Results for "Carlos A. Salgado"

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Suppression of heavy flavors at RHIC & LHCSep 18 2006Some of the open questions on jet quenching are expected to be clarified by measuring heavy-flavored mesons at high transverse momentum. The formalism based on radiative in-medium energy-loss, which describes other high-pt results at RHIC, gives definite ... More
Lectures on high-energy heavy-ion collisions at the LHCJul 07 2009Some topics on heavy-ion collisions are reviewed with emphasis on those which are expected to be specially relevant at the Large Hadron Collider programme.
Jet quenchingJun 01 2005High-pt particles produced in nucleus-nucleus collisions constitute a powerful tool to study the medium properties. The energy loss resulting from the propagation of these particles in the produced medium translates into a suppression of the high-pt yields. ... More
Heavy ion collisions phenomenology overviewNov 30 2007The reach of collider energies in heavy-ion collisions has profoundly changed our understanding of QCD under extreme conditions. I review some these new developments and comment on the properties of the produced medium as extracted from experimental data, ... More
Hard QCD probes to quark-gluon plasmaJun 15 2007Completely unexplored regimes of QCD, dominated by high-density/temperature effects, are available in heavy ion experiments at collider energies. The successful RHIC program shows how relevant the high transverse momentum part of the spectrum is for the ... More
Medium-Modified Jet Shapes in Heavy-Ion CollisionsOct 03 2005Jet quenching has been established as one of the main tools to study the properties of the medium produced in heavy ion collisions. Most of the experimental effort has been, up to now, on the measurements of inclusive particle suppression. This observable ... More
Hard Probes of the Quark Gluon Plasma in Heavy Ion CollisionsSep 19 2011The medium-modifications of processes characterized by the presence of a hard scale provide the most diverse tools to characterize the properties of the matter created in high-energy nuclear collisions. Indeed, jet quenching, the suppression of particles ... More
The physics potential of proton-nucleus collisions at the TeV scaleAug 27 2011The LHC brings nuclear collisions to the TeV scale for the first time and the first data show the qualitative differences of this new regime. The corresponding phase-space available encompasses completely uncharted regions of QCD in which high-density ... More
Theory summary. Hard Probes 2012Sep 05 2012I provide a summary of the theoretical talks in Hard Probes 2012 together with some personal thoughts about the present and the future of the field.
Overview of the heavy ion session: Moriond 2006Jun 01 2006We review recent theoretical ideas and experimental data in high-energy heavy ion collisions with special emphasis in the hard probes.
Jet reshaping in heavy-ion collisionsNov 30 2007We propose a new implementation of medium effects in jet structures in which a modification of the splitting function is included at every step in the typical final state parton shower. Although the main application of this new formalism will be at the ... More
Heavy ions theory reviewSep 18 2006Some of the new developments in the theory of heavy ion collisions are reviewed. Much of the last progress have been triggered by the high energies available at RHIC. In the near future, the LHC will extend the energy reach in heavy ions by a factor thirty ... More
RHIC results from LHC perspectivesOct 05 2005RHIC data opens new ways of characterizing the medium created in a heavy ion collision by measuring particles with high transverse momentum. In addition to the observation of the predicted jet quenching, the new data on particle correlations indicate ... More
Compatibility of neutrino DIS data and global analyses of parton distribution functionsApr 19 2010Jul 07 2010Neutrino\antineutrino deep inelastic scattering (DIS) data provide useful constrains for the flavor decomposition in global fits of parton distribution functions (PDF). The smallness of the cross-sections requires the use of nuclear targets in the experimental ... More
Neutrino-nucleus DIS data and their consistency with nuclear PDFsJun 11 2013In this talk, we discuss the compatibility of different deeply inelastic neutrino-nucleus data sets and the universal nuclear PDFs. This is an issue that has lately been investigated by different groups but the conclusions have been surprisingly contradictory. ... More
Consistency of neutrino DIS and the present parton distribution functionsSep 16 2010We study the nuclear effects in the neutrino\anti-neutrino-nucleon deep inelastic scattering (DIS) by comparing the NuTeV, CDHSW, and CHORUS cross-sections from Iron and Lead targets to the predictions derived from the latest parton distribution functions ... More
Constraints for the nuclear parton distributions from Z and W production at the LHCOct 26 2010Mar 11 2011The LHC is foreseen to finally bring also the nuclear collisions to the TeV scale thereby providing new possibilities for physics studies, in particular related to the electro-weak sector of the Standard Model. We study here the Z and W production in ... More
Agreement of Neutrino Deep Inelastic Scattering Data with Global Fits of Parton DistributionsFeb 08 2013Jul 02 2013The compatibility of neutrino-nucleus deep inelastic scattering data within the universal, factorizable nuclear parton distribution functions has been studied independently by several groups in the past few years. The conclusions are contradictory, ranging ... More
Determining the BDMPS transport coefficient via medium-modified fragmentation functionsSep 03 2002In nucleus-nucleus collisions at RHIC and LHC, partons produced at high transverse momentum can undergo multiple scattering within the collision region prior to fragmenting into hadrons. We have studied the resulting medium-modified fragmentation function ... More
Monte Carlo for Jet Showers in the MediumJul 27 2009Oct 04 2009The most commonly employed formalisms of radiative energy loss have been derived in the high- energy approximation. In its present form, it is reliable only for the medium modifications of inclusive particle spectra. Modifications to this formalism are ... More
Medium-induced emissions of hard gluonsApr 13 2012Oct 18 2012We present a derivation of the medium-induced gluon radiation spectrum beyond the current limitation of soft gluon emission. Making use of the path integral approach to describe the propagation of high-energy particles inside a medium, we study the limiting ... More
Calculating Quenching WeightsFeb 20 2003We calculate the probability (``quenching weight'') that a hard parton radiates an additional energy fraction due to scattering in spatially extended QCD matter. This study is based on an exact treatment of finite in-medium path length, it includes the ... More
Medium Modification of Jet Shapes and Jet MultiplicitiesOct 07 2003Oct 24 2003Medium-induced parton energy loss is widely considered to underly the suppression of high-pt leading hadron spectra in 200 GeV/A Au+Au collisions at RHIC. Its description implies a characteristic kt-broadening of the subleading hadronic fragments associated ... More
Quark-antiquark antenna splitting in a mediumOct 17 2017We study a system in which a quark-antiquark antenna emits a hard gluon in a medium, and an extra very soft emission afterwards. Considering the coherence effects in terms of the survival probability, we can describe the interaction of the $q\bar{q}g$ ... More
Medium-induced multi-photon radiationMay 29 2011We study the spectrum of multi-photon radiation off a fast quark in medium in the BDMPS/ASW approach. We reproduce the medium-induced one-photon radiation spectrum in dipole approximation, and go on to calculate the two-photon radiation in the Moli\`{e}re ... More
Jet Quenching in Heavy Ion Collisions from AdS/CFTMay 29 2008The phenomenon of jet supression observed in highly energetic heavy ion collisions is discussed. The focus is devoted to the stunning applications of the AdS/CFT correspondence to describe these real time processes, hard to be illuminated by other means. ... More
Introductory lectures on jet quenching in heavy ion collisionsDec 20 2007Jet quenching has become an essential signal for the characterization of the medium formed in experiments of heavy-ion collisions. After a brief introduction to the field, we present the full derivation of the medium-induced gluon radiation spectrum, ... More
Jet Shapes in Opaque MediaJul 26 2006We present general arguments, based on medium-induced radiative energy loss, which reproduce the non-gaussian shapes of away-side di-jet azimuthal correlations found in nucleus-nucleus collisions at RHIC. A rather simple generalization of the Sudakov ... More
A Dynamical Scaling Law for Jet TomographyApr 18 2002Medium modifications of parton fragmentation provide a novel tomographic tool for the study of the hot and dense matter created in ultrarelativistic nucleus-nucleus collisions. Their quantitative analysis, however, is complicated by the strong dynamical ... More
Q-PYTHIA - a Monte Carlo implementation for jet quenchingJun 03 2009RHIC experiments have established jet quenching as a fundamental tool in the study of hot matter in heavy-ion collisions. The energy reached is enough for high-pT inclusive particle studies and one- or two-particle correlations up to pT= 10-20 GeV. The ... More
Nuclear shadowing in Glauber-Gribov theory with Q2-evolutionMar 15 2010We consider deep inelastic scattering off nuclei in the Regge limit within the Glauber-Gribov model. Using unitarized parton distribution functions for the proton, we find sizeable shadowing effects on the nuclear total and longitudinal structure functions, ... More
Antiangular Ordering of Gluon Radiation in QCD MediaSep 15 2010Mar 16 2011We investigate angular and energy distributions of medium-induced gluon emission off a quark-antiquark antenna in the framework of perturbative QCD as an attempt toward understanding, from first principles, jet evolution inside the quark-gluon plasma. ... More
Measuring The Collective Flow With JetsMay 31 2004In nucleus--nucleus collisions, high-pT partons interact with a dense medium, which possesses strong collective flow components. Here, we demonstrate that the resulting medium-induced gluon radiation does not depend solely on the energy density of the ... More
Medium-Induced Gluon Radiation off Massive Quarks Fills the Dead ConeDec 08 2003We calculate the transverse momentum dependence of the medium-induced gluon energy distribution radiated off massive quarks in spatially extended QCD matter. In the absence of a medium, the distribution shows a characteristic mass-dependent depletion ... More
Energy loss and (de)coherence effects beyond eikonal approximationJul 30 2014Oct 21 2014The parton branching process is known to be modified in the presence of a medium. Colour decoherence processes are known to determine the process of energy loss when the density of the medium is large enough to break the correlations between partons emitted ... More
EPPS16 - Bringing nuclear PDFs to the LHC eraFeb 02 2018We report on EPPS16, the first global analysis of nuclear parton distribution functions (nPDFs) to include LHC data. Also for the first time, a full flavour dependence of nPDFs is allowed. While the included Z and W data are found to have insufficient ... More
The EPPS16 nuclear PDFsSep 25 2017We report on EPPS16 - the first analysis of NLO nuclear PDFs where LHC p-Pb data (Z, W, dijets) have been directly used as a constraint. In comparison to our previous fit EPS09, also data from neutrino-nucleus deeply-inelastic scattering and pion-nucleus ... More
EPPS16: Nuclear parton distributions with LHC dataDec 17 2016Mar 22 2017We introduce a global analysis of collinearly factorized nuclear parton distribution functions (PDFs) including, for the first time, data constraints from LHC proton-lead collisions. In comparison to our previous analysis, EPS09, where data only from ... More
EPS09s and EKS98s: Impact parameter dependent nPDF setsNov 09 2012In our recent study we have determined two new spatially dependent nuclear PDF (nPDF) sets, EPS09s and EKS98s. With these, the hard-process cross-sections can be calculated in different centrality classes consistently with the globally analyzed nPDFs ... More
Inclusive prompt photon production in nuclear collisions at RHIC and LHCMar 08 2011Apr 12 2011Nuclear modification factors of inclusive prompt photon production in d-Au collisions at RHIC and p-Pb collisions at the LHC are provided at different rapidities. The calculations are performed at NLO accuracy using the EPS09 NLO nuclear parton distribution ... More
A perturbative QCD study of dijets in p+Pb collisions at the LHCAug 30 2013Oct 11 2013Inspired by the recent measurements of the CMS collaboration, we report a QCD study of dijet production in proton+lead collisions at the LHC involving large-transverse-momentum jets, $p_T \gtrsim 100$ GeV. Examining the inherent uncertainties of the next-to-leading ... More
Extracting the impact parameter dependence of the nPDFs from the EKS98 and EPS09 global fitsOct 23 2012As all the globally fitted nuclear PDFs (nPDFs) have been so far impact parameter independent, it has not been possible to calculate the hard process cross sections in different centrality classes consistently with the global analyses. In \cite{Helenius:2012wd} ... More
The present status of the EPS nuclear PDFsSep 16 2010The recent global analyses of the nuclear parton distribution functions (nPDFs) lend support to the validity of the factorization theorem of QCD in high-energy processes involving bound nucleons. With a special attention on our latest global analysis ... More
EPS09 - Nuclear PDFs and Their Uncertainties at NLOJun 23 2009Sep 21 2009In this talk, we present our recent next-to-leading order (NLO) nuclear parton distribution functions (nPDFs), which we call EPS09. As an extension to earlier NLO analyses, we supplement the deep inelastic scattering and Drell-Yan dilepton data by inclusive ... More
Bayesian reweighting of nuclear PDFs and constraints from proton-lead collisions at the LHCSep 20 2013New hard-scattering measurements from the LHC proton-lead run have the potential to provide important constraints on the nuclear parton distributions and thus contributing to a better understanding of the initial state in heavy ion collisions. In order ... More
Towards a consistent description of in-medium parton branchingMay 25 2015Ultra-relativistic heavy-ion collisions are a window of opportunity to study QCD matter under extreme conditions of temperature and density, such as the quark-gluon plasma. Among the several possibilities, the study of jet quenching - generic name given ... More
Impact-parameter dependent nuclear parton distribution functions: EPS09s and EKS98s and their applications in nuclear hard processesMay 24 2012We determine the spatial (impact parameter) dependence of nuclear parton distribution functions (nPDFs) using the $A$-dependence of the spatially independent (averaged) global fits EPS09 and EKS98. We work under the assumption that the spatial dependence ... More
EPPS16 - First nuclear PDFs to include LHC dataOct 16 2017We present results of our recent EPPS16 global analysis of NLO nuclear parton distribution functions (nPDFs). For the first time, dijet and heavy gauge boson production data from LHC proton-lead collisions have been included in a global fit. Especially, ... More
Angular-ordered parton showers with medium-modified splitting functionsSep 28 2009Dec 07 2009Modified Altarelli-Parisi splitting functions were recenty proposed to model multi-parton radiation in a dense medium and describe jet quenching, one of most striking features of heavy-ion collisions. We implement medium-modified splitting functions in ... More
A unitarized model of inclusive and diffractive DIS with Q2-evolutionJan 18 2010We discuss the interplay of low-x physics and QCD scaling violations by extending the unified approach describing inclusive structure functions and diffractive production in $\gamma* p$ interactions proposed in previous papers, to large values of Q2. ... More
Medium-induced gluon radiation and colour decoherence beyond the soft approximationJul 02 2014Feb 12 2015We derive the in-medium gluon radiation spectrum off a quark within the path integral formalism at finite energies, including all next-to-eikonal corrections in the propagators of quarks and gluons. Results are computed for finite formation times, including ... More
Relating high-energy lepton-hadron, proton-nucleus and nucleus-nucleus collisions through geometric scalingJul 01 2004A characteristic feature of small-x lepton-proton data from HERA is geometric scaling -- the fact that over a wide range of x and Q^2 all data can be described by a single variable $Q^2/Q_{sat}^2(x)$, with all x-dependence encoded in the so-called saturation ... More
Medium-induced gluon radiation beyond the eikonal approximationApr 28 2014Jul 29 2014In this work we improve existing calculations of radiative energy loss by computing corrections that implement energy-momentum conservation, previously only implemented a posteriori, in a rigorous way. Using the path-integral formalism, we compute in-medium ... More
Modeling the Impact Parameter Dependence of the nPDFs With EKS98 and EPS09 Global FitsJul 30 2012Oct 04 2012So far the nuclear PDFs (nPDFs) in the global DGLAP fits have been taken to be spatially independent. In this work, using the $A$-dependence of the globally fitted sets EPS09 and EKS98, we have determined the spatial dependence of the nPDFs in terms of ... More
EPS09 - Global NLO analysis of nuclear PDFsJun 16 2009In this talk, we present our recent work on next-to-leading order (NLO) nuclear parton distribution functions (nPDFs), which we call EPS09. As an extension to earlier NLO analyses, we complement the deep inelastic scattering and Drell-Yan dilepton data ... More
Low-pT Collective Flow Induces High-pT Jet QuenchingNov 26 2004Data on low-pT hadronic spectra are widely regarded as evidence of a hydrodynamic expansion in nucleus-nucleus collisions. In this interpretation, different hadron species emerge from a common medium that has built up a strong collective velocity field. ... More
Testing the Color Charge and Mass Dependence of Parton Energy Loss with Heavy-to-light Ratios at RHIC and LHCJan 24 2005The ratio of nuclear modification factors of high-pT heavy-flavored mesons to light-flavored hadrons (``heavy-to-light ratio'') in nucleus-nucleus collisions tests the partonic mechanism expected to underlie jet quenching. Heavy-to-light ratios are mainly ... More
Dynamical quenching weights in an expanding mediumJan 01 2019In this work, we extend the resummation of multiple medium-induced emissions to apply to dynamically expanding media. This is done by recasting the quenching weight as the solution of a rate equation with medium-induced partonic splitting functions that ... More
Color coherence in a heavy quark antenna radiating gluons inside a QCD mediumMar 19 2014We compute the color coherence effects for soft gluon radiation off antennas containing heavy quarks in the presence of a QCD medium - in color singlet, triplet or octet global states. This work completes the studies of antenna radiation inside a medium ... More
The radiation pattern of a QCD antenna in a dilute mediumDec 21 2011Apr 25 2012Radiative interferences in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study these effects, we derive the gluon emission ... More
The radiation pattern of a QCD antenna in a dense mediumMay 25 2012We calculate the radiation spectrum off a qq-bar pair of a fixed opening angle theta_qq-bar traversing a medium of length L. Multiple interactions with the medium are handled in the harmonic oscillator approximation, valid for soft gluon emissions. We ... More
Onset of color decoherence for soft gluon radiation in mediumJul 05 2011We report on recent studies of the phenomenon of color decoherence in jets in QCD media. The effect is most clearly observed in the radiation pattern of a quark-antiquark antenna, created in the same quantum state, traversing a dense color deconfined ... More
In-medium jet evolution: interplay between broadening and decoherence effectsDec 29 2015Feb 19 2016The description of the modifications of the coherence pattern in a parton shower, in the presence of a QGP, has been actively addressed in recent studies. Among the several achievements, finite energy corrections, transverse momentum broadening due to ... More
Universal geometrical scaling of the elliptic flowMay 09 2014Aug 12 2015The presence of scaling variables in experimental observables provide very valuable indications of the dynamics underlying a given physical process. In the last years, the search for geometric scaling, that is the presence of a scaling variable which ... More
An analysis of the impact of LHC Run I proton-lead data on nuclear parton densitiesDec 04 2015We report on an analysis of the impact of available experimental data on hard processes in proton-lead collisions during Run I at the Large Hadron Collider on nuclear modifications of parton distribution functions. Our analysis is restricted to the EPS09 ... More
New picture of jet quenching dictated by color coherenceOct 29 2012Nov 09 2012We propose a new description of the jet quenching phenomenon observed in nuclear collisions at high energies in which coherent parton branching plays a central role. This picture is based on the appearance of a dynamically generated scale, the jet resolution ... More
AAMQS: a non-linear QCD description of new HERA data at small-xJul 04 2011We present a global analysis of available data on inclusive structure functions measured in electron-proton scattering at small values of Bjorken-x, including the latest data from the combined HERA analysis on reduced cross sections. Our approach relies ... More
Extracting $\hat{q}$ from single inclusive data at RHIC and at the LHC for different centralities: a new puzzle?Dec 20 2016We present here an extraction of the jet transport coefficient, $\hat{q}$, using RHIC and LHC single-inclusive high-$p_T$ data for different centralities. We fit a $K$-factor that determines the deviation of this coefficient from an ideal estimate, $K ... More
Coherence phenomena between initial and final state radiation in a dense QCD mediumAug 09 2013Nov 22 2013In this work we investigate medium modifications to the interference pattern between initial and final state radiation. We compute single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense ... More
Coherence and broadening effects in medium induced gluon radiationSep 11 2012Sep 21 2012Interferences between different emitters in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study such effects, we derive ... More
Probing the time structure of the quark-gluon plasma with top quarksNov 08 2017May 12 2018The tiny droplets of Quark Gluon Plasma (QGP) created in high-energy nuclear collisions experience fast expansion and cooling with a lifetime of a few $\text{fm}/c$. Despite the information provided by probes such as jet quenching and quarkonium suppression, ... More
Energy Dependence of the Cronin Effect from Non-Linear QCD EvolutionJul 14 2003The non-linear evolution of dense partonic systems has been suggested as one of the novel physics mechanisms relevant to the dynamics of hadron-nucleus and nucleus-nucleus collisions at collider energies. Here we study to what extent the description of ... More
Energy versus centrality dependence of the jet quenching parameter $\hat q$ at RHIC and LHC: a new puzzle?Jun 15 2016Aug 12 2016The central goal of jet quenching studies in high-energy nuclear collisions is the characterization of those QCD medium properties that are accessible by these probes. Most of the discussion in the last years has been focused on the determination of the ... More
A global reanalysis of nuclear parton distribution functionsMar 09 2007We determine the nuclear modifications of parton distribution functions of bound protons at scales $Q^2\ge 1.69$ GeV$^2$ and momentum fractions $10^{-5}\le x\le 1$ in a global analysis which utilizes nuclear hard process data, sum rules and leading-order ... More
Interference between initial and final state radiation in a QCD mediumJul 04 2012Sep 19 2012We investigate the color coherence pattern between initial and final state radiation in the presence of a QCD medium. We derive the medium-induced gluon spectrum of an "asymptotic" parton which suffers a hard scattering and subsequently crosses the medium. ... More
Constraining energy loss from high-$p_{\rm T}$ azimuthal asymmetriesFeb 20 2019The nuclear modification factor $R_{\rm AA}$ has been satisfactorily described by various jet quenching models. Nonetheless, all these formalisms, until very recently, underpredicted the high-$p_{\rm T}$ (> 10 GeV) elliptic flow $v_2$. We find that the ... More
A predictive phenomenological tool at small Bjorken-xSep 30 2010We present the results from global fits of inclusive DIS experimental data using the Balitsky-Kovchegov equation with running coupling.
Medium-induced soft gluon radiation in DISJul 05 2012We study color coherence effects on the medium-induced soft gluon radiation off an asymptotic quark hit by a virtual photon traversing a hot and dense QCD medium. The transverse momentum spectrum of the emitted gluon is computed at 1st order in the opacity ... More
Mapping collinear in-medium parton splittingsJul 08 2019We map the spectrum of $1\to 2$ parton splittings inside a medium characterized by a transport coefficient $\hat q$ onto the kinematical Lund plane, taking into account the finite formation time of the process. We discuss the distinct regimes arising ... More
Coherence effects and broadening in medium-induced QCD radiation off a massive $q {\bar q}$ antennaOct 19 2011Studies of medium-induced QCD radiation usually rely on the calculation of single-gluon radiation spectrum off an energetic parton traversing an extended colored medium. Recently, the importance of interference effects between emitters in the medium has ... More
Broadening in Medium-induced QCD Radiation off a $q {\bar q}$ AntennaAug 26 2011In this contribution, the one-gluon radiation spectrum off a massive quark-antiquark ($q {\bar q}$) antenna traversing a QCD medium is calculated in the eikonal approximation. The interference between emissions from the quark and the antiquark is considered. ... More
Mass effect and coherence in medium-induced QCD radiation off a $q {\bar q}$ antennaJul 01 2011The medium-induced one-gluon radiation spectrum off a massive quark-antiquark ($q {\bar q}$) antenna traversing a colored QCD medium is calculated in this contribution. The gluon spectrum off the antenna computed at first order in the opacity expansion ... More
Extracting $\hat{q}$ in event-by-event hydrodynamics and the centrality/energy puzzleMay 03 2017In our analysis, we combine event-by-event hydrodynamics, within the EKRT formulation, with jet quenching -ASW Quenching Weights- to obtain high-$p_T$ $R_{\rm AA}$ for charged particles at RHIC and LHC energies for different centralities. By defining ... More
Next-to-eikonal corrections in the CGC: gluon production and spin asymmetries in pA collisionsApr 08 2014May 05 2014We present a new method to systematically include corrections to the eikonal approximation in the background field formalism. Specifically, we calculate the subleading, power-suppressed corrections due to the finite width of the target or the finite energy ... More
Constraint fitting of experimental data with a jet quenching model embedded in a hydrodynamical bulk mediumJul 03 2009Dec 03 2009We present a global fit to single- and double-inclusive suppression data of high-$p_T$ particles in central Au+Au collisions at top RHIC energy. We also include in this analysis data on heavy quarks via their D and B meson semi-leptonic decays (i.e. non-photonic ... More
In-medium antenna radiation in t-channelJul 06 2012The color coherence effects in the medium modification to the initial state radiation are studied via a simple setup which allows these effects to be pronounced. The medium-induced gluon radiation spectrum off a hard quark which suffers a highly virtual ... More
Jet quenching as a probe of the initial stages in heavy-ion collisionsFeb 08 2019Jet quenching provides a very flexible variety of observables which are sensitive to different energy- and time-scales of the strongly interacting matter created in heavy-ion collisions. Exploiting this versatility would make jet quenching an excellent ... More
x_F-dependence of J/Psi suppression in pA collisionsMay 22 2001Coherence effects are important in the description of collisions with extended objects as nuclei. At fixed target energies and small x_F, the coherence length of the fluctuation containing the $c\bar c$ is small and the usual nuclear absorption model ... More
Medium Modification of the Jet PropertiesMar 16 2004In the case that a dense medium is created in a heavy ions collision, high-E_t jets are expected to be broadened by medium-modified gluon emission. This broadening is directly related, through geometry, to the energy loss measured in inclusive high-p_t ... More
Jets in heavy ion collisionsJul 08 2003High energetic particles traversing a dense medium lose a sizable part of their energy in form of gluon radiation. As a result, the rate of high-$p_t$ particles is expected to be suppressed in heavy ion collisions with respect to the proton case. Recent ... More
Medium-induced gluon radiation and jet quenching in heavy ion collisionsDec 09 2003Dec 10 2003In this brief review, I summarize the new developments on the description of gluon radiation by energetic quarks traversing a medium as well as the observable consequences in high-energy heavy ion collisions. Information about the initial state is essential ... More
Non-additive simple potentials for pre-programmed self-assemblySep 09 2014A major goal in nanoscience and nanotechnology is the self-assembly of any desired complex structure with a system of particles interacting through simple potentials. To achieve this objective, intense experimental and theoretical efforts are currently ... More
Dijets in p+Pb collisions and their quantitative constraints for nuclear PDFsAug 20 2014We present a perturbative QCD analysis concerning the production of high-pT dijets in p+Pb collisions at the LHC. The next-to-leading order corrections, scale variations and free-proton PDF uncertainties are found to have only a relatively small influence ... More
Self-assembly of anisotropic soft particles in two dimensionsJan 26 2012The self assembly of core-corona discs interacting via anisotropic potentials is investigated using Monte Carlo computer simulations. A minimal interaction potential that incorporates anisotropy in a simple way is introduced. It consists in a core-corona ... More
The Einstein-Maxwell system in 3+1 form and initial data for multiple charged black holesJul 07 2009Nov 29 2009We consider the Einstein-Maxwell system as a Cauchy initial value problem taking the electric and magnetic fields as independent variables. Maxwell's equations in curved spacetimes are derived in detail using a 3+1 formalism and their hyperbolic properties ... More
On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized PhotonsOct 28 2013Dec 16 2013Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory ... More
Baryon stopping and hyperon enhancement in the improved dual parton modelMar 19 1999We present an improved version of the dual parton model which contains a new realization of the diquark breaking mechanism of baryon stopping. We reproduce in this way the net baryon yield in nuclear collisions. The model, which also considers strings ... More
Hyperon Enhancement in the Dual Parton ModelJul 21 2000We review the two sources of hyperon enhancement in the dual parton model: strings originating from diquark-antidiquark pairs in the nucleon sea and net baryons containing two or three sea quarks with a yield controlled by the observed stopping. We show ... More
A geometrical estimation of saturation of partonic densitiesNov 28 2000Sep 20 2001We propose a new criterium for saturation of the density of partons both in nucleons and nuclei. It is applicable to any multiple scattering model which would be used to compute the number of strings exchanged in $ep$ and $eA$ collisions. The criterium ... More
Gluon distributions in nuclei at small x: guidance from different modelsJan 23 2003Different approaches to gluon shadowing at small x are reviewed. Some available results relevant for RHIC and LHC are compared.