Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 1, 2005 | Published
Journal Article Open

Weak mixing angle at low energies


We determine the weak mixing angle in the (MS) over bar scheme, sin(2)(theta) over cap (W)(mu), at energy scales mu relevant for present and future low-energy electroweak measurements. We relate the renormalization group evolution of sin(2)(theta) over cap (W)(mu) to the corresponding evolution of (alpha) over cap(mu) and include higher-order terms in alpha(s) and alpha that had not been treated in previous analyses. We also update the analysis of nonperturbative, hadronic contributions and argue that the associated uncertainty is small compared to anticipated experimental errors. The resulting value of the low-energy (MS) over bar weak mixing angle is sin(2)(theta) over cap (W)(0)=0.23867 +/- 0.00016.

Additional Information

© 2005 The American Physical Society. Received 21 October 2004; revised manuscript received 11 July 2005; published 13 October 2005. We are happy to thank Krishna Kumar, Paul Langacker, Philip Mannheim, Robert McKeown, Michael Pennington, Alberto Sirlin, and Peter Zerwas for very helpful discussions, and Peter Zerwas also for a careful reading of the manuscript. We are grateful for the support from the Institute for Nuclear Theory at the University of Washington, where this work was initiated. M. R.-M. thanks the Physics Institute at UNAM for support and hospitality during a visit to undertake this project. This work was supported in part by U.S. Department of Energy Contracts No. DE-FG02-00ER41146, No. DE-FG03-02ER41215, and No. DE-FG03-00ER41132, by the National Science Foundation Grant No. PHY00-71856, by CONACYT (México) Contract No. 42026-F, and by DGAPA-UNAM Contract No. PAPIIT IN112902.

Attached Files

Published - ERLprd05.pdf


Files (238.9 kB)
Name Size Download all
238.9 kB Preview Download

Additional details

August 22, 2023
October 13, 2023