Federico Mescia (RyC) Outline: a. Introduction b. Our present world picture: Standard Model c. the future challenge: (Flavour Physics in the LHC era) ECM

Federico Mescia (RyC)

Outline:

a. Introduction

b. Our present world picture: Standard Model

c. the future challenge:

(Flavour Physics in the LHC era)

ECM & ICC, Universitat de Barcelona

IX Jornada Cientifica d’ECM, February 7th, 2009

Particle Physics at ECM: Phenomenology

my research activity ECM

Federico Mescia

(Flavour Physics in the LHC era)

room 6.15, tel 39195

Particle Physics at ECM: Phenomenology

IX Jornada Cientifica d’ECM, February 7th, 2009

•Once Upon a Time ~ 2000 yrs ago

• Introduction

an economical description, consistent to our “daily” observation;

at higher energy scale <-> at shorter distances, new phenomena come up and new degrees of freedom are needed!

Federico Mescia:”Particle Physics Phenomenology” ECM room 6.15, tel 39195

• Dep. d’Estructura i Constituents de la Materia about ~ 2000 years ago:

•Once Upon a Time ~ 2000 yrs ago

• Introduction


an economical description, consistent to our “daily” observation;


Modern Language: example of effective theory valid at at our day-life scale:

at the given scale, d.o.f looks fundamental! at higher scale, d.o.f only eff. variables (vevs)


macroscopic v.microscopic v.

f

What is a Dep. d’Estructura i Constituents de la Materia about?


40 orders of magnitude of research activities

Particle P. Nuclear P. Solide P Biology Astrophysics Cosmology

a few constituents, and many structures at the various scales,

m

• Introduction:

f

What is a Dep. d’Estructura i Constituents de la Materia about?



m

My research line

• Introduction:


f



m

My research linePhenomenology at ECM

Theory: Concha, Domenec, Joan, Joan, Sasha, (Jaume)Lhcb:Lluís, Eugeni, Graciano, Hugo, Ricardo, (David)

• Introduction:


f

• Introduction:



m

My research lineoverlap with Lattice QCD studies

from Assumpta & Àngels, Volodymyr


• The present picture: Standard Model (forces and constituents)


6 types of quarks and lepton

Our Modern Mendeleev’ Table

Type of forces:

(gravity) strong (QCD) weak em (QED)

SM

strong= large at low energy

ew= 1/137 small

• Flavour Physics:

Flavour Transitions: Weak interactions violate flavour: CKM matrix and CP violation


bc

W

VCKM

in

...

CKt LL

M bc V W L

CKMV

=>3 angles and 1 Phase

• Flavour Physics:



macroscopic picture(effective couplings after ewsb)

bc

W

VCKM

in

...

CKt LL

M bc V W L

• Flavour Physics: as probe of new fundamental interactions



bc

W

VCKM

microscopic picture?=>LHC job

(the ewsb mechanism?)

2 open options: Linear or Non-Linear Higgs realisation?

THDM SUSY

Techni C Little H. Extra D.

in

...

CKt LL

M bc V W L

• Flavour Physics: as probe of new fundamental interactions



bc

W

VCKM

microscopic picture?

• ad hoc description in the SM

1. not stable; 2.not fully investigated

(D )D

ewsb sector

H H V H H

ijL R

flavour sector

cY h.H

in

...

CKt LL

M bc V W L

• Future Challenge:


But already many exp. But already many exp. hints for physics hints for physics Beyond SMBeyond SM ::

gravity UV ~ 1016 TeV neutrino physics UV ~ 109 TeV (see-saw-leptog.) relic density WIMP 1 TeV, strong 1 TeV? matter/anti-matter asymmetries

and one big mystery left-over:and one big mystery left-over: THE ORIGIN OF THE MASS? HIGGS MECANISMTHE ORIGIN OF THE MASS? HIGGS MECANISM

1TeV

MZ

SM

MPlanck

109 TeV

Naturalness of Higgs sector would require n.o.f 1 TeV

The SM successfully describes phenomena to the Fermi scale, ~ 0.1 TeV => 10-17 m

Direct searches

Atlas and CMS;

indirect searches

MEG, LHCb, NA62;

Lepton, B, & K decays

to discover new particles at 1TeV to study flavour symmetries of n.d.f

Two main ways to unravel the naturalness of the Higgs sector

• Future Challenge: the origin of the Mass? the origin of the Mass?


1TeV

MZ

SM

MPlanck

109 TeV

Phenomenology of Quark Flavour Transitions

=>weak hadron decays in the SM and =>weak hadron decays in the SM and BSMBSM

• My research Activity:

strong= large at low energy.(non-perturbative method)

theoretical predictions plagued by hadronic uncertainties

KK KK xxs

L

˜ dR˜g̃

s

L

˜dR˜ g̃

Standard Model New Physics

Lattice QCDLattice QCD

K=sd

PhenomenologyPhenomenology

• Although no ``ab initio’’ limitations on the approach, limitations in computing resources introduce some approximations:

source of systematic errors.

Lattice QCDLattice QCD

lattice spacing a

lattice size L

quark field

gauge field

• Physical Quantities are computable from first principles, by tuning only the parameters appearing in the QCD Lagrangian, namely mq and s

• Green Functions => integrals of gauge and quark fields on a finite and discrete Box:

(x1) (x2) (x3) ∫ [d] (x1) (x2) (x3) e-S()

Studies with unquenched and light quark masses are now reliable, thanks to recent developments in both recent developments in both algorithms and new lattice actions.algorithms and new lattice actions.

Old-2001new

Time scalingTime scaling

QUENCHED QCD NF=0

seaqm

• Wilson: Luscher et al.-’05, m~280 MeV (NF=2)

• Twisted-mass: Boucaud et al.-‘06, m~280->250 MeV (NF=2 -> NF=2+1+1 ) • Clover: Lellouch et al.-’07, m~210 MEV (NF=2+1)

• Clover: PACS-CS-’07, m~190 MEV (NF=2+1)

• DomainWall: RBC-’07, m~300 MEV (NF=2+1)

• Staggered: MILC-2002, m~240 MeV ( NF=2+1 advanced studies)

Recent outstanding achievementsRecent outstanding achievements::Recent outstanding achievementsRecent outstanding achievements::

NF=2+1 ms + mu=md

seacm

The Wilson formulation of the lattice QCD action (standard up to 2002) did not allow to get m< 500 MeV**

**(physical m= 137 MeV)

BIG REVOLUTION! ChPt Logs

MareNostrum BlueGene BlueGene QCDOC APENEXT

(am

amq

(amamq

The theoretical calculation can be performed only numerically.

In order to achieve the required precision, about 1 billion of billions operations are necessary, corresponding to an integral over 50 millions degrees of freedom and to the inversion of

thousands of matrices with 100 millions of elements

Parallel super-computer (~1 Tflop)

MareNostrum

DETERMINATIONS of the CKM couplings ρ-η DETERMINATIONS of the CKM couplings ρ-η

LATTICE QCD calculations has allowed to reduce the relative hadronic uncertainty!

in L LtCKMU D WV

L

DETERMINATIONS of the CKM couplings ρ-η DETERMINATIONS of the CKM couplings ρ-η

LATTICE QCD calculations has allowed to reduce the relative hadronic uncertainty!

in L LtCKMU D WV

LMy contribution

ECM on lattice QCDECM on lattice QCD

QCD potential

QCD coupling const

Flavor physics

Nuclear Physics

Phase transition

Dynamical fermions

Assumpta

Joan

Domenec

MareNostrum

Nature is a funny mess!Nature is a funny mess!

• Conclusion


Nature is a funny mess!Nature is a funny mess!

• unravelling mechanism of nature involves many unravelling mechanism of nature involves many different research lines,different research lines,

• and a lot of expertiseand a lot of expertise Dep. ECMDep. ECM

glad to be hereglad to be here

• Conclusion


PhenomenologyPhenomenology

Potential n.d.f at the TeV scale must have a rather sophisticated flavour structure … which we have not clearly understood yet

NEW Physics

flavour facilities

Rare K decays:

• e.w loopse.w loops• highest CKM suppressionhighest CKM suppression• S=1 couplingS=1 coupling like like ’’ • very cleanvery clean like like sin2sin2

LFV

• zero in the SM

Lepton Universalityin K and B B rare Decays

Bd,sSM tree-level contribution SM tree-level contribution accessible to very high accessible to very high precisionprecision

BuBu

an appealing scenario is MFV at large tanHu< Hd>

Barenboim et al, ‘07

Present Constraints from Flavour Physics!high discriminating powers to specific Higgs sector extension

wide bibliography for each constraints in the plots


potential discovery modes from potential discovery modes from LHcbLHcb to to SuperBSuperB

B+ Bd,s l+l-

B+ D

K+

CC FCNC


Isidori,F.M., Paradisi, Temes ’07

FCNC amplitudes

c u u

BdsDv Buv KuvH+

exchange

Helicity suppressed

decays

Observables within 15% of theoretical uncertainties

ANTIMATTER

MATTER quarks

electron neutrino leptons

ANTIMATTER antiquarks positron antineutrinoantileptons

(visible) MATTER qqq proton BARYONS

ANTIMATTER qqq antiprotonANTIBARYONS

MESONS qq

strong= large at low energy~1GeV.

Direct searches

Atlas and CMS;

indirect searches

MEG, LHCb, NA62;

Lepton, B, & K decays

to discover new particles at 1TeV to study flavour symmetries of n.d.f

• Future Challenge: the origin of Mass? the origin of Mass?


THEORY EXPERIMENTTHEORY EXPERIMENT (QCD confined)(QCD confined)

•Once Upon a Time ~ 2000 yrs ago an economical description, consistent

to our “daily” observation;



Since then, better “effective” theories have been designed for the different regime of

Nature

• Introduction


Documents

Federico Mescia (RyC) Outline: a. Introduction b. Our present world picture: Standard Model c. the future challenge: (Flavour Physics in the LHC era) ECM