Spin PWG

This is a feed of Drupal items targeting the "Spin" Audience.

Di-jet A_LL analysis update

Speaker : Tai


Talk time : 15:10, Duration : 00:20

Upcoming Conferences

Speaker : Akio/Bernd


Talk time : 15:00, Duration : 00:10

http://www.star.bnl.gov/protected/spin/spin/Conferences.html

Spin PWG

-00-00
Thursday, 1 January 1970
, at 00:00 (GMT), duration : 00:00
TimeTalkPresenter
15:00Upcoming Conferences ( 00:10 ) 0 filesAkio/Bernd
15:10Di-jet A_LL analysis update ( 00:20 ) 1 fileTai
15:30Run6 Production Status & QA ( 00:20 ) 0 filesIssam
15:50Di-jet Sivers paper ( 00:20 ) 0 filesJan
16:10Spin Document for Long Range Planning ( 00:20 ) 0 filesAkio/Bernd

SPIN 2006 Preliminary Result

2006 di-jet Sivers PRL paper

Measurement of Transverse Single-Spin Asymmetries for Di-Jet Production in Proton-Proton Collisions at sqrt(s) of 200 GeV
Target Journal: PRL

Single Spin Asymmetries by Fill

Away-side only

BJP1 (hardware & software & geometric) requirement, only use pions with dR > 1.5

Asymmetries for near-side and away-side pions

Summary:
I associated charged pions from JP2 events with the jets that were found in these events. If a jet satisfied a set of cuts (including the geometric cut to exclude non-trigger jets), I calculated a deltaR from this jet for each pion in my sample. Then I split up my sample into near-side and away-side pions and calculate an asymmetry for both samples.

Run 5

Charged Hadrons

Speaker : Adam Kocoloski ( MIT )


Talk time : 13:15, Duration : 00:45

First Look at Charged Pion Trigger Bias

Motivation:
The charged pion A_LL analysis selects pions from events triggered by the EMC. This analysis attempts to estimate the systematic bias introduced by that selection.

Conditions:

  • Simulation files, database timestamps, and selection cuts are the same as the ones used in the 2005 Charged Pion Data / Simulation Comparison
  • Polarized PDFs are incorporated into simulation via the framework used by the jet group. In particular, only GRSV-std is used as input, since LO versions of the other scenarios were not available at the time.
  • Errors on A_LL are calculated according to Jim Sowinski's recipe.


Plots:


Conclusion:
The BBC trigger has a negligible effect on the asymmetries, affirming its use as a "minimum-bias" trigger. The EMC triggers introduce a positive bias of as much as 1.0% in both asymmetries. The positive bias is more consistent in JP2; the HT2 asymmetries are all over the map.

Spin Parallel Session

TimeTalkPresenter
09:00Inclusive jets ( 01:30 ) 1 fileJet group
10:30Inclusive pi0 - BEMC ( 00:45 ) 1 fileFrank Simon (MIT)
11:15Coffee Break ( 00:15 ) 0 files (MIT)
11:30Inclusive pi0 - EEMC ( 00:45 ) 0 filesJason Webb (Valparaiso)
12:15Lunch ( 01:00 ) 0 files (Valparaiso)
13:15Charged Hadrons ( 00:45 ) 1 fileAdam Kocoloski (MIT)
14:00Di-jets/Di-hadrons - ALL ( 00:45 ) 1 fileTai Sakuma (MIT)
14:45Coffee Break ( 00:15 ) 0 files (MIT)
15:00Di-jets - Sivers ( 01:00 ) 1 fileJan Balewski (IUCF)
16:00Lambda ( 00:45 ) 1 fileQinghua (LBL)
16:45Coffee Break ( 00:15 ) 0 files (LBL)
17:00Relative Luminosity ( 00:30 ) 1 fileTai Sakuma (MIT)
17:30Production ( 00:15 ) 0 filesAll (MIT)
17:452006 Analysis topics / Analysis tools ( 00:45 ) 0 filesAll (various)

Spin Plenary Session

TimeTalkPresenter
14:00Keynote: Spin Physics ( 01:00 ) 0 filesRobert Jaffe (MIT)
15:00STAR Transverse Spin - Results and Plans ( 00:45 ) 0 filesSteven Heppelman (Pennsylvania State University)
15:45Coffee Break ( 00:30 ) 0 files (Pennsylvania State University)
16:15STAR Longitudinal Spin - Results and Plans ( 00:45 ) 0 filesErnst Sichtermann (LBL)

Spin Parallel Session