Originally posted on the September EP Newsletter The CMS detector still looks familiar, but empty racks and cable trays reveal that its Phase-2 transformation has begun. Removing around 600 m³ of legacy services safely, traceably and without interrup…

The core of the CMS experiment, the tracker pixel detector, has been removed after a decade of successful operation.  Acting as the detector’s innermost tracker, it recorded signals left by charged particles, enabling scientists to reconstruct t…

CMS observes the η meson decaying into two muons and two charged pions for the first time. Over the past three years, the CMS experiment has steadily expanded our view of the eta (η) meson's rarest decays. Following the first observations of the η me…