From CERN: “CMS and LHCb to present rare B-sub-s particle decay”

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19 July 2013
Cian O’Luanaigh

“New results to be presented today at the European Physical Society’s High Energy Physics conference (EPS-HEP 2013) in Stockholm, Sweden, have put the Standard Model of particle physics to one of its most stringent tests to date. The CMS and LHCb experiments at CERN’s Large Hadron Collider (LHC) will present measurements of one of the rarest measureable processes in physics: the decay of a Bs (pronounced B-sub-s) particle into two muons.

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The new measurements show that only a handful of Bs particles per billion decay into pairs of muons. Because the process is so rare, it is an extremely sensitive probe for new physics beyond the Standard Model. Any divergence from the Standard Model prediction would be a clear sign of something new.

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Protons collide in the CMS detector, producing a Bs particle that decays into two muons (red lines) in this event display from 2012 (Image: CMS)

Both experiments will present results to a very high level of statistical significance (over 4 sigma for each experiment). These results are in good agreement with the Standard Model.

‘This is a great result for LHCb,’ says LHCb spokesperson Pierluigi Campana. ‘It’s precisely for measurements like this that LHCb was built. This result shows that we’re really putting the Standard Model to the most stringent test yet at LHC energies, and so far it’s coming through with flying colours.’

‘This is a process that particle physicists have been trying to find for 25 years,’ says CMS spokesperson Joe Incandela. ‘It demonstrates the incredible capability of the LHC and experiments like CMS that are able to detect such a rare process involving a particle with a mass that is roughly 1000 times smaller than the masses of the heaviest particles we are searching for now.’”

See the full article, with links, here.

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