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Hadronic τ Decays as New Physics Probes in the LHC Era

Cirigliano, Vincenzo ; Falkowski, Adam ; González-Alonso, Martín and Rodríguez-Sánchez, Antonio LU (2019) In Physical Review Letters 122(22).
Abstract

We analyze the sensitivity of hadronic τ decays to nonstandard interactions within the model-independent framework of the standard model effective field theory. Both exclusive and inclusive decays are studied, using the latest lattice data and QCD dispersion relations. We show that there are enough theoretically clean channels to disentangle all the effective couplings contributing to these decays, with the τ→ππντ channel representing an unexpected powerful new physics probe. We find that the ratios of nonstandard couplings to the Fermi constant are bound at the subpercent level. These bounds are complementary to the ones from electroweak precision observables and pp→τντ measurements at the LHC. The combination of τ decay and LHC data... (More)

We analyze the sensitivity of hadronic τ decays to nonstandard interactions within the model-independent framework of the standard model effective field theory. Both exclusive and inclusive decays are studied, using the latest lattice data and QCD dispersion relations. We show that there are enough theoretically clean channels to disentangle all the effective couplings contributing to these decays, with the τ→ππντ channel representing an unexpected powerful new physics probe. We find that the ratios of nonstandard couplings to the Fermi constant are bound at the subpercent level. These bounds are complementary to the ones from electroweak precision observables and pp→τντ measurements at the LHC. The combination of τ decay and LHC data puts tighter constraints on lepton universality violation in the gauge boson-lepton vertex corrections.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
122
issue
22
article number
221801
publisher
American Physical Society
external identifiers
  • scopus:85066932971
ISSN
0031-9007
DOI
10.1103/PhysRevLett.122.221801
language
English
LU publication?
yes
id
06695730-5ce1-4f6b-a7b6-d67cc7fde870
date added to LUP
2019-07-24 07:44:09
date last changed
2019-07-25 01:59:40
@article{06695730-5ce1-4f6b-a7b6-d67cc7fde870,
  abstract     = {<p>We analyze the sensitivity of hadronic τ decays to nonstandard interactions within the model-independent framework of the standard model effective field theory. Both exclusive and inclusive decays are studied, using the latest lattice data and QCD dispersion relations. We show that there are enough theoretically clean channels to disentangle all the effective couplings contributing to these decays, with the τ→ππντ channel representing an unexpected powerful new physics probe. We find that the ratios of nonstandard couplings to the Fermi constant are bound at the subpercent level. These bounds are complementary to the ones from electroweak precision observables and pp→τντ measurements at the LHC. The combination of τ decay and LHC data puts tighter constraints on lepton universality violation in the gauge boson-lepton vertex corrections.</p>},
  author       = {Cirigliano, Vincenzo and Falkowski, Adam and González-Alonso, Martín and Rodríguez-Sánchez, Antonio},
  issn         = {0031-9007},
  language     = {eng},
  month        = {06},
  number       = {22},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Hadronic τ Decays as New Physics Probes in the LHC Era},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.122.221801},
  doi          = {10.1103/PhysRevLett.122.221801},
  volume       = {122},
  year         = {2019},
}