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Related Experiment Videos

B0-B(-)0 mixing beyond factorization in QCD sum rules.

J G Körner1, A I Onishchenko, A A Petrov

  • 1Institut für Physik, Johannes-Gutenberg-Universität, Staudinger Weg 7, D-55099 Mainz, Germany.

Physical Review Letters
|November 13, 2003
PubMed
Summary

We calculated the B0-B(-)0 mixing matrix element using QCD sum rules. Our findings reveal radiative corrections violate factorization at next-to-leading order (NLO), impacting B parameter calculations.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics (QCD)
  • Particle Physics

Background:

  • B0-B(-)0 mixing is a key phenomenon in particle physics.
  • Accurate calculations are needed to interpret experimental data.
  • Previous calculations lacked next-to-leading order (NLO) accuracy.

Purpose of the Study:

  • To calculate the B0-B(-)0 mixing matrix element with NLO accuracy.
  • To investigate the impact of alpha(s) corrections on this calculation.
  • To provide a more precise input for experimental measurements.

Main Methods:

  • Utilizing QCD sum rules for three-point functions.
  • Computing alpha(s) corrections to the three-point function at the three-loop level.
  • Applying QCD perturbation theory for next-to-leading order (NLO) analysis.

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Main Results:

  • Achieved NLO accuracy for the B0-B(-)0 mixing matrix element.
  • Quantified a 10% violation of factorization due to radiative corrections at NLO.
  • Determined the B parameter as B(B)(m(b))=1+0.1(PT)-0.05(non-PT).

Conclusions:

  • The NLO calculation provides a consistent evaluation of B0-B(-)0 mixing.
  • Factorization violation is under control and quantified.
  • The results improve the precision of theoretical predictions for B meson mixing.