Search for third-generation scalar leptoquarks in pp at square root s=1.96 TeV.

Area of Science:

• Particle Physics
• High-Energy Physics
• Collider Physics

Background:

• Searches for new fundamental particles are crucial for understanding the universe.
• Leptoquarks are hypothetical particles that could bridge the gap between leptons and quarks.
• Third-generation leptoquarks, decaying to tau neutrinos and b quarks, are of particular interest.

Purpose of the Study:

• To search for evidence of pair-produced charge-1/3 third-generation leptoquarks.
• To establish upper limits on the production cross-section times branching fraction squared for these leptoquarks.
• To constrain the mass of third-generation leptoquarks based on experimental data.

Main Methods:

• Analysis of proton-proton collision data collected at the D0 detector at Fermilab.
• Utilizing a center-of-mass energy of 1.96 TeV.
• Setting upper limits on the leptoquark pair production cross-section as a function of leptoquark mass.

Main Results:

• Upper limits were placed on the production cross-section times branching fraction squared, sigma(pp --> LQLQ)B^2.
• Assuming a branching fraction B=1, third-generation scalar leptoquarks with a mass M(LQ) < 229 GeV were excluded.
• No evidence for leptoquark production was observed at the analyzed collision energies.

Conclusions:

• The study provides constraints on the existence of third-generation leptoquarks.
• The search contributes to the ongoing effort to discover new physics beyond the Standard Model.
• Future searches at higher energies and luminosities may probe larger leptoquark mass ranges.