Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Discovery Prospects at the Large Hadron Collider

26.04.2006


Will scientists ever find the elusive Higgs particle, the last of the fundamental particles predicted by the Standard Model of particle physics and postulated to play a major role in how fundamental particles get their masses? Are there undiscovered particles “beyond” those described by the Standard Model? Experiments expected to begin next year at the Large Hadron Collider (LHC), a new particle accelerator at the European Center for Nuclear Research (CERN), will take up the search and explore other intriguing questions about matter in our universe.



Ketevi Assamagan, a physicist at the U.S. Department of Energy’s Brookhaven National Laboratory, has been helping to build and coordinate analysis tools for ATLAS, one of the LHC’s multipurpose detectors. He will give a talk on LHC preparations and the facility’s prospects for discovery at the April meeting of the American Physical Society in Dallas, Texas on Sunday, April 23 at 9:06 a.m. (Room Pegasus B, Hyatt Regency Hotel). Brookhaven Lab is the headquarters for the 33 U.S. institutions contributing to the ATLAS project. Worldwide, more than 2,000 scientists are collaborating on ATLAS.

“The Standard Model has been quite successful in explaining the known particles, their properties, and the main interactions of matter — but there are problems,” Assamagan says.


For example, the Standard Model assumes there is only one type of Higgs particle. With this restriction, computations aimed at correcting the mass of the Higgs diverge so that physicists cannot get a finite result they could measure. Another problem is the enormous energy gap between the scale of gravity (the Planck scale) and the scale of the electroweak force, which governs the Standard Model.

To resolve these problems, scientists have proposed alternative theories or extensions to the Standard Model. In addition to searching for the Higgs particle, the LHC — a 27-kilometer ring-shaped accelerator capable of colliding protons or heavy ions — will probe these theories by searching for the kinds of particles they predict.

One extension theory is known as the Minimal Supersymmetric Standard Model (MSSM). “Instead of having only one Higgs particle, you end up with five of them,” Assamagan says. And as in all versions of the theory of Supersymmetry, each of these particles — and each of the other particles of the Standard Model — has a yet-to-be-discovered companion supersymmetric partner. “The existence of supersymmetric particles would protect the Higgs mass against divergent radiative corrections,” Assamagan says.

“Since no one has ever detected a sypersymmetric particle, it would be a very significant finding if we see one or more at the LHC,” he adds. The prospects for such as discovery at the LHC are quite good, he suggests, because the LHC machine will have sufficient energy and collision rates to produce these particles.

The LHC will also explore the idea that “large extra dimensions” exist to bridge the energy gap between the electroweak and Planck scales, as well as other theories that suggest the supposed fundamental particles of the Standard Model are not fundamental at all, but instead are themselves composites — that is, composed of even smaller, more fundamental building blocks yet to be discovered. In addition to exploring these realms “beyond the Standard Model,” LHC experiments will also probe the mysterious missing mass and dark energy of the universe, investigate the reason for nature’s preference for matter over antimatter, and probe matter as it existed at the very beginning of time.

“The ATLAS detector is truly multipurpose, with many different systems for detecting a wide array of particles and reconstructing what happened in the interaction region,” Assamagan says, “so it is not bound to any particular discovery. We hope it is made well enough to discover whatever the case is — even if it is a complete surprise.”

First collisions at the LHC are expected to take place in the summer of 2007.

Brookhaven Lab’s role in this work is funded by the Office of High Energy Physics within the U.S. Department of Energy’s Office of Science.

Karen McNulty Walsh | EurekAlert!
Further information:
http://www.bnl.gov

More articles from Physics and Astronomy:

nachricht Astronomers release most complete ultraviolet-light survey of nearby galaxies
18.05.2018 | NASA/Goddard Space Flight Center

nachricht A quantum entanglement between two physically separated ultra-cold atomic clouds
17.05.2018 | University of the Basque Country

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>