ATLAS: Last detector connected

The LUCID detector, which will measure the luminosity of the collisions occurring in the centre of ATLAS, was among the last pieces of the detector to get approval. In fact, the small collaboration, based in Bologna, Italy; Alberta, Canada; Lund, Sweden; and at CERN, didn’t even begin building until February of last year. LUCID is …

Accumulating evidence for nonstandard leptonic decays of Ds mesons

from arXiv:0803.0512v2 [hep-ph] The measured rate for D_s -> l nu decays, where l is a muon or tau, is larger than the standard model prediction, which relies on lattice QCD, at the 3.8 sigma level. We discuss how robust the theoretical prediction is, and we show that the discrepancy with experiment may be explained …