Prof.
Lance Dixon
(SLAC National Accelerator Laboratory (US))
05/07/2012, 09:00
Track 12. Formal Theory Developments
Parallel Sessions
Scattering amplitudes in N=4 Super-Yang-Mills theory are tightly constrained by several general principles: Dual (super)conformal invariance, an operator product expansion for the leading singularity, discrete symmetries, the properties of transcendental functions, and various kinematic limits. Remarkably, these onstraints can be combined to almost completely determine the six-gluon...
Dr
David Kosower
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 09:20
Track 12. Formal Theory Developments
Parallel Sessions
The unitarity method is a key part of the set of on-shell methods for calculating gauge-theory amplitudes both analytically and numerically. These methods have been used successfully to obtain the one-loop amplitudes needed for a variety of cutting-edge high-multiplicity next-to-leading order calculations for LHC physics. They have been applied both to analytic ...
Prof.
L.C. Rohana Wijewardhana
(University of Cincinnati (US))
05/07/2012, 09:40
Track 12. Formal Theory Developments
Parallel Sessions
We study the spectrum of vector and scalar mesons in the holographic dual of a walking gauge theory , obtained by embedding D7 - anti-D7 probe branes in a certain type IIB background. We show that there is a nontrivial relation that needs to be satisfied in order for axial-vector modes to exist The scalar mesons arise from fluctuations of the probe flavour branes and complement the...
Dr
Doyoun Kim
(Monash University (AU))
05/07/2012, 10:00
Track 12. Formal Theory Developments
Parallel Sessions
We have performed a holographic calculation of the hadronic contributions to the anomalous magnetic moment of the muon, using the gauge/gravity duality. We compute the leading order hadronic (HLO) contribution to the anomalous magnetic moment of muon, amu(HLO), and find amu(HLO) =470.5 x 10^{-10} in AdS/QCD with two light flavors, which is compared with the currently revised BABAR data...
Dr
Anthony Hartin
(DESY (DE))
05/07/2012, 10:15
Track 12. Formal Theory Developments
Parallel Sessions
Future linear colliders will be precision machines which, among other things, will closely study the Higgs sector, provide tighter bounds on electroweak observables and look for new physics via polarised beams. The luminosity requirements of such machines entail very intense lepton bunches at the IP with associated strong electromagnetic fields. These strong fields not only lead to obvious...
Prof.
Bennie Ward
(Baylor University (US))
05/07/2012, 11:00
Track 12. Formal Theory Developments
Parallel Sessions
We present a formulation of the operator product expansion that is infrared finite to all orders in the attendant massless non-Abelian gauge theory coupling constant, which we will often-times associate with the QCD theory, the theory that we actually have as our primary objective in view of the operation of the LHC at CERN. We make contact in this way with the recently introduced IR-improved...
Dr
Daniel Fernandez-Fraile
(Frankfurt University (DE))
05/07/2012, 11:15
Track 12. Formal Theory Developments
Parallel Sessions
We present our latest results concerning the radiation spectrum emitted by a relativistic charged particle at strong coupling, employing the theoretical techniques provided by the AdS/CFT correspondence. We compare with other recent analyses of this problem with heavy quarks [1,2], and in our case we do find deviations from the (classical) Lienard formula once we take into account all the...
Prof.
Luc Marleau
(Université Laval (CA))
05/07/2012, 11:30
Track 12. Formal Theory Developments
Parallel Sessions
We propose to describe nuclei as near BPS solitons emerging from a generalization of the Skyrme model in the regime where a sixth-order term and a generalized mass term dominate. The mass term is chosen such that the baryon and energy density generated by the solutions do not exhibit the usual shell configuration. Adding contributions from the rotational energy, Coulomb energy and isospin...
Dr
Donatello Dolce
(University of Melbourne (AU))
05/07/2012, 11:45
Track 12. Formal Theory Developments
Parallel Sessions
In the Lorentz invariant formalism of compact space-time dimensions the assumption of periodic boundary conditions represents a consistent semi-classical quantization condition for relativistic fields. In [arXiv:1110.0315, Ann. Phys. (2012)] we have shown, for instance, that the ordinary Feynman path integral is obtained as interference between the classical paths with different winding...
Prof.
Gopinath Kamath
(Indian Institute of Technology-Madras (IN))
05/07/2012, 12:00
Track 12. Formal Theory Developments
Parallel Sessions
The Antonsen – Bormann idea was originally proposed by these authors for the computation of the heat kernel in curved space; it was also used by the author recently with the same objective but for the Lagrangian density for a real massive scalar field in 2 + 1 dimensional stationary curved space,the metric being defined by the rotating solution of Deser et al. Ann.Phys.120,220(1984) and...
Dr
Svetlana Barkanova
(Acadia University (CA))
05/07/2012, 12:15
Track 12. Formal Theory Developments
Poster Sessions
High-precision electroweak experiments such as parity-violating Møller scattering can provide indirect access to physics at multi-TeV scales and play an important complementary role to the LHC research program. However, before physics of interest can be extracted from experimental data, electroweak radiative corrections, which can significantly reduce the cross-section asymmetry, must be...
Prof.
Yuri Shirman
(University of California-Irvine (US))
05/07/2012, 14:00
Track 12. Formal Theory Developments
I will describe models where dynamical supersymmetry breaking is triggered by monopole condensation. Low energy theory is described by O'Rafeartaigh models with spontaneously broken R-symmetry.
Dr
Dario Francia
(Centro E. Fermi and Scuola Normale Superiore (IT))
05/07/2012, 14:20
Track 12. Formal Theory Developments
Parallel Sessions
The formulation of consistent theories involving particles with arbitrary spin represents an old open theoretical challenge. In the massless case the corresponding gauge theories provide far-reaching generalisations of Yang-Mills theory and General Relativity, while massive higher-spin states are known to represent essential ingredients of the spectrum of String Theory. I will describe the...
Prof.
Bennie Ward
(Baylor University (US))
05/07/2012, 14:40
Track 12. Formal Theory Developments
Parallel Sessions
We use the amplitude-based resummation of Feynman`s formulation of Einstein`s theory to arrive at a UV finite approach to quantum gravity. We show that we recover the UV fixed point recently claimed by the exact field-space renormalization group approach. We use our approach in the context of the attendant Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the...
Prof.
Rosy Teh
(Universiti Sains Malaysia (MY))
05/07/2012, 14:55
Track 12. Formal Theory Developments
Parallel Sessions
We would like to show the existence of finite energy SU(2) Yang-Mills-Higgs particles of one-half topological charge. The 't Hooft Abelian magnetic fields of these solutions at spatial infinity correspond to the magnetic field of a positive one-half magnetic monopole located at the origin, $r=0$, and a semi-infinite Dirac string singularity located on one half of the $z$-axis which carries a...
Dr
Aleksandrs Aleksejevs
(Memorial University of Newfoundland (CA))
05/07/2012, 15:10
Track 12. Formal Theory Developments
Parallel Sessions
Compton scattering offers a unique opportunity to study the dynamical structure of hadrons over a wide kinematic range, with polarizabilities characterizing the hadron’s active internal degrees of freedom.
We present calculations and detailed analysis of electric and magnetic and the spin-dependent dynamical polarizabilities for the lowest in mass SU(3) octet of baryons.
These...
Prof.
Nikolaos Kidonakis
(Kennesaw State University (US))
05/07/2012, 16:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
I present new results for W-boson production at large transverse momentum at the LHC and the Tevatron. The contribution of soft-gluon corrections is derived from NNLL resummation and added to the exact NLO result.
Numerical results for the approximate NNLO W-boson transverse momentum distributions are derived. The scale and PDF uncertainties are discussed.
Prof.
Ashutosh Kotwal
(Duke University (US))
05/07/2012, 16:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
The mass of the W boson is sensitive to radiative corrections from the top quark and the Higgs boson. We present a new measurement of mW using 2.2/fb of sqrt(s)=1.96 TeV ppbar collision data collected with the CDF II detector. Utilizing 470126 W → eν candidates and 624708 W → μν candidates, we measure mW = 80387±19 MeV. This is the most precise measurement of mW, more precise than all previous...
Dr
Jan Stark
(Laboratoire de Physique Subatomique et de Cosmologie)
05/07/2012, 16:30
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
We present a measurement of the W boson mass using data corresponding to an integrated luminosity of 4.3 fb-1 collected with the D0 detector during Run 2 at the Fermilab Tevatron ppbar collider. With a sample of 1,677,394 W---> e nu candidate events, we measure M_W = 80.367 +/- 0.026 GeV. This result is combined with an earlier D0 result determined using an independent Run 2 data sample,...
Dr
Sarah Marie Demers
(Yale University (US))
05/07/2012, 16:45
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
A measurement of tau polarization in W-> tau nu decays is reported with data collected by the ATLAS experiment.
It is measured from the energies of the decay products in hadronic tau decays with a single final state charged particle,
and it is found in agreement with the Standard Model prediction.
Mr
Masaki Ishitsuka
(Tokyo Institute of Technology)
05/07/2012, 17:00
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
A study of events containing two tau leptons with high transverse momentum has been performed with the ZEUS detector at HERA, using a data sample corresponding to an integrated luminosity of 0.33 fb-1. The tau candidates were identified from their decays into electrons, muons or hadronic jets. The number of tau-pair candidates has been compared with the prediction from the Standard Model,...
Dr
Katarzyna Wichmann
(DESY)
05/07/2012, 17:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
A search for events ep-> ep Z0 has been performed in ep collisions at HERA using the ZEUS detector. The search is based on the entire HERA-I and HERA-II data set, amounting to 0.49 fb-1 of integrated luminosity. The Z0 was searched in the di-jet decay mode with elastic condition defined by etamax < 3, where etamax is defined as the pseudorapidity of the energy deposit in the calorimeter...
Maciej Rybczynski
(Jan Kochanowski University (PL))
05/07/2012, 17:30
Track 9. Heavy Ion Collisions
Parallel Sessions
The exploration of the QCD phase diagram particularly the search for a phase transition from hadronic to partonic degrees of freedom and possibly a critical endpoint, is one of the most challenging tasks in present heavy-ion physics. As observed by the NA49 experiment, several hadronic observables in central Pb+Pb collisions at the CERN SPS show qualitative changes in their energy dependence....
