Narrowing in on a W Boson Mass

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Scientists operative on a ATLAS examination during a Large Hadron Collider (LHC)—the world’s largest molecule collider, hosted during CERN, a European molecule prolongation laboratory—have precisely totalled a mass of a W boson, a molecule that plays a pithy purpose in a ethereal balancing act of a quantum universe. This dimensions is regarded as one of a many formidable in molecule prolongation and a initial of a kind for an LHC experiment. The new outcome is unchanging with predictions and allied to a pointing of prior measurements done during a Tevatron collider during Fermilab.

“Achieving such a accurate dimensions notwithstanding a perfectionist conditions benefaction in a hadron collider such as a LHC is a good challenge,” says a orator of a ATLAS Collaboration, Karl Jakobs. “Reaching identical pointing to that formerly performed during other colliders, with usually one year of Run 1 data, is remarkable. It is a distinguished instance of a ability to urge a believe of a Standard Model and demeanour for signs of new prolongation by rarely accurate measurements during a LHC.”

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ATLAS Experiment eventuality display: a W boson decays into one muon and one neutrino (Credit: ATLAS Collaboration)

The U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) is a partial of a ATLAS Collaboration. Brookhaven National Laboratory serves as a U.S. horde laboratory for a 45 U.S. institutions operative on a ATLAS experiment.

The quantum star is a ethereal ecosystem in that particles and army are closely associated in a subatomic balancing act. Over a years, theorists have grown really accurate predictions about any particle’s properties formed on initial measurements, and a mathematical relations between them contained in a Standard Model—the world’s best field-guide to subatomic particles.

For instance, a W boson is a large molecule and a conduit of a diseased force, a subatomic superpower that enables quarks (the point-like particles found inside protons and neutrons) to switch their identities.

This new dimensions by a ATLAS experiment, published Feb. 6 in a European Physical Journal C, pegged a W boson mass as 80370±19 million nucleus volts (MeV), that is in a same round park as a fanciful prediction, though not nonetheless accurate adequate to see if speculation lines adult accurately with experiment.

Measuring a mass of a W boson as good as we can is generally critical given it is one of a categorical mixture in a systematic equation that predicts a mass of a Higgs boson, that was detected during a LHC and is a essential member of a Standard Model.

“Prior to a Higgs find in 2012, we limited a probable masses to a tiny window formed on a measurements of a W boson and Top quark,” says Bodhitha Jayatilaka, a researcher during Fermilab who worked on a W boson dimensions during a Tevatron. “By serve restrictive a mass of a W boson, we can see if there are other mixture that competence be tipping a beam and personally conversion a mass of a Higgs boson.”

The LHC dimensions is formed on around 14 million W bosons available by ATLAS given 2011. It relies on a consummate calibration of a detector and of a fanciful displaying of W-boson production. Further research with a outrageous representation of now-available LHC information will concede even larger correctness in a nearby future.


  • View a associated essay by Brookhaven National Laboratory
  • View a associated CERN press statement

Note: This essay is blending from a Brookhaven National Laboratory article. View a strange article.

Source: Berkeley Lab, created by Sarah Charley, U.S.-CERN/Fermilab.

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