Editor’s note: Starting this year, Fermilab Today will bring you more results from research at the Energy, Intensity and Cosmic Frontiers. We will publish these results on Thursdays and Fridays, highlighting the full breadth of Fermilab’s experiments. In the Standard Model, the top quark almost always decays to a W boson and a b quark as shown in this diagram. The specifics of the tWb interaction at the decay vertex affect the kinematics of the W boson and b quark….
The red line shows the fit to the Bs0 –> J/ψ f0 decay mode. The blue dashed line shows the fit to the background. The Bs0 meson is a particle with the peculiar property that it can transform itself into its antiparticle. This process is described by the Standard Model of particle physics, and it was first observed by the CDF collaboration back in 2006. Now, with much larger data samples than originally used, physicists at the Tevatron are searching…
The figure shows limits on the Bs decay rates at the Tevatron. CDF found at a 90 percent confidence level the rate is between 0.46 and 3.9 x 10-8. The central value is more than five times than predicted by the Standard Model. These physicists were responsible for this analysis. Top row, from left: Satoru Uozumi and Daejung Kong, Kyungpook National University, Korea; Teruki Kamon, Texas A&M/KNU; Matthew Herndon and David Sperka, Wisconsin University. Bottom row, from left: Walter Hopkins…
The transverse mass distribution of electron + missing transverse energy for data and standard model expectation. The red region shows our expectations for a W-prime of mass equal to 800 GeV/c2. In the Standard Model the quarks and leptons communicate with each via the exchange of particles known as bosons. The bosons of the Standard Model are the photon, the gluon and the W and Z particles. It is natural to wonder if there are additional bosons present in nature;…