Linear collider muon detector: Linear collider muon detector: What’s new in Europe What’s new in Europe

Marcello PiccoloMarcello Piccolo

Arlington, Jan. 2003Arlington, Jan. 2003

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AgendaAgenda

ADVANCES (?)ADVANCES (?)Mainly simulationMainly simulation

tried version 3.0.6 for Brahms (thanks Ties)tried version 3.0.6 for Brahms (thanks Ties)Debugging stage almost overDebugging stage almost overCapability of writing hits files for calorimetry Capability of writing hits files for calorimetry

andand muon muon systemsystemwill try to integrate the two devices will try to integrate the two devices

R&DR&DBeam time allocated at Frascati (Three weeks )Beam time allocated at Frascati (Three weeks )

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The new Brahms releaseThe new Brahms release

The (Fortran) Code to full simulate the The (Fortran) Code to full simulate the Tesla detector has been upgraded:Tesla detector has been upgraded: W-Si calorimeter option has been implementedW-Si calorimeter option has been implemented Had Cal is based on the scintillator design.Had Cal is based on the scintillator design.

As of now it is possible to write a complete As of now it is possible to write a complete hit file containing:hit file containing: Tracking detectorsTracking detectors CalorimetersCalorimeters Muon detectorMuon detector

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The new Brahms release The new Brahms release (cont.)(cont.)

I tried to integrate a relevant number of I tried to integrate a relevant number of events in order to check performances and events in order to check performances and reproduce previous results.reproduce previous results.

My plans were to run ~10000 bb events My plans were to run ~10000 bb events and 10000 ZH events, but I was able to and 10000 ZH events, but I was able to simulate about 4000 bb events and 1000 simulate about 4000 bb events and 1000 ZH events.ZH events.

The complete package takes a couple of The complete package takes a couple of minutes/event on a P4/1.7GHz for the entire minutes/event on a P4/1.7GHz for the entire thing; a factor 4 less if one starts from a hit thing; a factor 4 less if one starts from a hit file and does only reconstruction.file and does only reconstruction.

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Single positive muon Single positive muon efficiencyefficiency

Comparison Comparison between the between the old simulation old simulation (open dots) (open dots) and the new and the new 3.0.6 one (full 3.0.6 one (full dots).dots).

Some hints of Some hints of non-optimized non-optimized matching can matching can be seen.be seen.

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Energy leakageEnergy leakage

Here too there seem to be discrepancies Here too there seem to be discrepancies between the two releases:between the two releases: The newer version seems to have smaller The newer version seems to have smaller

leakage into the muon filter.leakage into the muon filter. This statement has to be taken This statement has to be taken cum cum

granograno salissalis, as I did not have a chance , as I did not have a chance of looking at results in detail.of looking at results in detail.

Next meeting I’ll probably be able to Next meeting I’ll probably be able to say more on this issue.say more on this issue.

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Let’s now go to bb eventsLet’s now go to bb events

Here is the overall momentumHere is the overall momentum spectrum of the produced spectrum of the produced hadrons.hadrons.It is worth noticing the relativelyIt is worth noticing the relatively low momenta of the produced low momenta of the produced particles.particles.The average momentum is a bitThe average momentum is a bit less than 10 GeV/cless than 10 GeV/c

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Here are the overall results:Here are the overall results:bb events @500 GeVbb events @500 GeV

The four spectra refer to:The four spectra refer to:

Black: generated primary Black: generated primary particlesparticlesRed : generated Red : generated Green: identified Green: identified Blue : misidentified Blue : misidentified ~4000~4000evt’sevt’s

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Here are the overall results:Here are the overall results:ZH events @500 GeVZH events @500 GeV

The four spectra refer to:The four spectra refer to:

Black: generated primary Black: generated primary particlesparticlesRed : generated Red : generated Green: identified Green: identified Blue : misidentified Blue : misidentified 1000 evt’s1000 evt’s

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Some R&D points Some R&D points

There are few issues that need to be There are few issues that need to be addressed :addressed : RPC (either bakelite or glass) have to be RPC (either bakelite or glass) have to be

certified as rate capable.certified as rate capable. Gas mixes that grant to be neutron Gas mixes that grant to be neutron

transparent, especially for the end-caps transparent, especially for the end-caps have to be found.have to be found.

Working regimes have to be investigated in Working regimes have to be investigated in different rates environment.different rates environment.

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The Frascati The Frascati TTest est BBeam eam FFacilityacility

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Conceptual view of the Conceptual view of the facilityfacility

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Particle multiplicityParticle multiplicity

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In the coming monthsIn the coming months

Look deeper and (hopefully) understand Look deeper and (hopefully) understand the details of the new simulation tools.the details of the new simulation tools. Merge had-cal hits and muon hits to reduce Merge had-cal hits and muon hits to reduce

the muon detection threshold.the muon detection threshold. Start developing a swimming routine to Start developing a swimming routine to

follow penetrating tracks through the follow penetrating tracks through the different detector subsystems.different detector subsystems.

Start the R&D program on parallel plate Start the R&D program on parallel plate chambers at TBF in Frascati.chambers at TBF in Frascati.