On March 30th at 12.58 LHC delivered to CMS for the first time 7 TeV Ecm collisions. CMS and the Tracker were fully operational and collected about 210.000 Minimum Bias events in ~ 2 hours during the first fill. Everything worked very well, the…

  The CMS experiment achieves the most precise determination of the strength of the strong nuclear force using the rates of production of jets at several centre-of-mass energies. The strengths of the fundamental interactions in Nature drive the…

  For the first time, the CMS experiment has employed physics-informed machine learning to observe whether the laws of physics still hold true when top quarks and Z bosons are replaced with their antiparticles and space is reflected. We know…

  The CMS experiment presents the first-ever search for a Higgs boson decaying to charm quarks when the Higgs boson is produced along with two top quarks. The Higgs boson plays a central role in our understanding of the fundamental forces of…

  By studying events with only a single energetic photon, the CMS experiment places some of the most stringent constraints to date on dark matter models and theories predicting extra dimensions of space. One way to explore physics beyond the…

On 14th December, just 3 weeks after its restart, the LHC collided 1.18TeV beams of protons in CMS for the first time. During this first period more than 15000 2.36 TeV collision events were accumulated by CMS. You can keep up with the excitement…

On 23rd November the LHC collided 450 GeV beams of protons for the first time (see here) but only for a short period as a trial. The first real period of collisions started on 6th December. The aim for the coming days is to accumulate about 100000…

Today LHC delivered to CMS a total of about 5 hours of clean collisions and we have recorded about 11000 min bias BSC triggers. The quality of the data produced and the performance of the Tracker together with the exceptional speed with which we…

This morning between 8:20 and 8:50 for the first time the full Tracker (Strips and Pixel) was turned ON and successfully collected data in Global run with a quiet single beam running in LHC. This is a major achievement. Everything seems all right…

Only TOB was turned ON today after LHC Opearation declared stable beams for a while. Below is a 900 GeV p-p collision event seen by the TOB in Run 122314, Evt 8605569.

TOB was turned ON today after LHC Opearation declared stable beams for a while. Here are images showings possible tracks from inelastic collisions detected by TOB in run 122294, lumi section 37

Following the "splash" events of 6th/7th November (see here) the time has come to circulate the proton beams all around the LHC. This started in the early evening (Geneva time) on friday 20th and by midnight the beam had been circulated in both…