# TOP-12-016 Measurement of Top Polarization in Top-antitop Pair Events in the Dilepton Channels in pp Collisions at sqrt(s)=7 TeV

## Abstract

A measurement of the top quark polarization in events is performed in a data sample corresponding to a total integrated luminosity of collected by the CMS experiment in pp collisions at a centre-of-mass energy of 7 TeV at the LHC. The measured value in the helicity basis is , in agreement with the standard model expectation.

## Tables

Tables Caption
Table1: The observed and simulated yields after the event selection described in the text. Uncertainties are statistical only. Where the simulated yields are zero, upper limits are given based on the weighted yield, had one of the simulated events passed the selection.

 Table2: Binning used in the distributions of .

 Table3: Systematic uncertainties.

## Figures

 Comparison of data and simulation for number of b tagged jets and number of vertices.

 The reconstruction level distributions, for data and the simulation. The simulated events are divided into and background, where the background consists of the categories other than in Table 1.

 Acceptance matrix bins (left) and smearing effects due to the uncertainties of top reconstruction (right).

 Background-subtracted and unfolded distribution. The error bars represent statistical uncertainties only, while the systematic uncertainty band is represented by the hatched area. Note that the bin values are correlated due to the unfolding.

-- YanjunTu - 01-Jul-2012

Topic attachments
I Attachment History Action Size Date Who Comment
pdf Response_lep_costheta_cms.pdf r1 manage 14.4 K 2012-07-01 - 03:40 YanjunTu
png Response_lep_costheta_cms.png r1 manage 58.7 K 2012-07-01 - 03:40 YanjunTu
pdf Table1.pdf r1 manage 59.0 K 2012-07-01 - 04:13 YanjunTu
png Table1.png r1 manage 64.9 K 2012-07-01 - 04:13 YanjunTu
pdf Table2.pdf r1 manage 13.7 K 2012-07-01 - 04:13 YanjunTu
png Table2.png r1 manage 13.1 K 2012-07-01 - 04:13 YanjunTu
pdf Table3.pdf r1 manage 25.5 K 2012-07-01 - 04:13 YanjunTu
png Table3.png r1 manage 25.7 K 2012-07-01 - 04:13 YanjunTu
pdf accept_lepPlusCosTheta.pdf r1 manage 14.1 K 2012-07-01 - 03:40 YanjunTu
png accept_lepPlusCosTheta.png r1 manage 66.9 K 2012-07-01 - 03:40 YanjunTu
pdf finalplot_lepMinus_costheta_cms.pdf r1 manage 15.6 K 2012-07-01 - 03:40 YanjunTu
png finalplot_lepMinus_costheta_cms.png r1 manage 212.4 K 2012-07-01 - 03:40 YanjunTu
pdf finalplot_lep_costheta_cms.pdf r1 manage 15.6 K 2012-07-01 - 03:40 YanjunTu
png finalplot_lep_costheta_cms.png r1 manage 212.0 K 2012-07-01 - 03:40 YanjunTu
pdf finalplot_unfolded_lep_costheta_cms_withsyst.pdf r1 manage 15.7 K 2012-07-01 - 03:40 YanjunTu
png finalplot_unfolded_lep_costheta_cms_withsyst.png r1 manage 105.3 K 2012-07-01 - 03:40 YanjunTu
pdf preselection_nVtx.pdf r1 manage 16.5 K 2012-07-01 - 03:16 YanjunTu
png preselection_nVtx.png r1 manage 93.2 K 2012-07-01 - 03:12 YanjunTu
pdf preselection_nbtag.pdf r1 manage 15.0 K 2012-07-01 - 03:25 YanjunTu
png preselection_nbtag.png r1 manage 86.0 K 2012-07-01 - 03:25 YanjunTu
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Topic revision: r2 - 2012-07-02 - RobertoTenchini

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