The exploration of the Higgs boson continues

12th March 2018 – Discovering the Higgs boson can be likened to finding a new continent. While a momentous event in itself, the most exciting part remains the exploration of the new land! In a new result presented today at the Rencontres de Moriond, the ATLAS collaboration examined the Higgs boson decaying into two W bosons

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New winners of the ATLAS Thesis Awards

27th February 2018 – The ATLAS Collaboration has over 5500 members in 182 institutions around the globe. But, did you know that over 1000 of these members are PhD students? ATLAS PhD students contribute strongly and critically to all areas of the experiment, while learning valuable skills for their degrees. 

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First high-precision measurement of the mass of the W boson at the LHC

12th February 2018 – In a paper published today in the European Physical Journal C, the ATLAS Collaboration reports the first high-precision measurement at the Large Hadron Collider (LHC) of the mass of the W boson. This is one of two elementary particles that mediate the weak interaction – one of the forces that govern the behaviour of matter in our universe. The reported result gives a value of 80370±19 MeV for the W mass, which is consistent with the expectation from the Standard Model of Particle Physics, the theory that describes known particles and their interactions.

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ATLAS studies the dynamics of very high-momentum top quarks

31st January 2018 – The top quark – the heaviest known fundamental particle – plays a unique role in high-energy physics. Studies of its properties have opened new opportunities for furthering our knowledge of the Standard Model. In a new paper submitted to Physical Review D, the ATLAS collaboration presents a comprehensive measurement of high-momentum top-quark pair production at 13 TeV.

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Measurements of weak top quark processes gain strength

18th January 2018 – The production of top quarks in association with vector bosons is a hot topic at the LHC. ATLAS first reported strong evidence for the production of a top quark in association with a Z boson at the EPS 2017 conference. In a paper submitted to the Journal of High-Energy Physics, the ATLAS experiment describes the measurement of top-quark production in association with a W boson in 13 TeV collisions.

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Reaching out across cultures

5th January 2018 – This past Spring, I had the opportunity to travel to Taos, New Mexico, USA, to work with artist Agnes Chavez, on one of her “Projecting Particles” workshops. Her innovative programme aims to develop STEM (Science, Technology, Engineering, Math) skills in students aged 8 and up, employing a mixture of science education and artistic expression. It is a winning combination for everyone involved.

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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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