Unraveling New Physics Effects in $b \rightarrow s \ell_1 \ell_2$ Transitions with a Model-Independent Perspective
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| Format: | Preprint |
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2025
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| _version_ | 1866910932795392000 |
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| author | Bhatta, Aishwarya Panda, Dhiren Mohanta, Rukmani |
| author_facet | Bhatta, Aishwarya Panda, Dhiren Mohanta, Rukmani |
| contents | Motivated by recent anomalies in observables associated with flavor-changing neutral current (FCNC) transitions, specifically $b \rightarrow s \ell^+ \ell^-$ processes, we present a comprehensive analysis of lepton flavor-violating (LFV) decay modes mediated by $b \rightarrow s \ell_1 \ell_2$ transitions with $\ell_1 \neq \ell_2$. While such LFV processes are forbidden within the Standard Model (SM), they naturally arise in several of its extensions, including models featuring additional vector-like fermions and extra $Z'$ bosons. Employing the most general effective Hamiltonian for $b \rightarrow s \ell_1 \ell_2$ transitions, we derive the angular distributions of the relevant decay modes. Adopting a model-independent framework, we systematically study the LFV decays $B \rightarrow K^* \ell_1 \ell_2$, $B_s \rightarrow ϕ\ell_1 \ell_2$, $B \rightarrow K_2^* \ell_1 \ell_2$, and $Λ_b \rightarrow Λ\ell_1 \ell_2$. Although LFV mesonic decays have been widely explored, the corresponding baryonic decays remain comparatively under-investigated. We provide bounds on branching ratio ($\mathcal{B}$), forward-backward asymmetry ($\mathcal{A}_{FB}$), and longitudinal lepton polarization fraction ($\mathcal{F}_L$). Furthermore, considering the projected sensitivities of the LHCb upgrade and Belle II experiments, we estimate upper limits for these observables, offering promising avenues for probing new physics in these LFV channels. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_05125 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unraveling New Physics Effects in $b \rightarrow s \ell_1 \ell_2$ Transitions with a Model-Independent Perspective Bhatta, Aishwarya Panda, Dhiren Mohanta, Rukmani High Energy Physics - Phenomenology Motivated by recent anomalies in observables associated with flavor-changing neutral current (FCNC) transitions, specifically $b \rightarrow s \ell^+ \ell^-$ processes, we present a comprehensive analysis of lepton flavor-violating (LFV) decay modes mediated by $b \rightarrow s \ell_1 \ell_2$ transitions with $\ell_1 \neq \ell_2$. While such LFV processes are forbidden within the Standard Model (SM), they naturally arise in several of its extensions, including models featuring additional vector-like fermions and extra $Z'$ bosons. Employing the most general effective Hamiltonian for $b \rightarrow s \ell_1 \ell_2$ transitions, we derive the angular distributions of the relevant decay modes. Adopting a model-independent framework, we systematically study the LFV decays $B \rightarrow K^* \ell_1 \ell_2$, $B_s \rightarrow ϕ\ell_1 \ell_2$, $B \rightarrow K_2^* \ell_1 \ell_2$, and $Λ_b \rightarrow Λ\ell_1 \ell_2$. Although LFV mesonic decays have been widely explored, the corresponding baryonic decays remain comparatively under-investigated. We provide bounds on branching ratio ($\mathcal{B}$), forward-backward asymmetry ($\mathcal{A}_{FB}$), and longitudinal lepton polarization fraction ($\mathcal{F}_L$). Furthermore, considering the projected sensitivities of the LHCb upgrade and Belle II experiments, we estimate upper limits for these observables, offering promising avenues for probing new physics in these LFV channels. |
| title | Unraveling New Physics Effects in $b \rightarrow s \ell_1 \ell_2$ Transitions with a Model-Independent Perspective |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.05125 |