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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
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Matter and Standard ModelMatter and Standard Model
p=(uud)
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hermes(e-A fixed target)
H1 ZEUS
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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
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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
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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
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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)
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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]
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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
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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
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Di-Jet measurementsDi-Jet measurements
DIS’ 06, 20 / 04 / 06
Fit αS(MZ) in each (Q2, ET) binusing NLO calculations.
confinement
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Strong coupling measurements Strong coupling measurements at HERAat HERA
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Heavy Flavour meaurementsHeavy Flavour meaurements
● Excellent tracking (including silicon detectors)
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Charm and beauty components Charm and beauty components of the protonof the proton
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Hard DiffractionHard Diffraction
recently also measured in CC
colorless object
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Spectacular eventsSpectacular events
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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
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Excited fermions: neutrino*Excited fermions: neutrino*
● Compositness scale Λ, internal dynamics stored in f,f',fs couplings
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HERA and the next generation: LHCHERA and the next generation: LHC
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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...
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LheC e(70 GeV) x p(7 TeV) LheC e(70 GeV) x p(7 TeV)
ramane de vazut....
LHeC
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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