Beyond the Standard Model with global fits: then, now and tomorrow - PowerPoint PPT Presentation

The problem The current state of the game Future challenges Beyond the Standard Model with global fits: then, now and tomorrow Pat Scott Imperial College London Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem The current state of the game Future challenges Outline The problem 1 Introduction Global fits Including astroparticle observables The current state of the game 2 Present limits Coverage Scanning challenges Future challenges 3 Respectable LHC likelihoods Parameter space → Theory space Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Outline The problem 1 Introduction Global fits Including astroparticle observables The current state of the game 2 Present limits Coverage Scanning challenges Future challenges 3 Respectable LHC likelihoods Parameter space → Theory space Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics and friends ++ 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics and friends ++ 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics and friends ++ 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics and friends ++ 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables The Standard Model of particle physics and friends ++ 19 free parameters: (10 masses, 3 force strengths, 4 quark mixing parameters, 2 ‘vacuumy things’) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Searching for new physics Many reasons to look for physics Beyond the Standard Model (BSM): Higgs mass (hierarchy problem + vacuum stability) Dark matter exists Baryon asymmetry Neutrino masses and mixings Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Searching for new physics Many reasons to look for physics Beyond the Standard Model (BSM): Higgs mass (hierarchy problem + vacuum stability) Dark matter exists Baryon asymmetry Neutrino masses and mixings So what do we do about it? Make new particles at high- E colliders Study rare processes at high- L colliders Hunt for dark matter (direct + indirect detection) Look at cosmological observables (CMB, reionisation, etc) Look for impacts of unexpected or missing neutrinos Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Searching for new physics Many reasons to look for physics Beyond the Standard Model (BSM): Higgs mass (hierarchy problem + vacuum stability) Dark matter exists Baryon asymmetry Neutrino masses and mixings So what do we do about it? Make new particles at high- E colliders Study rare processes at high- L colliders Hunt for dark matter (direct + indirect detection) Look at cosmological observables (CMB, reionisation, etc) Look for impacts of unexpected or missing neutrinos Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches I Question How do we know which models are in and which are out? Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches I Question How do we know which models are in and which are out? Answer Combine the results from different searches Simplest method: take different 0 exclusions, overplot them, conclude things are “allowed” or − 1 log 10 λ hs Γ h → SS “excluded” − 2 XENON100 (2012) Simplest BSM example: the XENON100 × 5 XENON100 × 20 Ω S / Ω DM = 1 scalar singlet model XENON1T − 3 (Cline, Kainulainen, PS & Weniger, PRD , 1306.4710) 45 50 55 60 65 70 m S (GeV) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches II That’s all well and good if there are only 2 parameters and few searches. . . Question What if there are many different constraints? Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches II That’s all well and good if there are only 2 parameters and few searches. . . Question What if there are many different constraints? 0 . 5 Excluded by Γ h → SS ) k n c a Answer P l Future 90% CL + A T C 0 . 0 + m i r e F ( Future 1 σ CL Combine constraints in a − 0 . 5 Ω S / Ω DM = 1 log 10 λ hs statistically valid way − 1 . 0 → composite likelihood Current 1 σ CL (Fermi + WMAP7) − 1 . 5 − 2 . 0 (Cline, Kainulainen, PS & Weniger, PRD , 1306.4710) 2 . 0 2 . 5 3 . 0 3 . 5 log 10 ( m S / GeV) Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches III That’s all well and good if there are only 2 parameters and few searches. . . Question What if there are many parameters? Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow

The problem Introduction The current state of the game Global fits Future challenges Including astroparticle observables Combining searches III That’s all well and good if there are only 2 parameters and few searches. . . Question What if there are many parameters? Answer Need to scan the parameter space (smart numerics) interpret the combined results (Bayesian / frequentist) project down to parameter planes of interest (marginalise / profile) → global fits Pat Scott – Oct 29 – Oslo Theory Seminar Beyond the Standard Model global fits: then, now and tomorrow