Impact of → Measurements on Decay in Leptoquark Model

Shabana Khan (Department of Physics, University of Rajasthan, Jaipur, India) ; Neetu Raj Singh Chundawat (Indian Institute of Technology Jodhpur, Jodhpur, India) ; Dinesh Kumar (Department of Physics, University of Rajasthan, Jaipur, India)

The measurements of several lepton flavor universality (LFU) violating observables in the decays induced by the quark level transition bcτν¯ provide an inkling of plausible physics beyond the standard model of electroweak interactions. Such new physics would also impact other sectors. In this work, we estimate the leverage of new physics in bcτν¯ on Λbpτν¯ decay in the context of U1 leptoquark model. In this model, the new physics couplings in buτν¯ transition can be written in terms of bcτν¯ couplings and hence the extent of allowed new physics in Λbpτν¯ would be determined by bcτν¯ transition. Using the new physics parameter space obtained by performing a fit to all bcτν¯ data, we obtain predictions of several Λbpτν¯ observables. We find that the current bcτν¯ data allows two times of magnitude enhancement in the branching ratio as well as in the LFU ratio. The other observables such as convexity parameter, lepton forward-backward asymmetry, longitudinal polarization of final state baryon and tau lepton are consistent with the SM value.

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      "source": "Elsevier", 
      "title": "Impact of \u2192 Measurements on Decay in Leptoquark Model"
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  "abstracts": [
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      "source": "Elsevier", 
      "value": "The measurements of several lepton flavor universality (LFU) violating observables in the decays induced by the quark level transition <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> provide an inkling of plausible physics beyond the standard model of electroweak interactions. Such new physics would also impact other sectors. In this work, we estimate the leverage of new physics in <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> on <math><msub><mrow><mi>\u039b</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>\u2192</mo><mi>p</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> decay in the context of <math><msub><mrow><mi>U</mi></mrow><mrow><mn>1</mn></mrow></msub></math> leptoquark model. In this model, the new physics couplings in <math><mi>b</mi><mo>\u2192</mo><mi>u</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> transition can be written in terms of <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> couplings and hence the extent of allowed new physics in <math><msub><mrow><mi>\u039b</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>\u2192</mo><mi>p</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> would be determined by <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> transition. Using the new physics parameter space obtained by performing a fit to all <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> data, we obtain predictions of several <math><msub><mrow><mi>\u039b</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>\u2192</mo><mi>p</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> observables. We find that the current <math><mi>b</mi><mo>\u2192</mo><mi>c</mi><mi>\u03c4</mi><mover><mrow><mi>\u03bd</mi></mrow><mrow><mo>\u00af</mo></mrow></mover></math> data allows two times of magnitude enhancement in the branching ratio as well as in the LFU ratio. The other observables such as convexity parameter, lepton forward-backward asymmetry, longitudinal polarization of final state baryon and tau lepton are consistent with the SM value."
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Published on:
23 May 2023
Publisher:
Elsevier
Published in:
Nuclear Physics B , Volume 991 C (2023)

Article ID: 116211
DOI:
https://doi.org/10.1016/j.nuclphysb.2023.116211
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: