Summary of WG6...2006/12/16 · Summary of WG6: CKM 2006 Nagoya, 11 16 Dec 2006 Gino Isidori [INFN...

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&

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:

ϕ1

ϕ3ϕ2

Status of CKM fits

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


Trabelsi


Martinelli


Ferroni


Martinelli

Theory Models(what we learnt from CKM fits about NP)



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...


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


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


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


Grinstein


SU(3)Q×SU(3)U×SU(3)D

Quark Flavour Group

λU

λD

~VCKM


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...


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


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:



A few comments:


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



A few comments:


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] ~


Explicit NP models:

SUSY Little Higgs


Silvestrini

SUSY

N.B.: non-vanishing δ's are expected by RGE even in

minimal GUT frameworks [Masiero; Yamashita]


Silvestrini

SUSY

presentbounds

N.B.: non-vanishing δ's are expected by RGE even in

minimal GUT frameworks [Masiero; Yamashita]


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)


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


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


LittleHiggs

Buras/Tarantino


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


Mescia

SUSY LittleHiggs


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


g-2


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


EDMs


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


Rare decays

Β+ l+ ν

Nine


Veltri

:

(good)

Rare K decays


T. Yamanaka

H.S. Lee

Rare K decays


super

One of the most interesting observable at a super-B factory, together with the Β µν ⇒ scalar currents & precise LFU tests

Itoh


Rescigno

B µ+µ− @ Tevatron


B µ+µ− @ Tevatron


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


Super-CKM fits @ LHC & super-B

Key issue to access the possible evolution of Lattice errors:

Onogi


Assuming future Lattice errors ~ 1-2 % + super-B data:

Pierini


2.3 %2.2 %

Vagnoni

A more fair compariosn...:


A more (too...?) conservative perspective:

Itoh


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

Conclusions



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


LHC

we should not be pessimistic...

LHC will find NP @ TeV !





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


EDMs

g-2







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


EDMs

g-2






THANKS TO

ALL THE WG6 SPEAKERS & CO-CONVENERS

Summary of WG6...2006/12/16 · Summary of WG6: CKM 2006 Nagoya, 11 16 Dec 2006 Gino Isidori [INFN...

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