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ATLAS Experiment
particles, physics, higgs, collider
particles, physics, higgs, collider

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[Physics Briefing] ATLAS searches for double Higgs production

The Brout-Englert-Higgs (BEH) mechanism is at the core of the Standard Model, the theory that describes the fundamental constituents of matter and their interactions. It introduces a new field, the Higgs field, through which the weak bosons (W+/- and Z) become massive while the photon remains massless. The excitation of this field is a physical particle, the Higgs boson, which was discovered by the ATLAS and CMS collaborations in 2012...

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[Press Statement] ATLAS observes elusive Higgs boson decay to a pair of bottom quarks

Geneva, 28 August 2018. The ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) has – at long last – observed the Higgs boson decaying into a pair of bottom (b) quarks. This elusive interaction is predicted to make up almost 60% of the Higgs boson decays and is thus primarily responsible for the Higgs natural width...

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The ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) has – at long last – observed the Higgs boson decaying into a pair of bottom (b) quarks.

In this video, our physicists explain why the observation of this interaction - which is predicted to make up almost 60% of the Higgs boson decays - is such an important milestone for physics!

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Watch today's CERN-LHC Seminar at 11h CEST:

Observation of the H->b bbar decay at ATLAS and CMS

"This seminar presents the observation of the Higgs boson decay to a bottom quark-antiquark pair by the ATLAS and CMS experiments. The results presented use all available datasets from the LHC Run 1 and Run 2 including the most recent 13 TeV dataset that corresponds to an integrated luminosity of ~80 fb^-1. The analysis strategy and the background estimation techniques are discussed and a comprehensive set of measurements are presented."

The speakers are Luca Perrozzi (ETH Zurich (CH)) on behalf of the Compact Muon Solenoid - CMS Collaboration, and Nicolas Morange (LAL, CNRS (FR)) on behalf of the ATLAS Collaboration.

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Give us your input!

It has been over two years since we updated the ATLAS Public Website, and we think it is time to freshen things up! Would you be willing to help? Please give us your honest opinions and suggestions in this very quick survey:

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[Physics Briefing] Stronger together: combining searches for new heavy resonances

While the Standard Model has proven tremendously successful, much experimental evidence points to it not being a complete description of our universe. The search for “new physics” is therefore an important component of the ATLAS experimental programme, where a number of analyses are looking for signs of new heavy particles decaying to different final states...

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ATLAS Around the World: the faces behind the physics

“Multiculturalism” isn’t just a buzzword for ATLAS, it’s a way of life. With members of over 90 different nationalities – spanning every populated continent – ATLAS is a cultural experiment as much as it is a scientific one.

The ATLAS Around the World series invites you to meet people from every nationality represented in the collaboration, to gain an insight into the individual journeys that brought them to particle physics. All are from very different backgrounds, but share the common goal of understanding our universe.

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[Physics Briefing] Could a new type of quark fix the “unnaturalness” of the Standard Model?

While the discovery of the Higgs boson at the Large Hadron Collider (LHC) in 2012 confirmed many Standard Model predictions, it has raised as many questions as it has answered. For example, interactions at the quantum level between the Higgs boson and the top quark ought to lead to a huge Higgs boson mass, possibly as large as the Planck mass (>1018 GeV)...

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[ATLAS Blog] Boosting high-energy physics education around the world with ATLAS Open Data

Since the beginning of ATLAS, collaboration members have devoted hours, days, weeks and months teaching High Energy Physics (HEP) to anyone willing to listen. But sometimes those willing to listen do not have the means, especially when oceans and continents separate them from our experiment in Geneva. How can we overcome these geographical distances to allow anyone interested in HEP to learn?

Find out how the ATLAS Open Data project is addressing this issue:

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[ATLAS News] ATLAS revealed key results at #ICHEP2018

Results shown included major developments in the measurement of Higgs boson properties, observations of key electroweak production processes and new high­-precision tests of the Standard Model...

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