Task A: ZEUS 2006-2007
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Task A: ZEUS 2006-2007. N. Brummer, L.S. Durkin, T.Y. Ling. O.S.U. History on ZEUS. Joined ZEUS 1985 One of U.S. ZEUS founding members. Designed and Built Optics for ZEUS Barrel Calorimeter. 87,000 Scintillator Tiles 5000 Wavelength-Shifter Light Guides and

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Task A: ZEUS 2006-2007

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Task a zeus 2006 2007

Task A: ZEUS 2006-2007

N. Brummer, L.S. Durkin,

T.Y. Ling


Task a zeus 2006 2007

O.S.U. History on ZEUS

Joined ZEUS 1985

One of U.S. ZEUS founding members

Designed and Built Optics

for ZEUS Barrel Calorimeter

87,000 Scintillator Tiles

5000 Wavelength-Shifter

Light Guides and

Correction Masks

Designed and Built FastClear

Trigger Processor

Fast (15sec) Cluster Finder

Electron Identification

Kinematic Variables E-PZ

Beam Gas Rejection

Manufactured Optics for

Barrel Calorimeter Presampler


Task a zeus 2006 2007

Group History on ZEUS (cont.)

Administrative

U.S. ZEUS Spokesman

3 Physics Coordinators

Run Coordinator

Trigger Coordinator

Post-Doctoral Fellows

B. Bylsma,C.L.Kim, C. Ginsburg,

N.Brummer K. McLean, B. Murray,

S. Park, I. Park, D. Acosta

Physics Chair Assoc. Prof. Assoc. Prof.

Korea U. Kyungpook U. U. of Florida

3 faculty Positions out of 9 postdocs !


Task a zeus 2006 2007

Background Problems fixed !

  • Synchrotron radiation fixed

  • e-gas decreased

  • p-gas decreased

HERA I (8 years) 193 pb-1

HERA II (2.5 years) 403 pb-1

  • New Data has Polarized Electron/Positrons

  • 4X increase in e-p Data


Task a zeus 2006 2007

Rate Increase: Fast Clear is now an Essential Component

  • Fast Calorimeter Cluster

  • Finding Trigger

  • E-Pz,PT, Beam Gas, Electron

  • Clusters, Jet Clusters

  • Abort fraction 20-30%

  • WWW run monitor written

  • Trigger works stably

  • Better Modeled in MC than

  • CFLT


Task a zeus 2006 2007

HERA Kinematics

30 GeV e±

900 GeV p

C.M. 315 GeV

centre-of-mass energy squared:

s = (k + p)2 = 4 Ee Ep

Q2 = -q2 = - (k – k‘)2 = s x y

four-momentum transfer

x = Q2 / (2Pq) Bjorken-x

momentum fraction of struck parton

y = (Pq)/(Pk) Inelasticity

relative energy transfer to the proton


Task a zeus 2006 2007

Physics with a Polarized Electron Beam

Standard Model

Neutral Current

left/right handed particles

interact unequally with Z0

Charged Current

left-handed particles only

HERA

Transverse Polarization

builds up naturally at HERA

(Sokolov-Ternov effect)

at HERA =30min

Paverage=40% (depol. effects)

The Cross section depends on polarization. One

Searches for e.g. WR and tests Standard model.

With one years data should be able

to set limit MW(R) < 400 GeV


Task a zeus 2006 2007

Charge Current Cross Section


Task a zeus 2006 2007

Charge Current Deep Inelastic Scattering


Task a zeus 2006 2007

HERA will shutdown forever June 30, 2007

FLMeasurement

HERA plans to run low-energy collision in 2007

460 GeV p 27.5 GeV e

Naïve Quark Model: Hadrons quarks have P(T)=0

QCD radiation introduces quark P(T)

Theoretical Predictions Vary Wildly


Task a zeus 2006 2007

In July we sent a note resigning from the ZEUS

Collaboration Effective December 2006

  • Decision a Finacial one, we did not have the funds

  • to support Nichol Brummer.

  • Collaboration begged us to stay on. The OSU Fast Clear

  • essential to low energy run (rejects 30% of background).

  • We agreed to stay on if one-shot money could be found to

  • cover Nichol’s Salary for 6 months.


Task a zeus 2006 2007

Trigger Summary – ZEUS Collaboration Meeting Plenary Session

FL, Low Energy testrun 59937

STD High Lumi

Loose NC DIS slots 37, 46

EmPzHi 30 GeV

Normal Run

Low Energy Run

  • 0: NC DIS RCAL

  • 1: NC DIS B/RCAL

  • 2: PHP

  • 3: CC

  • 4: EXO + misc

  • 5-8: B/F/Bac/R MU

  • 9: any MU

  • 10: random, calib, ‘passthrough’

  • 13: Abort/Accept=75%

  • 11: AbortCond/Accept=55%

  • Dominant FCLR Cuts

    • BG Cut

    • E-Pz >30 GeV

  • FL/Low energy running: FCLR very effective

    • FCLR can provide rejection factor 4.5, in stead of current factor 2.25!


Task a zeus 2006 2007

HERA’s Legacy


Task a zeus 2006 2007

The End


Task a zeus 2006 2007

O.S.U. Physics Analysis 2000-2006

Structure Function and High Q2

Camille Ginsburg (Physics Coordinator)

Contact Interactions

Jason Gilmore (Thesis)

Limits on Production of R-Parity Violating

SUSY particles

Nicole Brümmer

Spin-Dependence of Charged Current

Cross Sections

Albert Lee(Thesis), Nicole Brümmer


Task a zeus 2006 2007

Deep Inelastic Scattering

Neutral Current

Charged Current


Task a zeus 2006 2007

High Q2 NC/CC DIS Cross Section

  • Electroweak unification scale ~104 GeV2

  • At Q2>104 GeV2 NC=CC

  • Statistically limited at high x/high Q2

  • Cross sections sensitive to sea/valence quark

  • densities and electroweak parameters


Task a zeus 2006 2007

Nichol Brummer, SUSY-2005 Durham


Task a zeus 2006 2007

Physics with Polarized Beams

Standard Model

Neutral Current

left/right handed particles

interact unequally with Z0

Charged Current

left-handed particles only

HERA

Transverse Polarization

builds up naturally at HERA

(Sokolov-Ternov effect)

at HERA =30min

Paverage=40% (depol. effects)

The Cross section depends on polarization. One

Searches for e.g. WR and tests Standard model.

With one years data should be able

to set limit MW(R) < 400 GeV


Task a zeus 2006 2007

Future 2005-2007

ZEUS Operations will end in mid-2007

ZEUS has produced quality physics in the last fourteen years.

HERA has doubled our data sets in the last 1.5 year.

The Ohio State Group will continue to monitor and

maintain the ZEUS Fast Clear

With the new luminosity this group will continue to

study high Q2 high x physics and new Electron

Spin Physics


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