Liming CHEN, Bo LI, Emmanuel MONNIER, Lian-You SHAN, Chengguang ZHU FCPPL5, Mar 21, Orsay ( Many thanks to the organizers )

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Presentation transcript:

Liming CHEN, Bo LI, Emmanuel MONNIER, Lian-You SHAN, Chengguang ZHU FCPPL5, Mar 21, Orsay ( Many thanks to the organizers )

+ Introduction + W polarization measurement – Semi-lepton channel – Di-lepton channel + Top spin correlation measurement + Summary Saclay, Mar 23, 2012L.Y. W&top polarization2

+ “top property group” in ATLAS – CPPM, SDU, IHEP in competing with  Gottingen, LIP, /fb 2011 data analyzed – Note prepared + 4.7/fb analysis in progress – spin correlation in preparation Saclay, Mar 23, 2012L.Y. W&top polarization3

Saclay, Mar 23, 2012L.Y. W&top polarization4

EF_e20_medium/EF_mu18 EF_e22vh_medium1 EF_mu18_medium The angle between lepton direction in W ( top ) rest frame and W ( top ) direction in top ( ttbar ) rest frame Saclay, Mar 23, 2012L.Y. W&top polarization5 t w

Saclay, Mar 23, 2012L.Y. W&top polarization6

Saclay, Mar 23, 2012L.Y. W&top polarization7 elemuo + W+jet : 2-b tag MC-effi multiplied to DD scale + Mjets : DD-extracted faking multiplied to loose-control + Others : MC simulation

Saclay, Mar 23, 2012L.Y. W&top polarization8

uncertF0 emFL emF0 muFL muF0 combFL comb ISR/FSR JER Btag JES LHC ? LRE Saclay, Mar 23, 2012L.Y. W&top polarization9 SM Dominant uncertainty In addition to ATLAS-Conf notes, The Editor Board has approved the paper draft on 1/fb result

Saclay, Mar 23, 2012L.Y. W&top polarization10

Saclay, Mar 23, 2012L.Y. W&top polarization11

Saclay, Mar 23, 2012L.Y. W&top polarization12 Systematics in progress, many thanks to Liming CHEN 380/3139/1045 events in ee/em/mm channel

Saclay, Mar 23, 2012L.Y. W&top polarization13

+ C = 0.42 ( SM 0.32 ) + Systematics ongoing, many thanks to Bo LI Saclay, Mar 23, 2012L.Y. W&top polarization14 About 3500 ele eventsAbout 500 Muo events

+ Good progress + Work more for better precision – Thanks ! Saclay, Mar 23, 2012L.Y. W&top polarization15