Difference: Bbasym (1 vs. 4)

Revision 42014-03-10 - KatharinaMueller

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META TOPICPARENT name="LHCbQEEPublicResults"

Measurement of the forward-central bbˉ production asymmetry

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The conference note is available here
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The conference note is available here (LHCb-CONF-2013-001)
  More detailed information: ANA note 2013-007

Abstract

Revision 32014-01-17 - KatharinaMueller

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META TOPICPARENT name="LHCbQEEPublicResults"

Measurement of the forward-central bbˉ production asymmetry

The conference note is available here

Added:
>
>
More detailed information: ANA note 2013-007
 

Abstract

A measurement of the forward-central bbˉ production asymmetry is reported based on data collected by {\mbox{LHCb}\xspace} in 2011 at √s=7TeV corresponding to an integrated luminosity of 1.0~fb−1. Events are selected that have two identified b jets, one of which is flavor tagged by the presence of a displaced muon with high momentum. The following results are obtained:

Revision 22013-04-26 - KonstantinosPetridis

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META TOPICPARENT name="LHCbQEEPublicResults"

Measurement of the forward-central bbˉ production asymmetry

The conference note is available here

Abstract

Changed:
<
<
A measurement of the forward-central bbˉ production asymmetry is reported based on data collected by {\mbox{LHCb}\xspace} in 2011 at s√=7~TeV corresponding to an integrated luminosity of 1.0~fb−1. Events are selected that have two identified b jets, one of which is flavor tagged by the presence of a displaced muon with high momentum. The following results are obtained:
>
>
A measurement of the forward-central bbˉ production asymmetry is reported based on data collected by {\mbox{LHCb}\xspace} in 2011 at √s=7TeV corresponding to an integrated luminosity of 1.0~fb−1. Events are selected that have two identified b jets, one of which is flavor tagged by the presence of a displaced muon with high momentum. The following results are obtained:
 
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AbbˉFC==(0.50.5(stat)0.5(syst))%,
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AbbˉFC=(0.50.5(stat)0.5(syst))%,
 
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AbbˉFC(Mbbˉ>100 GeV)==(4.31.7(stat)2.4(syst) )%.
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AbbˉFC(Mbbˉ>100 GeV)=(4.31.7(stat)2.4(syst) )%.
  The asymmetry in the high-mass region is not corrected for the bbˉ mass resolution. Studies of simulated data estimate the dilution due to the di-jet mass resolution to be a few percent.
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Caption Figure
Di-jet b bbar mass distributions for (solid black) all events, (dashed red) flavor-tagged events and (dotted blue) doubly- flavor-tagged events. Fig1.png
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Distributed B candidate masses for B+!J= K+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential Fig2a.png
Distributed B candidate masses for B+!D0+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential, while the PDF of the partially-reconstructed background in B+!D0+ is obtained from simulation Fig2b.png
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Distributed B candidate masses for B->J/psi K+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential Fig2a.png
Distributed B candidate masses for B+->D0pi+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential, while the PDF of the partially-reconstructed background in B+->D0pi+ is obtained from simulation Fig2b.png
 
Observed (black solid) pseudo-lifetime distribution of flavor-tagged b jets. The signal shape (red dashed) is taken from simulation, while the background shape (blue dotted) is assumed to be uniform. The background is estimated to be O(0.2%) Fig3.png
Observed time dependence of the tagging purity (black points). The (solid blue) curve is the predicted distribution obtained from simulation and has no free parameters Fig4.png
Observed y distributions for all events. The dashed distribution (mirror data) corresponds to delta y -> - delta y Fig5a.png

Revision 12013-04-05 - TaraShears

Line: 1 to 1
Added:
>
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META TOPICPARENT name="LHCbQEEPublicResults"

Measurement of the forward-central bbˉ production asymmetry

The conference note is available here

Abstract

A measurement of the forward-central bbˉ production asymmetry is reported based on data collected by {\mbox{LHCb}\xspace} in 2011 at s√=7~TeV corresponding to an integrated luminosity of 1.0~fb−1. Events are selected that have two identified b jets, one of which is flavor tagged by the presence of a displaced muon with high momentum. The following results are obtained:

AbbˉFC==(0.50.5(stat)0.5(syst))%,

AbbˉFC(Mbbˉ>100 GeV)==(4.31.7(stat)2.4(syst) )%.

The asymmetry in the high-mass region is not corrected for the bbˉ mass resolution. Studies of simulated data estimate the dilution due to the di-jet mass resolution to be a few percent.

Figures

(Note, eps versions are available under attachments).

Caption Figure
Di-jet b bbar mass distributions for (solid black) all events, (dashed red) flavor-tagged events and (dotted blue) doubly- flavor-tagged events. Fig1.png
Distributed B candidate masses for B+!J= K+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential Fig2a.png
Distributed B candidate masses for B+!D0+ decays used in the flavor-tagging study. Asymmetric Gaussian distributions are used for the signal PDFs; the combinatorial backgrounds are taken to be exponential, while the PDF of the partially-reconstructed background in B+!D0+ is obtained from simulation Fig2b.png
Observed (black solid) pseudo-lifetime distribution of flavor-tagged b jets. The signal shape (red dashed) is taken from simulation, while the background shape (blue dotted) is assumed to be uniform. The background is estimated to be O(0.2%) Fig3.png
Observed time dependence of the tagging purity (black points). The (solid blue) curve is the predicted distribution obtained from simulation and has no free parameters Fig4.png
Observed y distributions for all events. The dashed distribution (mirror data) corresponds to delta y -> - delta y Fig5a.png
Observed y distributions for events with measured Mbb > 100 GeV. The dashed distribution (mirror data) corresponds to delta y -> - delta y Fig5b.png

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