ATLAS Cavern - Dec 2014

Review Before Run 2

1st June 2015 – ATLAS is ready for Run 2 of the Large Hadron Collider (LHC) where proton beams will be collided together at a higher centre of mass collision energy of 13 TeV, and reach higher luminosities than ever before.

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From ATLAS Around the World: The oldest observer state of CERN is no longer just observing!

26th May 2015If you have ever been to a bazaar in Turkey, you would know that you have to bargain hard and you have to carefully examine what you buy. Sometimes this attitude goes way too far. In our case about half a century… Turkey had been an observer state of CERN since 1961 but as of 6 May 2015.  

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ATLAS Records First Test Collisions at 13 TeV

22nd May 2015 – On 20 May at around 22:24, ATLAS recorded the first 13 TeV test collisions delivered by the Large Hadron Collider. The proton collisions set a new high energy record, marking the beginning of ATLAS' journey into unexplored physics frontiers as we prepare for production data-taking, scheduled to start in early June.

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The humble telescope I used at high school pointed me both to the past and to the future

From ATLAS Around the World: First Blog From Hong Kong

19th May 2015Guess who ATLAS’s youngest member is? It’s Hong Kong! We will be celebrating our first birthday in June, 2015. The Hong Kong ATLAS team comprises members from The Chinese University of Hong Kong (CUHK), The University of Hong Kong (HKU) and The Hong Kong University of Science and Technology (HKUST), under the the Joint Consortium for Fundamental Physics.

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Coordination for Collisions

14th May 2015 – There is the Large Hadron Collider and then there are its experiments. When the collider is ready to circulate proton beams, the experiments have to be ready to receive them.

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First Collisions At Injection Energy

8th May 2015 – On the morning of 5 May 2015, ATLAS recorded the first scheduled proton beam collisions since the Large Hadron Collider and its experiments started up after two years of maintenance and repairs.

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From ATLAS Around the World: African Horizons

8th May 2015 – It’s great being back at CERN and being able to immerse myself in the tangible atmosphere of excited anticipation for the first collisions at 13 TeV this June. I am a South African, usually based in Durban — a city currently afflicted with xenophobically motivated riots and rolling blackouts. Being at CERN is really a different world right now, to a greater extent than usual.

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All the CoEPP workshop attendees outside MONA, Hobart.

From ATLAS Around the World: A view from Down Under

16th April 2015While ATLAS members at CERN were preparing for Run 2 during ATLAS week, and eagerly awaiting the beam to re-circulate the LHC, colleagues “down under” in Australia were having a meeting of their own. The ARC Centre of Excellence for Particle Physics at the Terascale (CoEPP) is the hub of all things ATLAS in Australia.

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Splashes for Synchronization

15th April 2015 – ATLAS uses "beam splash" events to provide simultaneous signals to large parts of the detector, and verify that the readout of different detectors elements are fully synchronized. After the first 2015 Large Hadron Collider beam circulation on Easter Sunday, a run dedicated to taking beam splash events was set up on Tuesday evening, 7 April.

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From ATLAS Around the World: Preparing for Run 2 from Colombia

9th April 2015After a two-year stay at CERN, I moved back to Colombia in 2012. Being involved in ATLAS and working from Colombia has been a great experience for me; I get to continue contributing to the physics searches and also do other things like teaching, giving seminars, and doing outreach activities.

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Shots from the Long Shutdown

8th April 2015 – As ATLAS gears up to record data from proton collisions delivered by the Large Hadron Collider (LHC) at an unprecedented energy level, here are glimpses from the last two years of preparations.

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A Week of Firsts

7th April 2015The annual conference, Moriond, is in its 50th edition this year, and I’ve had the pleasure of coming down to Aosta in Italy to participate in the QCD session; for the first time. It’s actually a week of firsts for me. The conference organizers described it as being in a kind of “QCD confinement”.

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Beam Splash in ATLAS

ATLAS is ready and waiting for collisions

6th April 2015 – The first long shutdown of the Large Hadron Collider has now ended, after two years of intense but careful activity refurbishing and improving many aspects of ATLAS, mirroring the work to prepare the LHC for collisions at the new energy of 13 TeV.

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New physics and Italian food

Moriond Electroweak: physics, skiing and Italian food

30th March 2015 – If you’re a young physicist working in high energy physics, you realize very soon in your career that “going for Moriond” and “going to Moriond” are two different things, and that neither of the two means that you’re actually going to Moriond. This year’s “Moriond Electroweak” was held in the Italian mountain resort of La Thuile, and had a special significance.

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The coupling of the Higgs boson to fermions and bosons as a function of the particle’s mass.

ATLAS further verifies Standard Model coupling/mass relationship of Higgs boson

27th March 2015The discovery of a Higgs Boson in 2012 by the ATLAS and CMS experiments marked a key milestone in the history of particle physics. It confirmed a long-standing prediction of the Standard Model, the theory that underlines our present understanding of elementary particles and their interactions.

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Angular observables sensitive to the spin and parity of a Higgs boson decay.

The scalar boson

26th March 2015The ATLAS experiment has released results confirming that the Higgs boson has spin 0 (it is a so-called “scalar”) and positive parity as predicted by the Standard Model, making it the only elementary scalar particle to be observed in nature.

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Candidate event in the search for a Higgs boson produced together with a top-antitop quark pair.

In search of rare Higgs boson production with top quarks

24th March 2015In proton-proton collisions, several processes can lead to the production of a Higgs boson. The most “frequent” process (which is about one collision in four billion!) is the fusion of two gluons, contained in the initial protons, into a Higgs boson through a “top-quark loop”. Least frequent is a mode where the Higgs boson is produced in association with a pair of top-quarks.

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Latest ATLAS Results on the Higgs Boson

19th March 2015 – On 17 March, ATLAS presented their latest Higgs physics results at an LHC seminar at CERN from data collected during the LHC's first run. The updated results include searches for the Higgs boson in association with top quarks, measurements of the spin and parity, and improved and combined coupling measurements, all showing good compatibility with Standard Model predictions. These results are also being presented at the 50th Rencontres de Moriond ElectroWeak conference, in La Thuile, Italy, this week.

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ATLAS physicist wins L'Oreal-UNESCO Women in Science award

12th March 2015 – Rajaâ Cherkaoui El Moursli is one of the five laureates of the L'Oreal-UNESCO for Women in Science Awards this year.

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ATLAS' Higgs ML Challenge Data Open to Public

5th March 2015 – The dataset from the ATLAS Higgs Machine Learning Challenge has been released on the CERN Open Data Portal.

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