Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Particle physics

A win–win situation

The most precise calculations yet of how two quarks locked in a bound state annihilate have been achieved using lattice quantum chromodynamics — and signal a curious discrepancy.

Your institute does not have access to this article

Access options

Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.

Figure 1: CP violation and the unitary triangle.
Figure 2: Quantum chromodynamics and the B meson.


  1. Follana, E. et al. (HPQCD and UKQCD Collaborations) Phys. Rev. Lett. 100, 062002 (2008).

    ADS  Article  Google Scholar 

  2. Davies, C. T. H. et al. Phys. Rev. Lett. 92, 022001 (2004).

    ADS  Article  Google Scholar 

  3. Shipsey, I. Nature 435, 185–187 (2005).

    Google Scholar 

  4. Aubin, C. et al. (MILC Collaboration) Phys. Rev. D 70, 114501 (2004).

    ADS  Article  Google Scholar 

  5. Artuso, M. et al. (CLEO Collaboration) Phys. Rev. Lett. 95, 251801 (2005).

    ADS  Article  Google Scholar 

  6. Pedlar, T. K. et al. (CLEO Collaboration) Phys. Rev. D 76, 070002 (2007).

    Article  Google Scholar 

  7. Ecklund, K. M. et al. (CLEO Collaboration) Phys. Rev. Lett. (in the press); preprint at <> (2007).

  8. Dobrescu, B. A. & Kronfeld, A. S. Preprint at <> (2008).

Download references

Author information

Authors and Affiliations


Rights and permissions

Reprints and Permissions

About this article

Cite this article

Shipsey, I. A win–win situation. Nature Phys 4, 438–440 (2008).

Download citation

  • Issue Date:

  • DOI:


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing