summary of wg6...2006/12/16 · summary of wg6: ckm 2006 nagoya, 11 16 dec 2006 gino isidori [infn...
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![Page 1: Summary of WG6...2006/12/16 · Summary of WG6: CKM 2006 Nagoya, 11 16 Dec 2006 Gino Isidori [INFN Frascati]on behalf of WG6 conveners: Yuval Grossman, Riosuke Itoh, G.I., Patrick](https://reader033.vdocuments.mx/reader033/viewer/2022052001/6013644708eccb55a0708473/html5/thumbnails/1.jpg)
Summary of WG6:
CKM 2006 Nagoya, 1116 Dec 2006
Gino Isidori [INFNFrascati]on behalf of WG6 conveners:
Yuval Grossman, Riosuke Itoh, G.I., Patrick Koppenburg
CKM fits New Physics&
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CKM 2006 Nagoya, 1116 Dec 2006
Status of CKM fits
UTfit [Martinelli] CKMfitter [Trabelsi]
What we learnt from CKM fits about NP
Model-Indep. bounds [Bona, Lacker]MFV [Grinstein]Top-flavour violation [Papucci] SUSY [Silvestrini, Paradisi, Yamashita] Little-Higgs [Buras, Tarantino]
Where to look for NP in the flavour sector
Rare K decays [Smith, Mescia, Ruggiero, HyoSang Lee] Rare B decays [de Nardo, Rescigno, Dickens, Tomoto]Super-CKM fits @ LHC & super-B [Onogi, Vagnoni, Pierini, Itoh]Bs physics [Papucci, Schwartz, Baracchini, Casey, van Hunen, Magini]
Conclusions
Summary of WG6:
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ϕ1
ϕ3ϕ2
Status of CKM fits
G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Three main messages:
The tension between exclusive & inclusive Vub
prevent to draw definite conclusions from the only
interesting anomaly (the slight disagreement between sin2β & Vub)
Excellent overall consistencywith the SM predictions(redundant consistency
checks of the CKM mechanism)
vs.
For most of usthe difference
vs.
is in the
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Trabelsi
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Martinelli
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Ferroni
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Martinelli
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Theory Models(what we learnt from CKM fits about NP)
G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Three complementary strategies:
Model-independent fits
Extended CKM fits including NP under general assumptions
(e.g. no NP in tree-level amplitudes)
very general (useful tool)
no predictive power; no dynamics
EFT approaches
(MFV, nMFV...)
predictive (falsifiable) approaches based only on few underlying hypothesis
(general probes of the underlying flavour symmetry)
no dynamics
Explicit models
(SUSY, Little Higgs...)
complete theories
several free parameters...
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Examples of Model-independent fits:
New physics in ∆F=2 and negligible NP contributions in
tree-level observables (used to determine the CKM matrix)
Lacker Bona
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Examples of Model-independent fits:
New physics in ∆F=2 and negligible NP contributions in
tree-level observables (used to determine the CKM matrix)
Lacker Bona
Key role played by Lattice
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
only assuming cNP~ (yt Vtb*Vtd)2
we get a bound on Λ in the TeV range
(yt Vtb*Vtd)2
16 π2 ΜW2
M(Bd-Bd) ~ + cNP
1
Λ2
_
if you don't think this is an accident... ⇒ MFV
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Grinstein
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
SU(3)Q×SU(3)U×SU(3)D
Quark Flavour Group
λU
λD
~VCKM
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
SU(3)Q×SU(3)U×SU(3)D
Quark Flavour Group
λU
λD
~VCKMAdding more Higgs doublets we can change the relative normalization of λU & λD (controlled by tanβ)
Adding more spurions (new sources of flavour symmetry breaking) ⇒ next-to-MFV...
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
A few comments:
I) The MFV hypothesis is far from being verified:
To prove MFV from data we need to
observe some deviation form the SM in FCNC s
observe the CKM pattern predicted by MFV [within same type of FCNCs]
∆F =2 processes are in principle excellent candidates to prove MFV, but so far we are limited by theoretical (Lattice) uncertainties.
Best ∆F=1 candidates: Bd,sl+l- & Ku,dπνν
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
I) The MFV hypothesis is far from being verified
II) Still room for additional spurions (with specific flavour structures)
E.g.: O(1) flavour-symmetry breaking only in the top sector:
Papucci
A few comments:
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
I) The MFV hypothesis is far from being verified
A few comments:
II) Still room for additional spurions (with specific flavour structures)
III) The MFV hypothesis leaves open the possibility of spectacular NP effects in the charged lepton sector:
MFV + GUTs ⇒ LFV rates cannot be arbitrarily suppressed by lowering MR:
Α( li → lj γ) = a [Ye Yv+Yv]ij + b [YU
+YU YD ]ij
MR independentNormalization depending on MR
If there are new particles carrying lepton-flavour at the TeV scale (Λeff < 10 TeV)
then MEG should see µ→ eγ (BR >10−13)~
~
Cirigliano, Grinstein, G.I., Wise, '06
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
I) The MFV hypothesis is far from being verified
A few comments:
II) Still room for additional spurions (with specific flavour structures)
III) The MFV hypothesis leaves open the possibility of spectacular NP effects in the charged lepton sector:
MFV + GUTs ⇒ LFV rates cannot be arbitrarily suppressed by lowering MR:
Α( li → lj γ) = a [Ye Yv+Yv]ij + b [YU
+YU YD ]ij
MR independentNormalization depending on MR
If there are new particles carrying lepton-flavour at the TeV scale (Λeff < 10 TeV)
then MEG should see µ→ eγ (BR >10−13)~
Cirigliano, Grinstein, G.I., Wise, '06
N.B.: the interest of LFV processes is shared by all explicit NP
models [not covered for time reasons] ~
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Explicit NP models:
SUSY Little Higgs
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Silvestrini
SUSY
N.B.: non-vanishing δ's are expected by RGE even in
minimal GUT frameworks [Masiero; Yamashita]
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Silvestrini
SUSY
presentbounds
N.B.: non-vanishing δ's are expected by RGE even in
minimal GUT frameworks [Masiero; Yamashita]
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Silvestrini
SUSY
Non-vanishing δ's could be around the corner (explaining some of the current anomalies and/or saturate all the non-well-measured quantities)
but the overall picture tends toward some sort of alignment/universality (MFV)
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
SUSY
Even if SUSY has a MFV structure and squarks are in the TeV region, if tanβ is large (~ 40-50 ) and mH is not too heavy (consistent framework) one can still expect large non-standard effects in helicity-suppressed observables:
Key low-energy observables to probe the large tanβ scenario
Paradisi
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
SUSY
Even if SUSY has a MFV structure and squarks are in the TeV region, if tanβ is large (~ 40-50 ) and mH is not too heavy (consistent framework) one can still expect large non-standard effects in helicity-suppressed observables:
Key low-energy observables to probe the large tanβ scenario
Paradisi
Γ(B+ µ+ν)Γ(B+ τ+ν)
RBµτ = (RBµτ)SM up to O(50%) deviations from G.I. & Paradisi '06
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
LittleHiggs
Buras/Tarantino
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
LittleHiggs
The large enhancements require some fine-tuning in the new flavour structures
But the limited number of free parameters leads to unambiguous correlations which can be easily checked against data and against other NP models
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Mescia
SUSY LittleHiggs
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Where to look for NP in the flavour sector
G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
a collective effort...
Rare K decays
Rare B decays
CPV in the Bssystem
Super CKM fits& CPV in
penguin modes
Precision tests [LFU, CKM unitarity]
in B & K semileptonic decays
LFV in µ & τ decays
EDMs
Where to look for NP in the flavour sector
g-2
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
a collective effort...
Rare K decays
Rare B decays
CPV in the Bssystem
Super CKM fits& CPV in
penguin modes
Precision tests [LFU, CKM unitarity]
in B & K semileptonic decays
LFV in µ & τ decays
EDMs
Where to look for NP in the flavour sector
Not covered in this summary because of time reasons (& partial cover by other WGs), not because it's not interesting....
Th: Papucci,
φs: Casey, van Hunen, Magini
Y(5S): Baracchini, Schwartz
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Rare decays
Β+ l+ ν
Nine
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Veltri
:
(good)
Rare K decays
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
T. Yamanaka
H.S. Lee
Rare K decays
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
super
One of the most interesting observable at a super-B factory, together with the Β µν ⇒ scalar currents & precise LFU tests
Itoh
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Rescigno
B µ+µ− @ Tevatron
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
B µ+µ− @ Tevatron
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Super-CKM fits @ LHC & super-B
Strategy to bound NP effects from CKM fits: ● Determine ρ,η from tree-level● Extract/bound NP from ∆F =2 processes
NP sensitivity limited by theoretical (Lattice) uncertainties
Key issue to access the possible evolution of Lattice errors
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Super-CKM fits @ LHC & super-B
Key issue to access the possible evolution of Lattice errors:
Onogi
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
Assuming future Lattice errors ~ 1-2 % + super-B data:
Pierini
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
2.3 %2.2 %
Vagnoni
A more fair compariosn...:
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
A more (too...?) conservative perspective:
Itoh
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
A more (too...?) conservative perspective:
Itoh
For a fair comparisonimportant to agree on common standards for the Lattice inputs
The super-B program can and must be more ambitious and more exciting !
⇒ challenging but unique & very interesting goals, such as
τ→ µγ @ 10−10 Γ(B+ µ+ν)Γ(B+ τ+ν)
@ 1%
The future of flavour physics is the discovery of the connections between quark- and lepton-flavour structures
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Conclusions
G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
New physics is there !!We know it for sure, at least from neutrino physics & dark matter [→ Masiero]
What we don't know yet are
energy scale & flavour strucutre of NP
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
LHC
we should not be pessimistic...
LHC will find NP @ TeV !
New physics is there !!We know it for sure, at least from neutrino physics & dark matter [→ Masiero]
What we don't know yet are
energy scale & flavour strucutre of NP
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
LHC...and the collective effort toward flavour physics will be rewarded !
Rare K decays
Rare B decays
CPV in the Bssystem
Super CKM fits
Precision tests in B & K
semilept. decays
LFV in µ & τ decays
EDMs
g-2
New physics is there !!We know it for sure, at least from neutrino physics & dark matter [→ Masiero]
What we don't know yet are
energy scale & flavour strucutre of NP
we should not be pessimistic...
LHC will find NP @ TeV !
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G. Isidori – Summary of WG6: CKM fits & NP CKM 2006
LHC...and the collective effort toward flavour physics will be rewarded !
Rare K decays
Rare B decays
CPV in the Bssystem
Super CKM fits
Precision tests in B & K
semilept. decays
LFV in µ & τ decays
EDMs
g-2
New physics is there !!We know it for sure, at least from neutrino physics & dark matter [→ Masiero]
What we don't know yet are
energy scale & flavour strucutre of NP
we should not be pessimistic...
LHC will find NP @ TeV !
THANKS TO
ALL THE WG6 SPEAKERS & CO-CONVENERS