Exploring observable effects of scalar operators beyond SMEFT in the angular distribution of $B\to K^{*0} τ^+ τ^- $
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866914921498804224 |
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| author | Karmakar, Siddhartha Dighe, Amol |
| author_facet | Karmakar, Siddhartha Dighe, Amol |
| contents | The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field Theory (SMEFT) imposes relations among different low-energy effective field theory Wilson coefficients (WCs), any deviations from which would signal the presence of physics beyond SMEFT. In this work, we investigate two such relations ($C_S = -C_P$, $C_S^\prime = C_P^\prime$) among the scalar and the pseudoscalar new-physics WCs that can contribute to $b\to s \,ττ$ processes. We show that, even when new physics violating these relations would not be measurable in the branching ratios of $B_s \to τ^+ τ^-$ and $B\to K^{(*)}\,τ^+ τ^-$ at HL-LHC and FCC-ee, it can still manifest itself in the angular distribution of $B\to K^{*0}\,τ^+ τ^-$. We identify the combinations of angular observables in this decay channel that are sensitive to scenarios beyond SMEFT. We find that the two observables $S_6^c$ and $A_7$, and their combination, have the potential to identify physics beyond SMEFT. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13069 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring observable effects of scalar operators beyond SMEFT in the angular distribution of $B\to K^{*0} τ^+ τ^- $ Karmakar, Siddhartha Dighe, Amol High Energy Physics - Phenomenology The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field Theory (SMEFT) imposes relations among different low-energy effective field theory Wilson coefficients (WCs), any deviations from which would signal the presence of physics beyond SMEFT. In this work, we investigate two such relations ($C_S = -C_P$, $C_S^\prime = C_P^\prime$) among the scalar and the pseudoscalar new-physics WCs that can contribute to $b\to s \,ττ$ processes. We show that, even when new physics violating these relations would not be measurable in the branching ratios of $B_s \to τ^+ τ^-$ and $B\to K^{(*)}\,τ^+ τ^-$ at HL-LHC and FCC-ee, it can still manifest itself in the angular distribution of $B\to K^{*0}\,τ^+ τ^-$. We identify the combinations of angular observables in this decay channel that are sensitive to scenarios beyond SMEFT. We find that the two observables $S_6^c$ and $A_7$, and their combination, have the potential to identify physics beyond SMEFT. |
| title | Exploring observable effects of scalar operators beyond SMEFT in the angular distribution of $B\to K^{*0} τ^+ τ^- $ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2408.13069 |