The new top-quark mass measurement is the single most precise result as yet. The mass of the top quark, the heaviest known elementary particle to-date, is one of the fundamental parameters of the Standard Model. Although the top quark mass is…

CMS has improved the constraints on the Higgs width, a fundamental property of this unique new particle, by more than two orders of magnitude. Nearly two years after its discovery, there is much to learn about the Higgs boson observed by the CMS and…

In the past two weeks we had the final round of approvals for Moriond EW that is taking place during the week of Mar 17-22. The results approved are: EXO-12-030: a search for pair-production of third generation scalar leptoquarks decaying to top…

The top quark remains, nearly 20 years after its discovery by the experiments at Fermilab’s Tevatron, the heaviest particle known. Its production and decays continue to be the subjects of extensive studies, both at the Tevatron and at the LHC. While…

At a seminar held at CERN this morning, the CMS collaboration presented several measurements of the properties of the Higgs boson discovered in July 2012. CMS showed for the first time strong evidence for the decay of Higgs bosons into fermions,…

CMS presented new results of searches for signatures of supersymmetry (SUSY) at the LHCP conference held in Barcelona, Spain in May and at the EPSHEP conference held in Stockholm, Sweden in July. These results use either the full 20 fb–1 of data…

CMS Experiment, CERN 25 July 2013 UPDATE: Last Friday, CMS and LHCb reported their individual results for the decay of Bs mesons into pairs of muons (see CMS results below). Yesterday, both collaborations jointly presented a preliminary combination…

One of the biggest unanswered questions of particle physics is why the mass of the Higgs boson is relatively small when the Standard Model suggests a more natural value would be many thousands of trillions of times higher. We don't know the answer…

Observing a phenomenon for the first time helps us fine-tune our understanding of the Universe. CMS physicists found such a phenomenon in September 2012 in proton-lead collisions, an observation that has since been reinforced by much more data from…

CMS measures production rates up to high transverse momenta A decade after its unexpected discovery, the properties of the X(3872) exotic resonance are still under intense scrutiny. This state was first seen in 2003 by the Belle experiment and then…

Sometimes, everyday words are co-opted by scientists and used as technical terms. One of these is the word “berry”. Talking to a botanist friend of mine, I learned that tomatoes are berries, but strawberries are not — the scientific meaning of a…

Following the results presented at the electroweak session of the annual winter conference, Rencontres de Moriond, CMS has now presented many new results for this week’s quantum chromodynamics (QCD) session. The results include many searches for new…