CMS precisely measures the mass of the Higgs boson

Categories: CMS/LHC, Energy Frontier
Published on: November 13, 2019
Event in which a candidate Standard Model Higgs boson decays into two photons indicated by the green towers representing energy deposited in the electromagnetic calorimeter.

Tthe CMS Collaboration has just announced the most precise measurement of the Higgs boson’s mass achieved so far.  CMS physicists recently measured the mass of the Higgs boson to be 125.35 GeV with a precision of 0.15 GeV, an uncertainty of roughly 0.1%!  This very high precision was achieved thanks to the enormous amount of work spent over many years to carefully calibrate and model the CMS detector when it measures the particles necessary for this measurement (electrons, muons, and photons).

By the CMS Collaboration. You can read this article at the CERN web site.

Professor Higgs’ Particle

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Published on: June 26, 2019
François Englert (left) and Peter Higgs speak to conference attendees at CERN on July 4, 2012, on the occasion of the announcement of the discovery of a Higgs boson by the ATLAS and CMS experiments. Photo: Maximilien Brice/CERN

Fifty years ago physicists, pondering how particles get mass, had suggested that there is another field, but one with no direction and the same value everywhere throughout the universe. 

Dr. Higgs said, “If that field exists, there should be a particle that goes with it,” just as the electromagnetic field, light, has a particle, the photon. The Higgs particle is heavier than a silver atom but trillions of times smaller. Perhaps it has no size at all! It disintegrates to lighter particles immediately and has no practical applications, so what’s the big deal?

By Mike Albrow. Click here for the Fermilab article.

Subatomic CSI

Categories: Physics in a Nutshell
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Published on: March 5, 2017

This DZero event is not thought to have come from a Higgs boson, but an event in which a Higgs boson decayed into a pair of Z bosons would look very similar.
This DZero event is not thought to have come from a Higgs boson, but an event in which a Higgs boson decayed into a pair of Z bosons would look very similar.

How do we make sense of the mess we see in high-energy collisions?

http://news.fnal.gov/2012/04/subatomic-csi/, by Don Lincoln

Origins of mass: It’s not what you think

Categories: Physics in a Nutshell
Published on: January 1, 2017

The Higgs Boson does not account for all of the mass in the Universe.

http://news.fnal.gov/2012/01/origins-of-mass-it-s-not-what-you-think/, by Don Lincoln.

Lepton flavor violation: the search for mismatched Higgs boson decays at CMS

Categories: CMS/LHC
Published on: October 16, 2016

Can the Higgs boson participate in lepton-number violation?

http://news.fnal.gov/2016/09/lepton-flavor-violation-search-mismatched-higgs-boson-decays-cms/, by Bo Jayatilaka.

Higgs boson origami

Categories: CMS/LHC, Energy Frontier
Published on: August 7, 2016

Untangling one of the analysis techniques CMS used to find the Higgs Boson.

http://news.fnal.gov/2016/07/higgs-boson-origami/, by Don Lincoln.

Importance of multivariate analysis

Categories: CDF, Energy Frontier
Published on: July 22, 2016

These physicists were responsible for this analysis. From left: Giorgio Chiarelli, Sandra Leone and Federico Sforza, all from INFN (University of Pisa).

Disentangling signal from background in the CDF Higgs Boson data.

http://news.fnal.gov/2016/07/importance-multivariate-analysis/, by Andy Beretvas and Giorgio Chiarelli

Busy bees

Categories: CMS/LHC
Published on: May 15, 2016

Looking for exceptionally heavy particles decay into two Higgs bosons, which would preferentially decay into four B quarks.

http://news.fnal.gov/2016/03/busy-bees/, by Don Lincoln.

Search for a fermiophobic Higgs

Categories: CMS/LHC, Energy Frontier
Published on: February 25, 2016

CMS and Atlas at CERN found everything was consistent with Standard Model predictions.

http://news.fnal.gov/2016/01/search-for-a-fermiophobic-higgs/, by Andy Beretvas and Yoshi Seiya

Shedding light on the invisible Higgs

Categories: CMS/LHC, Energy Frontier
Published on: September 10, 2015

Are there other decay modes of the Higgs, wherein they decay into invisible particles?

http://www.fnal.gov/pub/today/archive/archive_2015/today15-07-31.html, by Jim Pivarski.

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