Search for heavy particles decaying into electron-positron pairs in pp collisions

Area of Science:

• High Energy Physics
• Particle Physics
• Collider Physics

Background:

• Searches for new heavy neutral gauge bosons (Z') and heavy vector mesons (technirho, techniomega) are crucial for extending the Standard Model.
• Previous searches have constrained the masses of such hypothetical particles.

Purpose of the Study:

• To search for technirho (rho(T)), techniomega (omega(T)), and Z' particles decaying into electron-positron pairs.
• To set upper limits on the production cross-sections for these particles as a function of their mass.

Main Methods:

• Analysis of 124.8 pb(-1) of proton-antiproton collision data collected by the D0 detector at the Fermilab Tevatron.
• Utilizing the e(+)e(-) decay channels for particle identification and mass reconstruction.

Main Results:

• No significant signal for rho(T), omega(T), or Z' particles was observed.
• 95% Confidence Level (C.L.) upper limits were placed on the production cross-sections.
• The existence of degenerate rho(T) and omega(T) states with masses below approximately 200 GeV was excluded for certain model parameters.
• A Z' boson with a mass below 670 GeV was excluded, assuming Standard Model-like couplings.

Conclusions:

• The study provides stringent constraints on the masses of hypothetical technicolor particles and Z' bosons.
• The results contribute to the ongoing search for physics beyond the Standard Model at high-energy colliders.