Evidence for the spin-0 nature of the Higgs boson using ATLAS data

Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton–proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin–parity <math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mro...

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Autores principales: Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín F., The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Exactas
spin-0 nature
Higgs boson
ATLAS data
Física
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/77572
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-77572
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
spin-0 nature
Higgs boson
ATLAS data
Física
spellingShingle Ciencias Exactas
spin-0 nature
Higgs boson
ATLAS data
Física
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
Evidence for the spin-0 nature of the Higgs boson using ATLAS data
topic_facet Ciencias Exactas
spin-0 nature
Higgs boson
ATLAS data
Física
description Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton–proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin–parity <math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mrow is="true"><mi is="true">J</mi></mrow><mrow is="true"><mi is="true">P</mi></mrow></msup><mo is="true">=</mo><msup is="true"><mrow is="true"><mn is="true">0</mn></mrow><mrow is="true"><mo is="true">+</mo></mrow></msup></math> hypothesis is compared with alternative hypotheses using the Higgs boson decays H→ γγ, <math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">H</mi><mo is="true">→</mo><mi is="true">Z</mi><msup is="true"><mrow is="true"><mi is="true">Z</mi></mrow><mrow is="true"><mo is="true">⁎</mo></mrow></msup><mo is="true">→</mo><mn is="true">4</mn><mi is="true">ℓ</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">H</mi><mo is="true">→</mo><mi is="true">W</mi><msup is="true"><mrow is="true"><mi is="true">W</mi></mrow><mrow is="true"><mo is="true">⁎</mo></mrow></msup><mo is="true">→</mo><mi is="true">ℓ</mi><mi is="true">ν</mi><mi is="true">ℓ</mi><mi is="true">ν</mi></math>, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb−1 collected at a centre–of–mass energy of √ s = 8 TeV. For the <math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">H</mi><mo is="true">→</mo><mi is="true">Z</mi><msup is="true"><mrow is="true"><mi is="true">Z</mi></mrow><mrow is="true"><mo is="true">⁎</mo></mrow></msup><mo is="true">→</mo><mn is="true">4</mn><mi is="true">ℓ</mi></math> decay mode the dataset corresponding to an integrated luminosity of 4.6 fb−1 collected at √ s = 7 TeV is added. The data are compatible with the Standard Model <math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mrow is="true"><mi is="true">J</mi></mrow><mrow is="true"><mi is="true">P</mi></mrow></msup><mo is="true">=</mo><msup is="true"><mrow is="true"><mn is="true">0</mn></mrow><mrow is="true"><mo is="true">+</mo></mrow></msup></math> quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this letter, namely some specific <math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mrow is="true"><mi is="true">J</mi></mrow><mrow is="true"><mi is="true">P</mi></mrow></msup><mo is="true">=</mo><msup is="true"><mrow is="true"><mn is="true">0</mn></mrow><mrow is="true"><mo is="true">−</mo></mrow></msup><mo is="true">,</mo><msup is="true"><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mo is="true">+</mo></mrow></msup><mo is="true">,</mo><msup is="true"><mrow is="true"><mn is="true">1</mn></mrow><mrow is="true"><mo is="true">−</mo></mrow></msup><mo is="true">,</mo><msup is="true"><mrow is="true"><mn is="true">2</mn></mrow><mrow is="true"><mo is="true">+</mo></mrow></msup></math> models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the <math xmlns="http://www.w3.org/1998/Math/MathML"><msup is="true"><mrow is="true"><mi is="true">J</mi></mrow><mrow is="true"><mi is="true">P</mi></mrow></msup><mo is="true">=</mo><msup is="true"><mrow is="true"><mn is="true">2</mn></mrow><mrow is="true"><mo is="true">+</mo></mrow></msup></math> model, of the relative fractions of gluon–fusion and quark–antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred.
format Articulo
Articulo
author Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_facet Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín F.
The ATLAS Collaboration
author_sort Anduaga, Xabier Sebastián
title Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_short Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_full Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_fullStr Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_full_unstemmed Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_sort evidence for the spin-0 nature of the higgs boson using atlas data
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/77572
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