel.
• These findings constrain theories that predict observable effects of extra spatial dimensions at the TeV scale.