Dr
Thomas Schoerner-Sadenius
(DESY)
14/09/2009, 13:00
Prof.
Fabio Maltoni
(University of Louvain)
14/09/2009, 13:15
I review the state-of-the-art of the theoretical predictions and the MC tools for single-top production (s-channel, t-channel and Wt) at the Tevatron and the LHC. Special attention will be devoted to the recent progress in the description of t-channel production of top and fourth generation quarks.
Dr
Dominic Hirschbuehl
(Bergische Universität Wuppertal)
14/09/2009, 14:25
At the LHC single top-quarks will be produced at a high rate corresponding to a third of the top-quark pair-production. In addition to the direct access to the CKM matrix element Vtb, single top-quark production is also sensitive to the existence of new heavy gauge bosons, forth generation quarks and various other new physics phenomena. Methods developed to optimize the selection of single...
Dr
Jeannine Wagner-Kuhr
(Karlsruher Institut für Technologie (KIT))
14/09/2009, 15:05
An overview of the activities of the CMS single top group is given with emphasis on the t-channel modeling and an early single top analysis. The selection and analysis strategies of such an analysis are summarized and the prospects are presented assuming an integrated luminosity of 200/pb at a centre-of-mass energy of 10TeV.
Dr
Patrick Motylinski
(Universität Freiburg)
14/09/2009, 17:15
When a top quark decays there is a large amount of angular correlation, in its rest frame, between its spin orientation and the direction of flight of the charged lepton from its decay. In this letter we investigate the prospects of measuring this angular correlation using the MC@NLO framework. The strength of the correlation is investigated for different spin bases. The robustness against...
Gia Khoriauli
(Universität Bonn)
14/09/2009, 17:45
We study electro-weak single-top quark production t-channel process at 10 TeV center-of-mass energy of the LHC. The analysis has been performed for anticipated 200 pb^-1 integrated luminosity using ATLAS Monte Carlo pseudo-data. We investigate cut based analysis optimization for t-channel into an electron final state. The main systematic uncertainty sources (jet energy scale, background...
Muhammad Alhroob
(Uni-Bonn)
14/09/2009, 18:10
At LHC single top quarks will be produced with more than 1 million events every year, a precise measurement of the cross section and comparing it with theoretical predictions will provide a crucial test of SM. For this reason the samples have to be purified from the background as much as possible and the remnant backgrounds such as W+jets and ttbar after cuts have to be measured. One of the...
Prof.
Heiko Lacker
(Humboldt Universität zu Berlin)
15/09/2009, 09:00
Current data do not exclude the existence of an additional sequential 4th generation of leptons and quarks. Such a natural extension of the standard model content has some interesting features: the possibility of gauge coupling unification without supersymmetry, a possible particular role of such particles in electroweak symmetry breaking and a sufficiently large amount of CP violation for...
Prof.
Tilman Plehn
(University of Edinburgh & MPI Muenchen)
15/09/2009, 10:05
Dr
Alexander Lenz
(Universität Regensburg)
15/09/2009, 10:35
We perform an exploratory study of the allowed parameter range for the CKM-like mixing of hypothetical quarks of a fourth generation. As experimental constraints we use the tree-level determinations of the 3X3 CKM elements and FCNC processes (K-, D-, B_d-, B_s-mixing and the decay b->s gamma) under the assumption that the 4X4 CKM-matrix is unitary. For the FCNCs we use some simplifying...
Marta Felcini
(University College Dublin)
15/09/2009, 11:20
The ATLAS and CMS trigger systems have been designed to cope with unprecedented luminosities and accelerator bunch-crossing conditions. Trigger selections have been designed to have high efficiency for SM processes. Top-quark production is one of those for which the trigger efficiency is expected to be very high. This should ensure high efficiency for single top and fourth-generation quarks....
Clemens Lange
(DESY Zeuthen)
15/09/2009, 11:45
The identification of jets originating from a b quark is called b-tagging. It takes advantage of several of the b quark's properties such as the relatively long lifetime of the b-hadron and the therefore existing secondary vertex in the jet. The use of b-tagging is an essential ingredient for the selection of single top events. These contain a b quark from the top quark decay, which makes it...
Julien Donini
(Universite Joseph Fourier Grenoble)
15/09/2009, 12:10
The search for Single Top process at LHC using first data will involve several steps, from the identification and reconstruction of objects that characterize Single Top signature (lepton, missing transverse energy, b-jet) to the reduction and modeling of the main backgrounds (multijet, W+jets, ttbar) and the selection of a purified signal sample using advanced statistical techniques. The...
Martin zur Nedden
(Humboldt-Universitaet zu Berlin)
15/09/2009, 12:50
