The Belle II cooperation project at the Japanese research center KEK is helping researchers from all over the world to hunt for new phenomena in particle physics. The international experiment has now reached a major milestone after a team successfully installed a new pixel detector in its final location in Japan. The size of a soda can, the detector was developed in order to make out the signals coming from certain types of particle decays, that can shed light on the origin of the matter-antimatter asymmetry that has been observed in the universe. The installation ran without a hitch and is a key milestone in the evolution of the experiment and German-Japanese research collaboration.

Prof. Dr. Simon Stellmer has been awarded a Proof of Concept Grant by the European Research Council (ERC) as part of a program designed to help researchers translate their ideas from previous ERC projects into commercial applications. The grant is endowed with €150,000.

Neutrinos are among the most abundant particles in the cosmos, but still pose many mysteries to researchers. An international team with participation of the University of Bonn has now for the first time directly observed neutrinos produced in a particle accelerator. The physicists hope that their new discovery will enable them to better understand the nature of these almost massless elementary particles. The results were presented last weekend at the 57th Moriond Conference in Italy and will soon be submitted for scientific peer review in the journal Physical Review Letters.

The W boson is the mediator particle of the electroweak force. Discovered in the 1980s at CERN, its properties remain challenging to measure within the Standard Model of particle physics. An international team has now presented a new and improved W-boson mass measurement by the ATLAS experiment at CERN. Physicists from the University of Bonn were involved in the results: Dr. Philipp König and Dr. Oleh Kivernyk are part of the ATLAS team, which has now presented the results at the Moriond electroweak conference. The two young scientists work in the research groups led by Prof. Dr. Klaus Desch and Priv.-Doz. Philip Bechtle and Prof. Dr. Ian Brock at the Physics Institute.

In seeking an explanation to what holds the world together at its core, particle physicists face many unresolved mysteries. The matter and energy we know make up only five percent of the cosmos; but what is the remaining “dark matter” and “dark energy” made of? Why is there so much matter but so little antimatter in the universe? And why do the second most common known particles in the universe, called neutrinos, have such tiny masses? To answer these fundamental questions, the new Clausius Professor Jun.-Prof. Dr. Lena Funcke and her team are developing models beyond the Standard Model of particle physics and applying novel computational methods for calculating model predictions for future experiments. This will be a new research focus at the University of Bonn in the Transdisciplinary Research Area “Building Blocks of Matter and Fundamental Interactions” (TRA “Matter”).

An international team of astrophysicists has made a puzzling discovery while analyzing certain star clusters. The University of Bonn played a major role in the study. The finding challenges Newton's laws of gravity, the researchers write in their publication. Instead, the observations are consistent with the predictions of an alternative theory of gravity. However, this is controversial among experts. The results have now been published in the Monthly Notices of the Royal Astronomical Society.

Physicists at the University of Bonn have experimentally proven that an important theorem of statistical physics applies to so-called "Bose-Einstein condensates." Their results now make it possible to measure certain properties of the quantum “superparticles” and deduce system characteristics that would otherwise be difficult to observe. The study has now been published in Physical Review Letters.