Introduction

An apparent anomaly in the high-pT differential cross section at CDF (see references) has generated some interest in possible sources of "odd tracks" at the LHC.

Signatures

The various signatures for odd tracks consist of a few basic elements.

• kinks
• stubs
• intermittent hits
• anomalous curvature
• anomalous timing and/or dE/dx

However, some of these (kinks, anomalous curvature) could manifest in much simpler variables such as pT and could therefore be observable in inclusive measurements of differential cross section.

Data Samples

• min-bias?
• missing ET ("no mu")
• Data/MC at SLAC: /u/at/ahaas/nfs3/katie
• Data/MC at CERN: /u1/data/user.cmalone.data11_7TeV.00178109.physics_MinBias.merge.AOD.f351_m765/ ?(Data)   /u1/data/data10_7TeV.00152166.physics_MinBias.merge.NTUP_TRKVALID.r2045/ (Data)     /u1/data/user.cmalone.mc10_7TeV.105001.pythia_minbias.recon.AOD.e577_s1024_s946_r1926_tid215649_00/ (MC)

Tools

• AMI: https://ami.in2p3.fr/AMI/servlet/net.hep.atlas.Database.Bookkeeping.AMI.Servlet.Command?Converter=/AMIXmlToAMIProdHtml.xsl&Command=FormBrowseDatasetPerRun+-runNumber=178109
•  ATLAS Data Summary: https://atlas.web.cern.ch/Atlas/GROUPS/DATAPREPARATION/DataSummary/2011/
• ATLAS Run Query: http://atlas-runquery.cern.ch/query.py?q=find+run+178109+and+ready+%2F+show+all
• ATLAS Computing Workbook: https://twiki.cern.ch/twiki/bin/view/Atlas/WorkBook
• ATLAS Physics Workbook: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/PhysicsAnalysisWorkBook

References

• Odd Tracks at Hadron Colliders
• Measurement of Particle Production and Inclusive Differential Cross Sections in pbar{p} Collisions at sqrt{s}=1.96 TeV
• Erratum: Measurement of particle production and inclusive differential cross sections in pp? collisions at ?s=1.96??TeV
• PRELIMINARY: Unusual Energy Deposition, Timing, and Tracks.pdf

Contact

Andy Haas
Katie Malone
Tim Nelson