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CMS News Archive

Correlation phenomena observed by CMS may shed light on exotic state of matter

2013-05-31, by Julia Velkovska

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 such collisions collected in early 2013.

Image 1: Event display for a high-multiplicity pPb collision at 5.02 TeV with about 420 tracks produced, recorded by CMS in 2013.

The X(3872) exotic charmonium: a charming puzzle

2013-05-02, by Alessandra Fanfani

CMS measures production rates up to high transverse momenta

Figure 1: An illustration of proposed interpretations for how quarks fit together to form the X(3872) state.

What do we mean by "cross section" in particle physics?

2013-03-18, by Jim Pivarski

Sometimes, everyday words are co-opted by scientists and used as technical terms. One of these is the word “berry”.

The Higgs boson production cross section for collisions of protons at a centre-of-mass energy of 8 TeV.

New CMS results at Moriond (QCD) 2013

2013-03-15, by Achintya Rao

New results on the Higgs boson, Standard Model physics, and searches for exotic physics

HIG-13-001 Event 1: Event recorded with the CMS detector in 2012 at a proton-proton centre-of-mass energy of 8 TeV. The event shows characteristics expected from the decay of the SM Higgs boson to a pair of photons (dashed yellow lines and green towers). The event could also be due to known Standard Model background processes.

New CMS results at Moriond (Electroweak) 2013

2013-03-05, by Achintya Rao

New results on the Higgs-like boson, Supersymmetry, and searches for exotic physics

HIG-13-002 Event 1: Event recorded with the CMS detector in 2012 at a proton-proton centre-of-mass energy of 8 TeV. The event shows characteristics expected from the decay of the SM Higgs boson to a pair of Z bosons, one of which subsequently decays to a pair of electrons (green lines and green towers) and the other Z decays to a pair of muons (red lines). The event could also be due to known Standard Model background processes.

Colliding different particle species: the LHC's proton-lead run

2013-01-18, by Achintya Rao

The new year brings a new type of collision at the LHC: the accelerator will smash protons and lead nuclei together, allowing CMS and the other LHC experiments to study the cold nuclear matter we expect these collisions to produce.

A proton-lead collision at a centre-of-mass energy of 5 TeV per nucleon. In this side-on view, the proton beam enters from the right side of the image and leaves on the left; the lead beam travels in the opposite direction. The event was selected requiring a muon trigger, and the muon (red line) was reconstructed in the CSC detectors.

CMS observes melting of Upsilon particles in heavy-ion collisions

2012-12-18, by Achintya Rao

In 2011, CMS presented early evidence that Upsilon (Υ) particles produced in lead-lead collisions “melt” as a consequence of interacting with the hot nuclear matter created in these heavy-ion interactions

Candidate Υ decay to two muons observed in a lead-lead collision at the LHC. The two red lines (tracks) are the two muons, the mass of orange lines are tracks from other particles produced in the collision, whose energy is measured in the electromagnetic calorimeter (red cuboids) and the hadron calorimeter (blue cuboids).

CMS observes unexplained particle states

2012-12-10, by Achintya Rao

 

J/&psi;-&phi; mass spectrum in a sample of B<sup>+</sup>&nbsp;&rarr;&nbsp;J/&psi;&phi;K decays. The two prominent structures are shown in red compared the expected background shown in blue.

Highlights of CMS results presented at HCP

2012-11-22, by Achintya Rao

Kyoto, Japan on 12–16 November 2012

A candidate event for a Higgs boson decaying into two photons

Precision measurements using top quarks at CMS

2012-10-30, by Pedro Vieira De...

Amongst all known elementary particles, the top quark is peculiar: weighing as much as a Tungsten atom, it completes the so-called 3rd generation of quarks and is the only quark whose properties can be directly measured.

Figure 1: Summary of all the measurements of the top-quark mass performed at CMS and result of the combination.

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