publication . Article . Other literature type . Preprint . 2019

Hadronic τ Decays as New Physics Probes in the LHC Era

Vincenzo Cirigliano; Adam Falkowski; Martín González-Alonso; Antonio Rodríguez-Sánchez;
Open Access English
  • Published: 07 Jun 2019 Journal: Physical Review Letters, volume 122, issue 22 (issn: 0031-9007, eissn: 1079-7114, Copyright policy)
  • Publisher: HAL CCSD
We analyze the sensitivity of hadronic tau decays to non-standard interactions within the model-independent framework of the Standard Model Effective Field Theory (SMEFT). 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 $\tau \to \pi\pi\nu_\tau$ channel representing an unexpected powerful New Physics probe. We find that the ratios of non-standard couplings to the Fermi constant are bound at the sub-percent level. These bounds are complementary to the ones from ele...
Persistent Identifiers
arXiv: High Energy Physics::PhenomenologyHigh Energy Physics::Experiment
free text keywords: Elementary Particles and Fields, data analysis method, tau --> pi pi neutrino/tau, dispersion relation, lattice field theory, sensitivity, effective field theory, quantum chromodynamics, electroweak interaction, new physics, CERN LHC Coll, weak interaction: coupling constant, correction: vertex, lepton: universality: violation, tau: hadronic decay, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], General Physics and Astronomy, hep-ph, Particle Physics - Phenomenology, High Energy Physics - Phenomenology, Lepton, Large Hadron Collider, Physics, Physics beyond the Standard Model, Particle physics, Standard Model
Funded by
The Elusives Enterprise: Asymmetries of the Invisible Universe
  • Funder: European Commission (EC)
  • Project Code: 674896
  • Funding stream: H2020 | MSCA-ITN-ETN
EC| InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
EC| MorePheno
Collider Phenomenology and Event Generators
  • Funder: European Commission (EC)
  • Project Code: 668679
  • Funding stream: H2020 | ERC | ERC-ADG
Validated by funder
Closing in on New Physics in light-quark flavour transitions: from tau decays to the LHC
  • Funder: European Commission (EC)
  • Project Code: 745954
  • Funding stream: H2020 | MSCA-IF-EF-ST
Validated by funder
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[14] We have not included right-handed (and wrong-flavor) neutrino fields [15], which, in any case, do not interfere with the SM amplitude and, thus, contribute at Oðϵi2Þ to the observables.

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