Articles tagged with Mesons
Scientists at Brookhaven National Laboratory have demonstrated that complex calculations can accurately predict the distribution of electric charges in mesons. The new predictions match measurements from low-energy experiments and extend into the high-energy regime planned for future collider experiments.
Debaditya Biswas combines different particle identification methods with machine learning to detect muons hidden in a sea of pions. He plans to simulate reactions and assess the viability of various techniques, including traditional PID, PSD, and machine learning, to optimize muon detection for future experiments.
Karthik Suresh's dissertation on meson decay in GlueX earned him the prestigious 2023 Jefferson Science Associates (JSA) Thesis Prize. His work built upon previous research by Ahmed M. Foda and Amy M. Schertz, contributing to the development of a spectrum of mesons.
Theoretical studies predict the existence of a new family of exotic subatomic particles called beautiful-charming tetraquarks. These particles are composed of four quarks, including two beauty and charm quarks, and two light anti-quarks. The prediction arrives at a fortuitous moment, coinciding with recent discoveries in this domain.
A research team led by Prof. WANG Qun made significant progress in theoretical studies of vector meson spin physics, particularly regarding Ül mesons generated during gold nucleus collisions. Their results published in Physical Review Letters show a significant deviation in spin alignment due to the ambient vector field.
A recent experiment at Jefferson Lab has revealed the radius of the proton's mass generated by gluons, which may have shed light on the origin of its mass. The result indicates that this core has a different size than the proton's well-measured charge radius.
Scientists successfully synthesized the elusive Λ(1405) particle and measured its complex mass, revealing a temporary bound state of a K- meson and proton. The findings may provide insights into the interior of ultra-dense neutron stars and the early formation of the Universe.
Researchers successfully conducted the first Fermi-scale single-particle double-slit experiment using an unstable ρ0 meson in a high-energy heavy-ion collision. The study demonstrates wave-particle duality, where the meson's decay products exhibit interference patterns indicative of quantum entanglement.
Researchers from the STAR Collaboration have observed a global spin alignment signal in heavy-ion collisions, showing a preference for one state over two in phi mesons. The surprising pattern cannot be explained by conventional mechanisms and is linked to local fluctuations in the strong force within the quark-gluon plasma.
Researchers find phi mesons exhibit a clear preference for global spin alignment, contradicting conventional explanations. The results hint at the presence of local fluctuations in the strong force, which could be measured and provide new insights into this fundamental force.
A postdoctoral researcher uses computational tools to characterize light mesons, shedding light on the strong interaction and its role in binding quarks. The study aims to improve understanding of how matter stays together and bridge the gap between experimentalists and theorists.
Researchers have measured the energy dependence of e+e- -> B-anti-B, B-anti-B* and B*-anti-B* reactions in a new energy range, providing insight into exotic Upsilon mesons. The data was collected by the Belle experiment and has the potential to shed light on the structure of highly excited states.
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...
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.
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.
New findings from the University of Kansas shed light on the behavior of gluons in protons. The researchers used ultra-peripheral collisions to study the energy and dipole sizes needed for gluon saturation, a hypothesized phase of matter thought to exist in high-energy protons.
Scientists from HSE and Yandex collaborate on LHCb experiment, discovering CP violation in charm meson decays with statistical significance of 5.3 standard deviations. AI tools improve data selection and analysis, enabling correct interpretation of physical results.
Researchers have successfully bound a kaon to a nucleus, creating an exotic nucleus with two protons and a single kaon. This discovery provides insights into the origin of mass and quantum phenomena like color confinement.
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.
Cristiano Fanelli uses artificial intelligence to optimize particle detectors and study exotic hybrid mesons. He aims to apply deep learning techniques for accurate particle identification, revolutionizing nuclear physics research.
Researchers observed anomalies in decays of beauty mesons, which may be signs of new physics beyond the Standard Model. The inclusion of long-distance effects increased the significance of these findings, reaching a 6.1 sigma value.
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.
Physicists from Cracow and Zurich searched for traces of light inflatons in meson decay, but found none. The absence of a new particle challenges cosmological models relying on general relativity.
A team of international physicists, including UC Santa Barbara postdoctoral scholar Manuel Franco Sevilla, reviewed results from three experiments that suggest lepton universality may need to be revised. The findings, published in Nature, indicate a higher-than-expected tau decay rate in all three experiments.
The first result from Jefferson Lab's upgraded CEBAF demonstrates the feasibility of detecting a potential new form of matter, studying quark structure, and exploring universal glue. The experiment produced two ordinary mesons and studied their production mechanisms.
The LHCb experiment's analysis confirms the Standard Model's predictions for the rare Bs0 meson decay into a muon and anti-muon with exceptional accuracy. The results narrow down parameters for proposed extensions, such as supersymmetric theories.
The Jefferson Lab-NVIDIA collaboration uses Titan's supercomputer to simulate QCD interactions, achieving speedups of seven- to tenfold for calculations. This enables researchers to explore exotic mesons and advance QCD theory.
Associate Professor Dr Joan Vaccaro's research resolves an anomaly in conventional physics by introducing 'T violation', forcing the universe and us into the future. This breakthrough reveals how time evolution and conservation laws emerged, allowing for aging and a flow of time.
Researchers at the Institute of Nuclear Physics have observed a new mechanism creating particles in high-energy collisions, where charm mesons appear in pairs as often as singles. This effect plays a dominant role in producing charm particles and is expected to become more prominent in future accelerators.
Physicists from Polish Academy of Sciences analyze data from LHCb experiment, indicating possible signs of new physics. The analysis shows a deviation of 3.7 sigma in the decay rate of beauty mesons, suggesting that physicists may be on the cusp of discovering new particles beyond the Standard Model.
The Jefferson Lab accelerator has successfully delivered full-energy electrons as part of its commissioning activities for the 12 GeV Upgrade project. This achievement enables scientists to probe deeper into the nucleus of atoms and study the fundamental building blocks of matter.
A team of physicists has published a new calculation that could significantly advance the indirect search for physics beyond the Standard Model. The calculation applies to rare B meson decays, which are being studied for potential clues about undiscovered subatomic particles.
Scientists are searching for exotic mesons that don't fit traditional patterns, which could reveal new insights into QCD. The JLab team uses the Titan Supercomputer to analyze interactions between quarks and gluons in a vacuum, aiming to predict these hypothetical particles from first principles.
Physicists at Syracuse University have discovered a rare subatomic process involving the decay of the Bs meson, confirming its predicted decay into two muons. The finding provides insight into the Standard Model and offers an indirect way to test new models of physics.
Researchers revised a mathematical description of particle interactions, considering two forces unified under extreme conditions like the Large Hadron Collider. They simplified one description of elementary particles' behavior, predicting specific events that future experiments should observe.
Recent findings from the LHCb Collaboration at CERN suggest that Bs meson particles may hold the key to understanding the imbalance of matter and antimatter in the Universe. The research, led by Sheldon Stone, presents a promising new avenue for exploring charge-parity [CP] violation and its implications for particle physics.
Researchers at Rice University have made a significant contribution to the Large Hadron Collider's (LHC) latest discovery, confirming the Standard Model's prediction of the rare B-sub-s meson decay. This finding eliminates any possibility that the decay is related to dark matter theories, such as supersymmetry.
Researchers observed a long-theorized exception to time reversal symmetry, finding certain particle types change into one another six times more often in one direction than the other. The BaBar experiment provided clear conditions for a direct measurement of time violation, confirming quantum field theory.
Recent BaBar experiment data suggest a potential flaw in the Standard Model, with a particular type of particle decay happening more often than predicted. The results are intriguing but require replication and further investigation to confirm or rule out an actual discovery.
Researchers from the Belle Collaboration observed h b (pronounced h-sub-b) and h b (2P) particles in Japan's KEK particle accelerator data. This discovery will help test theories describing the strong force and provide a better understanding of the universe.
Scientists led by Syracuse University physicist Sheldon Stone observed the decay of a rare B meson particle, which may hold clues about the universe's matter-antimatter imbalance and the nature of fundamental forces. The discovery is part of ongoing efforts to understand why the universe evolved with more matter than antimatter.
Laurence Littenberg, Brookhaven Lab physicist, wins W.K.H. Panofsky Prize for discovering a rare kaon decay with a probability of one in ten billion. This achievement sheds light on the universe's fundamental forces and basic building blocks, as explained by the Standard Model.
Scientists at Fermilab's CDF experiment have found evidence of a new, unusual particle called Y(4140), which challenges our understanding of quark combinations. The particle decays into J/psi and phi particles, suggesting a possible composition of charm and anticharm quarks.
Physicists with the CLEO collaboration have confirmed a decades-old prediction by observing a rare and extremely short-lived subatomic particle called charmed-strange meson. The particle decays into a proton and anti-neutron, producing about 10% of all collisions in the accelerator.
The DZero result suggests a preferred oscillation frequency between 17 and 21 times per picosecond, with a 90% confidence level. This milestone capitalizes on significant luminosity improvements in the Tevatron particle accelerator.
Researchers at KEK Laboratory in Japan have observed a new type of interaction among quarks, producing evidence of a beauty quark converting to the lightest down quark. This observation allows for study of fundamental laws of the universe and potential validation or discovery of new physics models.
Researchers at BaBar Collaboration have discovered a new way in which matter-antimatter asymmetry occurs, known as CP direct violation. The study found a significant difference in decay rates between B mesons and their antimatter counterparts.
The BaBar experiment at SLAC has discovered striking matter-antimatter asymmetry in the decay of B and anti-B mesons. The researchers found a clear signal for direct charge parity (CP) violation, with a preference for B meson decays over anti-B meson decays by 13%. This effect is significantly stronger than observed in kaons.
The experiment detected three events consistent with the rare K meson decay, which occurs once in every 7 billion decays. The result suggests a possible departure from the Standard Model, but further analysis is needed to confirm or rule out the discrepancy.
Researchers at the University of Melbourne have discovered a sub-atomic particle called X(3872) that defies explanation using current theories. This 'mystery meson' has unique mass and decay properties that challenge our understanding of quarks and the color force.
Researchers confirm a high degree of asymmetry between matter and antimatter, consistent with the Standard Model Theory. The finding sheds light on why the universe is made mostly of matter.
Researchers at CU-Boulder are part of an international team experimenting with sub-atomic particles to explain how the universe came into existence. They aim to find out why there is more matter than antimatter in the universe.
Researchers at the University of Notre Dame have discovered a new subnuclear particle, an exotic meson, which is composed of quarks and antiquarks rather than just one type. The discovery was made possible by a high-energy particle experiment conducted at Brookhaven National Laboratory.