Baryogenesis and Dark Matter from B Mesons

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• Miguel Escudero (King's College, London)
• Thursday 09 May 2019, 16:00-17:00
• Ryle Seminar Room no. 930, Rutherford Building, Cavendish Laboratory.

If you have a question about this talk, please contact Joseph Davighi.

In this talk, based on arXiv:1810.00880, I will present a new mechanism of Baryogenesis and dark matter production in which both the dark matter relic abundance and the baryon asymmetry arise from neutral B meson oscillations and subsequent decays.

In the early Universe, decays of a long lived particle produce B mesons and anti-mesons out of thermal equilibrium. These mesons/anti-mesons then undergo CP violating oscillations before quickly decaying into visible and dark sector particles. Dark matter will be charged under Baryon number so that the visible sector baryon asymmetry is produced without violating the total baryon number of the Universe. The produced baryon asymmetry will be directly related to the leptonic charge asymmetry in neutral B decays; an experimental observable. Dark matter is stabilized by an unbroken discrete symmetry, and proton decay is simply evaded by kinematics.

If this mechanism is the responsible one for generating the observed baryon asymmetry and dark matter abundance we observe today, it would lead to distinctive experimental signatures:

1) a large branching fraction of B mesons into a baryon and missing energy (> 10^-4)

2) a positive semileptonic asymmetry in neutral B meson decays (> 10^-5)

3) a large branching fraction of b-flavored Baryons into mesons and missing energy (> 10^-4)

These unique collider signatures are testable at current collider experiments, like the LHC and Belle-II, allowing for a distinct probe of this mechanism.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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