# Presentation: 660837

## Summary of Physics Days and Top/EW Workshop – July ‘07

- Boaz Klima
- Fermilab

- All USCMS Meeting
- July 27, 2007

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## General  Comments

-  This talk is experimental – let us know if these kind of summaries are useful (educational, informing, big picture) or a waste of time (too general, substance-less, only for bureaucrats)
-  The idea is to give you a broad picture (biased, of course) of the status of Physics Commissioning effort as presented last week
-  Caveats
-  I am not an expert on any of these topics...
-  Since I have only limited amount of time, I will do justice to
-    nobody and no activity (sorry!)
-  These are basically my “online” notes... (“story”; few plots!)
-  Some problems/results have already been fixed/changed...
-  For technical details on any specific topic – go to the presentations at:
-  Physics Days - http://indico.cern.ch/conferenceDisplay.py?confId=14026
-  Top/EW Workshop - http://indico.cern.ch/conferenceDisplay.py?confId=17190
-  The bottom line as far as I see it is simple
-  Tremendous progress has been made – lots still need to be done
-  Many areas can use help – new people are needed now
- First (for me!) full week of terrific weather at Geneva (sunny, average temperature ~80 degrees, almost no rain)

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## 1-Day Top/EW Workshop

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## General Comments

-  I am not a member of any of these PAGs
-  25 people in 40-S2-A01 at the start (~10 joined later; down to 20 after lunch...)
-  9+2-0 were from the US at 40-S2-A01
-  No VRVS connections at the Intro talk (~10 joined later)
-  Communication (“VRVS”?) problems
-  Set up, audio, echo, disconnect, ... - bad!
-  Causing significant delays
-  Got to be fixed soon – making it really hard to communicate and make progress (many people around are frustrated)
-  Quoting Roberto’s summary:
-  Good news – almost every participant in the workshop made a contribution/presentation (lots of activities, nice progress)
-  Bad news – there were very few people out there who were “new” to these efforts (not attractive? Too technical? No discussion?)
-  Was it a workshop or a conference-like set of presentations?
-  Did the workshop accomplish its (publicized?) goals?

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Triggers & Skims (1)

-  Framework  and Skims for CSA07 (Steven Lowette)
-  Got disconnected (continued to talk for 10 minutes while we turned to the next talk...)
-  Framework (TQAF)
-  Motivation & Goals
-  Status & Plans
-  ~30 users already (help debugging & giving feedback)
-  Skims for the TOP PAG for CSA07
-  Ready; need to be thoroughly tested
-  Skim = HLT stream + AOD based cuts
-  MC production and Generator studies (Roberto Chierici)
-  Samples available and/or will be ready soon (CSA07)
-  ALPGEN is here
-  Beyond ALPGEN is being considered and worked on, e.g. MADGRAPH (in validation phase now)
-  Info available on the web (Twiki page)

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Triggers & Skims (2)

-  Trigger Studies (Javier Cuevas)
-  t-tbar & single top
-  Focus on lumi of 1032
-  Used samples simulated with CMSSW 1_3_1 and trigger code 1_3_1-hlt5 WITH TAGS (=hlt6)
-  Ready with tables of gazillions of triggers (one object or more) and their rates, efficiencies, overlaps, ...
-  Efficiencies comparing ALPGEN vs. TopRex (and good-old ORCA)
-  Preparing a new table for 1_6_0
-  EWK Skims (Nicola De Filippis)
-  10 streams split into of order 50 primary datasets at Tiers 0 & 1
-  Only ~25 for CSA07
-  Skims’ definitions are ready – need testing/studies
-  Everything documented on TWiki

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Top Physics – General & Category 1

-  Top - Intro (Jorgen D’Hondt)
-  Analyses in 6 different categories (quick re-establish, x-sec, mass,...)
-  One analysis (randomly selected?) will be taken all the way through to
-    a “paper” (“formal” review?)
-  This workshop
-  summarizes the work done over the last 6 months
-  gives indication of readiness for CSA07 and beyond
-  Top Category 1 - Early re-discovering Top
-  Dileptons
-  Using dileptons with leptonic selection – clean, easy
-  Track method – relax lepton cuts (pt, isolation) on 1(?) object
-  “Standard” (b-tag-less) – relax lepton cuts and add jets
-  Three methods defined as stringent, less stringent, and loose;
-   their acceptances are 10:16:32% (10%~20 events @10pb-1)
-  They now begin to test these methods on backgrounds...
-  Lepton + Jets
-  Selection looks pretty “stringent” (work in progress)
-  Once signal/background ratio is good (estimated with
-   no instrumental background to be ~22) use mass
-  Conclusion – first results look promising!

**combination with highest LR**

**with b-tagging tops are visible with**** less **
**than 1pb****-1**

**only slightly worse **
**without b-tagging**
**S (1pb****-1****) =16 (w) ****→ 9 (wo)**

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Top Physics – Categories 2-6

-  Top Category 2 – Top Cross Section Measurements
-  Lots of progress in understanding objects, especially in early days
-  Excluding acceptance, efficiency is “reasonable” (for dimuons ~70% ; ~85% per muon; lower for electrons, ’s are “in the works”)
-  Nice reality-check by Claudio on Dileptons (“TeV4LHC”)
-  Z  ee is less efficient than Z   by ~1/3
-  MET in Z   is worse than in Z  ee (puzzle!?)
-  Excluding Zs, Drell-Yan is still major source of background
-  Top Category 3 – Top Mass
-  Quality critically depends on ingredients...
-  Good-old likelihood is being studied and tuned
-  Top Category 4 – Top Differential Distributions, e.g. studies of mtt
-  Top Category 5 – JES via mass constraints
-  JES using kinematic fit, studies of dependency on resolutions
-  Francisco gave a nice talk on determination of JES using l+jets events
-  Top Category 6 – b-tag efficiency via flavor constraint
-  B-tagging in/for Top events (algorithms, methods to determine efficiency from data, use in Top analysis)
-  Uncertainties, mistag rates, early days approach (no energies; use angles), systematics, including backgrounds, ...

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Electroweak Physics

-  EW - Brief Intro (Roberto Tenchini)
-  Similar to Top in spirit
-  Electrons
-  Efficiency studies using Zs
-  Mis-identification and rejection
-  Efficiency & MET in We
-  Studies of forward Zs (rapidity dependence)
-  Nice pedagogical talk by Greg on studies of electron triggers (“TeV4LHC”)
-  First look at getting realistic efficiencies using data
-  HLT single object efficiency too low - Pixel match criteria too tight
-  Muons
-  Efficiency studies
-  Isolation
-  Detailed Z  studies (efficiency, loose selection, generator comparison)
-  Muons faking jets in QCD events
-  Taus
-  Status of  reconstruction
-  L1 triggers in EW events (Chi Nhan)
-  Status of Zh+e or h+ or e
-  Measuring efficiency and fake-rate from data

- Single 

- Double 

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Physics Days

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## General Comments

-  Physics Days” meetings (all plenary!) have been held on a ~monthly basis since the beginning of 2007
-  Jan. 17-18, 2007
-  Feb. 6-8, 2007
-  Feb. 26- Mar. 1 (CMS Week)
-  Mar. 27-29, 2007
-  Apr. 23-27, 2007 (Physics & Triggers)
-  May 22-24, 2007
-  June 18-20 (CMS Week)
-  The current structure of these meetings is roughly
-  Tuesday PM – Joint Offline/Physics
-  Wednesday – Joint Trigger/Physics
-  Thursday – Plenary Physics
-  The number of participants is relatively small (why?)
-  30-50 at 40-S2-A01 (10-15 from US)
-  0-15 VC connections (mostly individuals, including @CERN...)
-  The bottom line is:
-  Tremendous progress has been made – lots still need to be done
-  Many areas can use help – new people are needed now
-  Link to all talks (lots of important details!)
- http://indico.cern.ch/conferenceDisplay.py?confId=14026

**Lots of**

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Joint Offline/Physics (1)

-  Simulation (Daniel)
-  Readiness for CSA07
-  Geometry, Hits, Digi
-  Performance
-  Official chain: 144 (gene, simu) + 152(mixing, digi, reco)
-  Readiness for Day One (Data-Driven MC Simulation)
-  Software technical issues – improve reliability
-  Physics technical issues – DPGs now; should be POGs and PAGs, use TB and Cosmic data
-  New tools and new tasks “in the works” (GFlash, MC/Data overlap, Generators/Simulation interface,...)
-  Calibration & Alignment
-  Mis-alignment/Mis-calibration tools
-  Alignment/Calibration algorithms
-  Analysis Tools
-  AOD content & size (100 bb events in 152; ~200kB/ev; ECAL is ~1/3; ~300kB/ev w/ Sim; no single dominant collection)
-  Skims (specs, naming convention, validation – deadline commit 8/7)

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Joint Offline/Physics (2)

-  DPG Tests Planned for CSA07 (Darin)
-  Reminded us of CSA06 exercises
-  The goal is to expand the number of exercises and their realism
-  Automate wherever possible
-  Full use of DB in reconstruction
-  Use of CAF (requested 150 dedicated CPUs)
-  Examples: Tracker alignment, Muon alignment &
-    calibration, HCAL calibration, ECAL intercalibration
-  Mis-alignment and mis-calibration scenarios
-  Will use CMSSW version 152
-  Everything is Twiki-ed
-  Analysis Skims (Joe)
-  Goal is to make CSA07 look as real data-taking as possible
-  Skims are datasets useful for many analyses rather than one analysis
-  ~65 HLT bits will be split into ~15 datasets
-  They will be split into ~40 streams (>20% overlap)
-  First list of skims available for all POGs and PAGs
-  Will converge early in August for release 1_6_X

**10pb****-1**

**100pb****-1**

**Ideal**

- pT res. StandAlone – 100 GeV μ

- 

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Joint Offline/Physics (3)

-  Reconstruction
-  Reco for pre-CSA07 in summer (1_5_0)
-  Preparation for CSA07 in September (1_6_0)
-  New developments and test until the end of 2007 (1_7_0)
-  Recent developments
-  Major speedup in tracking and ECAL rehits
-  Significant development in JetMet, b-tagging, Tau ID, vertexing,
-   and Particle Flow
-  Successful deployment in 1_5_0
-  Specs for CSA07 Reco
-  500Mb/job memory & 25s/event CPU
-  Stability goal - <10-7/event crashes
-  ...reasonable performance of algorithms
-  FAQ for Physics analysis
-  Difference between releases
-  Which combinations of releases (Gen, Sim, Digi, Reco) are OK
-  Current schedule
-  1_6_0 release on Aug. 10 – start cycle now
-  1_7_0 cycle will start on Sept. 17

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Joint Trigger/Physics

-  Since many presentations were made recently about the “HLT Exercise” and its great success, I will limit myself to just a few general comments
-  Introduction (Wesley)
-  Next HLT Activities (regional unpacking for all detectors, optimization, menus, DQM, ...) - ready by October
-  Specific HLT algorithms’ goals
-  Validation, performance, ...
-  Questions (assignments?) to POGs & PAGs
-  Trigger Menu for CSA07 (Christos)
-  The HLT exercise is over (131HLT6 release, LHCC note, and party)
-  Trigger menu in 1_6_0
-  Prepare for online deployment
-  Trigger performance
-  Numerous reports on/from:
-  L1 emulator status
-  HLT Algorithms (Lenny, Meena)
-  Calibration & alignment triggers
-  PAGs feedback to HLT-exercise menu and plans for trigger performance
-  HLT: code in 160, trigger validation – POGs
-  Discussion

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Plenary Physics (1)

-  Particle flow and Tau ID
-  First visible progress since started ~6 months ago
-  New tracking strategy: more efficient, lower fake rate, faster
-  Tau algorithms (simple, PF-based, HLT) in place
-  Alexei replaced Anna as Tau sub-project co-convenor
-  Tracker DPG: Status and Plans
-  Commissioning goes well – FNAL plays an important role (DQM, reco)
-  High efficiency & low fake-rate
-  Simulation tuning – excellent agreement between data & MC
-  Lots of improvements in track reconstruction (eff, timing, ...)
-  Alignment strategy (progressing: MCSurveyCosmicsData)
-  e/: Status and Plans
-  Many improvements since 1_3_1
-  First fully functional Converted Photon algorithm is 1_5_0
-  Lots of studies on electrons & photon ID (inc. HLT)
-  Defined CSA07 skims

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Plenary Physics (2)

-  Summary of PhyStat07 @CERN (Bob)
-  Nice example to introduce the dilemma facing statistical statements
-  Making a decision (discovery?!) requires two subjective inputs
-  Prior probability
-  Utility function (risk assessment)
-  Pragmatism – hard to remain “pure” when introducing multiple systematics
-  A lot of accumulated experience taken from past & running experiments
-   and from world-renowned statisticians
-  Flat priors in multi-dimensions is dangerous
-  CMS & ATLAS Statistics groups working together
-  News: TMVA – a toolkit for multivariate data
-              analysis in ROOT
-  HCAL: Status and Plans (Mayda)
-  Consequences of:
-  Implementing realistic calibration constants (1_5_2)
-  Improving geometry and material budget (1_4_0)
-  Problems/things to work on:
-  Anomalously large signals from ’s and ’s in HF (“fake” deposits; .1[] to 1TeV[])
-  HCAL calibration triggers/producers to be used with other sub-detectors
-  Lots of progress – more to do; time to increase effort on commissioning

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## Plenary Physics (3)

-  ECAL: Status and Plans
-  Ongoing commissioning & Highlights from TB analysis
-  ECAL in TB07, CSA07 AND Simulation & Geometry
-  MUONS DT: Status and Plans
-  Progress on Barrel Wheel-commissioning data analysis; MTCC data recovery with latest CMSSW (1_5_2); Cosmic muon simulations
-  CSA07 (calib.& alignment dbases, exercises, ...)
-  Calibration/ alignment uncertainties with starting lumis of 10, 100 pb-1
-  Plans for upcoming CMSSW releases (1_6_0 & 1_7_0)
-  MUONS CSC: Status and Plans (Michael)
-  Lots of progress in many areas: unpacking and DIGIs, local reconstruction, improvements for HLT, code validation effort, geometry updates, calibration and simulation, alignment, data quality monitoring, detector performance studies, reprocessing the MTCC data, and studies of new data
-  Problems / self-criticisms
-  Commissioning: Status and Plans (Darin)
-  Pushing on 2 fronts: Testing individual components and testing integration
-  Showed list of activities & schedule AND set goals for global/Cosmic runs
-  Strong call to join in and make a difference
-  There were no general status reports from PAGs and some POGs

- All USCMS Meeting - July 27, 2007

- Boaz Klima

## (My) Conclusions

-  Tremendous progress has recently been made in Physics
-    Commissioning – lots still need to be done
-  Many areas can use help – new people are needed now
-  All info is available from the Agenda Server (talks & docs)
-    and/or from TWiki pages (docs & tutorials)
-  Too few of our CMS colleagues attend these meetings
-  The US participation is roughly proportional to its “weight”
-  The LPC contributions are helpful and visible – there
-    should be more of them
-  We are less than one year away from data-taking !!

- All USCMS Meeting - July 27, 2007

- Boaz Klima