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Author |
Filipuzzi, A.; Portoles, J.; Gonzalez-Alonso, M. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
U(2)^5 flavor symmetry and lepton universality violation in W -> tau(nu)over-bar(tau) |
Type |
Journal Article |
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Year |
2012 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
85 |
Issue |
11 |
Pages |
116010 - 10pp |
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Abstract |
The seeming violation of universality in the tau lepton coupling to the W boson suggested by LEP-II data is studied using an effective field theory (EFT) approach. Within this framework we explore how this feature fits into the current constraints from electroweak precision observables using different assumptions about the flavor structure of New Physics, namely [U(2) x U(1)](5) and U(2)(5). We show the importance of leptonic and semileptonic tau decay measurements, giving 3-4 TeV bounds on the New Physics effective scale at 90% C.L. We conclude under very general assumptions that it is not possible to accommodate this deviation from universality in the EFT framework, and thus such a signal could only be explained by the introduction of light degrees of freedom or New Physics strongly coupled at the electroweak scale. |
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Address |
[Filipuzzi, Alberto; Portoles, Jorge] CSIC Univ Valencia, IFIC, Dept Fis Teor, E-46071 Valencia, Spain |
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Publisher |
Amer Physical Soc |
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English |
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ISSN ![sorted by ISSN field, ascending order (up)](img/sort_asc.gif) |
1550-7998 |
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Notes |
WOS:000305680800020 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1074 |
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Author |
Gonzalez-Alonso, M.; Pich, A.; Rodriguez-Sanchez, A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Updated determination of chiral couplings and vacuum condensates from hadronic tau decay data |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
94 |
Issue |
1 |
Pages |
014017 - 14pp |
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Keywords |
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Abstract |
We analyze the lowest spectral moments of the left-right two-point correlation function, using all known short-distance constraints and the recently updated ALEPH V – A spectral function from tau decays. This information is used to determine the low-energy couplings L-10 and C-87 of chiral perturbation theory and the lowest-dimensional contributions to the operator product expansion of the left-right correlator. A detailed statistical analysis is implemented to assess the theoretical uncertainties, including violations of quark-hadron duality. |
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Address |
[Gonzalez-Alonso, Martin] CNRS, IPN Lyon, F-69622 Villeurbanne, France |
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Publisher |
Amer Physical Soc |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Edition |
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ISSN ![sorted by ISSN field, ascending order (up)](img/sort_asc.gif) |
2470-0010 |
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Conference |
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Notes |
WOS:000379653200003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2755 |
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Permanent link to this record |