Open and Hidden Charm Open and Hidden Charm Production Production in 920 GeV Proton-Nucleus in 920 GeV Proton-Nucleus Collisions Collisions Ulrich Husemann for the HERA-B Collaboration Experimentelle Teilchenphysik, Universität Siegen 6 th International Conference on Hyperons, Charm & Beauty Hadrons Illinois Institute of Technology, Chicago, IL, June 27 - July 3, 2004
21
Embed
Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions Ulrich Husemann for the HERA-B Collaboration Experimentelle Teilchenphysik, Universität.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Open and Hidden Charm ProductionOpen and Hidden Charm Productionin 920 GeV Proton-Nucleus Collisionsin 920 GeV Proton-Nucleus Collisions
Ulrich Husemann
for the HERA-B Collaboration
Experimentelle Teilchenphysik, Universität Siegen
6th International Conference on Hyperons, Charm & Beauty HadronsIllinois Institute of Technology, Chicago, IL, June 27 - July 3, 2004
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 2
Outline of the TalkOutline of the Talk
HERA-B detector and trigger systems
Charmonium production
Open charm production
Summary
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 3
Detector & Trigger
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 4
10 m
The HERA-B DetectorThe HERA-B Detector
Magnet
Muon Detector4 layers of gas pixel
chambers (inner) and MWPC with cathode pad
readout (outer), pad-coincidence pretrigger
0 m20 m
Top View
920 GeV/c Protons
Inner / Outer Tracker7 layers of GEM-MSGCs (inner) and honeycomb drift chambers (outer)
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 5
The Dilepton TriggerThe Dilepton Trigger
HERA-B detector: data is read out and buffered for 10 s(proton bunches cross every 96 ns, 0.5 interactions/BX)
Pretriggers: ECAL cluster or hit coincidence in muon detector as trigger seed (custom hardware)
5 MHz
First Level Trigger (FLT): Track trigger in hardware using tracking detectors behind magnet, seeding by pretriggers
3 MHz
Second Level Trigger (SLT): FLT tracking confirmed, extrapolation to vertex detector, vertex fit (PC farm)
20 kHz
100 Hz
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 6
Data-taking period: October 2002–February 2003 Dilepton trigger: require 2 electrons or muons
– Trigger performance: >1,000 J/ per hour
– Sample for charmonium studies:• 300,000 J/
• 10,000 c
• 3,500 (2S)
– Study of beauty production see talk by H. Wahlberg, B3.8
Minimum bias trigger: minimum activity in RICH/ECAL– 200 million events recorded– Strangeness and hyperon production– Pentaquark searches see talk by A. Sbrizzi, ST.3– Open charm production
Data Sample 2002/2003Data Sample 2002/2003
U. Husemann, Univ. Siegen: Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions 7