Search for dijet resonances in 7 TeV pp collisions at CMS

Area of Science:

• High Energy Physics
• Particle Physics
• Collider Physics

Background:

• The Standard Model of particle physics describes fundamental particles and forces.
• Searches for physics beyond the Standard Model are crucial for understanding fundamental interactions.
• Dijet resonances are a key signature for new heavy particles predicted by various theories.

Purpose of the Study:

• To search for narrow resonances in the dijet mass spectrum.
• To set exclusion limits on new particles predicted by theories beyond the Standard Model.
• To extend existing exclusion limits on hypothetical particles.

Main Methods:

• Utilized data from the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC).
• Collected data corresponding to an integrated luminosity of 2.9 inverse picobarns (pb⁻¹).
• Performed a search for narrow resonances in the dijet invariant mass spectrum.

Main Results:

• Presented upper limits at the 95% confidence level on resonance cross sections and branching fractions into dijets.
• Excluded new particles predicted by specific models within certain mass ranges.
• Excluded string resonances with mass < 2.50 TeV.
• Excluded excited quarks with mass < 1.58 TeV.
• Excluded axigluons, colorons, and E6 diquarks in specific mass intervals.

Conclusions:

• The search found no evidence for new narrow resonances in the dijet mass spectrum.
• The results place stringent constraints on theories predicting new heavy particles.
• Published limits on various beyond-Standard-Model scenarios have been extended.