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Repairs needed to be performed on a region consisting of 75 channels in the positive ECAL endcap, which had been inoperable since 2009.

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Early in the morning on 22 October, I grabbed my laptop and safety helmet and took the elevator 30 storeys underground to the CMS experimental cavern.

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CMS is taking its first steps in making up to half of its data accessible to the public, in accordance with its policy for data preservation, re-use and open access.

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Special mention to ATLAS and CMS experiments for confirming existence of the BEH mechanism by discovering a Higgs boson

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One otherwise unremarkable day, the meeting of the CMS group at the University of Minnesota Physics Department took an unexpected, yet not entirely uncommon, detour to the pages of the web.

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Guido Tonelli, CMS Spokesperson during 2010–2011, was awarded the prestigious Enrico Fermi Prize of the Italian Physics Society, along with other LHC scientists from Italy.

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Collide @ CERN and Swiss choreographer Gilles Jobin are working in collaboration with the CMS experiment at CERN, which

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Being a young researcher in a collaboration the size of CMS can be daunting, and requiring to move to CERN even more so. A new scholarship has been set up with the aim of supporting master's students, PhD researchers or post-docs of the CMS Collaboration for a year's stay at CERN.

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Mihir Khanna, from the Dhirubhai Ambani International School in Mumbai, India, was one of hundreds of high-school interns who come to CERN each year. He recounts his once-in-a-lifetime experience below.

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CMS presented new results of searches for signatures of supersymmetry (SUSY) at the LHCP conference held in Barcelona, Spain in May and at the EPSHEP conference held in Stockholm, Sweden in July.

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Despite the violent nature of the particle collisions that take place inside the CMS detector, the cathedral-sized cavern in which it sits thirty storeys underground exudes a certain peaceful calm.

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CMS has seen an important rare decay predicted by the Standard Model

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The CMS Guitar has already visited Point 5 in the past but this was her first time underground, with the detector itself.

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CMS is in many ways a living entity, undergoing change from time to time, with components being replaced or upgraded as their ability to handle the LHC's collisions reduces.

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One of the biggest unanswered questions of particle physics is why the mass of the Higgs boson is relatively small when the Standard Model suggests a more natural value would be many

Over recent weeks, members of the TE-VSC group have been removing seven components of the beam pipe located at the heart of the CMS detector. The delicate operations involved have been performed in several stages as the detector opening work has progressed.

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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.

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The EPS High Energy Physics Division announces the winners of its 2013 prizes, which will be awarded at the Europhysics Conference on High-Energy Physics (EPS-HEP 2013), Stockholm (Sweden) 18-24 July 2013 (http://eps-hep2013.eu/):

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CMS measures production rates up to high transverse momenta

The members of the CMS group at the University of Maryland were impressed when they learned of Sascha Mehlhase’s LEGO model of the ATLAS detector. They were also jealous, and so a group led by Jeff Temple, Marguerite Tonjes, and Jaime Gomez decided to build a matching LEGO model of CMS.

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

The Special Milner Fundamental Physics Prize is being awarded this week in recognition of the success of the international LHC Project, including the major contributions of the entire CMS collaboration, for the discovery of a Higgs boson as announced in July.

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

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New CMS Results at Moriond 2013

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

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In the early hours of 14 February 2013, the first period of running for the Large Hadron Collider came to an end. After three very fruitful years of collisions at the LHC, the blank screens of LHC Page 1 seem very odd.

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LHC access required: Time estimate ~ 2 years

On Saturday at 8.25am the shift crew in the CERN Control Centre extracted the beams from the Large Hadron Collider (LHC), bringing the machine’s first three-year running period to a successful conclusion. The following message marked the event on LHC Page 1: "No beam for a while.

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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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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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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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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.