Recoil Status

This is a working page which will continuously change. The content is not reviewed and is intended for people working on this specific topic.

Page maintainer: Caro

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Current

Status as of last Recoil Meeting: see below
Next PRC: spring 2010

Overview: topics, manpower and timelines for Recoil Physics Analysis

In case of questions and comments, please send an e-mail to Caro. Last update: 3.11.2009

12/2008

01/2009

02/2009

03/2009

04/2009

05/2009

06/2009

07/2009

08/2009

09/2009

10/2009

11/2009

12/2009

DVCS Dietmar

DVCS Jennifer

x

DVCS Sergey

x

DVCS Caro

x

(x)

x

Associated Charlotte

x

Associated Weilin

x

Exclusive Rhos Roberto

x

Exclusive Rho0 Sasha B.

x

Exclusive omega Bohdan.

x

Exclusive Rho- Witold.

x

Exclusive Pi0 Eduard

x

Exclusive Pi0 ?

Tagged SFs Andreas

x

Tagged SFs Alberto

x

RD flux factors Francesca

x

List of most important open technical points

Each topic has topic expert names assigned. This does not mean that no manpower is needed! Manpower is always welcome! If you are interested to contribute to one of these topics or you have other topics in mind please contact the Recoil group convenors (Andreas, Sergey).

Created: 01.10.2008

Last update: 22.11.2009

SSD - Andreas, Dietmar
- Refine calibration for low energy deposits - Andreas, Dietmar
- Efficiencies
  - Study proton/pion efficiency for outer sensors - Andreas
  - Study time dependence - Andreas
  - Optimize spacepoint cuts based on efficiencies - Andreas
  - Study influence of corrections (CM/spline/drift) on pion efficiency (necessity up for discussion)

SFT - Roberto, Weilin, Xianguo
- Calibration - Weilin (presently done, has to be checked after productions)
- Efficiencies
  - Final efficiency numbers for "good" quadrants - Roberto, Xianguo
  - Final statement on "broken" PMTs in outer layer, treatment of Quadrant 2 - Roberto, Xianguo
  - Implementation to xtc and checks - Xianguo
- TDC - Roberto (not finished yet, need manpower FTE)

PD - Charlotte, Alberto
- Calibration - Charlotte (presently done, has to be checked after productions)
- Efficiency- Charlotte
- PD tracking code- Charlotte, Alberto

Heavy gas contamination - Jennifer
- Studies are finished, see internal note Gas Contamination

PID - Weilin, Xianguo, Francesca, Caro
- PID studies for SFT, including overflow hits - Weilin
- PID studies for SSD - Xianguo
- Refine parent distribution based on existing parent distributions - Xianguo
- Test user friendliness of recoil PID library and make improvements
- Study track selection/ghost track rejection using recoil PID values (moved to analysis stage) - Sergey
- Study identification efficiency/contamination - Xianguo
  - For perfect tracks (4 SP)
  - For other tracks (3 SP)
  - Study influence of SFT overflow hits on MC PID - Xianguo
- Produce parent distributions for MC - Xianguo
- * Study necessity of flux factors - Francesca
- See also RDPID page

Detector efficiency - Andreas, Xianguo
- Create efficiency maps and code to access them

Monte Carlo - Friedrich, Xinguo, Andreas
- Recoil digitization implementations- Friedrich (presently done, new implementations possible by user request)
- How to implement inefficiency of outer SFT, Q2 into MC? - Andreas
- Data-MC comparisons of basic variables

Tracking - Sergey, Jonathan, Andreas, Alberto
- Study tracking efficiency for 2-spacepoint tracks, improvement of tracking efficiency - Sergey
- How to treat reconstructed momentum in stopped/non-stopped proton overlap region - Sergey
- How to add untracked spacepoints in inner SSD in analysis - Andreas, Alberto
- Corrections for passive material in front of inner and outer SSD sensors - Jonathan
- * Study of possibilities of tracking improvement using detector information (for example SFT ADC, TDC cuts) and PID (will not be implemented during tracking, can be used at analysis stage) - Sergey
- Final studies of track finding and fitting efficiency, ghost, clone track for all tracks categories - Sergey
- Refine passive material corrections - Jonathan

Known Features

(draft 24.4.2009 by CR, open for suggestions)

General

Quadrant 2: low efficiency in outer SFT (about half of Q2 affected)
Quadrant 2: SSD O2N dead

06e

Quadrant 1: SSD calibration improved
XTC improvements (M7), Talk by Sergey 22.4.2009
- M7: in search of 2SP, the spacepoints used in the 3SPs are not removed

07c

Quadrant 1: SSD calibration sub-optimum
M7: in search of 2SP, the spacepoints used in the 3SPs are removed
M7: momentum distribution for (Stopped)Proton hypothesis: unsmooth behavior at p=0.6 GeV/c (step). Fixed for all later productions.
M7: theta distribution shows gap at pi/2. Fixed for all later productions.

October 30, 2009

Minutes of Recoil Meeting October 30, 2009

September 8, 2009

Recoil status talk given by Andreas during collaboration meeting

July 20, 2009

Minutes of Recoil Meeting July 20, 2009

June 16, 2009

Recoil status talk given by Sergey during collaboration meeting

PRC May 5, 2009

April 22, 2009

Minutes of Recoil Meeting April 22, 2009

March 10, 2009

Recoil status talk given by Sergey during collaboration meeting

February 13, 2009

Minutes of Recoil Meeting Feb 13, 2009

November 3, 2008

Minutes of Recoil Meeting Nov 3, 2008

Current planned manpower distribution for Recoil analysis topics

DVCS BSA, BCA: Caro (from Jan. 2009 on), Sergey, Dietmar (from March 2009 on)
Associated production (DVCS): Charlotte, Weilin (Jan-March 2009, PostDoc?)
Exclusive rho Production: Roberto (Jan.-June 2009, PostDoc?), 2nd person?
Exclusive pi0 Production: Eduard, 2nd person?
Tagged Structure Functions: Andreas, Alberto

PRC October 1/2, 2008

Final collection of Recoil performance plots
HERMES talk open session
Web directory to collect plots for PRC
List of suggestions as of Aug 2, 2008: Recoil Plots for PRC Oct 2008

September 5, 2008

Mail sent out after Recoil Physics Week Sept 1-5, 2008

August 1, 2008

Minutes of Recoil Meeting August 1, 2008

SSD

the deuteron/triton mystery in the hydrogen data (Andreas)
uncertainty of energy calibration (Andreas)
efficiency

SFT

clarification of efficiency problem in Q2 (keyword: "6 semi-dead PMTs") (Roberto)
- Roberto's plots about the critical SFT quadrant Q2
- Is the drop seen in efficiency of Q2 real, or is it a software related problem?
- Use cluster or spacepoint level for efficiency studies?
define (from efficiency studies) and apply TDC cut on track level (in hrc production) (Roberto/Weilin)
data quality: define by hardware and proton/pion efficiency (vs. run) (Roberto/Weilin/Tibor)

PD

strip clustering (Alberto)
separation of tracked/untracked clusters (Charlotte)
energy reconstruction of photons and pizeros (acceptance) (Charlotte)

PID (proton/pion separation for higher momenta) (Hyon-Suk)
noise model (Hyon-Suk)
efficiency (Hyon-Suk)

Tracking

Misalignment (?) of Q1. Seems mainly to come from SFT internal alignment, but not 100% explainable by SFT-only (also SSD)
Ghost and clone tracks.
- Can we rely only on 4-spacepoint tracks? ==> those studies are all linked to physics studies
finalize "direct" DER method (Joanthan)
merge common tracking with DER (Sergey)

PID

Release of RD PIDlib, v1
When new MC available: compare parent distributions (the ones which enter RD PIDlib v1 were determined from real data) to MC

Monte Carlo

OFFICIAL physics production(s) needed with the same XTC flags that were used for 07c (keyword: preparation for PRC)
- Elke presently collects all pieces together, will make an hmc (and uDST writer) test and will then produce Pythia and gmc_DVCS productions

Physics Analysis

3 summer student projects are expected to be "seed and speed-up" of physics analysis: first look to exclusive processes with the new 07c production
Some recoil PhD students start working on recoil physics analysis in parallel (or soon)

More Notes

Kinematic fitting: ongoing discussion. Sergey plans to attack it after other commissioning points have been solved
Acceptance + efficiency (SSD&&SFT) for recoiling protons

July 2, 2008