With ‘Zee burst,’ physicists propose new resonance beyond the standard model — ScienceDaily
Physicists at Washington University in St. Louis have proposed a method to make use of knowledge from ultra-high vitality neutrinos to check interactions beyond the standard model of particle physics. The ‘Zee burst’ model leverages new knowledge from giant neutrino telescopes reminiscent of the IceCube Neutrino Observatory in Antarctica and its future extensions.
“Neutrinos continue to intrigue us and stretch our imagination. These ‘ghost particles’ are the least understood in the standard model, but they hold the key to what lies beyond,” stated Bhupal Dev, assistant professor of physics in Arts & Sciences and writer of a new research in Physical Review Letters.
“So far, all nonstandard interaction studies at IceCube have focused only on the low-energy atmospheric neutrino data,” stated Dev, who’s a part of Washington University’s McDonnell Center for the Space Sciences. “The ‘Zee burst’ mechanism provides a new tool to probe nonstandard interactions using the ultra-high energy neutrinos at IceCube.”
Ultra-high vitality occasions
Since the discovery of neutrino oscillations twenty years in the past, which earned the 2015 Nobel Prize in physics, scientists have made important progress in understanding neutrino properties — however loads of questions stay unanswered.
For instance, the undeniable fact that neutrinos have such a tiny mass already requires scientists to contemplate theories beyond the standard model. In such theories, “neutrinos could have new nonstandard interactions with matter as they propagate through it, which will crucially affect their future precision measurements,” Dev stated.
In 2012, the IceCube collaboration reported the first remark of ultra-high vitality neutrinos from extraterrestrial sources, which opened a new window to check neutrino properties at the highest attainable energies. Since that discovery, IceCube has reported about 100 such ultra-high vitality neutrino occasions.
“We immediately realized that this could give us a new way to look for exotic particles, like supersymmetric partners and heavy decaying dark matter,” Dev stated. For the earlier a number of years, he had been searching for methods to search out indicators of new physics at completely different vitality scales and had co-authored half a dozen papers finding out the potentialities.
“The common strategy I followed in all these works was to look for anomalous features in the observed event spectrum, which could then be interpreted as a possible sign of new physics,” he stated.
The most spectacular characteristic can be a resonance: what physicists witness as a dramatic enhancement of occasions in a slim vitality window. Dev devoted his time to eager about new eventualities that might give rise to such a resonance characteristic. That’s the place the thought for the present work got here from.
In the standard model, ultra-high vitality neutrinos can produce a W-boson at resonance. This course of, often known as the Glashow resonance, has already been seen at IceCube, in keeping with preliminary outcomes introduced at the Neutrino 2018 convention.
“We propose that similar resonance features can be induced due to new light, charged particles, which provides a new way to probe nonstandard neutrino interactions,” Dev stated.
Bursting onto the neutrino scene
Dev and his co-author Kaladi Babu at Oklahoma State University thought of the Zee model, a well-liked model of radiative neutrino mass technology, as a prototype for his or her research. This model permits for charged scalars to be as mild as 100 occasions the proton mass.
“These light, charged Zee-scalars could give rise to a Glashow-like resonance feature in the ultra-high energy neutrino event spectrum at the IceCube Neutrino Observatory,” Dev stated.
Because the new resonance includes charged scalars in the Zee model, they determined to name it the ‘Zee burst.’
Yicong Sui at Washington University and Sudip Jana at Oklahoma State, each graduate college students in physics and co-authors of this research, did intensive occasion simulations and knowledge evaluation displaying that it’s attainable to detect such a new resonance utilizing IceCube knowledge.
“We need an effective exposure time of at least four times the current exposure to be sensitive enough to detect the new resonance — so that would be about 30 years with the current IceCube design, but only three years of IceCube-Gen 2,” Dev stated, referring to the proposed next-generation extension of IceCube with 10 km3 detector quantity.
“This is an effective way to look for the new charged scalars at IceCube, complementary to direct searches for these particles at the Large Hadron Collider.”