Searching for supersymmetric Higgs bosons on the compressed frontier

18th December 2017 – The Standard Model has a number of puzzling features. For instance, why does the Higgs boson have a relatively low mass? Could its mass arise from a hidden symmetry that keeps it from being extremely heavy? And what about dark matter? While the Standard Model has some (almost) invisible particles, like neutrinos, those particles can’t account for all of the dark matter observed by cosmological measurements.

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"Stransverse" mass distribution

Squeezing sleptons at the LHC

15th December 2017 – Supersymmetry (SUSY) is an extension of the Standard Model that predicts the existence of “superpartners” with slightly different properties compared to their Standard Model counterparts.    Physicists have been searching for signs of SUSY for over forty years, so far without success, which makes us think that SUSY particles — should they exist — are also heavier than particles in the Standard Model.  However, in order for SUSY to help mitigate some problems with the Higgs boson sector of the Standard Model, SUSY particles should not be too heavy.  And if some SUSY particles are relatively light, then they should be produced copiously at CERN’s Large Hadron Collider (LHC).  So for SUSY to remain an attractive theory of nature, it must be hiding in plain sight in LHC data.

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Explore virtual CERN with ATLAScraft

13th December 2017 – Enter the world of particle physics with the newly-launched ATLAScraft! Players can explore the CERN campus, shrink down to the size of a particle, and even conduct their own “experiments” in educational minigames.

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Broken symmetry: Searches for supersymmetry at the LHC

8th December 2017 – A commentary by ATLAS physicists Paul de Jong and George Redlinger on the history, progress and future of the search for supersymmetry.
 


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Behind the scenes at ATLAS Week

6th November 2017 – A few times a year, the large LHC collaborations such as ATLAS organise an internal overview session. This photo essay will take you to the most recent of these “ATLAS Weeks” – giving you a glimpse behind the curtain, and exploring this essential part of the collaboration structure and life.

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Noble nuclei open new doors in ATLAS physics

31st October 2017 – Take something you think you understand, change it and see what happens. Earlier this month, the ATLAS Experiment put this basic scientific principle to the test during the first Large Hadron Collider (LHC) xenon run. 

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ATLAS finds evidence of the Higgs boson produced in association with a pair of top quarks

26th October 2017 – The ATLAS collaboration has presented evidence of “ttH production”, a rare process where a pair of top quarks emits a Higgs boson. Observing this process would provide new insight into the Higgs mechanism and allow for new studies of how unknown physics might (or might not) change the behaviour of this fundamental particle.

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