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Title: Hadronic tau decays as new physics probes in the LHC era

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 → ππν τ 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 → τν τ 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.

Authors:
ORCiD logo [1];  [2];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. Paris-Sud, Orsay (France)
  3. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  4. Lund Univ. (Sweden); Spanish National Research Council (CSIC), Valencia (Spain). Univ. of Valencia (UV), Inst. de Fisica Corpuscular
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1544722
Report Number(s):
LA-UR-18-27408
Journal ID: ISSN 0031-9007; 1079-7114 (Electronic)
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic; Nuclear and Particle Physics

Citation Formats

Cirigliano, Vincenzo, Falkowski, Adam, Gonzalez-Alonso, Martin, and Rodriguez-Sanchez, Antonio. Hadronic tau decays as new physics probes in the LHC era. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.221801.
Cirigliano, Vincenzo, Falkowski, Adam, Gonzalez-Alonso, Martin, & Rodriguez-Sanchez, Antonio. Hadronic tau decays as new physics probes in the LHC era. United States. doi:10.1103/PhysRevLett.122.221801.
Cirigliano, Vincenzo, Falkowski, Adam, Gonzalez-Alonso, Martin, and Rodriguez-Sanchez, Antonio. Fri . "Hadronic tau decays as new physics probes in the LHC era". United States. doi:10.1103/PhysRevLett.122.221801. https://www.osti.gov/servlets/purl/1544722.
@article{osti_1544722,
title = {Hadronic tau decays as new physics probes in the LHC era},
author = {Cirigliano, Vincenzo and Falkowski, Adam and Gonzalez-Alonso, Martin and Rodriguez-Sanchez, Antonio},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.122.221801},
journal = {Physical Review Letters},
number = 22,
volume = 122,
place = {United States},
year = {2019},
month = {6}
}

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