Subtle Signs of Fluctuations in Critical Point Search
Physicists analyzing data from gold ion smashups at the Relativistic Heavy Ion Collider (RHIC), a U.S. Department of Energy (DOE) Office of Science user facility for nuclear physics research at DOE’s Brookhaven National Laboratory, are searching for evidence that nails down a so-called critical point in the way nuclear matter changes from one phase to another.Read More
LHC experiments see first evidence of a rare Higgs boson decay
The discovery of the Higgs boson at CERN’s Large Hadron Collider (LHC) in 2012 marked a significant milestone in particle physics. Since then, the ATLAS and CMS collaborations have been diligently investigating the properties of this unique particle and searching to establish the different ways in which it is produced and decays into other particles.Read More
First Measurements of Hypernuclei Flow at RHIC
Physicists studying particle collisions at the Relativistic Heavy Ion Collider (RHIC) have published the first observation of directed flow of hypernuclei. These short-lived, rare nuclei contain at least one “hyperon” in addition to ordinary protons and neutrons. Hyperons contain at least one “strange” quark in place of one of the up or down quarks that make up ordinary nucleons (the collective name for protons and neutrons). Such strange matter is thought to be abundant in the hearts of neutron stars, which are among the densest, most exotic objects in the universe. While blasting off to neutron stars to study this exotic matter is still the stuff of science fiction, particle collisions could give scientists insight into these celestial objects from a laboratory right here on Earth.Read More
ISOLDE takes a solid tick forward towards a nuclear clock
Atomic clocks are the world’s most precise timekeepers. Based on periodic transitions between two electronic states of an atom, they can track the passage of time with a precision as high as one part in a quintillion, meaning that they won’t lose or gain a second over 30 billion years – more than twice the age of the Universe.Read More
‘Light shining through a wall’ experiment ALPS starts searching for dark matter
The world’s most sensitive model-independent experiment to search for particularly light particles, of which dark matter might be composed, starts today at DESY in the form of the ‘light shining through a wall’ experiment ALPS II. Scientific calculations predict that this ominous form of matter should occur five times as often in the universe as normal, visible matter. Until now, however, no one has been able to identify particles of this substance; the ALPS experiment could now furnish such evidence.Read More
JoAnne Hewett Named Director of Brookhaven National Laboratory
The Board of Directors of Brookhaven Science Associates (BSA) has named theoretical physicist JoAnne Hewett as the next director of the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and BSA president. BSA, a partnership between Stony Brook University (SBU) and Battelle, manages and operates Brookhaven Lab for DOE’s Office of Science. Hewett will also hold the title of professor in SBU’s Department of Physics and Astronomy and professor at SBU’s C.N. Yang Institute for Theoretical Physics.Read More
Improved ATLAS result weighs in on the W boson
The W boson, a fundamental particle that carries the charged weak force, is the subject of a new precision measurement of its mass by the ATLAS experiment at CERN. The preliminary result, reported in a new conference note presented today at the Rencontres de Moriond conference, is based on a reanalysis of a sample of 14 million W boson candidates produced in proton–proton collisions at the Large Hadron Collider (LHC), CERN’s flagship particle accelerator.Read More
First WIMP Search Results from the XENONnT Experiment
The XENON collaboration presented today results from XENONnT, the latest-generation experiment of the XENON Dark Matter project dedicated to the direct search for Dark Matter in the form of Weakly Interacting Massive Particles (WIMPs). With an initial exposure slightly larger than 1 tonne x year, a blind analysis shows that the data is consistent with the expectations from the background-only hypothesis.Read More
STAR Physicists Track Sequential 'Melting' of Upsilons
Scientists using the Relativistic Heavy Ion Collider (RHIC) to study some of the hottest matter ever created in a laboratory have published their first data showing how three distinct variations of particles called upsilons sequentially “melt,” or dissociate, in the hot goo. The results, just published in Physical Review Letters, come from RHIC’s STAR detector, one of two large particle tracking experiments at this U.S. Department of Energy (DOE) Office of Science user facility for nuclear physics research.Read More
Clear Sign that QGP Production 'Turns Off' at Low Energy
Physicists report new evidence that production of an exotic state of matter in collisions of gold nuclei at the Relativistic Heavy Ion Collider (RHIC)—an atom-smasher at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory—can be “turned off” by lowering the collision energy. The “off” signal shows up as a sign change—from negative to positive—in data that describe “higher order” characteristics of the distribution of protons produced in these collisions.Read More
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10th Anniversary of the Discovery of the Higgs Boson
Ten years ago, on 4 July 2012, the worldwide collaborations of the ATLAS and CMS experiments at the Large Hadron Collider at CERN announced the long-anticipated discovery of the Higgs Boson. The historic discovery received unprecedented media attention, was recognized with a Nobel Prize and shaped the future of particle physics forever.
Click here to view the CERN symposium livestream on 4 July!