Abstract

We present a new extraction of the effective strong coupling constant αs,g1(Q2). The result agrees with a previous determination and extends the measurement of the low and high Q2 behavior of αs,g1(Q2) that was previously deduced from sum rules. In particular, it experimentally verifies the lack of Q2-dependence of αs,g1(Q2) in the low Q2 limit. This fact is necessary for application of the AdS/CFT correspondence to QCD calculations. We provide a parameterization of αs,g1(Q2) that can equivalently be used to parameterize the Q2-dependence of the generalized Gerasimov–Drell–Hearn and Bjorken sums.

Highlights

  • In Quantum Chromodynamics (QCD), the gauge theory of the strong force, the magnitude of the coupling is given by the running coupling constant αs

  • The result agrees with a previous determination and extends the measurement of the low and high Q2 behavior of αs,g1(Q2) that was previously deduced from sum rules

  • While αs is well defined within perturbative QCD at large Q2 [1], these calculations lead to an infinite coupling at large distances

Read more

Summary

Introduction

In Quantum Chromodynamics (QCD), the gauge theory of the strong force, the magnitude of the coupling is given by the running coupling constant αs. We present a new extraction of the effective strong coupling constant αs,g1(Q2). An effective strong coupling constant, αs,g1, has been extracted [5] from experimental data on the Bjorken sum [6].

Results
Conclusion

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.