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First collisions of pPb run with stable beams

A jubilant CMS Control Room, shortly after the LHC provided the first pPb collisions with stable beams.

The LHC has just delivered the first pPb (proton-lead) collisions with stable beams of 2013 and CMS is happily running with all sub-detectors on. We are also having common triggers with TOTEM and everything is behaving very well.

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

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.

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.

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Announcement of CMS Alumni LinkedIn Group

Dear CMS members,

The CMS CB career committee hopes you all had a restful vacation and will have a great new year!

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CMS observes melting of Upsilon particles in heavy-ion collisions

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).

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

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CMS observes unexplained particle states

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.

In the vast particle landscape, there are, to borrow a phrase, known knowns (the Standard Model, for example), unknown unknowns (exotic extensions of the Standard Model and beyond), and those ever-interesting known unknowns. A recent CMS observation perfectly fits into this third category.

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CMSDASia: First CMS Data Analysis School held in Asia

Students presenting their physics results at CMSDASia

Collaborations of high-energy physicists often number in the thousands, and this presents some unique challenges. “CMS is a big collaboration, with 3,000 people from diverse backgrounds, speaking different languages,” says Sudhir Malik, co-convener of the CMS Data Analysis School (CMSDAS).

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Highlights of CMS results presented at HCP

A candidate event for a Higgs boson decaying into two photons

Kyoto, Japan on 12–16 November 2012

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New CMS Career Committee

Dear Colleagues,

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CMS prepares for Pixel and HCAL upgrades

Transverse-oblique view comparing the pixel barrel layers in the existing detector (left half) and the upgraded version (right).

After three years of very successful operation that led to the discovery of a new boson in 2012, the LHC is scheduled for a series of upgrades that will enhance the experimental potential to study the nature of the new particle, and to extend the searches for new physics beyond the Standard Model

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Precision measurements using top quarks at CMS

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

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.

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