All articles tagged with #lattice qcd
Physicists at BES III report the strongest evidence to date that a glueball—made entirely of gluons—exists, identifying X(2370) as a flavor-singlet state with a mass of about 2.395 GeV/c^2 and roughly 90% gluon content, aligning with lattice QCD predictions and awaiting independent confirmation.
New lattice QCD calculations explain the muon g-2 excess without invoking new particles, aligning with Fermilab’s precise measurement and challenging the older data-driven predictions that relied on electron-positron collision data; at the same time, fresh VEPP-2000 pion-production results and divergent collider measurements renew tensions across experiments, hinting at either unknown particles or overlooked experimental details and underscoring four decades of conflicting data that physicists still need to resolve.
A long-standing puzzle about the muon's anomalous magnetic moment (g-2) is resolved by a new, ultra-precise lattice QCD calculation that aligns the Standard Model prediction with experimental measurements within half a standard deviation. The result removes the need for a hypothetical fifth force and reinforces quantum field theory as the foundation of particle physics, though it may still leave a narrow window for new physics to appear in future experiments.
Penn State researchers using a high-precision, grid-based QCD calculation have shown the muon’s magnetic moment now matches Standard Model predictions to 11 digits (0.5 sigma), resolving a decades‑long discrepancy and cooling expectations for new physics beyond the Standard Model.
A Nature paper using lattice QCD and hybrid simulations shows the muon's anomalous magnetic moment is consistent with the Standard Model within about half a standard deviation and 11 decimal places. The result suggests the earlier discrepancy hinting at a fifth force was a calculation artefact, not new physics, while tightening constraints on possible beyond‑SM explanations through a precise treatment of hadronic vacuum polarization.
The longstanding discrepancy between the theoretical and experimental values of the muon's magnetic moment (g-2) has been resolved, confirming the Standard Model's predictions and showcasing the importance of precise experiments and advanced computational methods like lattice QCD in understanding fundamental physics.
A new study using lattice QCD techniques has calculated the equation of state of the quark-gluon plasma from 3 GeV to 165 GeV, revealing that the strong force played a significant role in the early universe's conditions shortly after the Big Bang, with implications for understanding the universe's evolution and phase transitions.
A new study combining experimental data and lattice Quantum Chromodynamics (QCD) calculations has provided deeper insights into the contributions of gluons to the proton's spin. This collaborative effort, led by Joseph Karpie at Jefferson Lab, aims to resolve the decades-old mystery of proton spin and paves the way for a three-dimensional understanding of the proton's structure.
Physicists from the Tata Institute of Fundamental Research and The Institute of Mathematical Science have predicted the existence of a new subatomic particle, a deeply bound dibaryon made entirely from bottom quarks. The dibaryon, named D6b, is composed of two triply bottom Omega baryons and is predicted to be 40 times stronger than the deuteron, making it the most strongly bound beautiful dibaryon in the visible universe. The finding provides insight into the strong forces in baryon-baryon interactions and motivates the search for heavier exotic subatomic particles in next-generation experiments.
Scientists have determined the gluonic gravitational form factors of the proton, which describe the distribution of the proton's mass and energy. The research was conducted using data from an electron-proton scattering experiment and analyzed using quantum chromodynamics and lattice QCD. The results provide insight into the structure of the proton and could aid in the development of an electron-ion collider, a proposed particle accelerator that could further advance our understanding of the fundamental building blocks of matter.