# Presentation: 831367

## HCAL/JetMET Sataus #2

**Shuichi Kunori**
**U. of Maryland**
**08-Feb-2002**
**News**
**Simulation Group**
**Calibration & Monitoring Group**

**PRS: Physics Reconstruction and Selection**
**HCAL/JetsMET group**

## CMS Week

|  | PRS: HCAL/JetMET | Others |
| --- | --- | --- |
| Mon    900-1030 |  | HCAL PM |
|          1100-1800 |  | Plenary Opening |
| Tue     900-1030 | Calib/Monit - simulation work -    (Olga) | HCAL I&C, TRIG |
|          1100-1230 | Physics Obj                                 (Sasha) |  |
|          1400-1600 | PRS Muon | DAQ |
|          1600-1800 | PRS b/tau |  |
| Wed   900-1000 | Subgroup manager reprots             (sk) | Physics |
|          1030-1230 | DCS-PRS joint –calibrarion-  (Jim/Olga)  | Physics |
|          1400-1600 | PRS e/gamma | HCAL Elec/DCS |
|          1600-1800 | PRS JetMET                                       (sk) | HCAL IB |
| Thr     830-1230 |  | Plenary |
|          1400-1600 | Software                     (Salavat/Sunanda) | FB/MB/CB |
|          1600-1800 | - open for working session - |  |
| Fri      900-1230 | Joint with Physics group           (Sasha) |  |
|          1300-1400 | Subgroup manager (closed)            (sk) |  |
|          1400-1800 | Joint with Physics group           (Sasha) | CB |

## PRS Milestonesfor DAQ TDR HLT section

**New CMSIM/ORCA production is starting !**
**      ****for 1E34 (and 2E33) with GCALOR  **
**           ****and a new tracker geometry.**

## ROOT

**Event Database**
**CMS decided to move from Objectivity to ROOT/IO+********.**
**Event Analysis Tool**
**Lizard or ROOT**
**Current JetMET analysis uses PAW/Ntuple**
- Problem with PAW/ntuple
**Limited information (because of size limitation)**
**particles, towers, jets, met**
**Macro uses FORTRAN**
- Moving to ROOT
**Possibility to add more information- **
**Tracks, e/********, muons, ...**
**C++ based**
**smaller file size by compression.**
** ******** ****Jordan Damgov + Robert Lee, Hans Wenzel, Pal Hidas**
**Step 1)  Defining ROOT objects.**
**Step 2)  Implementation**

## Simulation group(Sunanda Banerjee)

**Full simulation**
**CMSIM/OSCAR implementation**
- Geometry                                                **(Sunanda Banerjee)**
- Photon production & propagation           **(Sunanda Banerjee)**
**HB/HE/HO**
- HF shower library                                    **(Victor Kolosov)**
**Verification**
- Tool - Standard histograms                    **(Shashi Dugad)**
**Basic / advanced**
- Hadron Shower                                       **(Sudeshna Banerjee)**
**Fast simulation**
- Calorimeter response                              (??? / Salavat / Pal)
- Physics objects – jets/met/tau                 (???)
**Test beam simulation**
**H2 PPP / Production wedges                       ****(Kajari Mazumdar)**
**Hanging file**
**Simulation software/production support**

## Calibration & Monitoring group(O.Kodolova)

**Test Beam and initial energy scale**
**Requirement for beam test / analysis / source**
**Response equalization ****(Uniformity + Dead Ch.)**
**Source/min-bias/in-situ**
**Time Dependence**
**Source/laser/LED/min-bias/in-situ**
**Data collection and maintenance**
**Data type / Data format / file system / database**
**Software Tools**
**ORCA Interface**
**JetMET energy scale**
**MC study / In-situ calibration**
**Synchronization**

**A.Yershov**
**A.Gribushin**
**H.Budd, D.Karmgard**
**(HE) (HO)**
**A.Krokhotine**
**K.Teplov**
**???**
**A.Gribushin**
**A.Yershov**
**(HB) (HE)(HO)**
**A.Oulianov**
**T.Kramer**
**A.Oulianov**
**S.Abdullin**
**I.Vardanyan**
**A.Kokhotine**
**P.Hidas**
**V.Konnopianikov**
**R.Vidal, ....**
**???**

## Calibration & MonitoringScenario (HB/HE)

**(same to HF)**

**a few times/day (?)**

****

****

## Test Beam

**Three Goals**
**Collecting calibration constants**
**Prototype of full system.**
- Establish a complete data flow and coordination among HCAL subgroups
**Operation of hardware**
**Analysis of calibration data and creation of calibration constants**
**Creation of the calibration database and maintenance**
**Interface to ORCA**
-  Define/clarify tasks and responsibilities
**3. Gain experience**

## In Situ Calibration(Physics Event Trigger)

**A) Min-bias events trigger**** **
**- estimation of pile-up energy.**
**- normalization within each eta-ring.**
**- isolated low E****T**** charged tracks**
**B) QCD Jet trigger (pre-scaled)**
**- normalization within each eta-ring**
**- normalization at the HB-HE-HF boundary**
**- test on uniformity over full ****h**** range.**
**- dijet balancing to normalize E****T**** scale in**
**  ****h ****rings. **
**C) tau trigger**
**- isolated high Et charged tracks (Et>30GeV)**
**D) muon trigger (isolated)**
**- good for monitoring.**
**- probably too small energy deposit for calibration.**

**2% accuracy**
**with 1k events**
**in HF**

## In Situ Calibration (2)

**E) 1 photon + 1 jet               ****(Victor Konopliniakov)**
**-  E****T**** Scale over full ****h**** range **
**   ****by photon-jet balancing**
**F) Z (-> ee, ******** ****) + 1 jet         ****(...)**
**- E****T**** Scale over full ****h**** range**
**  ****by  Z-jet balancing**
**G) Top trigger (1 lepton + jets + 2 b-tags)**
**- E****T****  scale by Mass(jj) for W in Top decay.**

**Not many new results since the HCAL TDR.**
**       ****E.Dorshkevich,V.Gavrilov (CMS Note 1999/038)    E) for HF**
**       ****Freeman & Wu (Fermilab-TM-1984)                         F), G)**
**Need better understanding of trigger requirements and**
**data streaming.**** **

## HLT Jets and Energy  Corrections

**Two steps for HLT jets**
- Find jets with R=0.5 –1.0 with fixed calorimeter weights.
- Correct energy scale to sharpen turn on curve.
**Energy Correction**
**Jet based**
- 1)   E = a x (EC+HC),          a depends on jet(ET,)
- 2)   E = a x EC + b x HC,     a, b depend on jet(ET,)
**Particle based**
- 3)   E = em + had      (requires to separate em/had clusters)
**     ****em  = a x EC   for e/******
**     ****had = b x EC + c x HC,  for had.     b (c) depend on EC (HC)**
**Use of reconstructed tracks**
- 4)   E = E0 + (Tracks swept away by 4T field)
- 5)   E = EC(e/+neutral) + HC(neutral) + Tracks

## Jet Response and Correction #1

**No pileup**

**With pileup**

**Et(corr)=a + b x E****T****(rec) + c x E****T****(rec)****2**

**Et-eta dependent correction for QCD jets**

**L1:  1.73 E****T****1/2**** + 0.03**

## Jet Energy Correction #5Use of Reconstructed Tracks

## Jet Energy Correction #5Resolution & Linearity

**(Irina, Olga + Sasha, Dan)**

## Summary

**Simulation group**
**Moving from CMSIM to OSCAR**
**Validation**
**Calibration & Monitoring group**
**Collection and maintenance of calib. data**
- Clarify tasks/responsibilies for operation, analysis, collection, maintenance etc.
- Use test beam as a prototype of full system.
**In-situ calibration**
- Need better understanding of trigger requirements and data streaming.
**Energy scale and resolution**
- 5 levels of jet correction methods have been tried.
**Method #5 will be implemented in ORCA.**
**Algorithm for event-by-event subtraction of pile-up energy has been (almost) implemented in ORCA.**
****** ****Those will be tested with some physics channels.**