Dr
Walker Devin
(University of California - Berkeley)
27/07/2009, 14:00
Top Quark Physics
The LHC at design luminosity will generate 80 million top quark pairs which can be suitably tagged by the experimental collaborations. Because of the close connection between the electroweak symmetry breaking scale and their mass, these top quarks can be used as a probe of new physics at the LHC. In this talk, we review what new physics can be potentially discovered with top quark pairs...
Mr
Leandro Almeida
(Stony Brook University)
27/07/2009, 14:40
Top Quark Physics
Study of high-pt jets from QCD and from highly-boosted massive particles such as tops, W, Z and Higgs, and argue that infrared-safe observables can help reduce QCD backgrounds. Jets from QCD are characterized by different patterns of energy flow compared to the products of highly-boosted heavy particle decays, and we employ a variety of jet shapes, observables restricted to energy flow within...
Gavril Giurgiu
(Johns Hopkins)
27/07/2009, 14:55
Top Quark Physics
High mass resonance decaying into ttbar pairs appear in many extensions of the Standard Model. The top quarks from these decays have high transverse momentum and their decay products are typically bunched together due to the boost into the lab frame. As a result the standard techniques for reconstructing ttbar events begin to fail. In this talk we will discuss the prospects for detecting...
Sudhir Gupta
(Iowa State)
27/07/2009, 15:10
Top Quark Physics
We study the T odd correlations induced by CP violating anomalous top quark couplings at both production and decay level in the process gg --> t t_bar --> (b mu+ nu_mu) (b_bar mu- nu_mu_bar). We consider several counting asymmetries at the parton level and find the ones with the most sensitivity to each of these anomalous couplings at the LHC.
Mr
David Cox
(University of California, Davis)
27/07/2009, 15:25
Top Quark Physics
In the 15 years since the discovery of top at the Tevatron the data available has reached the point where we can perform in depth examinations of the top quark event sample for evidence of physics beyond the Standard Model. We present a search for a massive quark (t') decaying to Wq and thus mimicking the top quark decay signature. We use the reconstructed mass of the t' quark and the scalar...
Roberta Volpe
(INFN, Sezione di Perugia-Universita & INFN, Perugia-Unknown)
27/07/2009, 15:40
Dr
Julia (Jessie) Shelton
(Rutgers University)
27/07/2009, 16:30
Top Quark Physics
The top quark's uniquely large Yukawa coupling hints at a special connection between the top quark and the physics responsible for electroweak symmetry breaking. If new physics at the LHC is related to the electroweak hierarchy, it will typically lead to observable polarization signals for top quarks produced in association with new physics. Signals are observable for both events with and...
Dr
Alexei Varganov
(the University o Michigan)
27/07/2009, 16:45
Top Quark Physics
According to standard model top quarks decay weakly before any hadronization processes take effect.
This enables top quark spin information to be transmitted to the top quark decay products.
We discuss the measurement method for various decay channels and report first result for spin correlation in top pairs using dilepton events.
Mr
Glenn Strycker
(University of Michigan)
27/07/2009, 17:00
Top Quark Physics
We measure a forward-backward charge asymmetry in the rapidities of top quarks produced in $p\bar p$ collisions at $\sqrt s$=1.96 TeV. The $t\bar t$ kinematics are reconstructed in ~800 lepton+jets events collected in a 3 $fb^{-1}$ exposure with CDF detector at Fermilab. We present two independent techniques -- a model independent unfold and a likelihood fit to a linear asymmetry in the...
Dr
Monica Tecchio
(University of Michigan)
27/07/2009, 17:15
Top Quark Physics
CDF and D0 have recently reported measurements of the forward-backward asymmetry in top pair production in ppbar collisions at the Tevatron. We report here on a study of that asymmetry as a function of the invariant mass of the ttbar system. A simple unfold technique is used to propagate the laboratory measurement to the parton level simultaneously in the top quark rapidity and top-antitop...
Shabnam Jabeen
(Boston University-Unknown-Unknown)
27/07/2009, 17:30
Top Quark Physics
We present recent results related to the measurement of top quark production using ppbar collisions recorded with the D0 Detector at the Tevatron. The results are: Measurement of the Wtb coupling and of the W boson helicity (abstract 220), search for anomalous top quark couplings (228) and top spin correlations (not submitted as separate abstract)
Hyunsu Lee
(University of Chicago)
27/07/2009, 17:50
Top Quark Physics
More than a decade after its discovery we are still trying to find out more about the nature of the top quark. The current statistics of the Tevatron allow us to make stringent tests. In this talk we will present state of the art measurements of top quark properties. By studying rates and distributions sensitive to the production and decay mechanisms of top quarks, we can search for...
