Lepton-flavor-violating semileptonic Decay and

Xiao-Gang He (Tsung-Dao Lee Institute, School of Physics and Astronomy, SKLPPC, Shanghai Jiao Tong University, Shanghai, China; Department of Physics, National Taiwan University, Taipei, Taiwan; Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan) ; Jusak Tandean (Department of Physics, National Taiwan University, Taipei, Taiwan; Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan) ; German Valencia (School of Physics and Astronomy, Monash University, Melbourne, Australia)

We consider lepton-flavor violation in strangeness changing (|ΔS|=1) semileptonic τ-lepton decays arising from new physics encoded in a standard model effective Lagrangian. Its invariance under the standard model gauge group entails the relevance of other processes which can serve as complementary probes of the new physics operators. We show in particular that for some of them the bounds implied by current data on the rare kaon decays involving a neutrino pair, Kπνν¯, are stronger than the existing limits from direct searches for lepton-flavor-violating semileptonic τ decays. We discuss additional processes affected by the same operators and find that certain leptonic charged-meson decays also provide stricter constraints on a few more of them. Upcoming results of ongoing experiments such as Belle II and NA62 will further test the new physics parameter space.

{
  "license": [
    {
      "url": "http://creativecommons.org/licenses/by/3.0/", 
      "license": "CC-BY-3.0"
    }
  ], 
  "copyright": [
    {
      "holder": "The Author(s)", 
      "statement": "The Author(s)", 
      "year": "2019"
    }
  ], 
  "control_number": "49064", 
  "_oai": {
    "updated": "2019-10-15T19:17:01Z", 
    "id": "oai:repo.scoap3.org:49064", 
    "sets": [
      "PLB"
    ]
  }, 
  "authors": [
    {
      "affiliations": [
        {
          "country": "China", 
          "value": "Tsung-Dao Lee Institute, School of Physics and Astronomy, SKLPPC, Shanghai Jiao Tong University, Shanghai, China"
        }, 
        {
          "country": "Taiwan", 
          "value": "Department of Physics, National Taiwan University, Taipei, Taiwan"
        }, 
        {
          "country": "Taiwan", 
          "value": "Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan"
        }
      ], 
      "surname": "He", 
      "email": "hexg@phys.ntu.edu.tw", 
      "full_name": "He, Xiao-Gang", 
      "given_names": "Xiao-Gang"
    }, 
    {
      "surname": "Tandean", 
      "given_names": "Jusak", 
      "affiliations": [
        {
          "country": "Taiwan", 
          "value": "Department of Physics, National Taiwan University, Taipei, Taiwan"
        }, 
        {
          "country": "Taiwan", 
          "value": "Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan"
        }
      ], 
      "full_name": "Tandean, Jusak", 
      "orcid": "0000-0001-7581-2351", 
      "email": "jtandean@phys.ntu.edu.tw"
    }, 
    {
      "surname": "Valencia", 
      "given_names": "German", 
      "affiliations": [
        {
          "country": "Australia", 
          "value": "School of Physics and Astronomy, Monash University, Melbourne, Australia"
        }
      ], 
      "full_name": "Valencia, German", 
      "orcid": "0000-0001-6600-1290", 
      "email": "german.valencia@monash.edu"
    }
  ], 
  "_files": [
    {
      "checksum": "md5:c79b63a4b07e5892238e40a09aadeb9f", 
      "filetype": "xml", 
      "bucket": "d0b60ab2-c99d-434a-ae87-be729d395886", 
      "version_id": "3ff39ef4-dbaf-4811-9855-268fbc9650f3", 
      "key": "10.1016/j.physletb.2019.134842.xml", 
      "size": 265979
    }, 
    {
      "checksum": "md5:b094646ee1f1c1bb0da117f979dab48f", 
      "filetype": "pdf", 
      "bucket": "d0b60ab2-c99d-434a-ae87-be729d395886", 
      "version_id": "06211ca8-81c8-4d48-9849-8b9449c38acb", 
      "key": "10.1016/j.physletb.2019.134842.pdf", 
      "size": 357873
    }, 
    {
      "checksum": "md5:89bca9eecd7410396f5665a0d2957ba9", 
      "filetype": "pdf/a", 
      "bucket": "d0b60ab2-c99d-434a-ae87-be729d395886", 
      "version_id": "1a2346be-ce82-4966-a0ea-0f83ecc7d9a1", 
      "key": "10.1016/j.physletb.2019.134842_a.pdf", 
      "size": 690095
    }
  ], 
  "record_creation_date": "2019-08-09T14:30:22.879696", 
  "titles": [
    {
      "source": "Elsevier", 
      "title": "Lepton-flavor-violating semileptonic Decay and"
    }
  ], 
  "collections": [
    {
      "primary": "Physics Letters B"
    }
  ], 
  "dois": [
    {
      "value": "10.1016/j.physletb.2019.134842"
    }
  ], 
  "publication_info": [
    {
      "journal_volume": "797 C", 
      "journal_title": "Physics Letters B", 
      "material": "article", 
      "artid": "134842", 
      "year": 2019
    }
  ], 
  "$schema": "http://repo.scoap3.org/schemas/hep.json", 
  "abstracts": [
    {
      "source": "Elsevier", 
      "value": "We consider lepton-flavor violation in strangeness changing (<math><mo>|</mo><mi>\u0394</mi><mi>S</mi><mo>|</mo><mo>=</mo><mn>1</mn></math>) semileptonic \u03c4-lepton decays arising from new physics encoded in a standard model effective Lagrangian. Its invariance under the standard model gauge group entails the relevance of other processes which can serve as complementary probes of the new physics operators. We show in particular that for some of them the bounds implied by current data on the rare kaon decays involving a neutrino pair, <math><mi>K</mi><mo>\u2192</mo><mi>\u03c0</mi><mi>\u03bd</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math>, are stronger than the existing limits from direct searches for lepton-flavor-violating semileptonic \u03c4 decays. We discuss additional processes affected by the same operators and find that certain leptonic charged-meson decays also provide stricter constraints on a few more of them. Upcoming results of ongoing experiments such as Belle II and NA62 will further test the new physics parameter space."
    }
  ], 
  "imprints": [
    {
      "date": "2019-08-09", 
      "publisher": "Elsevier"
    }
  ], 
  "acquisition_source": {
    "date": "2019-10-15T20:31:08.013196", 
    "source": "Elsevier", 
    "method": "Elsevier", 
    "submission_number": "cbdd69f2ef7911e981ff02163e01809a"
  }
}
Published on:
09 August 2019
Publisher:
Elsevier
Published in:
Physics Letters B , Volume 797 C (2019)

Article ID: 134842
DOI:
https://doi.org/10.1016/j.physletb.2019.134842
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: