Signatures of Light New Particles in $B\to K^{(*)} E_{\rm miss}$
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913711613018112 |
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| author | Bolton, Patrick D. Fajfer, Svjetlana Kamenik, Jernej F. Novoa-Brunet, Martín |
| author_facet | Bolton, Patrick D. Fajfer, Svjetlana Kamenik, Jernej F. Novoa-Brunet, Martín |
| contents | The recent Belle II observation of $B \to K E_{\rm miss}$ challenges theoretical interpretations in terms of Standard Model neutrino final states. Instead, we consider new physics scenarios where up to two new light-invisible particles of spin 0 up to 3/2 are present in the final state. We identify viable scenarios by reconstructing the (binned) likelihoods of the relevant $B \to K^{(*)} E_{\rm miss}$ and also $B_s \to E_{\rm miss}$ experimental analyses and present preferred regions of couplings and masses. In particular, we find that the current data prefers two-body decay kinematics involving the emission of a single massive scalar or a vector particle, or alternatively, three-body decays involving pairs of massive scalars or spin 1/2 fermions. When applicable, we compare our findings with existing literature and briefly discuss some model-building implications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_13887 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Signatures of Light New Particles in $B\to K^{(*)} E_{\rm miss}$ Bolton, Patrick D. Fajfer, Svjetlana Kamenik, Jernej F. Novoa-Brunet, Martín High Energy Physics - Phenomenology The recent Belle II observation of $B \to K E_{\rm miss}$ challenges theoretical interpretations in terms of Standard Model neutrino final states. Instead, we consider new physics scenarios where up to two new light-invisible particles of spin 0 up to 3/2 are present in the final state. We identify viable scenarios by reconstructing the (binned) likelihoods of the relevant $B \to K^{(*)} E_{\rm miss}$ and also $B_s \to E_{\rm miss}$ experimental analyses and present preferred regions of couplings and masses. In particular, we find that the current data prefers two-body decay kinematics involving the emission of a single massive scalar or a vector particle, or alternatively, three-body decays involving pairs of massive scalars or spin 1/2 fermions. When applicable, we compare our findings with existing literature and briefly discuss some model-building implications. |
| title | Signatures of Light New Particles in $B\to K^{(*)} E_{\rm miss}$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2403.13887 |