The LHCb collaboration has announced the discovery of a new pentaquark particle. The particle, named Pc(4312)+, decays to a proton and a J/ψ particle (composed of a charm quark and an anticharm quark). This latest observation has a statistical significance of 7.3 sigma, passing the threshold of 5 sigma traditionally required to claim a discovery of a new particle.
EUROPEAN STRATEGY ENTERS NEXT PHASE (02.10.2019)
Physicists in Europe have published a 250-page “briefing book” to help map out the next major paths in fundamental exploration. Compiled by an expert physics-preparatory group set up by the CERN Council, the document is the result of an intense effort to capture the status and
prospects for experiment, theory, accelerators, computing and other vital machinery of high-energy physics.
Light-by-light scattering is a very rare phenomenon in which two photons – particles of light – interact, producing another pair of photons. This process was among the earliest predictions of quantum electrodynamics (QED), the quantum theory of electromagnetism, and is forbidden by classical physics theories (such as Maxwell’s theory of electrodynamics).
THERMONUCLEAR FUSION REACTORS
Article about the new thermonuclear fusion reactor developed by the MIT, fueled by 3 types of ions.
Experiences on the Alcator C-Mod tokamak.
See also, in English: https://www.psfc.mit.edu/research/topics/alcator-c-mod-tokamak
US private company Tri Alpha Energy promised to set up the first ever commercial thermonuclear fusion reactor by 2027, investing for this some $ 500 mln.
See also, in English: https://trialphaenergy.com/ ;
PHYSICISTS DISCOVER HIDDEN ASPECTS OF ELECTRODYNAMICS (11.04.2017) (pdf)
Maxwell's theory displays a remarkable feature: it remains unaltered under the interchange of the electric and magnetic fields, when charges and currents are not present. This symmetry is called the electric-magnetic duality.
However, while electric charges exist, magnetic charges have never been observed in nature. If magnetic charges do not exist, the symmetry also cannot exist. This mystery has motivated physicists to search for magnetic charges, or magnetic monopoles.
However, no one has been successful. Agullo and his colleagues may have discovered why.
EPFL scientists have been able to measure the ultrashort time delay in electron photoemission without using a clock. The discovery has important implications for fundamental research and cutting-edge technology.
STILL NO VIOLATION OF LORENTZ SYMMETRY, DESPITE STRONGEST TEST YET (2016) (pdf)
The team of physicists from the Paris Observatory and the University of California, Los Angeles, analyzed 44 years of data from lunar laser ranging (LLR) observations.
In order to analyze the LLR data in the context of Lorentz symmetry, the researchers first developed a "lunar ephemeris," which is a model that accounts for dozens of factors to compute the estimated position, velocity, and orientation of the Moon with respect to the Earth at any given time. The framework for this ephemeris comes from a theory called the standard-model extension (SME), which combines general relativity and the Standard Model of particle physics, and allows for the possibility of Lorentz symmetry breaking.
The researchers' analysis shows that no evidence that LLR depends on the velocity or the direction of its reference frame, indicating no Lorentz symmetry breaking.
Scientists have confirmed the existence of a new kind of matter: "Time crystals".
Two independent groups of scientists claim that they really managed to create in the laboratory "time crystals" ("space-time crystals") — strange crystals, the atomic structure of which is repeated not only in space but also in time, which means that they are constantly transformed without energy costs.
ANNOTATION ABOUT THE ARTICLE "PHYSICSTS CREATED THE FIRST-EVER TIME CRYSTALS" (pdf, in Russian)
OBSERVATION OF DISCREATE TIME - CRYSTALLINE ORDER IN A DISORDERED DIPOLAR MANY - BODY (pdf)