$R_{D^{(*)}}$ and survival of the fittest scalar leptoquark
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| Format: | Preprint |
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2024
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| _version_ | 1866909332004667392 |
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| author | Bečirević, Damir Fajfer, Svjetlana Košnik, Nejc Pavičić, Lovre |
| author_facet | Bečirević, Damir Fajfer, Svjetlana Košnik, Nejc Pavičić, Lovre |
| contents | Motivated by the long-standing discrepancy in lepton flavor universality ratios $R_D$ and $R_{D^{\ast}}$ we assess the status of scalar leptoquark states $R_2$, $\widetilde R_2$ and $S_1$ which can in principle provide a desired enhancement of $\mathcal{B}(B\to D^{(\ast )}τν)$ in a minimal setup with two Yukawa couplings only. We consider unavoidable low-energy constraints, $Z$-pole measurements as well as high-$p_T$ constraints. After setting mass of each leptoquark to $1.5$ TeV we find that of all considered states only $S_1$ leptoquark, coupled to both chiralities of leptons and quarks, is still a completely viable solution while the scenario with $R_2$ is in growing tension with $Γ(Z \to ττ)$ and with the LHC constraints on the di-tau tails at high-$p_T$. We comment on the future experimental tests of $S_1$ scenario. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_16772 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $R_{D^{(*)}}$ and survival of the fittest scalar leptoquark Bečirević, Damir Fajfer, Svjetlana Košnik, Nejc Pavičić, Lovre High Energy Physics - Phenomenology Motivated by the long-standing discrepancy in lepton flavor universality ratios $R_D$ and $R_{D^{\ast}}$ we assess the status of scalar leptoquark states $R_2$, $\widetilde R_2$ and $S_1$ which can in principle provide a desired enhancement of $\mathcal{B}(B\to D^{(\ast )}τν)$ in a minimal setup with two Yukawa couplings only. We consider unavoidable low-energy constraints, $Z$-pole measurements as well as high-$p_T$ constraints. After setting mass of each leptoquark to $1.5$ TeV we find that of all considered states only $S_1$ leptoquark, coupled to both chiralities of leptons and quarks, is still a completely viable solution while the scenario with $R_2$ is in growing tension with $Γ(Z \to ττ)$ and with the LHC constraints on the di-tau tails at high-$p_T$. We comment on the future experimental tests of $S_1$ scenario. |
| title | $R_{D^{(*)}}$ and survival of the fittest scalar leptoquark |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.16772 |