Smile!

Here's how we feel about all the beautiful collision data ATLAS has taken over the last few weeks.

(This is an "Armenteros Plot" of -p_T⁺ vs (p_L⁺ - p_L^-) / (p_L⁺ + p_L^-) (where p_T and p_L are the momenta (of the positive/negative daughter), respectively transverse and longitudinal to the decaying particle's direction), and shows the decays of K⁰_s (in the smile) and Λs (right eye) and anti-Λs (left eye). It was included in today's ATLAS Report on first collision data, though in a less cheerful form.)