Coloured Scalars Mediated Rare Charm Meson Decays to Invisible Fermions

Fajfer, Svjetlana; Novosel, Anja

doi:10.48550/arxiv.2101.10712

Cited by 3 publications

(3 citation statements)

References 30 publications

(56 reference statements)

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“…The studies [283][284][285] (see also [286][287][288][289]) have highlighted that hadrons could have rather large branching fractions into final states containing light dark baryons, which would appear as missing energy in a detector. It is quite remarkable that, in the light of current data, branching fractions as large as 1% for the neutron and 0.5% for the B meson are allowed if the decays occur into states in the dark sector which carry baryon number.…”

Section: Kaon Decay Modelmentioning

confidence: 99%

New physics searches at kaon and hyperon factories

et al. 2023

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Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths and the availability of very large datasets. On the other hand, useful complementary information is provided by hyperon decay measurements. We summarize the relevant phenomenological models and the status of the searches in a comprehensive list of kaon and hyperon decay channels. We identify new search strategies for under-explored signatures, and demonstrate that the improved sensitivities from current and next-generation experiments could lead to a qualitative leap in the exploration of light dark sectors.

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Section: Kaon Decay Modelmentioning

confidence: 99%

New physics searches at kaon and hyperon factories

et al. 2023

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show abstract

“…The studies [268][269][270] (see also [271][272][273][274]) have highlighted that hadrons could have rather large branching fractions into final states containing light dark baryons, which would appear as missing energy in a detector. It is quite remarkable that, in the light of current data, branching fractions as large as 1% for the neutron and 0.5% for the B meson are allowed if the decays occur into states in the dark sector which carry baryon number.…”

Section: Modelmentioning

confidence: 99%

New Physics Searches at Kaon and Hyperon Factories

Goudzovski¹,

Redigolo²,

Tobioka³

et al. 2022

Preprint

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Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths and the availability of very large datasets. On the other hand, useful complementary information is provided by hyperon decay measurements. We summarize the relevant phenomenological models and the status of the searches in a comprehensive list of kaon and hyperon decay channels. We identify new search strategies for under-explored signatures, and demonstrate that the improved sensitivities from current and nextgeneration experiments could lead to a qualitative leap in the exploration of light dark sectors.

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“…As for the charm sector, a few studies have analyzed the FCNC dineutrino modes in the SM and BSM frameworks [21][22][23][24]. Here, we focus on B c → B ( * )+ ν ν decays, for which lattice QCD results for the hadronic form factors can be used, with a control of the theoretical uncertainty related to nonperturbative QCD quantities.…”

Section: Introductionmentioning

confidence: 99%

$c \to u ν{\bar ν}$ transitions of $B_c$ mesons: 331 model facing Standard Model null tests

Colangelo,

De Fazio,

Loparco

2021

Preprint

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The Glashow-Iliopoulos-Maiani mechanism is extremely efficient to suppress the flavour-changing neutral current decays of charmed hadrons induced by the c → u transitions, making such processes particularly sensitive to phenomena beyond the Standard Model. In particular, c → u decays with a neutrino pair in the final state are theoretically appealing due to the small long-distance contributions. Moreover, in the framework of the Standard Model Effective Field Theory (SMEFT), the SU (2) L invariance allows to relate the Wilson coefficients in the effective Hamiltonian governing the c → uν ν decays to the coefficients in the c → u + − Hamiltonian. We analyze the B c → B ( * )+ ν ν decays, for which branching fractions of at most O(10 −16 ) are predicted in the Standard Model including short-and long-distance contributions, so small that they can be considered as null tests. Using SMEFT and the relation to the c → u + − processes we study the largest enhancement achievable in generic new physics scenarios. Then we focus on a particular extension of the Standard Model, the 331 model. SMEFT relations and the connection with c → u + − imply that B(B c → B ( * )+ ν ν) could even reach O(10 −6 ), an extremely large enhancement. A less pronounced effect is found in the 331 model, with O(10 −11 ) predicted branching fractions. Within the 331 model correlations exist among the B c → B ( * )+ ν ν and K → πν ν, B → (X s , K, K * )ν ν channels.

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Coloured Scalars Mediated Rare Charm Meson Decays to Invisible Fermions

Cited by 3 publications

References 30 publications

New physics searches at kaon and hyperon factories

New physics searches at kaon and hyperon factories

New Physics Searches at Kaon and Hyperon Factories

$c \to u ν{\bar ν}$ transitions of $B_c$ mesons: 331 model facing Standard Model null tests

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