# Presentation: 510297

## Current limitations and prospects for future results

*  *Common problems/issues
-   Physics related problems
-   Object-ID related problems
-   Room for improvement
-   Results expected for summer

## General

- Better understanding of all objects
- Object identification criteria  (jets, missing ET, electrons, muons, photons, tracking, primary vertex) are better optimized  for physics analyses compared to p13 version
- While systematic errors on object IDs (e.g. JES, luminosity) are still big, they are smaller compared to p13 version
- Luminosity calculations centralized
- Gained from trigger optimization

- We have much better results with p14 data. Thanks to all who worked on p14 so hard!

## Common problems

**Lack of manpower** – *why?!  We have ~700 members in our collaboration, and every group in the experiment needs more people!*
**Late data arrival**
*a lot of continuous work to put everything together in D0reco*
**MC production***** ***–* *insufficient statistics
*for many background studies;*
*for systematic checks (fragmentation models, event modeling)*
**Computing resources overloaded*** – needed to reprocess/analyze data*

## General physics related problems

**Late object-ID certification**
*depletion of manpower with data arrival;*
*little discussion with algorithms groups on final choice of object ID in physics analyses *
**A lot of duplicated efforts in physics groups:**
*trigger turn-on curves;*
*high-pT lepton efficiency measurements*

## Limitations for physics analyses

**Jet ID/JES (WZ, Higgs, NP, QCD):**
*big error on data/MC JES corrections (especially for high ****, p**T** of jets);*
*need JES for low energies of jets;*
*need JES as a function of EM fraction;*
*jet p**T** resolution much worse compared to Run I;*
*non-uniform response of calorimeter in ****  has to be understood;*
*with current calorimeter resolution lose a lot of statistical power from W sample;*

**Even if we reduce JES error to Run I level, still it will remain the source of largest systematic error.**

## Limitations for physics analyses

**Electron/Photon ID (WZ, Higgs, NP, HF):**
*need certified performance for photons with p**T** ****1 GeV;*
*fix ****-dependence of calorimeter response;*
**MET (WZ, NP)**
*need to understand unclustered energy*
**Data Processing (all groups):**
*Many skims are large (bMU, some Higgs skims, ****-in-jet B-ID) – difficult to analyze/reprocess them with improved object IDs;*
**Data quality**
*to be continuously improved*** **

## Limitations for physics analyses

**Tracking/Vertexing (WZ, Higgs, NP, HF, b-id):**
*reconstruction inefficiency for high-p**T** electrons;*
*no work on bremsstrahlung;*
*charge mis-measurement different between MC and data;*
*better understanding of p**T** resolution for high-p**T** tracks; *
*vertex/beamspot-constraint refit of tracks;*
*inefficiency in tracking in jets;*
*reconstruction inefficiency for low-p**T** tracks and tracks with big DCA with standard reconstruction -  need reprocess big samples with extended tracking;*
*fix material and magnetic field in reco to get masses right*

## Limitations on limitations – general object ID problems

| Problems  | Suggestions/solutions |
| --- | --- |
| Certification: need to converge with physics groups on what has to be provided by each object ID group | Better communication with physics groups |
| Data availability: all groups need a lot of statistics to derive proper object ID | Need one month prior certification deadline |
| Manpower: Many people who worked on object IDs moved to their analyses before certifications were completed. | Establish at least one month gap in between certification and analyses deadlines |
| JES and b-ID: can be done only after the certification of “input” objects. | This gap should start after  these two groups will finish |

**Situation should be better for summer conferences since reco version is stable and we do not expect big delays with data, have time to attack problems at lower level**

## Room for improvement

**JES:** have detailed plan on how to improve JES error, specifically showering uncertainty.
**Electron/photon ID:** plan to use CPS information (was lost during the first pass of TMB fixing);
**MET:** upgrade MissingET package, all tools to minimize the data rejection and to analyze reasons are in place;
**Muon:** a lot of useful work is done already by rather isolated groups of people – need to improve the coordination of efforts;
**Tracking/vertexing:** have started material, post-shutdown alignment studies, working on improvement of the primary vertex reconstruction.

## Actions for improvement

- February   Establish 90% running efficiency; Add hits to P14 TMB
-                   Certify reprocessing including tracking using new TMB
- March     MC submission automated using RUNJOB, SAM-GRID, and RTE
-                Automate data quality using P14 RECOCERT
-                210 pb-1 available for analysis with T42 (P14 RECO)
-                New material and alignment in RECO / simulation test release
- April       STT fully commissioned;  New photon ID in RECO test release
-                Submission of first papers with 210 pb-1
- May        FPD detector and trigger fully commissioned;
-                 Significantly reduce bad or questionable luminosity blocks.
-                Establish capability to process 50M real data events / week
- June       300 pb-1 available for analysis (P14 RECO);
-               D0mino reduced to 64 processors; Remote reconstruction available;
-               P17 on farms
- July       Trigger & Filter Version 14 running on-line

## Prospects for future results

**Top group:**.
-      Summer:
- improve precision of ttbar production cross section measurement  both topological and b-tagging;
- single top;
- top mass;
- W helicity;
- top decay studies;
- ttbar resonances;
- top pT spectrum

**New Phenomena:**
- Extra dimensions;
- Dilepton resonances;
- 1st and 2nd generations of LQ;
- single LQ production;
- LQ in the ν ν jj channel;
- GMSB in γγ+MET channel;
- SUSY trileptons;
- RPV;
- Stop in e channel;
- Stop/sbottom;
- Squarks/gluinos;
- Monojets

## Prospects for future results

**WZ group:**
- Summer:
- WZ trileptons;
- Direct measurement of W width;
- Lepton charge asymmetry;
- Studies of Z production properties

**Higgs group:**
- W/Z + dijet/bb cross section measurements;
- WW→ dileptons cross-section measurements;
- H → WW’ → dileptons  limit;
- Doubly charged Higgs decaying into 4 leptons;
- bh/bbh (→bb) analysis;
- H→γγ

## Prospects for future results

**HF group:**
- Summer:
- Bd mixing;
- Charmonium production;
- Limits on Bs→;
- Branching fractions for Bd →D**ν;
- B** signal

**QCD group:**
- Inclusive jet pT spectrum production;
- Dijet mass cross-section measurements;
-  between jets;
- Dijet angular distribution;
- High pT b-jets;
- Diffractive Z;
- Diffractive jets using FPD.

## Summary

- Significant improvement in understanding data;
- A lot of impressive physics results with current data;
- For further improvements, our list-to-do is well defined;
- It is not too big;
- Need dedicated people to accomplish it;
- Better organization/communication between algorithms/physics group;
- Summer will bring us even more and better physics results