Inclusive search for supersymmetry using razor variables in pp collisions at √s=7 TeV

Area of Science:

• High Energy Physics
• Particle Physics
• Collider Physics

Background:

• The Standard Model of particle physics describes known fundamental particles and forces.
• Supersymmetry (SUSY) is a theoretical extension proposing partner particles for each Standard Model particle.
• Searches for new physics beyond the Standard Model are crucial for understanding fundamental interactions.

Purpose of the Study:

• To conduct an inclusive search for new heavy particle pairs produced in proton-proton collisions.
• To probe the third-generation sector of supersymmetry using event heavy-flavor content.
• To set exclusion limits on supersymmetric models within the Complex Minimal Supersymmetric Standard Model (CMSSM) and simplified models.

Main Methods:

• Analysis of proton-proton collision data at a center-of-mass energy of 7 TeV.
• Utilized 4.7±0.1 fb(-1) of integrated luminosity from the Large Hadron Collider (LHC).
• Employed a 2D analysis in the razor variables M(R) and R, sensitive to missing transverse energy and heavy particle mass scales.

Main Results:

• No significant excess of events was observed beyond the Standard Model predictions.
• Exclusion limits were derived for various supersymmetric scenarios.
• Ruled out gluino masses up to 800 GeV and squark masses up to 1.35 TeV in the CMSSM framework at 95% confidence level.
• Excluded direct production of top or bottom squark pairs up to 400 GeV.

Conclusions:

• The search found no evidence for new heavy particles predicted by generic supersymmetry models.
• The results provide stringent constraints on supersymmetric parameter space, particularly for third-generation squarks.
• This study contributes to the ongoing quest for physics beyond the Standard Model at the LHC.