Higgs boson

Higgs boson
Name	Higgs boson
Discovered	2012
Discovered by	CERN; ATLAS experiment; CMS experiment
Theoretical prediction	1964
Theorists	Peter Higgs; François Englert; Robert Brout; Gerald Guralnik; C. R. Hagen; Philip Anderson
Mass	~125 GeV/c²
Lifetime	~1.6×10^-22 s

Higgs boson is an elementary particle associated with the mechanism that gives mass to elementary particles. Predicted in 1964 by theoretical physicists Peter Higgs, François Englert, and Robert Brout and others, it was experimentally observed at CERN in 2012 by the ATLAS experiment and the CMS experiment. The discovery confirmed a key component of the Standard Model and connected research programs at facilities like the Large Hadron Collider with theoretical work from institutions such as University of Edinburgh, University of Brussels, and Imperial College London.

Overview

The particle emerges from the spontaneous symmetry breaking mechanism proposed by Peter Higgs and contemporaries, integrating with frameworks developed at Princeton University, Oxford University, and Caltech. Its discovery united efforts across collaborations involving Fermilab, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, KEK, and DESY. The announcement at CERN's CERN by spokespeople from ATLAS experiment and CMS experiment followed decades of experimental programs at accelerators like the Super Proton Synchrotron, Tevatron, and Large Electron–Positron Collider.

Theoretical background

The theoretical framework traces to symmetry studies by Yoichiro Nambu, Yoichiro Nambu's work inspired later models developed at Tokyo University and MIT. The Higgs mechanism operates within gauge theories such as Glashow–Weinberg–Salam model and links to renormalization methods refined by Gerard 't Hooft and Martinus Veltman. Incorporation into the Standard Model required treatments by groups at CERN, Harvard University, University of Chicago, Stanford University, and Columbia University. Related theoretical advances involved Supersymmetry, Grand Unified Theory, and proposals from theorists at Princeton, Rutgers University, and Yale University.

Properties and interactions

The particle is a scalar boson with quantum numbers predicted by calculations performed at SLAC National Accelerator Laboratory, with properties measured by teams from ATLAS experiment and CMS experiment. Its interactions with fermions and bosons follow Yukawa couplings studied at University of Cambridge, University of Oxford, and ETH Zurich. Decay channels include modes investigated by collaborations including LHCb experiment, ALICE experiment, and earlier searches at LEP. Precision determinations rely on detectors and analyses developed at CERN, Fermilab, and DESY over decades alongside theoretical inputs from IHEP (China), INFN (Italy), and CPT (France) groups.

Experimental discovery and confirmation

Evidence accumulated through data-taking runs at Large Hadron Collider's ATLAS experiment and CMS experiment culminating in 2012 followed hints from experiments at Tevatron's CDF and D0 collaborations. The discovery involved global coordination with computing infrastructures like the Worldwide LHC Computing Grid and support from national agencies such as DOE (United States), EPSRC (UK), CNRS (France), Deutsche Forschungsgemeinschaft, and NSF (United States). Subsequent confirmations came from combined analyses integrating results from ATLAS experiment, CMS experiment, LHCb experiment, and reinterpretations by groups at CERN and Institute of High Energy Physics (IHEP).

Production and detection methods

Primary production mechanisms at colliders include gluon fusion studied by groups at CERN, vector boson fusion explored at DESY and Fermilab, associated production with top quarks pursued by ATLAS experiment and CMS experiment, and associated production with vector bosons analyzed at LEP and Tevatron. Detection relied on calorimetry and tracking systems developed by institutions such as RAL, University of Munich, INFN, MIT, Caltech, and University of Wisconsin–Madison. Data analysis techniques drew on statistical methods refined at CERN, SLAC, Brookhaven National Laboratory, Lawrence Livermore National Laboratory, and computational frameworks supported by GridPP and national laboratories across United States, United Kingdom, France, Germany, and Switzerland.

Role in particle physics and cosmology

Confirmation of the particle completed a prediction of the Standard Model and impacted ongoing work in areas pursued at CERN, Fermilab, SLAC, KEK, and DESY. Its properties constrain theories like Supersymmetry investigated at University of California, Berkeley, University of Oxford, and IHEP (China), and affect models of cosmic inflation studied at Princeton University and Institute for Advanced Study. Cosmological implications connect to baryogenesis scenarios developed at Stanford University and University of Chicago and to dark matter searches coordinated by collaborations at XENONnT, LUX-ZEPLIN, and Fermi Gamma-ray Space Telescope teams. Future explorations at planned facilities such as the International Linear Collider, Future Circular Collider, and upgrades at Large Hadron Collider continue to involve international laboratories including KEK, CERN, DESY, and national funding agencies like DOE (United States) and European Research Council.

Category:Elementary particles