Articles tagged with Quarks
The BESIII experiment has made significant discoveries in the study of charmonium and charmoniumlike states, including the observation of conventional and exotic hadrons. The researchers have also uncovered evidence for the commonality among X(3872), Y(4260), and Zc(3900) states.
Two independent studies illuminate unexpected substructures in fundamental components of all matter. One study presents new evidence on the EMC effect by tagging spectator neutrons, offering direct insight into its origin. Meanwhile, a team from Fermilab found evidence that antimatter asymmetry plays a crucial role in nucleon properties.
Researchers at RHIC's PHENIX Collaboration report new data on direct photons, revealing the potential to study gluons' transverse motion within protons. The measurements are 50 times more precise than previous data and validate the approach for future studies of proton spin and structure.
Physicists have developed a groundbreaking theory, LaMET, to calculate the quark and gluon structure of protons traveling at the speed of light. This breakthrough resolves limitations in existing lattice quantum chromodynamics (QCD) theories, allowing for predictions on proton structure that can be tested by future experiments.
The 2021 Fall Meeting of the APS Division of Nuclear Physics presents cutting-edge research on nuclear astrophysics, quantum technology, and rare isotopes. Researchers will discuss breakthroughs such as the most precise measurement of neutron lifetime and novel experiments measuring neutron skin in calcium.
The study uses the Relativistic Heavy Ion Collider to recreate Big Bang conditions, observing a significant enhancement of Ds±/D0 yield ratio compared to PYTHIA simulations. This confirms the role of quark-gluon plasma in open-charm hadron production.
Researchers have discovered a new technique to locate the diffusion wake's signal in the quark-gluon plasma, a subatomic soup that flowed like a friction-free fluid after the Big Bang. This breakthrough may help scientists understand how matter emerged from this perfect fluid.
Scientists propose EicC to investigate quark and gluon contributions to nucleon spin and mass, as well as novel multi-particle dynamics. The recently released white paper outlines physics goals, detector design, and accelerator specifications.
A theoretical physicist has proved a decades-old claim that Quantum Chromo Dynamics (QCD) leads to light-weight pions, resolving the mystery of confinement. By using supersymmetry and anomaly mediation, Principal Investigator Hitoshi Murayama showed QCD indeed creates pions with extremely small mass.
The new Gluon Exchange Model (GEM) describes protons as complex systems with virtual quark-antiquark pairs, challenging the concept of stable diquarks. GEM predicts the disintegration of diquarks in certain collisions, offering a new perspective on proton interactions.
The LHCb experiment has probed the nature of physics for ten years, examining CP violation and symmetry between matter and antimatter. The review highlights its achievements in studying heavy quarks and their interactions, shedding light on the universe's fundamental questions.
Physicists employ advanced computing to study subatomic particles, pushing the boundaries of our understanding. Theoretical framework quantum chromodynamics governs these interactions, with lattice QCD offering insights into the universe's nature.
Researchers observed several thousand protons in an experiment, but did not detect the tell-tale signs of color transparency. This suggests that the proton is more complicated than expected, with its predicted behavior occurring at higher energies than initially thought.
The experiment contradicts a previous study from the late 90s, suggesting that quarks and antiquarks have a smooth asymmetry with no flip of the ratio between anti-up and anti-down quarks. The discovery has implications for understanding the proton's properties and its role in atomic structure.
Researchers at TUM have developed a method to precisely measure the strong interaction between stable and unstable particles, shedding light on atomic nuclei and neutron stars. The breakthrough enables high-precision studies of the dynamics of the strong force.
The LHCb collaboration observes two structures in proton-proton collisions, suggesting the existence of four-charm tetraquark states. The narrower structure is described as a hadron state of mass about 6900 MeV/c2, denoted as X(6900). Understanding the internal structure of hadrons remains a challenge, with QCD models unable to explain...
The University of Kansas has formed a new research team to participate in the ALICE experiment at the Large Hadron Collider, exploring unique opportunities for physics research. The team will study the initial state of QCD matter and probe quantum entanglement with a novel technique.
Woss' doctoral thesis on spinning hadrons earned him the 2019 Jefferson Science Associates Thesis Prize. He used lattice QCD to calculate properties of unique particles that can decay into other hadrons with non-zero spin.
A study found that cormorants' presence in Quark reduces perch populations and catches, especially close to breeding areas. Cormorants consume up to 20-33% of tagged perch individuals, affecting their growth rate and population dynamics.
Researchers have found that neutral pions emitted in the very forward area of polarized proton-proton collisions retain a large degree of left-right asymmetry. This finding suggests reevaluation of previous theories on particle generation. Further study is needed to understand the mechanism underlying this phenomenon.
The COMPASS experiment at CERN is analyzing the proton's inner structure using particle collisions and complex algorithms. The team confirmed a theoretically expected sign change in the Sivers function, which relates to quark orbital motion inside the proton.
Physicists led by Rene Bellwied aim to understand the role of 'dark' matter in the universe's evolution. The team will analyze data from international experiments STAR and ALICE to study the transition from quark-gluon plasma to existing particles.
The Belle II experiment at SuperKEKB Collider has performed the first searches for low mass Z' bosons, hypothetical new particles that could connect ordinary and dark matter. Researchers aim to identify unexpected physical phenomena and develop new principles to improve understanding of the universe.
Dr Johann Rafelski reviews decades of work on quark-gluon plasma, exploring strangeness production and discovery methods. He highlights the evolution of understanding this primordial material, which once filled the Universe, and the ongoing experimental efforts to recreate it.
Researchers verified predictions of particles beyond standard physics, improving restrictions on theories explaining B meson decay anomalies. The analysis used artificial intelligence to eliminate background data and narrowed the area for searching for new physics.
Quark and gluon researcher Nobuo Sato aims to bridge the gap between theory and experiment to understand how these particles form hadrons, which make up protons, neutrons, and other atomic particles. His three-year fellowship will allow him to pursue independent research at Jefferson Lab.
Researchers at TIFR use first-principles calculation to predict the existence of exotic nuclei made of six heavy quarks. The predicted nuclei are stable against strong and electromagnetic decays but can decay through weak interactions, increasing their stability with mass.
Researchers capture particles in an unexplored energy region using photon-proton collisions, providing new insights into the nucleus. The measurements suggest that gluons directly contribute more than 80% of the proton's mass.
Andrea Signori's project, 'Unraveling Hadronization,' aims to improve fragmentation functions and make them more accurate. This will give physicists more confidence in detecting specific quarks in particles, leading to a better understanding of hadronization.
A team of physicists from the University of Kansas is studying gluon saturation, a phenomenon where standard equations describing proton structure don't apply. They aim to better understand how nucleons and nuclei form using quantum chromodynamics.
Jefferson Lab's CEBAF facility has confirmed the production of charm quarks in J/ψ particles following a recent upgrade to its operating energy. This achievement expands the realm of precision nuclear physics research with electron beams at higher energies.
Researchers at Syracuse University's HEP group have measured a 99.999-percent certainty difference in the decay of D0mesons and anti-D0 mesons, revealing asymmetry between matter and antimatter containing charmed quarks. This finding may indicate new physics beyond the Standard Model.
The latest data from the STAR experiment at RHIC show that different flavors of antiquarks contribute differently to proton spin, with up antiquark spins making a greater contribution than down antiquark spins. This result provides new insights into the proton spin puzzle and reveals a more complex picture than previously thought.
Researchers from Tel Aviv University and MIT have identified the explanation for the EMC effect, which describes how quarks move more slowly inside atomic nuclei. The team found that the number of protons and neutrons forming short-ranged correlated pairs determines the speed of quarks.
Researchers developed a universal function that links short-range correlations between protons and neutrons in the nucleus to the EMC Effect, a phenomenon where quarks inside nuclei have lower average momenta than predicted. The study provides a possible explanation for the effect and offers a new perspective on the atom's nucleus.
Researchers discover that quarks move more slowly in larger atoms due to short-range correlated pairs, finding a long-sought explanation for the EMC effect. The study uses data from particle accelerator experiments and confirms that larger nuclei contain more such pairs, resulting in slower-moving quarks.
Research groups calculate the signature of a phase transition in gravitational waves emitted by merging neutron stars, which could reveal the presence of quark matter. A phase transition may occur when densities exceed atomic nuclei and temperatures reach 10,000 times those in the Sun's core.
Researchers have created a theory describing the behavior of superinsulators, which shares properties with quarks. The discovery may lead to experiments that provide conclusive evidence for quark confinement and asymptotic freedom, revolutionizing our understanding of fundamental particles.
Researchers isolated and measured the weak force between protons and neutrons for the first time, revealing a mirror-asymmetric component of the force. The experiment used a unique apparatus to control neutron spin direction, detecting gamma rays emitted by interacting particles.
The Gluonic Excitations Experiment, or GlueX, has completed its first phase of data collection at the Thomas Jefferson National Accelerator Facility. The experiment aims to produce and study hybrid mesons, which can offer new insights into quark confinement and the strong force.
Scientists created ultra-hot quark gluon plasma, a liquid-like state of matter thought to have filled the early universe. They discovered three distinct geometric patterns: circles, ellipses, and triangles.
Some physicists argue that spacetime may emerge from processes closer to reality, such as quarks and hadrons. The concept of spacetime has puzzled humanity for millennia, with some theories suggesting it's a dynamic creation while others propose it's an absolute arena for events.
Researchers at the Niels Bohr Institute have obtained new results using Xenon-ions in the LHC, recreating the initial conditions of the universe at extremely high temperatures. The experiments reveal that the primordial matter behaves like a liquid, with quarks and gluons being quasi-free, challenging theoretical models.
Researchers analyzed experiments at major particle accelerators, shedding new insights into the mechanism of cooling and freeze-out of quark-gluon plasma into current constituents. The study found a critical temperature of 156 MeV for the phase transition, confirming theoretical predictions.
Researchers will continue work on the Higgs boson, Standard Model, and hunt for new phenomena in physics. They aim to understand mass as an 'agent of mass,' crucial for fundamental particles like electrons and quarks.
Researchers at Princeton University have detected the Higgs boson's decay into two bottom quarks, a pathway that confirms theories about matter's nature. The detection gives scientists a new way to study the physical laws governing the universe.
The High-Energy Physics Group at Syracuse University is developing a new tracking device called the Upstream Tracker (UT), which will significantly enhance the capabilities of the LHCb experiment. The UT, supported by a $3.7 million NSF grant, will increase data handling capacity by factors of five to 10.
Researchers from the Institute of Nuclear Physics found no anomalies in a rare decay of charmed baryons, potentially indicating 'new physics' is not present. They improved an upper limit on frequency by up to 100 times, but are still far from detecting any inconsistencies with predictions.
Particle physicists at TU Dresden have observed the scattering of W and Z bosons in two different processes, providing new insights into the weak interaction. This discovery is one of the outstanding results presented at ICHEP2018 and involves a collaboration with research groups from around the world.
The Higgs boson-top quark coupling has been observed at the LHC, confirming theoretical predictions of the Standard Model. The detection was made possible by an increase in the collider's energy, allowing for the distinction between two points as small as 10-18 m apart.
The CMS collaboration has observed the direct coupling of the Higgs boson to the top quark-antiquark pair, a production mechanism considered impossible by the Standard Model. Sophisticated techniques developed by the University of Zurich's Prof. Florencia Canelli enabled this milestone.
Physicists have discovered an interesting asymmetry in the production of charm mesons and their antimatter counterparts, which could affect the detection of neutrinos. The researchers propose that unfavoured quark fragmentation may explain this phenomenon, potentially leading to a high percentage of D+ and D- meson asymmetry.
Researchers have predicted a new type of dibaryon, called di-Omega, composed of six quarks, using advanced simulations on the K computer. The prediction could help scientists understand extreme environments and interactions among elementary particles.
Researchers analyzed unique data from high-energy proton collisions to understand the mechanism of hadronization. They found evidence of a quark-gluon plasma exhibiting liquid-like properties, which can help improve our understanding of particle physics and the universe's early moments.
The Continuous Electron Beam Accelerator Facility (CEBAF) has completed a $338 million upgrade to triple its original energy design and is now ready to begin experiments. The accelerator will enable scientists to study the quark structure of matter with unprecedented precision.
Recent observations of four colliding galaxies in the Abell 3827 cluster suggest that SIMPs, strongly interacting massive particles, may be a new candidate for the universe's elusive dark matter. SIMPs would interact strongly with themselves via gravity but weakly with normal matter, overcoming a major failing of WIMP theory.
Physicists propose that knots in flexible strands of energy called flux tubes link elementary particles, explaining the three-dimensional nature of the universe. The theory provides a natural power source for cosmic inflation, solving two key problems in cosmology.
The 12 GeV Upgrade Project has tripled CEBAF's original operating energy, enabling precise imaging of nuclei and searches for exotic new particles. This upgrades allows researchers to explore the fundamental building blocks of matter at a scale previously inaccessible.
Two Jefferson Lab researchers, Ted Rogers and Justin Stevens, received $750,000 in funding to advance their research on protons and the strong nuclear force. Rogers aims to improve understanding of quark movement, while Stevens seeks to gain insight into hybrid mesons and QCD.
Physicists used lattice QCD and computational resources to predict quantum numbers of omega-c-zero baryons, which were later discovered by an experiment at the Large Hadron Collider. This work helps understand the nature of strong interactions, a crucial aspect of the Universe's behavior.