Higgs boson

Frae Wikipedia, the free beuk o knawledge
Jump to navigation Jump to search
Higgs boson
Candidate Higgs Events in ATLAS and CMS.png
Candidate Higgs boson events frae collisions atween protons in the LHC. The tap event in the CMS experiment shaws a decay intae twa photons (dashed yellae lines an green touers). The lawer event in the ATLAS experiment shaws a decay intae 4 muons (reid tracks).[Note 1]
ComposeetionElementar pairticle
StatusA Higgs boson o mass ≈125 GeV wis tentatively confirmed bi CERN on 14 Mairch 2013,[1][2][3] awtho it is unclear as yet which model the pairticle best supports or whether multiple Higgs bosons exeest.[2]
TheorisedR. Brout, F. Englert, P. Higgs, G. S. Guralnik, C. R. Hagen, an T. W. B. Kibble (1964)
DiscoveredLarge Hadron Collider (2011–2013)
Mass125.09±0.21 (stat.)±0.11 (syst.) GeV/c2 (CMS+ATLAS)[4]
Mean lifetime1.56×10−22 s [Note 2] (predictit)
Decays intaebottom-antibottom pair (predictit)

twa W bosons (observed)
twa gluons (predictit)
tau-antitau pair (observed)
twa Z bosons (observed)
twa photons (observed)

various ither decays (predictit)
Electric chairge0 e
Colour chairge0
Spin0 (tentatively confirmed)[1]
Weak isospin-1/2
Weak hypercharge+1
Parity+1 (tentatively confirmed)[1]

The Higgs boson is an elementar pairticle in the Staundart Model o pairticle pheesics. It is the quantum excitation o the Higgs field,[6][7] a fundamental field o crucial importance tae pairticle pheesics theory[7] first suspectit tae exeest in the 1960s. Unlik ither kent fields such as the electromagnetic field, it haes a non-zero constant value in vacuum. The quaisten o the Higgs field's exeestence acame the last unverified pairt o the Staindart Model o pairticle pheesics, an for several decades wis conseedert "the central problem in pairticle pheesics".[8][9]

Notes[eedit | eedit soorce]

  1. Note that such events an aa occur due tae ither processes. Detection involves a stateestically signeeficant excess o such events at speceefic energies.
  2. In the Staundart Model, the tot decay width o a Higgs boson wi a mass o 126 GeV/c2 is predictit tae be 4.21×10−3 GeV.[5] The mean lifetime is gien bi .

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 O'Luanaigh, C. (14 March 2013). "New results indicate that new particle is a Higgs boson". CERN. Retrieved 2013-10-09.
  2. 2.0 2.1 Bryner, J. (14 March 2013). "Particle confirmed as Higgs boson". NBC News. Retrieved 2013-03-14.
  3. Heilprin, J. (14 Mairch 2013). "Higgs Boson Discovery Confirmed After Physicists Review Large Hadron Collider Data at CERN". The Huffington Post. Archived frae the oreeginal on 17 Mairch 2013. Retrieved 14 Mairch 2013. Unknown parameter |deadurl= ignored (help)
  4. ATLAS; CMS (26 March 2015). "Combined Measurement of the Higgs Boson Mass in pp Collisions at √s=7 and 8 TeV with the ATLAS and CMS Experiments". arXiv:1503.07589. 
  5. LHC Higgs Cross Section Working Group; Dittmaier; Mariotti; Passarino; Tanaka; Alekhin; Alwall; Bagnaschi; Banfi (2012). "Handbook of LHC Higgs Cross Sections: 2. Differential Distributions". CERN Report 2 (Tables A.1 – A.20). 1201: 3084. arXiv:1201.3084. Bibcode:2012arXiv1201.3084L.CS1 maint: ref=harv (link)
  6. Onyisi, P. (23 October 2012). "Higgs boson FAQ". University of Texas ATLAS group. Retrieved 2013-01-08.
  7. 7.0 7.1 Strassler, M. (12 October 2012). "The Higgs FAQ 2.0". ProfMattStrassler.com. Retrieved 2013-01-08. [Q] Why do particle physicists care so much about the Higgs particle?
    [A] Well, actually, they don’t. What they really care about is the Higgs field, because it is so important. [emphasis in original]
  8. José Luis Lucio; Arnulfo Zepeda (1987). Proceedings of the II Mexican School of Particles and Fields, Cuernavaca-Morelos, 1986. World Scientific. p. 29. ISBN 9971504340.
  9. Gunion, Dawson, Kane, and Haber (199). The Higgs Hunter's Guide (1st ed.). pp. 11 (?). ISBN 978-0-7867-4318-6.CS1 maint: multiple names: authors leet (link) – quoted as being in the first (1990) edition of the book by Peter Higgs in his talk "My Life as a Boson", 2001, ref#25.