Tag Archive for 'Standard Model'

Physicists Observe Matter-Antimatter Asymmetry in Charm Particle Decays

Mar 22, 2019 by News Staff

Physicists from the Large Hadron Collider beauty (LHCb) Collaboration at CERN have observed, for the first time, the matter-antimatter asymmetry known...

Blyth et al analyzed the gamma rays emitted during the NPDGamma Experiment and found parity-violating asymmetry, which is a specific change in behavior in the force between a neutron and a proton. They measured a 30 parts per billion preference for gamma rays to be emitted antiparallel to the neutron spin when neutrons are captured by protons in liquid hydrogen. After observing that more gammas go down than up, the experiment resolved for the first time a mirror-asymmetric component or handedness of the weak force. Image credit: Andy Sproles / Oak Ridge National Laboratory, U.S. Department of Energy.

Experimental Physicists Measure Weak Force between Protons and Neutrons in Atom’s Nucleus

Dec 27, 2018 by News Staff

Physicists from the NPDGamma Experiment at the DoE’s Oak Ridge National Laboratory (ORNL) have measured the weak interaction between protons and neutrons...

Electrons Are Perfectly Spherical, New Measurements Confirm

Oct 18, 2018 by News Staff

Physicists from the Advanced Cold Molecule Electron Electric Dipole Moment (ACME) Collaboration have examined the shape of an electron’s charge with...

A candidate event display for the production of a Higgs boson decaying to two bottom quarks (blue cones), in association with a W boson decaying to a muon (red) and a neutrino. The neutrino leaves the detector unseen, and is reconstructed through the missing transverse energy (dashed line). Image credit: ATLAS Collaboration / CERN.

Physicists Observe Long-Sought Decay of Higgs Boson to Bottom Quarks

Aug 28, 2018 by News Staff

Physicists from the ATLAS and CMS collaborations at CERN’s Large Hadron Collider have observed the Higgs boson decaying into a pair of bottom quarks...

Visualization of a data event from the tt¯H(γγ) Had BDT bin with the largest signal over background ratio; the event contains two photon candidates, with a diphoton mass of 125.4 GeV; in addition, six jets are reconstructed using the anti-kt algorithm and R = 0.4, including one jet that is b-tagged using a 77% efficiency working point; the photons correspond to the green towers in the electromagnetic calorimeter, while the jets (b-jets) are shown as yellow (blue) cones. Image credit: ATLAS Collaboration.

Physicists Observe Simultaneous Production of Higgs Boson with Top Quark-Antiquark Pair

Jun 8, 2018 by News Staff

In July 2012, ATLAS (A Toroidal LHC ApparatuS) and CMS (Compact-Muon-Solenoid) experiments at CERN’s Large Hadron Collider jointly announced the discovery...

NA62 experiment in CERN’s North Area. Image credit: NA62 / CERN.

CERN Physicists Observe Hints of Ultra-Rare Kaon Decay

Mar 27, 2018 by News Staff

Physicists from the NA62 Collaboration at CERN reported today that they had observed a candidate event of an extremely rare charged kaon decay (K+ →...

Proton is a subatomic particle found in the nucleus of every atom. This artist’s impression shows a proton and a neutron. Image credit: Joanna Griffin / Jefferson Lab / Penn State.

Physicists Precisely Measure Proton’s Magnetic Moment

Nov 27, 2017 by Enrico de Lazaro

In a paper published in the journal Science, a team of physicists from Japan and Germany reports the most precise measurement ever made of the magnetic...

This image shows a visual representation of one of the highest-energy neutrino detections superimposed on a view of the IceCube Observatory at the South Pole. Image credit: IceCube Collaboration.

Earth Can Absorb High-Energy Neutrinos, Physicists Find

Nov 23, 2017 by News Staff

Neutrinos are subatomic particles that are famous for passing through anything and everything. Now, physicists have demonstrated that our planet stops...

Artist’s impression of a cloud of trapped antihydrogen atoms. Image credit: Chukman So.

CERN’s BASE Experiment Reports 350-Fold Improved Measurement of Antiproton’s Magnetic Moment

Oct 19, 2017 by News Staff

In a paper published this week in the journal Nature, the BASE collaboration at CERN reports the most precise measurement ever made of the magnetic moment...

The ATLAS Experiment presented evidence for a first sighting of the Higgs boson decaying to a pair of bottom quarks, with an observed significance of 3.6 sigma. Image credit: ATLAS Collaboration.

Physicists Find Strong Evidence of Higgs Boson Decay to Quarks

Jul 26, 2017 by Enrico de Lazaro

The ATLAS experiment, one of the four major experiments at CERN’s Large Hadron Collider in Switzerland, has reported the first evidence for the decay...

Map of the cosmic microwave background; the insets show the environment of the Cold Spot. The angular diameter of the vast supervoid aligned with the Cold Spot, which exceeds 30 degrees, is marked by the white circles. Image credit: ESA Planck Collaboration / Gergö Kránicz.

When Universes Collide: Galaxy Redshift Survey Hints at Exotic Origin for Mysterious ‘Cold Spot’

Apr 26, 2017 by News Staff

According to the results of a redshift survey of nearly 7,000 galaxies, a gigantic ‘hole’ in the Universe is unlikely to explain a ‘Cold Spot’...

An experiment proposed by Dr. Donald Chang aims at resolving divergence between special relativity and standard model of cosmology. Image credit: NASA / ESA / Hubble Heritage Team / STScI / AURA / J. Blakeslee, NRC Herzberg, DAO / H. Ford, JHU.

Is There a Resting Frame in Universe?

Mar 23, 2017 by News Staff

Physics is sometimes closer to philosophy when it comes to understanding the Universe. Dr. Donald Chang, a physicist at the Hong Kong University of Science...

HE0435-1223, located in the centre of this wide-field image, is among the five best lensed quasars discovered to date. The foreground galaxy creates four almost evenly distributed images of the distant quasar around it. Image credit: NASA / ESA / Hubble / S.H. Suyu et al.

Astronomers Use Gravitational Lensing to Measure Hubble Constant

Jan 27, 2017 by News Staff

Astronomers from the international H0LiCOW (H0 Lenses in COSMOGRAIL’s Wellspring) collaboration have made a new measurement of the Hubble constant —...

Top: schematic of the Penning trap set-up used in CERN’s BASE experiment; a cloud of antiprotons is stored in the reservoir trap (RT), which supplies single particles to the co-magnetometer trap (CT) and the analysis trap (AT) when required; the CT is used for continuous magnetic field measurements; the AT is the trap with the strong superimposed magnetic bottle, which is used to measure the cyclotron frequency and the Larmor frequency. All traps are equipped with radio-frequency excitation electronics and highly sensitive superconducting detection systems. Bottom: results of the six g-factor measurements carried out during CERN’s 2015/2016 accelerator shutdown between February 20 and March 5, 2016; based on this set of measurements H. Nagahama et al extract gp/2=2.7928465(23), as indicated by the red line; the green lines show the 95% confidence level error, the blue line represents the currently accepted value of the proton g-factor gp/2=2.792847350(9); the error bars of the individual measurements are based on the uncertainties of the individual frequency measurements, which are dominated by the random walk in the magnetron mode. Image credit: H. Nagahama et al, doi: 10.1038/ncomms14084.

Physicists Precisely Measure Magnetic Moment of Antiproton

Jan 22, 2017 by News Staff

An international team of physicists led by RIKEN researcher Stefan Ulmer has found that the magnetic moment of the antiproton is extremely close to that...

CERN Physicists Observe Light Spectrum of Antimatter for the First Time

Dec 19, 2016 by News Staff

Physicists from CERN’s ALPHA experiment today report the first ever measurement on the optical spectrum of an antimatter atom. Artist’s impression...

Hubble view of the galaxy cluster Abell 1689. Image credit: NASA / ESA / Hubble Heritage Team / STScI / AURA / J. Blakeslee, Dominion Astrophysical Observatory / H. Ford, JHU.

Study: Universe is Expanding with Constant Velocity

Oct 25, 2016 by News Staff

Hubble view of the galaxy cluster Abell 1689. Image credit: NASA / ESA / Hubble Heritage Team / STScI / AURA / J. Blakeslee, Dominion Astrophysical Observatory...

CERN Physicists Confirm Existence of Bs0 Meson

May 14, 2015 by News Staff

The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations at CERN’s Large Hadron Collider in Switzerland report the first...

This artist's concept shows what the very early Universe might have looked like. Image credit: NASA / JPL-Caltech / R. Hurt / SSC.

Gravity May Have Saved Very Early Universe – Study

Nov 20, 2014 by News Staff

A team of physicists from Denmark, Finland and the United Kingdom, led by Dr Matti Herranen University of Copenhagen, says that the spacetime curvature...

LHCb coil moving. Image credit: © CERN, 2003.

CERN Physicists Discover Two New Particles

Nov 19, 2014 by News Staff

Physicists at CERN’s Large Hadron Collider beauty (LHCb) experiment today announced the discovery of two new baryon particles, named Ξb’- and...

Candidate Higgs Decay to four muons recorded by the ATLAS experiment in 2012 (ATLAS)

Techni-Higgs: European Physicists Cast Doubt on Discovery of Higgs Boson

Nov 10, 2014 by News Staff

Two years after CERN scientists announced the discovery of the famed and elusive Higgs Boson, a team of physicists from Denmark, Belgium, and the United...

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