Introductory talk on Beyond the Standard Models of Particle Physics - PowerPoint PPT Presentation

Introductory talk on Beyond the Standard Models of Particle Physics and Cosmology Steve King

SHEP BSM Group 18/19 Steve King Rome Samanta Ye-Ling Zhou Pasquale Di Bari Josu Adam Adam Hernandez Huchan Lee Murphy Forster Susana Elena Kareem Sam Sedgewick Farrag Perdomo Rowley

The Standard Models of Particle Physics & Cosmology SFK 1510.02091 t R t R c R U (1) Y t R c R u R ν dec c R u R R u R u R ν sol ν dec u R R R d R ν atm u R ν sol R R τ R d R d R ν atm ν atm d R R R τ R d R d R µ R e R µ R SU (3) C e R e R leave many questions unanswered...

BSM Motivations • Hierarchy problem - Higgs mass << Planck scale • Origin of neutrino mass - unknown • 28 parameters - surely too many • 3 generations - why? SHEP BSM group • 3 forces unification - addresses • Gravity - stands apart from SM all these • Dark matter & Dark energy - not explained questions • Why only matter in the universe?

Dark Matter? Ye-Ling Zhou Adam • many new models of DM Murphy proposed by group members • DM is studied in combination with other phenomenologies (leptogenesis, B anomalies, Elena astrophysical observations also in collaboration with Astro Perdomo group and collider constraints) Kareem Farrag

BSM with Cosmology and Neutrinos Two reasons not to despair after LHC null results (so far and barring anomalies!): Philosophical approach: There are two possible outcomes: if the result confirms the hypothesis, then • you have made a discovery. If the result is contrary to the hypothesis, then you have made a discovery (E. Fermi) Pragmatic approach: Still solid motivations for New Physics come from Cosmology and Neutrinos: • Cosmological puzzles: ? Neutrino masses and mixing Dark Matter (very strong) • (obvious indication of BSM physics Matter-Antimatter asymmetry (strong) • because of SM definition, less obvious Inflation (quite strong) • Accelerating Universe expansion (likely) to which extent SM has to be extended) • It is reasonable that the same BSM physics responsible for neutrino masses and mixing can also address the cosmological puzzles: Finding scenarios able to realise this connection is our main research line but also… ….the connection itself involves fascinating physics: non-equilibrium systems, kinetic theory (Boltzmann equations, density matrix equations, QKE, Schwinger-Dyson equations,flavour effects), GR and beyond, Gravitational Waves (NEW GIFT), cosmic rays, neutrino telescopes, fluid-dynamics, self-gravitating systems, non-standard cosmology,…..

Leptogenesis - the leading candidate for the baryon asymmetry of the Universe Leptogenesis in GUTs of Flavour Fred Bjorkeroth Postdoc in Frascati Leptogenesis in Littlest Seesaw Marco Chianese (just moved η B = n B − n ¯ = n B to B ≈ 6 × 10 − 10 GRAPPA) n γ n γ

Flavour Why three families? Why these masses? Recently study of Steve King and Ye-Ling Zhou on how discrete flavour symmetries can rise from the breaking of SO(3) using supersymmetric potentials (1809.10292)

Origin of quark and lepton masses? t u d c e s b

Origin of quark and lepton mixing? CKM PMNS d s b ν ν ν 1 2 3 u ν e c ν μ t ν τ [Stone, 1212.6374]

Unification Strong Weak Electromagnetic

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