A5051254812- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Noncommutative and Quantum Gravity Theories
- Complex Systems and Time Series Analysis
- Nuclear Physics and Applications
- advanced mathematical theories
- Advanced NMR Techniques and Applications
- Advanced MRI Techniques and Applications
- Nuclear reactor physics and engineering
Universidade de São Paulo
2009-2023
Fermi National Accelerator Laboratory
1995-2010
Lawrence Berkeley National Laboratory
2002-2005
University of California, Berkeley
2004
Boston University
2000-2001
University of Wisconsin–Madison
1997-2000
Technical University of Munich
1996
University of Massachusetts Amherst
1990-1995
Stanford Synchrotron Radiation Lightsource
1995
SLAC National Accelerator Laboratory
1995
We perform a comprehensive study of number rare charm decays, incorporating the first evaluation QCD corrections to short distance contributions, as well examining long range effects. For processes mediated by $\stackrel{\ensuremath{\rightarrow}}{c}{\mathrm{ul}}^{+}{l}^{\ensuremath{-}}$ transitions, we show that sensitivity physics exists in kinematic regions away from vector meson resonances dominate total rate. In particular, find...
Theories of physics beyond the standard model that address hierarchy problem generally involve top partners, new particles cancel quadratic divergences associated with Yukawa coupling Higgs boson to quark. With extensions colored coming under strain from collider searches, scenarios in which partners carry no charge strong interactions have become increasingly compelling. Although elusive for direct these theories predict modified couplings particles. This results corrections production and...
In strong dynamical schemes for electroweak symmetry breaking the third generation must be treated in a special manner, owing to heavy top quark. This potentially leads new flavor physics involving members of concert with adjoining generations, potential novel effects b-flavored and charm physics. We give general discussion formulation this kind physics, abstracted largely from top-color models which we elaborate detail. identify sensitive channels such accessible current future experiments....
Standard model gauge bosons propagating in two universal extra dimensions give rise to heavy spin-1 and spin-0 particles. The lightest of these, carrying Kaluza-Klein numbers (1,0), may be produced only pairs at colliders, whereas the (1,1) modes, which are heavier by a factor $\sqrt{2}$, singly produced. We show that cascade decays particles generate series closely-spaced narrow resonances $t\overline{t}$ invariant mass distribution. At Tevatron, $s$-channel production gluons electroweak...
The little Higgs model provides an alternative to traditional candidates for new physics at the TeV scale. heavy gauge bosons predicted by this should be observable Large Hadron Collider (LHC). We discuss how LHC experiments could test studying production and decay of these particles.
We derive constraints on the Randall-Sundrum scenario with standard model fields in bulk. These result from tree level effects associated deformation of zero mode wave functions W and Z once electroweak symmetry is broken. Recently Cs\'aki, Erlich Terning pointed out that this implies large contributions to oblique parameters. Here we find when fermions are allowed bulk couplings zero-mode also affected. perform a fit observables, assuming universal fermion masses including all effects,...
We study the production and decay of neutral scalars pseudoscalars at hadron colliders, in theories where top quark mass is result a $t\overline{t}$ condensate. show that dominant channel for masses below threshold flavor changing mode $\mathrm{tc}$. This consequence nonuniversal nature underlying interactions all top-condensation models provides model-independent signature these scenarios. an upgraded Tevatron sensitive to sizable region interesting parameter space CERN Large Hadron...
Recently, realistic theories of electroweak symmetry breaking have been constructed in which the is broken by boundary conditions imposed at a higher dimensional spacetime. These equivalent 4D dual descriptions, dynamically nontrivial infrared dynamics some gauge interaction, whose coupling $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}$ and size N satisfy ${g}^{2}N\ensuremath{\gtrsim}16{\ensuremath{\pi}}^{2}.$ Such allow one to calculate radiative corrections, including oblique parameters...
We derive a condition the short distance coefficients governing $b\to (s,d)\ell^+\ell^-$ transitions must satisfy in order for forward-backward asymmetry to vanish exclusive modes $B\to (K^*,\rho)\ell^+\ell^-$. This relation, which is satisfied standard model, involves coefficient entering s\gamma$ as well one of additional Wilson present leptonic modes. show that resulting relation largely free hadronic uncertainties, thus constituting reliable test model rare B decays.
We address standard model predictions for flavor-changing radiative transitions of the pseudoscalar charm mesons. Short-distance contributions in D are contrasted with those B decays. A full analysis is presented c\ensuremath{\rightarrow}u+\ensuremath{\gamma} electromagnetic penguin amplitude QCD corrections included. Given importance long-range effects sector, special attention paid to such as vector dominance and pole amplitudes. number two-body final states exclusive decays considered...
We study the potential of B\ensuremath{\rightarrow}${\mathit{K}}^{(\mathrm{*})}$${\mathit{l}}^{+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$ decays as tests standard model. After discussing reliability theoretical predictions for hadronic mix elements involved, we examine impact different new physics scenarios on various observables. show that angular information in B\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$${\mathit{l}}^{+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$ together with...
We show that CP asymmetries in $b\to s$ hadronic decays are potentially affected by the presence of massive color-octet particles strongly coupled to third generation quarks. Theories with warped extra dimensions provide natural candidates Kaluza-Klein excitations gluons scenarios where flavor-breaking bulk fermion masses results localization wave-functions. Topcolor models, which a new gauge interaction leads top-condensation and large top mass, also result these states TeV . find effects...
We compute the photon spectrum and rate for decays B(D)\ensuremath{\rightarrow}l${\ensuremath{\nu}}_{\mathit{l}}$ \ensuremath{\gamma}. These photonic modes constitute a potentially large background purely leptonic which are used to extract heavy meson decay constants. While D\ensuremath{\rightarrow}l\ensuremath{\nu}\ensuremath{\gamma} is small, radiative in B case could be of comparable magnitude or even larger than B\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}. This would affect...
This chapter of the "Flavor in era LHC" workshop report discusses flavor-related issues production and decays heavy states at LHC high momentum transfer Q, both from experimental theoretical perspective. We review top quark physics, discuss flavor aspects several extensions standard model, such as supersymmetry, little Higgs models or with extra dimensions. includes discovery aspects, well measurement properties these states. also present publicly available computational tools related to this topic.
We review the current status of flavor-changing neutral currents in charm sector. focus on standard-model predictions and identify main sources theoretical uncertainties both [Formula: see text] mixing rare decays. The potential these observables for constraining short-distance physics standard model its extensions is compromised by presence large nonperturbative effects. examine possible discovery windows which can be tested study effects various to model. experimental situation future...
We present a systematic analysis of the ${B}^{(*)}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\ell}\ensuremath{\nu}$ weak decay form factors to order $\frac{1}{{m}_{b}}$ in heavy quark effective theory, including discussion renormalization-group effects. These processes are described by set ten universal functions (two at leading order, and eight $\frac{1}{{m}_{b}}$, which defined terms matrix elements operators theory. In soft pion limit, theory yields normalization conditions for...
We investigate the collider signals associated with scalar quirks (squirks) in folded supersymmetric models. As opposed to regular superpartners models these particles are uncolored, but instead charged under a new confining group, leading radically different signals. Because of strong dynamics, squirks that pair produced do not hadronize separately, rather form highly excited bound state. The squirkonium loses energy radiation before annihilating back into standard model particles....