LHC phenomenology of supersymmetric models with a U (1) R baryon - PowerPoint PPT Presentation

LHC phenomenology of supersymmetric models with a U (1) R baryon number Kevin Earl arXiv: 1703.03866 Carleton University May 31, 2017 CAP 2017 1

Outline 1. Motivation 2. U (1) R baryon number 3. Phenomenology 4. Conclusion 2

Motivation The Minimal Supersymmetric Standard Model (MSSM) Quarks Squarks ~ ~ ~ ~ γ H 0 u c t u c t A H d ~ ~ ~ ~ ~ Gauge bosons d s b d s b H ± H - Z B H d Higgs bosons ~ ~ Higgsinos ~ ~ ~ Gauginos ν e ν μ ν τ ν e ν μ ν τ W ± W H H + H u ~ ~ ~ ~ ~ H 0 e μ τ e μ τ g g h H u Leptons Sleptons 3

Motivation The Minimal Supersymmetric Standard Model (MSSM) Quarks Squarks ~ ~ ~ ~ γ H 0 u c t u c t A H d ~ ~ ~ ~ ~ Gauge bosons d s b d s b H ± H - Z B H d Higgs bosons ~ ~ Higgsinos ~ ~ ~ Gauginos ν e ν μ ν τ ν e ν μ ν τ W ± W H H u H + ~ ~ ~ ~ ~ H 0 e μ τ e μ τ g g h H u Leptons Sleptons ~ χ 0 Neutralinos ~ χ ± Charginos 4

Motivation MSSM: field content Superfield SU (3) c SU (2) L U (1) Y 3 2 1 / 6 Q ¯ U c 3 1 − 2 / 3 ¯ D c 3 1 1 / 3 1 2 − 1 / 2 L E c 1 1 1 H u 1 2 1 / 2 1 2 − 1 / 2 H d 1 1 0 B W i 1 3 0 G a 8 1 0 5

Motivation MSSM: superpotential The most general superpotential: W = y u QH u U c − y d QH d D c − y e LH d E c + µ H u H d ← good + 1 2 λ LLE c + λ ′ LQD c + 1 2 λ ′′ U c D c D c + ǫ H u L ← bad lepton number violating baryon number violating Can we forbid the undesirable terms? 6

Motivation R -parity Discrete Z 2 symmetry forbids undesirable terms. Consequences: � supersymmetric particles are produced in pairs � decaying supersymmetric particles must produce at least one supersymmetric particles � the lightest supersymmetric particle (LSP) is stable ¯ t p q ¯ ˜ W ∓ t ∗ p q ∗ ˜ χ 0 χ ∓ χ 0 χ 0 χ 0 χ ± ˜ t p q ˜ p W ± t q 7