From The BASE: Baryon Antibaryon Symmetry Experiment at The European Organization for Nuclear Research [Organisation européenne pour la recherche nucléaire] [Europäische Organisation für Kernforschung](CH) [CERN] via Interactions.org : “BASE breaks new ground in matter-antimatter comparisons”

The European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] BASE: Baryon Antibaryon Symmetry Experiment.

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View of the BASE experiment.

The collaboration has made the most precise comparison yet between protons and antiprotons and tested whether or not they behave in the same way under the influence of gravity.

In a paper published today in the journal Nature, the BASE collaboration at CERN reports the most precise comparison yet between protons and antiprotons, the antimatter counterparts of protons.

Analysing proton and antiproton measurements taken over a year and a half at CERN’s antimatter factory, a unique facility for antimatter production and analyses, the BASE team measured the electric charge-to-mass ratios of the proton and the antiproton with record precision. The results found these are identical to within an experimental uncertainty of 16 parts per trillion.

“This result represents the most precise direct test of a fundamental symmetry between matter and antimatter, performed with particles made of three quarks, known as baryons, and their antiparticles,” says BASE spokesperson Stefan Ulmer.

According to the Standard Model, which represents physicists’ current best theory of particles and their interactions, matter and antimatter particles can differ, for example in the way they transform into other particles, but most of their properties, including their masses, should be identical.

Standard Model of Particle Physics, Quantum Diaries.

Finding any slight difference between the masses of protons and antiprotons, or between the ratios of their electric charge and mass, would break a fundamental symmetry of the Standard Model, called CPT symmetry, and point to new physics phenomena beyond the Model.

Such a difference could also shed light on why the universe is made up almost entirely of matter, even though equal amounts of antimatter should have been created in the Big Bang. The differences between matter and antimatter particles that are consistent with the Standard Model are smaller by orders of magnitude to be able to explain this observed cosmic imbalance.

To make their proton and antiproton measurements, the BASE team confined antiprotons and negatively charged hydrogen ions[1], which are negatively charged proxies for protons, in a state-of-the-art particle trap called a Penning trap. In this device, a particle follows a cyclical trajectory with a frequency, close to the cyclotron frequency, that scales with the trap’s magnetic-field strength and the particle’s charge-to-mass ratio.

[1] A hydrogen atom that has captured an extra electron.

Alternately feeding antiprotons and negatively charged hydrogen ions one at a time into the trap, the BASE team measured, under the same conditions, the cyclotron frequencies of these two kinds of particle, allowing their charge-to-mass ratios to be compared.

Performed over four campaigns between December 2017 and May 2019, these measurements resulted in more than 24000 cyclotron-frequency comparisons, each lasting 260 seconds, between the charge-to-mass ratios of antiprotons and negatively charged hydrogen ions. From these comparisons, and after accounting for the difference between a proton and a negatively charged hydrogen ion, the BASE researchers found that the charge-to-mass ratios of protons and antiprotons are equal to within 16 parts per trillion.

“This result is four times more precise than the previous best comparison between these ratios, and the charge-to-mass ratio is now the most precisely measured property of the antiproton.” says Stefan Ulmer. “To reach this precision, we made considerable upgrades to the experiment and carried out the measurements when the antimatter factory was closed down, using our reservoir of antiprotons, which can store antiprotons for years.” Making cyclotron-frequency measurements when the antimatter factory is not in operation is ideal, because the measurements are not affected by disturbances to the experiment’s magnetic field.

In addition to comparing protons and antiprotons with an unprecedented precision, the BASE team used their measurements to place stringent limits on models beyond the Standard Model that violate CPT symmetry, as well as to test a fundamental physics law known as the weak equivalence principle.

According to this principle, different bodies in the same gravitational field undergo the same acceleration in the absence of friction forces. Because the BASE experiment is placed on the surface of the Earth, its proton and antiproton cyclotron-frequency measurements were made in the gravitational field on the Earth’s surface. Any difference between the gravitational interaction of protons and antiprotons would result in a difference between the proton and antiproton cyclotron frequencies.

Sampling the varying gravitational field of the Earth as the planet orbits around the Sun, the BASE scientists found no such difference and set a maximum value on this differential measurement of three parts in 100.
“This limit is comparable to the initial precision goals of experiments that aim to drop antihydrogen in the Earth’s gravitational field,” says Ulmer. “BASE did not directly drop antimatter in the Earth’s gravitational field, but our measurement of the influence of gravity on a baryonic antimatter particle is conceptually very similar, indicating no anomalous interaction between antimatter and gravity at the achieved level of uncertainty.”

See the full article here.


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BASE AT CERN

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] BASE: Baryon Antibaryon Symmetry Experiment.

The BASE Project was approved by the CERN Research Board in June 2013. The BASE group at CERN constructed a new Penning trap apparatus which has been commissioned in CERN’s antiproton run 2014 at the Antiproton Decelerator (AD). A specialty of BASE is a reservoir trap for antiprotons, which allows us to trap a cloud of antiprotons, decouple from the accelerator and to dispense single antiprotons into the precision Penning trap cycle. Due to the 10-19 mbar vacuum in our trap can we can store antiprotons for months and even bridge the AD winter shutdown. The working principle is demonstrated on the figure below, the upper graph shows the content of the reservoir. The second plot shows the content of one of our precision traps and the third graph the content of our magnetic bottle trap. At 57h, a single particle was extracted from the reservoir and shuttled to the precision trap. At 125h, we applied the same principle, performed measurements on this particle and eventually shuttled it at 155h to the magnetic bottle trap. At 163h, the measurements were turned off due to a power cut of 10h. After 178h, the traps were switched-on again.

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THE FOUR MAJOR PROJECT COLLABORATIONS

ATLAS
European Organization for Nuclear Research [Organisation européenne pour la recherche nucléaire](CH) ATLAS.

ALICE
European Organization for Nuclear Research [Organisation européenne pour la recherche nucléaire](CH) ALICE .

CMS
European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) CMS.

LHCb
European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) LHCb.

LHC

European Organization for Nuclear Research [Organisation européenne pour la recherche nucléaire(CH) map.

CERN LHC underground tunnel and tube.

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OTHER PROJECTS AT CERN

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU)[CERN] AEGIS.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN]ALPHA Antimatter Factory.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] ALPHA-g Detector.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] AMS.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] ASACUSA.

CERN ATRAP.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] Antiproton Decelerator.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] AWAKE.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] BASE: Baryon Antibaryon Symmetry Experiment.

CERN BASE experiment

</a European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] CAST Axion Solar Telescope.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] CLOUD.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] COMPASS.

CERN CRIS experiment

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN]DIRAC.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] FASER experiment schematic.
CERN FASER is designed to study the interactions of high-energy neutrinos and search for new as-yet-undiscovered light and weakly interacting particles. Such particles are dominantly produced along the beam collision axis and may be long-lived particles, travelling hundreds of metres before decaying. The existence of such new particles is predicted by many models beyond the Standard Model that attempt to solve some of the biggest puzzles in physics, such as the nature of dark matter and the origin of neutrino masses.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] GBAR.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN]ISOLDE Looking down into the ISOLDE experimental hall..

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] LHCf.

CERN-The MoEDAL experiment- a new light on the high-energy frontier.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] NA62.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] NA64..

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] NTOF.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN]TOTEM.

European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] UA9.

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European Organization for Nuclear Research (Organisation européenne pour la recherche nucléaire)(EU) [CERN] Proto Dune.

HiRadMat -High Radiation to Materials at CERN