Constraints on Non-Standard Contributions to the Charged-Current Interactions

Abstract

The success of the quantum level predictions of the Standard Model on the $Z$ boson properties, on $\mw$ and on $\mt$, which makes use of the muon lifetime as an input, implies a stringent constraint on new physics contributions to the $V-A$ charged-current interactions among leptons. Observed unitarity of the CKM matrix elements then implies constraints on non-standard contributions to the lepton-quark charged-current interactions. By using the recent electroweak data as inputs, we find the 95%~CL limits for the corresponding contact interactions: ${\Lambda }_{CC,+}^{\ell \ell }>7.5$ TeV and ${\Lambda }_{CC,-}^{\ell \ell }>10.2$ TeV for the purely leptonic terms, and ${\Lambda }_{CC,+}^{\ell q}>5.8$ TeV and ${\Lambda }_{CC,-}^{\ell q}>10.1$~TeV for the lepton-quark contact interactions.

11 pages, Latex, 1 figure, added a few references

References in corpus (6)

• Comparison of ZEUS Data with Standard Model Predictions for e^+ p -> e^+ X Scattering at High x and Q^2
• Observation of Events at Very High Q^2 in ep Collisions at HERA
• Comments on the high-$Q^2$ HERA anomaly
• Contact Interactions and high-Q2 events in e^+ p collisions at HERA
• Contact terms in charged current processes at HERA
• Comment on $Z^{\prime }$'s and the H1 and ZEUS High $Q^2$ Anomalies

Cited by in corpus (3)

• R-parity violating supersymmetry
• Constraints on Electron-quark Contact Interactions and Implications to models of leptoquarks and Extra Z Bosons
• Four Fermion Contact Terms in Charged Current Processes and Large Extra Dimensions