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A bound on the natural width of the Higgs boson

Figure 1: The observed mass distribution of two Z bosons in four leptons events. The points are the data, while the blue histogram is the distribution expected from direct ZZ production in the Standard Model. The red line with a central value around 125 GeV is the Higgs boson signal.

CMS has improved the constraints on the Higgs width, a fundamental property of this unique new particle, by more than two orders of magnitude.

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How "green" are we? The environmental footprint of an LHC detector

Power consumption for the LHC and its detectors

At the time when the minds of a few physicists are occupied with the design of a new detector, and the first meetings take place around a coffee table with detector engineers, the subjects discussed the most are the intensity and homogeneity of the magnetic field, the hermetic nature of the calor

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CMS Internal Newsletter, March 21, 2014

CMS news from the past two weeks:

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Upgrading the CMS Control Room

The CMS control room is the heart of CMS operations, located at LHC point 5 in Cessy, France.

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Physics News (Mar 21, 2014)

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:

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En route to 2015: Alignment and Calibration Workshop

A workshop on Alignment and Calibration (AlCa), organized by the PPD and DPG Coordinations, was held at CERN from the 17th to the 19th of March (https://indico.cern.ch/event/306000/).

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YB-1 wheel closed; course now set towards physics re-start

The last few months have seen several important objectives of the CMS LS1 programme completed, giving increasing confidence in the final outcome.

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A cool Tracker! Cold operation established for subdetector

Image 1: Tracker bulkhead in closed state with insulation pieces installed during an early trial in fall 2013

The Tracker is a subdetector that is located closest to the collision point of the LHC’s particle beams inside the CMS detector. It must face an onslaught of billions of particles flying through it each second of operation.

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Stable Cold Tracker Operation Established (aka: the Tracker is Cool!)

Image 1: Tracker bulkhead in closed state with insulation pieces installed during an early trial in fall 2013

After two years of planning, one year of implementation, and two million CHF worth of investments, the Tracker project has achieved its most important goal to enable the “Tracker Going Cold”.

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CB Newsletter: February 2014

From the desk of the CB Chairperson
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