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Particle physics

18 February 2021
chrisp

The Swiss research infrastructure for particle physics CHRISP

Matter and Material Particle physics CHRISP

Researchers are looking for deviations in the current standard model of physics and want to find out how our universe is constructed.

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27 January 2021
Aldo Antognini

Size of helium nucleus measured more precisely than ever before

Media Releases Matter and Material Particle physics Research with muons CHRISP

In experiments at the Paul Scherrer Institute PSI, an international research collaboration has measured the radius of the atomic nucleus of helium five times more precisely than ever before. The new value can be used to test fundamental physical theories.

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18 January 2021
Georg Bison (links), Bernhard Lauss (Mitte) und Klaus Kirch

Magnetically shielded from the rest of the world

Research Using Neutrons Matter and Material Particle physics CHRISP

At the Paul Scherrer Institute PSI, researchers together with a company have constructed a room that is one of the best magnetically shielded places on the earth. With its help, they want to solve the last mysteries of matter and answer a fundamental question: Why does matter - and thus why do we - exist at all?

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13 July 2020
Teilchenphysik Teaser

In search of new physics

Matter and Material Particle physics Research with muons

With the high-intensity proton accelerator HIPA, the Paul Scherrer Institute generates elementary particles to clarify how the universe is structured. Using pions, muons, and neutrons, the researchers conduct experiments to test the standard model of particle physics.

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7 May 2020
Teaser Pionic Helium

Long-lived pionic helium: Exotic matter experimentally verified for the first time

Particle physics Matter and Material

Exotic atoms, in which electrons are replaced by other particles, allow deep insights into the quantum world. After eight years, an international group of scientists have succeeded in a challenging experiment conducted at PSI’s pion source: they created an artificial atom called “pionic helium”.

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28 February 2020
Philipp Schmidt-Wellenburg und Georg Bison

Tracking down the mystery of matter

Media Releases Particle physics Research Using Neutrons

At the ultracold neutron source at PSI, researchers have measured a property of the neutron more precisely than ever before: its electric dipole moment. That's because the search is still on for an explanation of why, after the Big Bang, there was more matter than antimatter.

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24 July 2018

Material from PSI helps to check inconsistencies in the Big Bang theory

Media Releases Research Using Neutrons Matter and Material Particle physics

Shortly after the Big Bang, radioactive Beryllium-7 atoms were formed, which today, throughout the universe, they have long since decayed. A sample of beryllium-7 artificially produced at PSI has now helped researchers to better understand the first minutes of the universe.

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14 September 2017
teaser picture

The hard worker from Val Mesolcina

Matter and Material Research with muons Particle physics

For Aldo Antognini, physics and conviviality are in the bloodPSI researcher Aldo Antognini has received more than 2.2 million Swiss francs from the EU for his latest experiment. He wants to find out how magnetism is distributed in the proton. The particle physicist will be able to apply not only his scientific and technical talents, but his social flair as well.

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9 March 2016
teaser picture

Five hundred thousand times less likely than winning the lottery

Media Releases Large Research Facilities Research with muons Particle physics

Measuring the rarity of a particle decayIn the so-called MEG experiment at the PSI, researchers are searching for an extremely rare decay signature from a certain kind of elementary particles known as muons. More precisely, they are quantifying its improbability. According to their latest number, this decay occurs less than once in 2.4 trillion events. By means of this result, theoretical physicists can sort out which of their approaches to describing the universe will hold up against reality.

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8 December 2015

Measuring the simultaneity

Research with muons Particle physics

What does a physicist do when his experiment needs an extremely precise time measurement? So precise that existing electronics cannot help him? A scientist from the Paul Scherrer Institute PSI simply decided to develop his own solution. The result is called DRS4, a high-precision electronic chip that could unlock the physics of our entire universe. As an additional benefit, the chip is already helping doctors to localise brain tumours with great accuracy.

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This is a text from the PSI media archive. The contents may be out-of-date.
2 October 2015

New method will enable most accurate neutron measurement yet

Media Releases Research Using Neutrons Particle physics

Our universe consists of significantly more matter than existing theories are able to explain. This is one of the great puzzles of modern science. One way to clarify this discrepancy is via the neutron’s so-called electric dipole moment. In an international collaboration, researchers at PSI have now devised a new method which will help determine this dipole moment more accurately than ever before.

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This is a text from the PSI media archive. The contents may be out-of-date.
24 February 2014
teaserbild.jpg

The proton accelerator at the Paul Scherrer Institute: forty years of top-flight research

Media Releases Particle physics Matter and Material Large Research Facilities Research Using Neutrons Research with muons

Materials research, particle physics, molecular biology, archaeology à for the last forty years, the Paul Scherrer Institute’s large-scale proton accelerator has made top-flight research possible in a number of different fields.

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This is a text from the PSI media archive. The contents may be out-of-date.
31 October 2013

Rare particle decays support standard model

Matter and Material Particle physics

Researchers from the Paul Scherrer Institute have observed for the first time the extremely rare decay of the Bs meson into two muons. They have determined its decay frequency with sufficient accuracy using data collected by the CMS detector at CERN. Their result agrees with the predictions of the standard model of particle physics.

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This is a text from the PSI media archive. The contents may be out-of-date.
1 October 2013

The quest for an elusive white crow of particle physics

Research with muons Particle physics

A very rare process in nature should best decide on how we should describe our universe in the future. It is the particular decay of a particular type of elementary particle: the muon. These particles are short-lived and decay into a variety of other particles. According to one theoretical model, a very particular decay process is practically forbidden, whereas according to another it should be allowed. Which theory is correct? By observing many hundreds of trillions of muon decays very precisely, physicists at the Paul Scherrer Institut have come a step closer to solving this puzzle. They have now published their results in the journal Physical Review Letters.

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This is a text from the PSI media archive. The contents may be out-of-date.
20 June 2013
teaserbild.jpg

Searching for the Higgs boson: PSI inside

Matter and Material Particle physics

“Higgs Particle Found” announced the media triumphantly in July 2012. But for Roland Horisberger, particle physicist at PSI, this was a premature conclusion: “It will take at least another five years before we can be sure of that”. Whatever the findings à whether this is the original Higgs boson, or only one of the theoretical “Higgs-like” particles à one can surely put a tag on them that reads “PSI inside.”

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This is a text from the PSI media archive. The contents may be out-of-date.
25 January 2013

Proton size puzzle reinforced!

Media Releases Particle physics Research with muons Large Research Facilities Matter and Material

An international team of scientists confirmed the surprisingly small value of the proton radius with laser spectroscopy of exotic hydrogen. The experiments were carried out at PSI which is the only research institute in the world providing the necessary amount of muons for the production of the exotic hydrogen atoms made up of a muon and a proton.

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This is a text from the PSI media archive. The contents may be out-of-date.
7 January 2013
teaserbild.jpg

The weak side of the proton

Media Releases Matter and Material Research with muons Particle physics

An international research team has determined with a high level of accuracy, how the proton participates in the weak interaction à one of the fundamental forces of nature. Their results confirm the predictions of the Standard Model of particle physics. The experiment observed the probability of muon capture by protons à a process governed by the weak interaction. The experiment was conducted at the Paul Scherrer Institute, the only institute in the world with an accelerator capable of generating enough muons for carrying out this project in a realistic timeframe.

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This is a text from the PSI media archive. The contents may be out-of-date.
4 July 2012
teaserbild.jpg

Observation of a New Particle with a Mass of 125 GeV

Media Releases Matter and Material Particle physics

In a joint seminar today at CERN and the ICHEP 2012 conference in Melbourne, researchers of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) presented their preliminary results on the search for the standard model (SM) Higgs boson in their data recorded up to June 2012.

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This is a text from the PSI media archive. The contents may be out-of-date.
23 November 2011
teaserbild.jpg

Erkenntnis aus dem Nichts

Media Releases Matter and Material Particle physics Research with muons

Zwei Experimente mit massgeblicher Beteiligung von Forschern des Paul Scherrer Instituts PSI liefern wichtige Ergebnisse bei der Suche nach der richtigen Beschreibung der Welt der kleinsten Teilchen. In den Experimenten haben die Physiker nach sehr seltenen Teilchenzerfällen gesucht. In beiden Fällen konnte der gesuchte Zerfall nicht beobachtet werden wodurch bestimmte Modelle der Teilchenphysik ausgeschlossen werden konnten.This news release is only available in German.

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This is a text from the PSI media archive. The contents may be out-of-date.
25 January 2011
teaserbild.jpg

How strong is the weak force?

Media Releases Matter and Material Research with muons Particle physics

A new measurement of the muon lifetime à the most precise determination of any lifetime à provides a high-accuracy value for a crucial parameter determining the strength of weak nuclear force. The experiments were performed by an international research team at the accelerator facility of the Paul Scherrer Institute.

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