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- W3204285622 abstract "A bstract We analyze rare charm baryon decays within the standard model and beyond. We identify all null test observables in unpolarized Λ c → pℓ + ℓ − , ℓ = e, μ decays, and study the new physics sensitivities. We find that the longitudinal dilepton polarization fraction F L is sensitive to electromagnetic dipole couplings $$ {C}_7^{left(prime right)} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mi>C</mml:mi> <mml:mn>7</mml:mn> <mml:mfenced> <mml:mo>′</mml:mo> </mml:mfenced> </mml:msubsup> </mml:math> , and to the right-handed 4-fermion vector coupling $$ {C}_9^{left(prime right)} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mi>C</mml:mi> <mml:mn>9</mml:mn> <mml:mfenced> <mml:mo>′</mml:mo> </mml:mfenced> </mml:msubsup> </mml:math> . The forward-backward asymmetry, A FB , due to the GIM-suppression a standard model null test already, probes the left-handed axialvector 4-fermion coupling C 10 ; its CP–asymmetry, $$ {A}_{mathrm{FB}}^{mathrm{CP}} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>FB</mml:mi> <mml:mi>CP</mml:mi> </mml:msubsup> </mml:math> probes CP-violating phases in C 10 . Physics beyond the standard model can induce branching ratios of dineutrino modes Λ c → pν $$ overline{nu} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> up to a few times 10 − 5 , and one order of magnitude smaller if lepton flavor universality is assumed, while standard model rates are negligible. Charged lepton flavor violation allows for striking signals into e ± μ ∓ final states, up to 10 − 6 branching ratios model-independently, and up to order 10 − 8 in leptoquark models. Related three-body baryon decays Ξ c → Σ ℓℓ , Ξ c → Λ ℓℓ and Ω c → Ξ ℓℓ offer similar opportunities to test the standard model with | ∆ c| = | ∆ u| = 1 transitions." @default.
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- W3204285622 date "2021-09-01" @default.
- W3204285622 modified "2023-10-15" @default.
- W3204285622 title "Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays" @default.
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- W3204285622 doi "https://doi.org/10.1007/jhep09(2021)208" @default.
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