Conveners
P12 – COLLIDER PHENOMENOLOGY
- Juan Antonio Aguilar Saavedra (LIP)
Ezequiel Alvarez
(Universidad Nacional de San Luis, INFAP, Conicet, Argentina)
01/06/2011, 16:30
We show that Tevatron recent results on the $t \bar t$ forward-backward asymmetry for large invariant mass might be suggesting a possible contribution of a light ($\sim 700$ GeV) and narrow resonance in the $s$ channel. The resonant contribution of this particle to the $p \bar p \to t \bar t$ process would generate a high invariant-mass forward-backward asymmetry and, being narrow, the...
Dr
Jernej Kamenik
(Jozef Stefan Institute)
01/06/2011, 16:45
We analyse a simple Standard Model (SM) extension with only two new light fields: a scalar partner of the top (stop) (with mass above m_t) and a light neutral fermion chi^0 (with mass of a few GeV), coupled to SM quarks via a Yukawa interaction. We show that such model can lead to a significant enhancement of the forward-backward asymmetry in t tbar production at the Tevatron via the...
Dr
Manuel Perez-Victoria
(University of Granada)
01/06/2011, 17:00
I discuss the impact of new physics on opposite-sign and same-sign top pair production, with emphasis on the forward-backward asymmetry.
Nuno Castro
(LIP)
01/06/2011, 17:15
The recent measurements of top decay observables from ATLAS and the t-channel single top production cross section from CMS are used to set combined limits on the Wtb vertex structure. These limits are compared with the corresponding ones from Tevatron.
Mr
florian Bonnet
(INFN Sezione di Padova)
01/06/2011, 17:30
We discuss the impact of non-standard Higgs couplings at the LHC. Using a model-independent -effective Lagrangian- approach, we focus on pure Higgs and Higgs-gauge operators, assuming that the new physics scale is larger than the electroweak one. Present constraints and future signals are explored, for those anomalous couplings which may be generated by tree-level exchange of unknown heavy...
Dr
Elisabetta Furlan
(Brookhaven National Lab)
01/06/2011, 17:45
The search for the Higgs boson is a primary objective at the Tevatron and the LHC. The dominant production mechanism is gluon fusion, for which new physics effects can lead to significant deviations from the Standard Model predictions.
We consider extensions of the Standard Model with heavy particles in various representations of the Lorentz group and with arbitrary couplings to the Higgs...
Dr
Jorge de Blas Mateo
(University of Notre Dame)
01/06/2011, 18:00
We study the possibility of relaxing the indirect limits on extra neutral vector bosons by their interplay with additional new particles. They can be systematically weakened, even below present direct bounds at colliders, by the addition of more vector bosons and/or scalars designed for this purpose. Otherwise, they appear to be robust.
Ennio Salvioni
(CERN/University of Padua)
01/06/2011, 18:15
We discuss, within an effective approach, the phenomenology of a charged W' vector transforming as an iso-singlet under the Standard Model gauge group. Firstly, we present bounds from current data, finding that these are quite weak for suitable choices of the right-handed quark mixing matrix. Then, the resonant production at the early LHC of such a weakly constrained W' is discussed. We start...
Dr
Leonardo Vernazza
(Johannes Gutenberg Universität)
01/06/2011, 18:45
We use a recent approach to threshold soft gluon resummation, based on effective field theory, to quantify the dynamical enhancement of the partonic threshold region for Drell-Yan and slepton pair production in supersymmetry. We evaluate the resummed invariant mass distribution and cross section at the NNLL order, and match the result onto NLO fixed-order calculation.
