Tracking

Drew Alton

University of Michigan

vs vs

vs pT vs Q

vs tick vs Ntrk

P14 Tracking

Promised better tracking Bump hunting Efficiency Resolutions

We still need some improvements

# hits/Track 2 for tracks Mass locations…tuning

material/magnetic field

Must run faster and more reliably

A look at reco-cloggers

Highlights of the many bumps we have

p+

0

multiple tracks with ~cm impact parameters

DØ Run II Preliminary

= 114 pb-

1

Z Peak

Nice Z peak. Note that the

resolution improvement is dramatic

Impact Parameter

The IP resolution is within 10% of expectations.

Tracking Efficiency

Track Match Efficiency in Zee Spatial

CC 0.895+-0.009 EC 0.779+-0.029

Spatial +E/p CC 0.808+-0.013 EC Same…no E/p

Can Forward tracking be improved using FPS MIP layer?

Image of HDI from γ-conversions

6-chip SMT HDI

SMTCFT

X, cm

Y, cm

HV cap

Timing

It’s not perfect

Z->ee track comparison between data/MC

As you can see the number of hits doesn’t agree between data and Monte Carlo.

The 2 distribution in data is wider and has a long tail.

Mass

The mass of the J/ is about 1/3 of a sigma low

Most peaks have similar issues

Currently there is work in the tracking group to understand how to separate effects from material and magnetic field.

mass fromEM clusters

mass fromtracks

Reco-Cloggers

These events were identified on the farms by Mike Diesburg and named by Tom Diehl.

They run forever…eventually Mike kills them

Crossing Dependence

The distribution of RC events seems to depend on crossing number.

The CFT has a crossing dependence to it’s pedestal mean (random channel)

Crossing Dep. of RC

-5

0

5

10

15

20

25

1 2 3 4 5 6 7 8 9 10 11 12

Crossing # / Superbunch

Nu

mb

er o

f R

C e

ven

ts

Improvements

P14.04

Full d0reco

P14.04 + p14.05 tracking

Full d0reco

Timing

(GHz s/event)

64.8 (CPU)

135.0 (real)

43.0 (CPU)

43.4 (real)

Memory (vmem)

2GB 650MB

Tracking in p14.05 is supposed to mitigate Removes “crumbling” clusters On a file from run 179934 (46e30) (3k events) on CAB

Historic Reminders

About two years ago we had SMT+

A year ago we had tracking

efficiencies 45-65 %. now we’re in the 90’s for high pt and isolated. Where will we be next year? Mike and Flera have a list of projects…see

http://www-d0.fnal.gov/global_tracking/projects/active.html