Muon Upgrade Simulations Status

Alexei Safonov

Texas A&M University

Muon Upgrade Goals

Muon upgrades aim to achieve the following: Sustain triggering at

current thresholds up to |h|=2.4

Increase offline muon identification coverage to |h|=3.5-4

Maintain existing envelope by preventing or addressing aging effects

Goal of these studies: Determine what kind of

detectors we need and optimize parameters

The “baseline” scenario since ECFA

Organization and People Muon TP editing group

Editor: Jay Hauser

Contact persons: Consolidation of existing detectors:

DT: Cristina Bedoya DT

CSC: Armando Lanaro

RPC: Gabriella Pugliese

Simulation: Anna Colaleo, Alexei Safonov

New detectors: Archana Sharma, Marcello Abbrescia

Electronics: Paul Aspell

Integration into CMS and infrastructure, costing: TBD

Twiki: https://twiki.cern.ch/twiki/bin/viewauth/CMS/HLLHCmuonPhase2

Simulation Goals Goals:

Quantify physics gains for each proposed element and groups of elements

Determine optimal detector parameters

Strategy: Implement all components

Write initial algorithms and evaluate performance

Optimize parameters Resolutions required,

number of layers etc

Converge on baseline scenarios

Deliverables

Trigger (focus on Level-1): Trigger efficiency and rates for viable scenarios

For standalone Level-1 muon trigger rate versus momentum and eta

Input for itegration of standalone L1 muon with track trigger

Offline (focus on muon extension to |h|=4): ME-0 stub reconstruction efficiency and fake rate Provide “global muons” with ME-0 in CMSSW for physics

studiesME-0 + forward pixel extension track

Iterate over possible detector parameter scenarios using POG-style variable

Software Integration Status

All components are there at the level of geometries in GEANT and digis

Work focusing on algorithm development and integration with other systems, dependent on status of other detectors: E.g. forward pixel extension needs to be ready to do ME-0 studies

Muon systems in GEANT Many thanks to Yanna, Sven, Marcello, Cesare and Slava for a lot of

hard work on implementing and validating the geometries in CMSSW

Critical Tasks and Manpower: ME-0

Deliverables: Global Muons for physics studies

Muon efficiency, resolution and fake rate for a suitably optimized detector

CMSSW Geometry: Close to being fully integrated

“Digi to global” chain is in progress Simplified implementation and the overall framework: Northeastern (Nash,

Trocino, Barberis) ~ 1.2 FTE, access to experts (M. Maggi, S. Krutelyov)

Some first results available, need to iterate with a realistic forward pixel extension setup

Studies critical for obtaining realistic results: Track re-fit with muon hits included - NEU

Neutron backgrounds estimation in FLUKA – TAMU-Qatar (A. Castaneda) ~0.2 FTE

Proper segment reconstruction: a small fraction of M. Maggi (Bari)

Short-living background estimation: TBD

Optimization of segmentation and design, e.g. extra absorber between layers

ME-0 Reconstruction Status

Plots use “emulated” stubs, but formats with full implementation version are similar, should be able to switch Once done, will automatically get punch through

backgrounds simulated (in GEANT)

Framework for global track+muon fit is mostly in place More work on optimization as pixel tracking

stabilized

Need to add neutron backgrounds

D. Nash

D. Troccino

Neutron Induced Backgrounds

Able to make new geometries in FLUKA and started shielding studies Preliminary estimates look hopeful: 100 kHz/cm2 is the worst ME-0 will

see

Improvements with shielding are possible

Some questions about including hits due to to e+e- Sensitivity measurements are ongoing (shoot electrons into GEM

chambers in GEANT) – T. Maerschalk and A. Magnani

The plan is to properly convolute sensitivities and fluxes vs energy For now use “magic numbers” for photon/neutron sensitivities from

RPC

A. Castaneda

Neutron Backgrounds in Digitizer Hits from long living

backgrounds added at the digitization step Updated rates for GE-1/1 and

GE-2/1 with updated geometries (long/short) are targeted for SLHC11

SLHC10 implied a simpler geometry, but this is a small difference

ME-0 hit rates are the highest, planned to be added in SLHC11 We may need to use custom

samples in the interim to properly estimate backgrounds for ME-0

R. Hadjiiska

Critical Tasks and Manpower: GE1/1 & 2/1

Deliverables: improved trigger performance, full offline reconstruction

Reconstruction in great good shape, no outstanding issues A strong team in place – INFN-Bari, TAMU and TAMU-Qatar, Ghent, Sofia,

Egypt, Saha

Remaining studies (not on critical path):

Custom reconstruction for high pT muons (C. Calabria, Archie Sharma, A. Colaleo, S. Krutleyov) and seeding with GEMs (R. Radogna with help of experts: S. Krutelyov, D. Trocino)

More critical remaining studies: Completion of the local trigger algorithm implementation – S. Dildick, S.

Krutelyov, A. Tatarinov, T. Huang, A. Safonov

Proper integration of new features into the full muon TrackFinder - J. Lee, K. Choi (Seoul) starting to interface with Muon TF people with help from experts (S. Dildick, S. Krutelyov, A.S.)

Integration with the L1 Track Trigger – S. Krutelyov, A. Schneider (TAMU)

Trigger: Overview

Critical piece for motivation

Redundancy and bending angle improve trigger

Many technical obstacles:

New upgraded L1 TF is not easily available

Focus on making “integrated” stubs to emulate improved redundancy, trick current CSC TF into taking these stubs and evaluate the improvement

Impact of Redundancy on Trigger

Implementation of a detailed algorithm is in progress Recover CSC stubs using added

redundancy of GEMs Can even improve the high eta

part not covered by GEMs Remove soft stubs (based on

bending angle) at lower eta

Urgent, but can’t happen overnight

Work in progress

RE-3/1 and 4/1 are on even more critical path: we can provide examples, but implementation is not trivial

Need people and need time to develop expertise

Very preliminary algorithm is there, need validation and improvements. Next steps: Replicate onto YE-2/1 Run through full system

with TF (J. Lee)

T. Huang, A. Tatarinov, S. Dildick

Critical Tasks and Manpower: RE3/1, 4/1

Deliverables: Introduce RE-3/1 and 4/1 into the trigger for improved performance

Evaluate performance and detector parameters (granularity and timing)

Geometry in CMSSW and digis: P. Verwilligen, I. Osborne, M. Maggi, L. Benucci

Tasks: Evaluation of background fluxes – S. Costantini; followed by integration for

digitization (R. Hadjiska)

Proper integration of digis into the full muon TrackFinder – technical implementation has many synergies with GE-1/1 and GE-2/1

Critical to make a physics case, but there is a lot of work and debugging that needs to happen there

Dedicated performance and detector optimization studies (timing and position resolution) – likely based on dimuon triggers and signals like rare B decays to pairs of muons, background reduction studies using improved timing (G. Grenier, S. Aly, A. Abdelalim, A. Ali)

Less critical items: Inclusion of recHits into the global reconstruction, fitting etc.

Summary The work building the case for Muon system

upgrades in Technical Proposal is under way Structure, people, understanding of the deliverables,

and a realistic plan to get them delivered is in place Shortage of qualified manpower is a definite issue, we

are taking it into consideration in planning our work

Critical issues: Full implementation of new components in the trigger

Dependent on other systems, i.e. there is no easy way to use upgraded L1 muon trigger

Falling back onto old trackfinder and implementing local trigger, make better stubs and feed them to the

Once POG-like elements are largely in, need to fully focus on physics-specific studies