A new up-down flux ratio for sub-GeV atmospheric neutrinos enables Hyper-Kamiokande to measure the CP-violating phase with sensitivity surpassing T2HK near delta_CP of 90 and 270 degrees.
Electroweak Baryogenesis and Standard Model CP Violation
6 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We analyze the mechanism of electroweak baryogenesis proposed by Farrar and Shaposhnikov in which the phase of the CKM mixing matrix is the only source of $CP$ violation. This mechanism is based on a phase separation of baryons via the scattering of quasiparticles by the wall of an expanding bubble produced at the electroweak phase transition. In agreement with the recent work of Gavela, Hern\'andez, Orloff and P\`ene, we conclude that QCD damping effects reduce the asymmetry produced to a negligible amount. We interpret the damping as quantum decoherence. We compute the asymmetry analytically. Our analysis reflects the observation that only a thin, outer layer of the bubble contributes to the coherent scattering of the quasiparticles. The generality of our arguments rules out any mechanism of electroweak baryogenesis that does not make use of a new source of $CP$ violation.
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Non-thermal production via late-decaying reheatons can achieve the observed dark matter density for sexaquarks by controlling branching fractions and coalescence probabilities, unlike thermal freeze-out which underproduces them by many orders of magnitude.
First-order gradient CP-violating sources in EWBG quantum transport relax electron EDM bounds and increase viability compared to prior approximations in a model illustration.
Collapsing axion-like domain walls generate the baryon asymmetry by acting as an effective chemical potential through coupling to the electroweak topological term, with the asymmetry produced via sphaleron processes.
An ultralight scalar temporarily lowers a dark fermion mass via muon thermal density, opening efficient B meson dark decays for baryon asymmetry generation that later shuts off to match flavor data.
Global scans of complex 2HDM show Type-I models maximize gauge CPV near light-Higgs degeneracy with high eEDM, Type-II suppress gauge CPV but permit large Yukawa CPV and low eEDM via cancellations, plus hidden CPV in the alignment limit via heavy-Higgs mixing angle alpha3.
citing papers explorer
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Towards Measuring the CP-Violating Phase with Atmospheric Neutrinos
A new up-down flux ratio for sub-GeV atmospheric neutrinos enables Hyper-Kamiokande to measure the CP-violating phase with sensitivity surpassing T2HK near delta_CP of 90 and 270 degrees.
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Non-Thermal Production of Sexaquark Dark Matter
Non-thermal production via late-decaying reheatons can achieve the observed dark matter density for sexaquarks by controlling branching fractions and coalescence probabilities, unlike thermal freeze-out which underproduces them by many orders of magnitude.
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Does the Electron EDM Preclude Electroweak Baryogenesis ?
First-order gradient CP-violating sources in EWBG quantum transport relax electron EDM bounds and increase viability compared to prior approximations in a model illustration.
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Electroweak Baryogenesis from Collapsing Domain Walls
Collapsing axion-like domain walls generate the baryon asymmetry by acting as an effective chemical potential through coupling to the electroweak topological term, with the asymmetry produced via sphaleron processes.
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Mesogenesis through the Ephemeral Dark Decay of Beauty
An ultralight scalar temporarily lowers a dark fermion mass via muon thermal density, opening efficient B meson dark decays for baryon asymmetry generation that later shuts off to match flavor data.
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Intrinsic Properties of Large CP Violation in the Complex Two-Higgs-Doublet Model
Global scans of complex 2HDM show Type-I models maximize gauge CPV near light-Higgs degeneracy with high eEDM, Type-II suppress gauge CPV but permit large Yukawa CPV and low eEDM via cancellations, plus hidden CPV in the alignment limit via heavy-Higgs mixing angle alpha3.