Delving into new physics in semileptonic $b \to c τ\bar ν$ transitions
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866912483211476992 |
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| author | Bhatta, Aishwarya Mohanta, Rukmani |
| author_facet | Bhatta, Aishwarya Mohanta, Rukmani |
| contents | Recently, several indications of lepton non-universality observables have been perceived in semileptonic $B$ meson decay processes, both in the neutral-current ($b \to s ll $) and charged-current ($b \to c l \bar ν_l$) transitions. Influenced by these fascinating quotients, we examine the semileptonic decays involving the $b \to c l \bar ν_l$ quark level transitions. We execute it through a model independent analysis in order to probe the nature of new physics. Taking into consideration the most general effective Hamiltonian, we scrutinize $Λ_b \to Λ_c τ\bar ν_τ$, $ B_c^+ \to η_c τ^+ ν_τ$, and $ B \to D^{**} τ\bar ν_τ$ (where $D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightest excited charm mesons) processes, in the presence of new physics. We perform a global fit to different sets of new coefficients, making use of the measurements on $R_{D}$, $R_{D^{*}}$, $R_{J/ψ}$, $P_τ^{D^*}$ and the upper limit on Br($B_c^+ \to τ^+ ν_τ$). We then inspect the effect of constrained new couplings on the branching ratios, forward-backward asymmetry parameters, lepton non-universality ratios (LNU), lepton and hadron polarization asymmetries of these decay modes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2207_08515 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Delving into new physics in semileptonic $b \to c τ\bar ν$ transitions Bhatta, Aishwarya Mohanta, Rukmani High Energy Physics - Phenomenology Recently, several indications of lepton non-universality observables have been perceived in semileptonic $B$ meson decay processes, both in the neutral-current ($b \to s ll $) and charged-current ($b \to c l \bar ν_l$) transitions. Influenced by these fascinating quotients, we examine the semileptonic decays involving the $b \to c l \bar ν_l$ quark level transitions. We execute it through a model independent analysis in order to probe the nature of new physics. Taking into consideration the most general effective Hamiltonian, we scrutinize $Λ_b \to Λ_c τ\bar ν_τ$, $ B_c^+ \to η_c τ^+ ν_τ$, and $ B \to D^{**} τ\bar ν_τ$ (where $D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightest excited charm mesons) processes, in the presence of new physics. We perform a global fit to different sets of new coefficients, making use of the measurements on $R_{D}$, $R_{D^{*}}$, $R_{J/ψ}$, $P_τ^{D^*}$ and the upper limit on Br($B_c^+ \to τ^+ ν_τ$). We then inspect the effect of constrained new couplings on the branching ratios, forward-backward asymmetry parameters, lepton non-universality ratios (LNU), lepton and hadron polarization asymmetries of these decay modes. |
| title | Delving into new physics in semileptonic $b \to c τ\bar ν$ transitions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2207.08515 |