Programul HERA la DESYProgramul HERA la DESYPrezent si perspectivePrezent si perspective

Cristinel DIACONU

Centre de Physique des Particules deMarseille

● HERA● Deep Inelastic Scattering and Electroweak phyiscs● QCD: the next challlenge● Searches in ep collisions● Next high energy DIS experiments● Conclusions

Matter and Standard ModelMatter and Standard Model

p=(uud)

Acum 22 ani

hermes(e-A fixed target)

H1 ZEUS

Colliders at Fermi ScaleColliders at Fermi Scale

LEP TEVATRON

HERA-> e+e- collider(2000)Ecm=90-209 GeVLumi=900 pb-1/exp.(phys)ALEPH,DELPHIL3,OPAL

-> e±p colliderEcm=320 GeVH1, ZEUSHERA I 120 pb-1/expt(phys.)HERA II 2007 ->700 pb-1(delivered,e±,±Pe)

FERMILAB

DESY

e

e p

p

-> pp collider: CDF, D0

Run I Ecm=1.8 TeV 130 pb-1/exp.(phys.)

Run II Ecm=1.96 TeV 1fb-1 delivered2009 -> 4-8 fb-1

Many other interesting results from lower energy facilities

SLC: polarized e+e-

at Z peak

Polarisedleptons

03­04

05

98­99

99­00

94­97

HERAHERA

H1

Unique e(27 GeV) p(920 GeV) collider, Ecm=320 GeV

2 collider experiments H1 and ZEUS, HERMES(fixed target)

HERA I (1994-2000 ): for physics ~120 pb-1 /experiment

HERA II (since 2003): polarized e-beam in collision

L(HERA II): e±p (phys.): 100 pb-1

e± polarization: 25-40%

2007: 700 pb-1 delivered

H1

ZEUS

HERMES

Deep Inelastic scatteringDeep Inelastic scattering

Investigate proton structure (quarks mass-less, but Mp~1 GeV)“mass of the universe?”

Study phenomena from e-quark contact

DIS at HERADIS at HERA

Q2 ~ M2W,Z (EW regime)

HERA I data

rquark<10-18m“p”/1000

ZEUS

H1

NC

CC

Charged Current (CC)

Neutral Current (NC)

Proton structure and EW effects from DISProton structure and EW effects from DIS

boson virtuality

quark p momentum fraction

inelasticity

CC NC

HERA experiments constrain parton distributionsCC [pure weak process] => resolve quark flavoursNC also sensitive to electroweak effects at high Q2

[example of decomposition]

Light quarks couplings to the ZLight quarks couplings to the Z● b,c couplings very well known (few % LEP

from AFB(c,b))● Light quarks (u,d) couplings determination

– HERA: eq->eq Combined fit Z couplings + PDF

– LEP : ee-->qq at Z peak (a2v2, a2+v2)

– TEVATRON: qq->ee from Drell-Yan (electrons) AFB

HERA II results with polarized beamsHERA II results with polarized beams

CC: linear dependence established in DIS at HERA

Compatible with V-A structure (no RH currents)

HERA can run with e± and both e-beam polarisations (P=0.25-0.4)

-

CHARM (1979):νµ Ν→µX

Di-Jet measurementsDi-Jet measurements

DIS’ 06, 20 / 04 / 06

Fit αS(MZ) in each (Q2, ET) binusing NLO calculations.

confinement

Strong coupling measurements Strong coupling measurements at HERAat HERA

Heavy Flavour meaurementsHeavy Flavour meaurements

● Excellent tracking (including silicon detectors)

Charm and beauty components Charm and beauty components of the protonof the proton

Hard DiffractionHard Diffraction

recently also measured in CC

colorless object

Spectacular eventsSpectacular events

Spectacular events at HERASpectacular events at HERA

Multi-electron event

Tau pair produced in photon-photon collision

New Physics may appear in remote corners of the SM:Investigate Rare Topologies

Excited fermions: neutrino*Excited fermions: neutrino*

● Compositness scale Λ, internal dynamics stored in f,f',fs couplings

HERA and the next generation: LHCHERA and the next generation: LHC

Next collider experiments at large energy?Next collider experiments at large energy?

Murray Gell-Mann, Rochester Conference, 1966

Abdus Salam, Rochester Conference, 1976

(from Max Klein, Summary DIS2006, Tsukuba)

LHC (pp) && ILC(ee) but...

LheC e(70 GeV) x p(7 TeV) LheC e(70 GeV) x p(7 TeV)

ramane de vazut....

LHeC

H1H1

● Experimentul H1:– ~320 fizicieni, 40 institute, 18 tari, Spokesman: Max Klein (->Claude Vallee)

● inca 2 institute vor fi acceptate in iunie 2006: Belgrad si Ulan Bator ● In prezent

– timing excellent (majoritatea datelor cu detectorul complet si optimal vor fi colectate in 2006/2007)

● SEZONUL DE PUBLICATII !– Stagiu pe date reale, pregatirea studentilor/cercetatorilor pentru LHC

– Mediul de analiza de date este relevant pentru LHC (Root/C++, ferma batch, activitati GRID)

– Cunoasterea structurii protonului si a QCD este cruciala pentru rezultatele de la LHC