Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays

A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, correspondi...

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Detalles Bibliográficos
Autores principales: Davoudiasl, Hooman, Lee, Hye-Sung, Marciano, William J.
Lenguaje:eng
Publicado: 2015
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.92.055005
http://cds.cern.ch/record/2030725
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author Davoudiasl, Hooman
Lee, Hye-Sung
Marciano, William J.
author_facet Davoudiasl, Hooman
Lee, Hye-Sung
Marciano, William J.
author_sort Davoudiasl, Hooman
collection CERN
description A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-20307252022-08-10T13:06:49Zdoi:10.1103/PhysRevD.92.055005http://cds.cern.ch/record/2030725engDavoudiasl, HoomanLee, Hye-SungMarciano, William J.Low Q^2 Weak Mixing Angle Measurements and Rare Higgs DecaysParticle Physics - PhenomenologyA weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years.A weighted average weak mixing angle θW derived from relatively low Q2 experiments is compared with the standard model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (∼10–35  GeV) “dark” Z boson Zd, corresponding to a U(1)d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z–Zd mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H→ZZd→4 charged leptons at the LHC. The sensitivity of future anticipated low Q2 measurements of sin2θW(Q2) to intermediate mass Zd is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC over the next few years.A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years.arXiv:1507.00352CERN-PH-TH-2015-151CERN-PH-TH-2015-151oai:cds.cern.ch:20307252015-07-01
spellingShingle Particle Physics - Phenomenology
Davoudiasl, Hooman
Lee, Hye-Sung
Marciano, William J.
Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title_full Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title_fullStr Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title_full_unstemmed Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title_short Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays
title_sort low q^2 weak mixing angle measurements and rare higgs decays
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.92.055005
http://cds.cern.ch/record/2030725
work_keys_str_mv AT davoudiaslhooman lowq2weakmixinganglemeasurementsandrarehiggsdecays
AT leehyesung lowq2weakmixinganglemeasurementsandrarehiggsdecays
AT marcianowilliamj lowq2weakmixinganglemeasurementsandrarehiggsdecays

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