Featured Research

from universities, journals, and other organizations

Supersymmetry squeezed as Large Hadron Collider spots ultra rare particle decay

Date:
November 13, 2012
Source:
University of Cambridge
Summary:
Scientists at the Large Hadron Collider (LHC) at CERN, near Geneva, have spotted one of the rarest particle decays ever seen in nature. The result is very damaging to new theories like the extremely popular Supersymmetry.

Primary interaction.
Credit: CERN

Cambridge scientists at the Large Hadron Collider (LHC) at CERN, near Geneva, have spotted one of the rarest particle decays ever seen in nature.

Related Articles


The result is very damaging to new theories like the extremely popular Supersymmetry.

Current knowledge about the most fundamental matter particles (quarks and leptons, such as an electron) and the forces between them is embedded in the so-called Standard Model. The particle masses are a consequence of their interactions with the Higgs field. Exciting the Higgs field in particle collisions at the LHC recently resulted in the discovery of the Higgs boson.

However, the Standard Model is not the ultimate theory; it does not include gravity nor explain 95% of the Universe, which is in the form of Dark Matter and Dark Energy.

Supersymmetry is called in to fill some of the gaps of the Standard Model. Since it predicts new phenomena, the theory of Supersymmetry can be thoroughly tested at the LHC. A very good place to search is through the decay of a Bs particle (composed of a beauty quark and a strange anti-quark) into two muons (very heavy electrons). It is expected to be a very rare event but can be greatly enhanced be the presence of new physics.

This decay has been observed for the first time by a team at the LHC beauty (LHCb) experiment, a gigantic particle detector at one of the collision points on the 27 km LHC collider.

The LHC, the world's most powerful particle accelerator ever built, has been accelerating protons to almost the speed of light and bringing them to collision since November 2009. Each collision produces a shower of particles, among which a Bs particle is occasionally present. The Bs particle is not stable and decays an instant (within a million millionth of a second) after its production. During its short lifetime, it travels far enough (approximately a centimetre) to be observed by the LHCb detector. It can decay in a variety of other particles and in an extremely rare occurrence, about one in 300 million chance, into two muons.

The team of physicists has analysed the tremendous amount of collisions recorded by LHCb, searching for this decay. In the end, they have spotted a handful of likely candidates. Observing this ultra-rare decay is a triumph for LHCb.

Professor Val Gibson, leader of the Cambridge LHCb team, says "An observation of this very rare decay is a key result that is putting our Supersymmetry theory colleagues in a spin. Results of this quality rely on the dedication and enthusiasm of research post-docs who analyse the data as it pours from the experiment"

The observation is bang on the Standard Model prediction, but comes as very bad news for supporters of Supersymmetry. Indeed, new physics failed to show up where it had the best opportunity. "If new physics exists, then it is hiding very well behind the Standard Model" commented Cambridge physicist Dr Marc-Olivier Bettler, a member of the analysis team.

Nevertheless, Supersymmetry also benefits from this measurement, as Dr Bettler explains "This result is important because it tells us what new physics is not."


Story Source:

The above story is based on materials provided by University of Cambridge. The original story is licensed under a Creative Commons Licence. Note: Materials may be edited for content and length.


Cite This Page:

University of Cambridge. "Supersymmetry squeezed as Large Hadron Collider spots ultra rare particle decay." ScienceDaily. ScienceDaily, 13 November 2012. <www.sciencedaily.com/releases/2012/11/121113095018.htm>.
University of Cambridge. (2012, November 13). Supersymmetry squeezed as Large Hadron Collider spots ultra rare particle decay. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2012/11/121113095018.htm
University of Cambridge. "Supersymmetry squeezed as Large Hadron Collider spots ultra rare particle decay." ScienceDaily. www.sciencedaily.com/releases/2012/11/121113095018.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins