The Curiosity Frontier Roni Harnik, Fermilab
Why Are We Here? We are curious . We are like kids that have many many questions. We receive great pleasure from finding things out. What are we curious about?
A Curiosity List: (Partial! In no particular order.) Is there any physics beyond the standard model? What sets the EW scale? Is it natural? Is the world supersymmetric? Is there a Higgs boson? What is Dark Matter? Is there a dark sector? What is Dark Energy? Can the CC be natural? Are we part of a Universe or a Multiverse? What sets the fermion masses? Why is there more matter than anti-matter? Are neutrinos their own anti-particles? Are there sterile Neutrinos? Do neutrino interact in a non standard way? What solves strong CP? Is there an axion? Is it Dark matter? How many space-time dimensions do we live in? Do the forces unify? ......
A Curiosity List: (Partial! In no particular order.) Is there any physics beyond the standard model? What sets the EW scale? Is it natural? Is the world supersymmetric? I s i t t Is there a Higgs boson? h e S M H i g g s b o s o n ? What is Dark Matter? Is there a dark sector? What is Dark Energy? Can the CC be natural? Are we part of a Universe or a Multiverse? What sets the fermion masses? Why is there more matter than anti-matter? Are neutrinos their own anti-particles? Are there sterile Neutrinos? Do neutrino interact in a non standard way? What solves strong CP? Is there an axion? Is it Dark matter? How many space-time dimensions do we live in? Do the forces unify? ......
A Curiosity List: (Partial! In no particular order.) Is there any physics beyond the standard model? What sets the EW scale? Is it natural? Is the world supersymmetric? I s i t t Is there a Higgs boson? h e S M H i g g s b o s o n ? What is Dark Matter? Is there a dark sector? What is Dark Energy? Can the CC be natural? Are we part of a Universe or a Multiverse? What sets the fermion masses? Why is there more matter than anti-matter? Are neutrinos their own anti-particles? Note! Are there sterile Neutrinos? These questions do Do neutrino interact in a non standard way? not belong to any What solves strong CP? frontier. Is there an axion? Is it Dark matter? How many space-time dimensions do we live in? Do the forces unify? They are questions ...... that drive our field.
Frontier-ology The more technical reason we’re here is - we want to know how to best answer these questions. We have a bunch of experimental tools that can (hopefully) answer them. At some point (for practical purposes) the tools we use were divided into 3 groups, or frontiers. The questions, and the physicist that are curious about them, do not fall into these groups.
Frontiers The Curiosity Frontier
Frontiers The Curiosity Frontier =
Frontiers The Curiosity Frontier =
Frontiers The Curiosity Frontier
Frontiers The Curiosity Frontier ???
Curiosity What drives the field is our childish curiosity . How does Nature work? So lets think like children! } If a child is curious about something she goes at it with all her senses . All her tools . All “frontiers” . usually done simultaneously!
Speaking of child-like curiosity... What’s that box over there?
Speaking of child-like curiosity... What’s that box over there? Goody! a present!!! What is it?? oh boy!
Speaking of child-like curiosity... What’s that box over there? Goody! a present!!! What is it?? oh boy! So, how does a child approach this? lets dissect her actions in slow motion.
1. Guess: “Theory” The theorist springs into action:
1. Guess: “Theory” The theorist springs into action: wow! mommy! what is it?! I bet it a bike! I asked for a bike... maybe its a bus! or a doll? I can fit a bunch of extra dimensions in there...
1. Guess: “Theory” The theorist springs into action: wow! mommy! what is it?! I bet it a bike! I asked for a bike... maybe its a bus! or a doll? I can fit a bunch of extra dimensions in there... 2.Observe: “Cosmic” Cosmic frontier type observation:
1. Guess: “Theory” The theorist springs into action: wow! mommy! what is it?! I bet it a bike! I asked for a bike... maybe its a bus! or a doll? I can fit a bunch of extra dimensions in there... 2.Observe: “Cosmic” Cosmic frontier type observation: Wow! cool wrapping paper! looks very homogeneous, but Its too small to be a bike....
“Energy” 3. Open the box: Answer the question directly . Head on.
“Energy” 3. Open the box: Answer the question directly . Head on. But... sometimes you don’t get the answer but just a clue. or just another box .... and another...
“Energy” 3. Open the box: Answer the question directly . Head on. But... sometimes you don’t get the answer but just a clue. or just another box .... and another... 4. Rattle the box, feel it, Listen closely: Though it does not give a definitive answer, “Intensity” sometimes the giveaway clue come from indirect observation:
“Energy” 3. Open the box: Answer the question directly . Head on. But... sometimes you don’t get the answer but just a clue. or just another box .... and another... 4. Rattle the box, feel it, Listen closely: Though it does not give a definitive answer, “Intensity” sometimes the giveaway clue come from indirect observation: hmmm, its not that heavy... but it feels sort of hard... lets shake it a bit and listen...
A Curiosity List: (Partial! In no particular order.) Is there any physics beyond the standard model? What sets the EW scale? Is it natural? Is the world supersymmetric? I s i t t Is there a Higgs boson? h e S M H i g g s b o s o n ? What is Dark Matter? Is there a dark sector? What is Dark Energy? Can the CC be natural? Are we part of a Universe or a Multiverse? What sets the fermion masses? Why is there more matter than anti-matter? Are neutrinos their own anti-particles? Are there sterile Neutrinos? Do neutrino interact in a non standard way? What solves strong CP? Is there an axion? Is it Dark matter? How many space-time dimensions do we live in? Do the forces unify? ......
Do Intensity Frontier experiments help satisfy our curiosity? of course! Here are examples.
Higgs Is it the SM Higgs boson? Note: Stereotypically, the Higgs is in the “energy frontier”. But recall, the questions do not get divided.
Higgs A timely topic. Probing Higgs couplings is a pressing goal. A remarkable opportunity to look for NP . CMS Preliminary = 125 GeV m H -1 = 7 TeV, L = 5.1 fb s -1 = 8 TeV, L = 5.3 fb s bb (VH tag) H → bb (ttH tag) H → (0/1 jet) H → τ τ (VBF tag) H → τ τ (VH tag) H τ → τ (untagged) H → γ γ (VBF tag) H γ → γ WW (0/1 jet) H → WW (VBF tag) H → WW (VH tag) H → ZZ H → 8 4 6 2 0 -2 -4 -6 Best fit / σ σ H SM How about non-SM Higgs coupling?
Higgs & Flavor Violation In the presence of new physics , Yukawa couplings can violate flavor: L Y = − m i ¯ R − Y ij ( ¯ L f j f i L f i f i R ) h + h.c. + · · · Any fermion bilinear is possible: µe τ µ τ e (UV models are easy to come by) tc tu . . . How large can FV be? Very roughly- | Y ij Y ji | . m i m j v 2 . l ” a r u t a n “ s i s i h t w o e l b g n i h t y n A
Higgs couplings to µe Higgs coupling to µe is constrained, e.g. by: mu to e gamma (1 and 2-loop) : µ e µ µ e e µ µ e τ µ τ h γ , Z h γ , Z h W W µ µ τ µ t τ e t τ P + Y Y ∗ P P R + Y µ Y ∗ P L τ µ R L τ τ τ τ τ γ γ γ r fl a v o t h e t o u t i n g r i b
Higgs couplings to µe Higgs coupling to µe is constrained, e.g. by: mu to e gamma (1 and 2-loop) : µ e µ µ e e µ µ e τ µ τ h γ , Z h γ , Z h W W µ µ τ µ t τ e t mu to e conversion: τ P + Y Y ∗ P P R + Y µ Y ∗ P L τ µ R L τ τ τ τ τ γ h γ γ r fl a v o t h e t o u t i n g r i b µ Y ∗ µe P L + Y eµ P R e µ µ µ e Y ∗ µµ P L + Y µµ P R Y ∗ µe P L + Y eµ P R h + γ N N N N
Higgs couplings to µe Harnik Kopp Zupan 1209.1397 10 1 H g - 2 L e for Im H Y m e Y e m L = 0 Outside of H g - 2 10 0 LHC reach. L e + M Æ M E 10 - 1 D EDM e for Re H Y m e Y e m L = 0 M » Y m e Y e m » = m e m m ê v 2 10 - 2 e Probing 10 - 3 “natural” models. » Y m e » 10 - 4 m Æ 3e H approx L BR H h Æ m e L = 0.99 10 - 5 m Æ e g m Æ e conv. Mu2e 10 - 6 H projection L 10 - 7 10 - 12 10 - 10 10 - 4 10 - 8 10 - 6 10 - 2 10 - 1 10 - 8 0.5 10 - 2 10 - 1 10 0 10 1 10 - 8 10 - 7 10 - 6 10 - 5 10 - 4 10 - 3 » Y e m »
Higgs and EDM’s EDM searches also constrain FV & CPV couplings. Consider Higgs couplings to e-tau: electron EDM: h | Im( Y e τ Y e τ ) | < 1 . 1 × 10 − 8 τ τ µ µ e e Y ∗ µ τ P L + Y τ µ P R Y ∗ τ µ P L + Y µ τ P R starting to probe “natural” models. γ Note: We get a similar bound on top-up-Higgs couplings from the neutron EDM.
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