Dies: 20 i 21 de desembre
de 2006
Lloc:Facultat de Fisica de la Universitat de Barcelona 
Sponsors:
Grup de Fisica Teorica UB
Facultat de Fisica UB
Registre: Si us plau, si teniu intencio d'acudir a les xerrades, registreuvos enviant un correu a Jaume Guasch: . El registre és de franc. Podeu consultar el llistat de participants registrats aquí.
Registration: Please, if you want to attend the talks register to the meeting by sending an email to Jaume Guasch: . Registration is free. You can look up to the registered participants list here.
Programa
Dimecres, 20 de desembre
Chairman: J. Russo (UB) 
10:0011:00 
Concha Gonzalez (UB)

ABSTRACT 
11:0011:45 
Xavier Garcia Tormo (Argonne, US) 
ABSTRACT TALK (pdf) 
11:4512:15 
COFFEE BREAK 

12:1513:00 
David Mateos (Santa Barbara, US)

ABSTRACT TALK (pdf) 
13:0015:00 
DINAR 

Chairman: J. Gomis (UB) 
15:0015:45 
Ignazio Scimemi (MIT, US) 
ABSTRACT 
15:4516:15 
COFFEE BREAK 

16:1517:00 
Roman Orus (Queensland, Australia) 
ABSTRACT TALK (ppt) 
Dijous, 21 de Desembre
Chairman: E. Verdaguer (UB) 
10:0010:45 
Ernest Aguiló (U. of Alberta & York U., Canada) 
ABSTRACT TALK (pdf) 
10:4511:30 
Juan RojoChacon (LPTHE, Paris) 
ABSTRACT TALK (pdf) 
11:3012:00 
COFFEE BREAK 

12:0012:45 
Albert Roura (LANL, US) 
ABSTRACT TALK (pdf) 
13:0015:00 
DINAR 

Chairman: J. Sola (UB) 
15:0015:45 
Francesc Ferrer (Case Western, US)

ABSTRACT TALK (pdf) 
15:4516:15 
COFFEE BREAK 

16:1517:15 
Michael Spira (PSI, Switzerland) 
ABSTRACT TALK (pdf) 
Títols i Abstracts
 Concha Gonzalez (UB)
"Phenomenology with massive neutrinos"
 Xavier Garcia Tormo (Argonne, US)
"Extracting alpha_s from radiative heavy quarkonium decays"
We extract the strong coupling constant alpha_s from the inclusive radiative decays of heavy quarkonium. Taking advantage of recent progress on the understanding of the photon spectrum, we obtain a value for alpha_s which is in good agreement with the current world average (in contrast with previous extractions).
 David Mateos (UC Santa Barbara, USA)
"String Theory and RHIC Physics: The Fundamental Story"
I will describe recent progress in using string theory to learn about the properties of quarkgluon plasma created in experiments at the Relativistic Heavy Ion Collider (RHIC) in Brookhaven.
 Ignazio Scimemi (MIT, US)
"PionPion Scattering length and CPV in K>3 Pi"
I will review the recent progresses in the extraction of the pionpion scattering length from the spectrum of K>3 Pions. I will discuss the recent estimations and errors. I will review also the possibility of measuring the violation of CP in K>3 pions.
 Roman Orus (Queensland, Australia)
"Tensor networks and the numerical study of quantum and classical
systems on infinite lattices"
In this talk I shall present some recent developements on the problem of applying tensor network techniques to compute the properties of quantum systems on infinite lattices (or in the thermodynamic limit). First, I will show that it is possible to perform accurate simulations of the time evolution of a manybody density matrix as driven by a 1dimensional master equation, by means of using disentangling isometries applied to a purification subspace. This scheme provides a much faster way of computing the time evolution of reduced density operators as compared to a previous method proposed by Zwolak and Vidal, and provides an alternative to compute thermal states introducing much less unrealistic quantum correlations as compared to a previous proposal of Verstraete, GarciaRipoll and Cirac. Second, I will explain that it is possible to perform the contraction of an infinite 2dimesional tensor network (also called PEPS), and show that it can be applied to numerically compute the correlator of the classical 2dimensional Ising model at criticality up to 100 sites with modest computational resources. The previous calculation opens the path to the imminent application of PEPS to compute the groundstate properties and the dynamics of quantum manybody systems on infinite 2dimensional lattices.
 Ernest Aguilo (University of Alberta & York University, Canada)
"Electroweak production of single top quarks at the Tevatron"
The results of a search for electroweak production of single top quarks in {\ppbar} collisions at $\sqrt{s} = 1.96$~TeV at the Fermilab Tevatron collider are presented. From a dataset with integrated luminosity of nearly 1~fb$^{1}$, events that include an isolated electron or muon, missing transverse energy, and two, three or four jets are selected. One or two of the jets are identified as originating from the decay of a $b$~hadron. Several multivariate analyses to separate the expected signal from background ar used, and cross sections of $1.0 \pm 0.9$~pb for the schannel $tb$ process, $4.2^{+1.8}_{1.4}$~pb for the tchannel process $tqb$, and $4.9 \pm 1.4$~pb for the combined process $tb$+$tqb$ are measured. This is the first evidence for electroweak production of single top quarks.
 Juan RojoChacon (LPTHE, Paris, France)
"Jet Physics at the LHC"
A quantitative control over high energy jets is essential at the highmultiplicity LHC collisions, specially to unambigously indentify many new physics channels.
In this talk we present an introduction to the subject of jet physics at hadron colliders and briefly review some new theoretical and experimental advances in this field.
 Albert Roura (LANL, US)
"Probing metric fluctuations near blackhole horizons"
The effect on Hawking radiation of quantum metric fluctuations near the horizon with characteristic lengthscales much larger than the Planck length is analyzed within a lowenergy effective field theory approach to quantum gravity. After discussing the properties of quantum stresstensor fluctuations near the horizon, I will describe how one can infer the effect on Hawking radiation within the geometric optics approximation by studying geodesics in a fluctuating metric. Finally, I will explain the shortcomings of the geometricoptics approximation in that context and the need for a full QFT treatment, and how this can be achieved at least in the nearhorizon region. (LAUR 064119)
 Francesc Ferrer (Case Western, USA)
"Indirect detection of light neutralino dark matter"
The prospects for indirect detection of neutralino dark matter in supersymmetric models with an extended Higgs sector (NMSSM) will be explored. Expected signals in neutrino telescopes due to the annihilation of relic neutralinos in the Sun and in the Earth will be reviewed, as well as the prospects of detection of a neutralino annihilation signal in spacebased gammaray, antiproton and positron search experiments, and at lowenergy antideuteron searches. A potentially light CPodd Higgs boson exchange, can strongly enhance the radiative modes for neutralino pair annihilation into two photons, making the possibility of the detection of a monochromatic gammaray line within the NMSSM more promising than in the MSSM.
 Michael Spira (PSI, Switzerland)
"Search for Higgs Bosons at future Colliders"
The prospects for the Higgsboson search at future colliders, such as the LHC and a linear e+ e collider in the energy range up to 1 TeV, and the determinantion of its/their properties will be reviewed. We focus on the Standard Model Higgs boson and the Higgs particles of the minimal supersymmetric extension.