Candidate Higgs boson rots into two photons in the ATLAS experiment. Credit: CERN
New outcome from the ATLAS experiment at CERN reaches the unprecedented precision of 0.09%.
The ATLAS collaboration has actually attained the most exact measurement to date of the Higgs bosons mass, reporting a worth of 125.11 billion electronvolts with very little uncertainty. The results were stemmed from a mix of measurements from the diphoton and four-lepton channels. These findings are crucial for understanding deep spaces fundamental structure and have been credited to sophisticated calibration methods and powerful restoration algorithms.
In the 11 years since its discovery at the Large Hadron Collider (LHC), the Higgs boson has become a main avenue for shedding light on the fundamental structure of deep space. Exact measurements of the residential or commercial properties of this special particle are amongst the most effective tools physicists need to test the Standard Model, presently the theory that finest explains the world of particles and their interactions. At the Lepton Photon Conference recently, the ATLAS partnership reported how it has measured the mass of the Higgs boson more exactly than ever previously.
The mass of the Higgs boson is not predicted by the Standard Model and should therefore be figured out by experimental measurement. An accurate understanding of this fundamental criterion is crucial to accurate theoretical calculations which, in turn, permit physicists to confront their measurements of the Higgs bosons residential or commercial properties with predictions from the Standard Model.
The ATLAS and CMS collaborations have actually been making ever more precise measurements of the Higgs bosons mass considering that the particles discovery. The brand-new ATLAS measurement combines two results: a brand-new Higgs boson mass measurement based upon an analysis of the particles decay into 2 high-energy photons (the “diphoton channel”) and an earlier mass measurement based on a research study of its decay into 4 leptons (the “four-lepton channel”).
The brand-new measurement in the diphoton channel, which integrates analyses of the full ATLAS information sets from Runs 1 and 2 of the LHC, led to a mass of 125.22 billion electronvolts (GeV) with an unpredictability of just 0.14 GeV. With a precision of 0.11%, this diphoton-channel result is the most accurate measurement to date of the Higgs bosons mass from a single decay channel.
Compared to the previous ATLAS measurement in this channel, the new result benefits both from the full ATLAS Run 2 data set, which reduced the statistical uncertainty by a factor of 2, and from remarkable enhancements to the calibration of photon energy measurements, which reduced the systematic uncertainty by almost a factor of four to 0.09 GeV.
” The innovative and extensive calibration methods utilized in this analysis were vital for pressing the accuracy to such an extraordinary level,” states Stefano Manzoni, convener of the ATLAS electron-photon calibration subgroup. “Their advancement took a number of years and required a deep understanding of the ATLAS detector. They will likewise significantly benefit future analyses.”
When the ATLAS researchers integrated this new mass measurement in the diphoton channel with the earlier mass measurement in the four-lepton channel, they obtained a Higgs boson mass of 125.11 GeV with an unpredictability of 0.11 GeV. With a precision of 0.09%, this is the most precise measurement yet of this fundamental parameter.
” This extremely accurate measurement is the outcome of the ruthless investment of the ATLAS partnership in enhancing the understanding of our information,” states ATLAS representative Andreas Hoecker. “Powerful reconstruction algorithms combined with accurate calibrations are the identifying ingredients of accuracy measurements. The new measurement of the Higgs bosons mass contributes to the significantly comprehensive mapping of this crucial brand-new sector of particle physics.”
The ATLAS cooperation has actually achieved the most precise measurement to date of the Higgs bosons mass, reporting a value of 125.11 billion electronvolts with minimal uncertainty. The mass of the Higgs boson is not forecasted by the Standard Model and should therefore be determined by speculative measurement. An accurate knowledge of this essential parameter is key to accurate theoretical computations which, in turn, permit physicists to confront their measurements of the Higgs bosons homes with predictions from the Standard Model.” This extremely accurate measurement is the result of the unrelenting investment of the ATLAS cooperation in enhancing the understanding of our information,” states ATLAS representative Andreas Hoecker. The brand-new measurement of the Higgs bosons mass includes to the progressively comprehensive mapping of this vital brand-new sector of particle physics.”
