ecfa meeting-athensth. d. papadopoulou1 on behalf of the hellenic groups ntu athens/h 1 – univ. of...

ECFA Meeting-Athens Th. D. Papadopoulou1

On behalf of the Hellenic groupsNTU Athens/H1 – Univ. of

Aegean/ZEUSTheodora D. Papadopoulou

ECFA Meeting - Athens , October 10, 2008


Outline

Hellenic groups at HERA People and Activities Research Activities / Publications Research Budget Data Analysis Results Future Plans As an Epilogue


Greek groups at HERA

Group: University of Aegean - Chios

Members: Ioannis Gkialas

Kostas Papageorgiou , Post Doc

Group: National Technical University - Athens

Members: Theodora Papadopoulou

Ilias Panagoulias , PhD student

• About 2 – 3 Greek summer students/year


Research Activities/Publications

Group: University of Aegean - ChiosActivities: Data Analysis on FL measurement Z-vertex determination Data taking run shiftsPublications : 1 DAAD report , 1 Conf. paper & 1 publication under preparation

Group: National Technical University - AthensActivities : Data Analysis on Leptoquark search Data Analysis on LFV Validation on new software releases Data taking run shifts Publications : 2 Conference papers & 2 publications under preparation


Research budget

Group: University of Aegean - Chios

Research Budget:

• from HERA : ?

• from Aegean Un. : ?

• from EU + Greek projects: ?


Research Budget :

• from HERA : ~ 20,000 Euro for 2 years (2005 & 2008)

• from EU + Greek projects: ~ 40,000 Euro for 2 years

( PYTHAGORAS II: (2006-07) During 2008 : 0 Euro !


Remarks on Research budget


Research Budget :

from HERA : ~ 20,000 Euro for 2 years (2005 & 2008)

from EU + Greek projects: ~ 40,000 Euro for 2 years(2006-07)

( PYTHAGORAS II) During the year 2008 : 0 Euro !

Remark : financial support CERN vrs DESYfor hardware or for Physics projects on year 2008 :CERN : 0 financial support to our group !

DESY : 7 person-months financial support to our group


HERA I / HERA II

• World’s unique e p Accelerator

and Collider

• Operated 1992 -2007

• H1 & ZEUS each one have collected

0.5 fb ¹־ of high quality Physics

data balanced in e±

• 72 % of the Luminosity is from

HERA II longitudinally polarized

e± beams

• Polarization typically 30 – 40 %


“FL and Z-vertex measurements at HERA”

K. Papageorgiou, I. GkialasUniversity of the Aegean


• Width of distribution is due to proton bunch width, σ=110mm

•Some fraction of the recorded interactions are:

Electron in the nominal bunch interacting with a proton in a satellite bunch (+/- 72cm)

Proton in the nominal bunch interacting with a electron in a satellite bunch (+/- 30cm)

FITTING THE Z-VERTEX DISTRIBUTION : Physical Justification


LER DATA

LER MC

Nominal: Zvtx ~ 0.43 cm e- Satellite : ~2.1 %, p- Satellite : ~4 %

Fit with 5 Gaussians { nominal + e-satellite (+/- ~30cm) + p-satellite (+/-70cm) }

FIT OF THE RECONSTRUCTED LER DATA AND MC Z-VERTEX


MER DATA

MER MC

Fit with 5 Gaussians {nominal + e-satellite (+/- ~30cm) + p-satellite (+/-70cm) }

FIT OF THE RECONSTRUCTED MER DATA AND MC Z-VERTEX


MERLER

• Apply to MC Input: True Zvtx of MC Output: weight

• The routine is made such that normalization is kept between [-100,100] cm

RE-WEIGHTING ROUTINE


FL MEASUREMENT : Motivation & Method FL -- longitudinal SF, sizeable only at high y, observable at low x

-- FL=0 in QPM (spin ½ partons – Gallan-Gross),

-- proportional to gluon at higher orders, Direct sensitivity to gluon dynamics )]()1(8

316[

42

2

1

32 zzg

zxeF

zdzxaF

qq

x

sL

To separate F2 , FL w/o theory assumption , one needs to measure the cross section at fixed (x,Q2) and different values of y different beam energies (s)

)],(),([2)( 22

224

2

2

2

QxFYyQxFY

xQa

dxdQped

L

~ :reduced cross section


Low-x: visible differences between data sets

High-x: cross sections are consistent

Low-x: the x sections turn over

Reduced cross section measurement (ZEUS)


Results are consistent with FL from ZEUS JETS PDF’s

FL measurement (ZEUS)


“ Leptoquark searches and LFV ”

I. Panagoulias, Th. PapadopoulouNational Technical University of Athens


Leptoquarks at HERA

ep is the golden machine to study LQs

SEARCH FOR 1rst GENERATION LQs

BRW Model


Search for first generation LQs at HERA

From I.Panagoulias talk at DIS08 (London)


Search for first generation LQs at HERA


LQ limits in the BRW model


Comparison with LEP & Tevatron


Search for Lepton Flavor Violation LQs

Calculation of Limits is not finished for the 2nd and 3rd generation LQs


Greek teams are doing very interesting and important work at HERA on Measurements & Searches


The Greek teams will continue their responsibilities to complete Data Analysis from HERA and finish the papers under preparation We expect in the near future to continue this interesting physics

at LHeC !


HERA to LHeC : An Interesting Physics for near Future !

From the 1st CERN-ECFA LHeC Workshop

ecfa meeting-athensth. d. papadopoulou1 on behalf of the hellenic groups ntu athens/h 1 – univ. of...

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