TH

The rise of the axions!

Roberto Peccei and Helen Quinn worked together in developing what is today known as the Peccei-Quinn symmetry; a mechanism that addresses the strong CP-violation that consequently led to the invention of axions and inspired an intense experimental…

Searching for axions: old and new ideas

QCD, the theory of strong interactions allows the violation of CP symmetry that would result in a non-zero value for the neutron electric dipole moment. Current measurements constrain the neutron EDM to be one trillionth of the size predicted by QCD…

Why is fundamental physics worth researching?

What's the point of investing fortunes into answering questions in advanced physics? 100 years ago, we might have asked the same questions of Schroedinger, Bohr, Heisenberg, Dirac, and the other pioneers of the quantum revolution. After all — what…

The Lifetime Frontier

It bear repeating that there must be physics Beyond the Standard Model (BSM). The triumphant discovery of the 125 GeV Higgs Boson sharpens the Hierarch Problem, with naturalness suggesting new particles at the TeV scale. A multitude of interlocking…

Where is Supersymmetry?

The original ideas The original ideas for introducing supersymmetry dates back in the 1960s when, in the context of hadron physics that was found to be approximately spin-flavour independent, a symmetry between mesons and baryons was proposed. These…

Can ‘useless’ knowledge be useful?

A tomography machine developed at CERN. Machines like this are used in PET (positron emission tomography) scanners for medical imaging. Technology to improve these techniques is being investigated at CERN. (Image: Maximilien Brice/…

Charting the Unknown: interpreting LHC data from the energy frontier

The LHC has started its Run2, exploring for the first time the high-energy frontier at 13 TeV. Collected data will give decisive information on the dynamics behind electroweak symmetry breaking and allow testing the weak-scale…

Hagedorn’s Legacy

A half-day workshop took place last week at CERN on Hagedorn’s Legacy. It provided the forum for discussing the past, present and future of Hagedorn’s contributions to physics, 50 year’s after the publication of his seminal Nuovo Cimento paper…

Guido Altarelli

Guido Altarelli passed away on September 30th, the TH group bid farewell him: "Many memories rush to mind, as tears to our eyes. His ironic humour, his warmth, his kindness, his integrity, his magnificent smile. A pillar of our group is gone.…

In memory of Bruno Zumino: an arcitect of supersymmetry

April 28th would have marked the 92nd birthday of Bruno Zumino, who died last year. The Theory Group organized a meeting around this date to honour his memory and to discuss his legacy. The presentations with slides and videos can be found…

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