Synopsis: More tau leptons than expected

An excess of tau leptons in bottom meson decays signals a puzzling departure from the standard model.
Synopsis figure
SLAC National Accelerator Laboratory

As reported in Physical Review Letters, the BaBar collaboration at SLAC has analyzed a large data set and found an excess of events containing tau leptons in the decay of bottom mesons that doesn’t agree with the predictions of the standard model of particle physics.

BaBar looked for the decays of bottom mesons (a bound state of a bottom quark and a light quark) into a charm meson, a charged lepton, and a neutrino. Compared to a previous analysis, they were able to increase the efficiency with which they identified signal events by more than a factor of 3. BaBar determined the ratio of those decays that contained tau leptons to those that contained light charged leptons (electrons or muons), obtaining a larger ratio than predicted by the standard model by 3.4 standard deviations.

This deviation could be due to some new particle, such as a charged Higgs boson, which couples more strongly to heavy particles like taus than to electrons or muons (though BaBar shows that one of the most commonly studied models with a charged Higgs boson does not work). Systematic errors or statistical fluctuations could also give rise to the apparent excess of tau leptons. Finally, it could be that the standard model theoretical prediction BaBar compares their data to will change. In a recent paper (Jon A. Bailey et al., Phys. Rev. Lett. 109 071802 (2012)) researchers recalculated one of the theoretical inputs into that prediction, and their results reduce the discrepancy BaBar finds to 3.2 standard deviations. – Robert Garisto


Features

More Features »

Announcements

More Announcements »

Subject Areas

Particles and Fields

Previous Synopsis

Nonlinear Dynamics

Alphabet Waves

Read More »

Next Synopsis

Related Articles

Synopsis: How Dark Matter Shaped the First Galaxies
Astrophysics

Synopsis: How Dark Matter Shaped the First Galaxies

Simulations show that competing models of dark matter produce primordial star-forming regions that look very different from one another. Read More »

Synopsis: A New Plasma-Based Axion Detector
Particles and Fields

Synopsis: A New Plasma-Based Axion Detector

A proposed device could detect the hypothesized dark matter particle in a mass regime not probed by other devices. Read More »

Focus: “Quantum Foam” Scrubs Away Gigantic Cosmic Energy
Particles and Fields

Focus: “Quantum Foam” Scrubs Away Gigantic Cosmic Energy

Theory suggests that empty space is filled with enormous energy, but according to a new proposal, this energy may be hidden because its effects cancel at the tiniest scales. Read More »

More Articles