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Simulations Required for Review Peter Jacobs, LBNL. Basis for EMCal physics case: Trigger: p 0 / g , e, jet Full jet reconstruction Gamma/pi0 discrimination Electron/hadron discrimination (neutron background) Need to assess impact of EMCal on key physics measurements

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Simulations required for review peter jacobs lbnl
Simulations Required for ReviewPeter Jacobs, LBNL

  • Basis for EMCal physics case:

    • Trigger: p0/g, e, jet

    • Full jet reconstruction

    • Gamma/pi0 discrimination

    • Electron/hadron discrimination

    • (neutron background)

  • Need to assess impact of EMCal on key physics measurements

    • not sufficient only to quote resolutions or background suppression factors

  • Need to assess impact of reduces acceptances (staging and “upgrade” scenarios)

An EMC for ALICE


Trigger
Trigger

  • p0/g trigger: PHOS technology in hand

    • no simulations needed of hardware performance (?)

  • Jet trigger: see talks by pmj and Chris

    • imho understood sufficiently except for HLT rejection performance (use offline reco to study)

  • Electrons: new topic, needs targeted study

    • some back of envelope calculations would help and may be all that is possible in time remaining

    • compare to other ALICE lepton measurements

      •  new manpower needed!

An EMC for ALICE


G p 0
g/p0

  • See Marco’s talk

  • need to incorporate cross sections, g/p0 ratio

  • estimate fragmentation photon contributions

An EMC for ALICE


Electron hadron discrimination
Electron/hadron discrimination

  • Role of EMCal in ALICE for electrons:

    • vs TRD?

    • in coincidence with TRD?

    • e-mu coincidence w/ muon arm?

  • No time before December to dig into this in detail

    • needs new effort

An EMC for ALICE


Full jet reconstruction
Full jet reconstruction

  • IMHO this is the centerpiece of the physics case for the EMCAL

  • Thus far there are detailed studies of specific response but afaik only partial assessment of physics performance

    • Need to assess finite resolution in light of physical spectrum

    • Need to assess effects of jet quenching

    • Varying background: p+p, minbias Pb+Pb, central Pb+Pb

    • Need to compare leading hadrons vs charged jets vs full jets (w/ EMCal)

An EMC for ALICE


Simulations required for review peter jacobs lbnl

A. Morsch, ECT talk Oct 05

?

An EMC for ALICE


Simulations required for review peter jacobs lbnl

physical

spectrum

Ereco/Ethrown

d-fn input

Ethrown

Not the clearest way to plot it , need to redo and expand…

An EMC for ALICE


Jet physics simulations
Jet physics simulations

  • TPC+EMCal response: use detailed geant w/ d-fn input parameterize

  • Throw physical distribution w/ parameterized response

  • Look at bias on parton energy distribution

    • Leading particle vs charged jets vs full jets

    • pp vs PbPbminbias vs PbPbcentral

    • quenching models

IMHO this issue is central to physics case: need to make signficant progress in next month

An EMC for ALICE


Reduced acceptance
Reduced acceptance

p0 etc: rate scales linearly with acceptance

Finite size jet patch: slightly more complicated but still geometric

No advantage to detailed simulations:

Tom should define the scenarios, then redo the simple acceptance calculations:

Full acceptance

An EMC for ALICE