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

Weighty questions

In an unprecedented feat of computation, particle theorists made the most precise prediction yet of the mass of the ‘charm–bottom’ particle. Days later, experimentalists dramatically confirmed that prediction.

This is a preview of subscription content, access via your institution

Access options

Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.

Figure 1: Gregarious quarks.
Figure 2: Perfect harmony.


  1. Allison, I. et al. Phys. Rev. Lett. 94, 172001 (2005).

    ADS  Article  Google Scholar 

  2. Acosta, D. et al. Phys. Rev. Lett. (submitted); preprint at

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

    ADS  CAS  Article  Google Scholar 

  4. Shipsey, I. et al. Nature 427 591–592 (2004).

    ADS  CAS  Article  Google Scholar 

  5. Aubin, C. et al. Phys. Rev. Lett. (submitted); preprint at (2005).

  6. Bonvicini, G. et al. 22nd Symp. Lepton–Photon Interactions at High Energy, Uppsala 1–5 July 2005 (submitted).

    Google Scholar 

  7. Shanahan, H. P. et al. Phys. Lett. B 453, 289–294 (1999).

    ADS  CAS  Article  Google Scholar 

Download references

Author information

Authors and Affiliations


Rights and permissions

Reprints and Permissions

About this article

Cite this article

Shipsey, I. Weighty questions. Nature 436, 186–187 (2005).

Download citation

  • Published:

  • Issue Date:

  • DOI:

This article is cited by


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