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Moriond EWK, LaThuile, March 23, 2019
THEORY SUMMARY
Gudrun Hiller, TU Dortmund
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Theory themes 2019
29 (+ 6 in YSF) TH-talks ; broad range of Theory/Pheno topics
2019: ”feeble”, ”dark”, ”flavor”, ”precision”
the quest for BSM-physics:
Goertz
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Going ahead
– precision (SM background+interpretation)
– correlations/fits/overconstraining
– new directions (models, phenomena, enlarging parameter space)
– handshake TH + EXP
Tytgat Yamazaki
leaving no stone unturned
(indeed, you’ll see)
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PRECISION
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Precision EWK
Giardino
”... obsessing about precision to look for BSM”: Fits on EWKparameters, and in SMEFT LSMEFT = LSM +
∑i,nC
(n)i O
(n)i /Λn
”SM [from this side] looks healthy.. but room for deviations”interesting new 2σ ”hint” in α, known from atomic precision andelectron g − 2
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Polarization @ NLO pp→ WZ +X
BaglioExcellent agreement for NLO EW full vs DPADouble-pole approx:A(ab→ WZ → 3`ν) =
∑λi
A(ab→WZ)A(W→`1ν)A(Z→`2`3)Q1Q2
,Qi = q2
i −M2 + iMΓ
obs in angular distribution: precision tests and nulltests †
† big business in rare B decays
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muon g − 2
Hadronic light by light contribution from lattice QCD
Blum
”Prel. QEDL a→ 0, L→∞ limits taken; QED∞ w.i.p. Unlikely thatHLBL will rescue SM”
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g − 2, both of them
Hoferichter
Note, ∆aµ > 0; possible correlation with µ→ eγ, and muon EDM.”[Model with VL fermions] works for ae but tensions with aµ”.Modification with extra scalar (for aµ) and ae from Higgs work –interesting lepton flavor structure beyond (me/mµ)n scaling Hormigos
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ν-fits Update PMNS, masses
Hernandez
Some tensions (Kamland 2σ -∆m221, NOvA-T2K (δCP ), Normal ordering favored
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0νββ in EFT
Connecting BSM model with ∆L = 2 data
Dekens
”Renormalization in χEFT requires counterterms beyond NDA. ...appears at leading order, O(1) impact on amplitude”. Hadronic’obstacle’ in precision, beyond nuclear matrix elements.
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THE FEEBLE-WORLD
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Feeble with or without Darkness, or Flavor
massive, emerging TH activities∑
= 14 + 4 talks
Ongoing quest for BSM, here, in particular DM and the flavor puzzle,the latter revived by the flavor anomalies, triggered new type ofmodel building: ”data-driven”, ”simplified”, ”bottom-up”; Broad rangeof (novel) signatures and correlations; multi-experiments (directdetection, axion serach, collider, astro, cosmo,..)
Allanach,Ruderman, private comm.
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Feebleness
Bauer E.g.: goldstones, new gauge bosons, ”axions, hidden/dark photons”, slow decays (by
kinematics)
strategies: high statistics, displaced vertices, exotic decays of Z,H,B,D∗, µ, ....; signatures at many
exp settings
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8Be anomaly
Simon King light Z′ with feeble g ∼ 10−4, g′ ∼ 10−5 and lepton -nonuniversal interactions, M ∼ 17
MeV
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dark, darker,...
The particle physics connection
Bauer, Schwaller, Tytgat, Goertz, Covi, Hati, May,Reig, King,Arias-Aragon
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Minimal ADM, mν and BAU
asymmetric dark matter scen. mDM ∼ 5mp gives ΩDM ' 5Ω;”minimal” 2 RH neutrinos, SM×SU(2)D × Z3
Covi
Works with Yukwas with large CP-phase; only one Majoranaphase a low enery; effective mass
meff = |∑miU
2ei| within few meV.
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Flavorful dark matter
QCD × QCDDARK ; colored heavy mediator, couples to SM quarkflavors; light dark pions m ∼ GeV
Schwaller
Dark pions with or without flavor light, long-lived; searchable in fixed target and ∆F = 1 invisible
decays (Belle II, NA62), and fixed target πD → SM pions, K. ”emerging jets-signatures”
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Flavor hierachies and strong CP
Horizontal U(1)H to explain SM flavor hierachies (masses, CKM);Peccei-Quinn axion from U(1)PQ to explain smallness of EDMs (ϑ);take one scalar:field for both: Φ = 1/
√2(vϕ + ϕ) exp ia/vϕ, where ϕ:
lavon, a: axiflavon/ (pseudo)goldstone, light
Goertz
Link with flavor and axion very predictive – in reach of NA 62 K → πa;Axiflavon can be CDM if
ma . 10−4 − 10−5 eV.
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dark, darker,...
The (very) LHC-friendly connection
Harz, Lucente, Schwaller, Soualah, Hung
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Testing Leptogenesis – heavy RH neutrino decays
Neutrino masses from GeV seesaw with feeble Yukawas; 3 RHneutrinos mv ∼ v2F 1
MF ' 0.3(GeV
M)( F2
10−14 ) eV low scale leptogenesisphenomenology with ∼ GeV heavy RH neutrinos.
Lucente
Exploration for pp and heavy metal (ion) collisions, from W and B-decays. Suggests opportunity for
Argon. Simple model (HNL) – other models as well testable.
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Testing dark matter and more
Feebly-interacting dark matter through Freeze-inL = SM+ singlet scalar S + SU(2)L-singlet vector-like fermions F ;Yukawa-portal yf FSfSM to SM-fermions + Z2-symmetry
HarzFF -pair production and slow decay to DM plus SM-lepton or quark. For hadronic mode reach at 13
TeV LHC up to mF ∼ 1.8 TeV. Determination of mF and cτ allows to understand relation with relic
density – sensitive to reheating temperature TR; Vector-like fermions, LLPs, also Hung
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dark, darker,...
The Astro- connection
Randall, Stefanek, Ruderman, Kuehnel, Yamazaki
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ALPs in GR waves
S =∫d4x√−g(
1/2dµϕdµϕ− V (ϕ)− 1/4XµνXµν − α4fϕXµνXµν
), expl breaking
V = m2f2[1− cosϕ/f ] Dark photon X and axion-like particle (ALP) ϕ
Stefanek
ALP reach in Pulsar Timing Arrays (green), LISA (red), future highfrrequencey detectors (blue) Sensitivity to large decay constants inGR - complementarity to other ALP searches
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DM, post-modern
1.new ideas from particle physics for astonomy: Darkly charged DM(self-interacting, not necessarily with SM) viable!
Randall
2. Dwarf galaxies challenge ΛCDM
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Dark photons in 21 cm CMB
Upsetting photon spectra thu interaction with dark photons (theycould come from dark matter ALP), e.g ma = 10−3eV, τa ' 1012y,ε ∼ 10−7
Ruderman
”probing the low end of the CMB – a new arena for particle physics”
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FLAVOR
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Flavor
12+4 TH contributions partial overlap with feeble-world
Flavor puzzle/ flavor origins Steven King, Dev, Soualah, May,Rowley, Goertz, Hati (horizontal/family, Left-right symmetries)
anomalies Soni, Gisbert, Hati, Toledo, Heeck,Straub, Allanach,Angelescu, Hormigos, May, Rowley,Arias-Aragon
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Anomalies
– ε′/ε ? Gisbert finds ε′/ε compatible with SM
–g − 2 Hormigos asymptotically safe BSM
– RD∗ , RDπ τ vs e, µ lepton universality Toledo changed SM prediction
– RK , RK∗ : µ vs e lepton universality1. Leptoquarks,2. Z ′,3. model-independent
Leptons maybe more different than we thought. Hints for leptonnon-universality triggered new bottom-up model building and couldhelp to progress with flavor. Correlations, e.g. LFV, direct searches,K,D,B copiously, help narrow down model. Great opportunity, so..
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Single leptoquark solution
minimal, predictive: Vector LQ, for RK and RD ”just around thecorner” Angelescu
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Pati-Salam leptoquark solution
Heeck Pati-Salam LQ’s for RK and RD and seesaw II with NO
2 scalar LQs, S1 ”just around the corner”
2LQs Hati connecion with (radiative) mν , dark matter and LFV
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Z′ solutions
simplified LZ = (QλQγµQ+ LλLγµL)Z ′µ Collider reach depends onup-vs down flavor in couplings λQ,L in mass basis; third famillyhypercharge U(1)′; anomaly cancllation
Angelescu
Planck/GUT scale framework, mν seesaw, with VL fermions King
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Fits -update
Thanks, David, updates made in LaThuile Straub
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Charm is the new Beauty
Betti
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Charm is the new Beauty
Constraints on up-sector FCNCs are at the level of b-physics in thelast millenium. c→ uµµ, γ: |C(′)
9,10| . 1, |C(′)7 | . 0.3, |CT,T5| . 1, |C(′)
S,P | . 0.1.
versus |CeffSM7 | = O(0.001) , |CeffSM
9 | . 0.01 , CSM10 = 0 , (GIM !) C′SM, CSM
S,P,T,T5 = 0
Plenty of opportunities for BaBar, BESIII, Belle, Belle II and LHCb.Unique information on flavor in the up-sector
TH on rare radiative and sl ∆C = 1 nulltests and suficiently cleanobservables started. clean = clean enough
Lepton-nonunversality contest started! D0 → hhµµ LHCb D0 → hhee
BESIII, progress from BaBar Ben Haim
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Summary Summary
SM is alive, but challenged from increasing number of strategies
We are still in business with RK = 0.846+0.060+0.016−0.054−0.014 LHCb Humair with
RK ’14 and follow-ups – Looking forward to check lepton-universalityfurther in K, charm and B’s, and beyond.
Not just ”a hint”. but one that deeply rooted in flavor. If true it is agreat opportunity
It’s been a terrific week with great talks and discussions. Continue tomkae sure that no stone left unturned.
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