|
version 1.1.1.1, 2011/05/18 21:30:39
|
version 1.2, 2011/06/01 01:20:54
|
|
Line 1
|
Line 1
|
| This note presents a new measurement of $p\bar p \to t \bar tX$ production |
We present a new measurement of $p\bar p \to t \bar tX$ production |
| at $\sqrt{s}=1.96$ TeV using 4951.86 pb$^{-1}$ of data collected with the |
at $\sqrt{s}=1.96$ TeV using 4951.86 pb$^{-1}$ of data collected with the |
| D\O\ detector between 2002 and 2010. We focus on the final state |
D0 detector between 2002 and 2010. We focus on the final state |
| where the $W$ boson from one of the top quarks decays into a |
where the $W$ boson from one of the top quarks decays into a |
| $\tau$ lepton and its associated neutrino, while the other W boson decays into |
$\tau$ lepton and its associated neutrino, while the other $W$ boson decays into |
| a quark-antiquark pair. We aim to select those events in which the |
a quark-antiquark pair. We aim to select those events in which the |
| $\tau$ lepton subsequently decays hadronically, meaning to one or three charged hadrons, zero |
$\tau$ lepton subsequently decays hadronically, meaning to one or more charged hadrons, zero |
| or more neutral hadrons and a tau neutrino. We use a neural network b-tagging algorithm |
or more neutral hadrons and a tau neutrino. We train a topological neural network |
| as well as a topological neural network to enhance signal over the background. For a top quark |
as the method to enhance signal over the background. For a top quark |
| mass of 172.5 GeV the preliminary result for the measured cross section is: |
mass of 172.5 GeV we measure the cross section to be: |
| |
|
| \begin{center}\[\sigma (t\overline{t}) = |
\begin{center}\[\sigma (t\overline{t}) = |
| 8.46\;\;_{-1.04}^{+1.06}\;\;({\textrm{stat}})\;\;_{-0.88}^{+0.92}\;\;({\textrm{syst}})\;\;\pm 0.3\;\;({\textrm{lumi}})\;\; \rm{pb.}\] |
8.46\;\;_{-1.04}^{+1.06}\;\;({\textrm{stat}})\;\;_{-0.78}^{+0.84}\;\;({\textrm{syst}})\;\;\pm 0.3\;\;({\textrm{lumi}})\;\; \rm{pb.}\] |
| \par\end{center} |
\par\end{center} |
| |
|
![[BACK]](/icons/small/back.gif){kind=icon}
Return to Abstract.tex CVS log ![[TXT]](/icons/small/text.gif){kind=icon}
![[DIR]](/icons/small/dir.gif){kind=icon}
Up to [Nicadd] / ttbar / p20_taujets_note