Constraints on the Universal Contact Interaction

Abstract

Forces beyond those of the standard model may manifest themselves at low energies as four-fermion contact interactions. If these new forces are independent of colour and flavour quantum numbers including baryon and lepton number, then all low energy constraints, arising from quark-lepton universality, flavour-changing neutral currents and atomic parity violation are evaded. This is due to the global U(45) symmetry which the standard model exhibits in the limit of vanishing gauge and Yukawa couplings. The corresponding contact interaction is a unique current-current interaction. Constraints from LEP2 imply that this universal contact interaction cannot be the origin of the recently observed high-$Q^2$ events at HERA.

6 pages Latex, no figures

Cited by in corpus (14)

• HERA Collider Physics
• Constraints on two-lepton, two quark operators
• Global Constraints on Lepton-Quark Contact Interactions
• Measurement of the High-Mass Drell-Yan Cross Section and Limits on Quark-Electron Compositeness Scales
• Global Study of Electron-Quark Contact Interactions
• What if Charged Current Events at Large Q2 are Observed at HERA ?
• Universal Torsion-Induced Interaction from Large Extra Dimensions
• Torsion Constraints in the Randall--Sundrum Scenario
• Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC
• Search for Excited Quarks in $q\bar{q}\to \gamma \gamma$ at the LHC
• NLO Corrections to lepton pair production beyond the Standard Model at hadron colliders
• Contact Interactions Involving Right-handed Neutrinos and SN1987A
• Supersymmetric interpretation of high--$Q^2$ HERA events and other related issues
• Impact on SUSY-Breaking Models of the $R$-Parity Violating Squark Interpretation of the HERA Anomaly