Exploring the lepton flavor violating decay modes → in SMEFT approach

Dhiren Panda (School of Physics, University of Hyderabad, Hyderabad-500046, India) ; Manas Kumar Mohapatra (School of Physics, University of Hyderabad, Hyderabad-500046, India) ; Rukmani Mohanta (School of Physics, University of Hyderabad, Hyderabad-500046, India)

We perform an analysis of the consequences of various new physics operators on the lepton flavor violating (LFV) decay modes mediated through bs12 transitions. We scrutinize the imprints of the (pseudo)scalar and axial (vector) operators on the exclusive LFV decay channels B(s)(ϕ,K,K2)12 and ΛbΛ12, where 1,2 represent μ or τ. The new physics parameters are constrained by using the upper limits of the branching fractions of the Bsτμ and BKτμ processes, assuming the new physics couplings to be real. We then explore the key observables such as the branching fractions, the forward-backward asymmetries, and the longitudinal polarization fractions of the B(K,ϕ,K2)τ±μ decays. In addition, we also investigate the impact of the new physics couplings on the baryonic ΛbΛτ±μ decay channels mediated by the bs quark level transition. With the experimental prospects at LHCb upgrade and Belle II, we also predict the upper limits of the above-discussed observables, which could intrigue the new physics search in these channels.

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      "surname": "Mohapatra", 
      "email": "manasmohapatra12@gmail.com", 
      "full_name": "Mohapatra, Manas Kumar", 
      "given_names": "Manas Kumar"
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    {
      "surname": "Mohanta", 
      "given_names": "Rukmani", 
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          "country": "India", 
          "value": "School of Physics, University of Hyderabad, Hyderabad-500046, India"
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      "full_name": "Mohanta, Rukmani", 
      "orcid": "0000-0002-2207-7194", 
      "email": "rmsp@uohyd.ac.in"
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  "titles": [
    {
      "source": "Elsevier", 
      "title": "Exploring the lepton flavor violating decay modes \u2192 in SMEFT approach"
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      "source": "Elsevier", 
      "value": "We perform an analysis of the consequences of various new physics operators on the lepton flavor violating (LFV) decay modes mediated through <math><mi>b</mi><mo>\u2192</mo><mi>s</mi><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>1</mn></mrow></msub><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>2</mn></mrow></msub></math> transitions. We scrutinize the imprints of the (pseudo)scalar and axial (vector) operators on the exclusive LFV decay channels <math><msub><mrow><mi>B</mi></mrow><mrow><mo>(</mo><mi>s</mi><mo>)</mo></mrow></msub><mo>\u2192</mo><mo>(</mo><mi>\u03d5</mi><mo>,</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>\u204e</mo></mrow></msup><mo>,</mo><msubsup><mrow><mi>K</mi></mrow><mrow><mn>2</mn></mrow><mrow><mo>\u204e</mo></mrow></msubsup><mo>)</mo><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>1</mn></mrow></msub><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>2</mn></mrow></msub></math> and <math><msub><mrow><mi>\u039b</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>\u2192</mo><mi>\u039b</mi><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>1</mn></mrow></msub><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>2</mn></mrow></msub></math>, where <math><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>,</mo><msub><mrow><mi>\u2113</mi></mrow><mrow><mn>2</mn></mrow></msub></math> represent \u03bc or \u03c4. The new physics parameters are constrained by using the upper limits of the branching fractions of the <math><msub><mrow><mi>B</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>\u2192</mo><mi>\u03c4</mi><mi>\u03bc</mi></math> and <math><mi>B</mi><mo>\u2192</mo><mi>K</mi><mi>\u03c4</mi><mi>\u03bc</mi></math> processes, assuming the new physics couplings to be real. We then explore the key observables such as the branching fractions, the forward-backward asymmetries, and the longitudinal polarization fractions of the <math><mi>B</mi><mo>\u2192</mo><mo>(</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>\u204e</mo></mrow></msup><mo>,</mo><mi>\u03d5</mi><mo>,</mo><msubsup><mrow><mi>K</mi></mrow><mrow><mn>2</mn></mrow><mrow><mo>\u204e</mo></mrow></msubsup><mo>)</mo><msup><mrow><mi>\u03c4</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><msup><mrow><mi>\u03bc</mi></mrow><mrow><mo>\u2213</mo></mrow></msup></math> decays. In addition, we also investigate the impact of the new physics couplings on the baryonic <math><msub><mrow><mi>\u039b</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>\u2192</mo><mi>\u039b</mi><msup><mrow><mi>\u03c4</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><msup><mrow><mi>\u03bc</mi></mrow><mrow><mo>\u2213</mo></mrow></msup></math> decay channels mediated by the <math><mi>b</mi><mo>\u2192</mo><mi>s</mi></math> quark level transition. With the experimental prospects at LHCb upgrade and Belle II, we also predict the upper limits of the above-discussed observables, which could intrigue the new physics search in these channels."
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Published on:
17 October 2024
Publisher:
Elsevier
Published in:
Nuclear Physics B , Volume 1008 C (2024)

Article ID: 116720
DOI:
https://doi.org/10.1016/j.nuclphysb.2024.116720
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: