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Jurgen Schukraft (CERN)31/10/2017, 11:45
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Gunther Roland (Massachusetts Inst. of Technology (US))31/10/2017, 12:40
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Andreas Morsch (CERN)31/10/2017, 15:00
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Yasser Corrales Morales (Universita e INFN Torino (IT))31/10/2017, 15:55
Evidence of the presence of collective phenomena has been observed in the final state hadronic observables of the strongly-interacting system created in Pb-Pb collisions. In addition, measurements in pp and p-Pb collisions as a function of event multiplicity at LHC energies have shown some features reminiscent of collectivity. Thanks to its excellent PID capabilities and $p_{\rm T}$ coverage...
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Julius Gronefeld (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))31/10/2017, 16:30
ALICE is an experiment dedicated to the study of heavy-ion collisions at the LHC, with the aim of understanding the physics of the hot and dense deconfined medium produced in such collisions. Since the start of its second phase of running the LHC is delivering collisions of protons and lead ions at the top energy of $\sqrt{s} = 13\,\text{TeV}$ for pp and $\sqrt{s_\text{NN}} =...
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Prof. Alejandro Ayala31/10/2017, 17:25
We compute the vacuum one-loop quark-gluon vertex correction at zero
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temperature in the presence of a magnetic field. From the vertex function
we extract the effective quark-gluon coupling and show that it grows with
increasing magnetic field strength. The effect is due to a subtle
competition between the color charge associated to gluons and the color
charge associated to quarks, the former... -
Roger Hernandez-Pinto (CINVESTAV)31/10/2017, 18:00
In this talk we revisit the global QCD análisis of the parton-to-kaon fragmentation functions at next-to-leading order accuracy using the latest experimental information on single-inclusive kaon production un electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and proton-proton collisions. An excellent description of all data sets is achieved, and the remaining...
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Elena G. Ferreiro (Universidad de Santiago de Compostela)01/11/2017, 09:00
Quarkonium has been regarded as one of the golden probes to identify the phase transition from confined hadronic matter to the deconfined quark-gluon plasma (QGP) in heavy-ion collisions. Recent theoretical developments in the study of the J/ψ and ϒ families at the energies of Large Hadron Collider (LHC) are reviewed. In particular, the possible implications related to the production and...
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01/11/2017, 09:55
The unprecedented collision energies at LHC allow for a detailed investigation of quarkonium production in pp, p-Pb and Pb-Pb collisions. Since the time scales between the production of heavy quarks and their hadronisation are well separated, quarkonia are a valuable messenger from the hot and dense matter which can be created in heavy-ion collisions. Recent results indicate that also...
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Dr Pedro González Zamora (FCMF-BUAP)01/11/2017, 10:30
The ALICE experiment is dedicated to study the properties of the Quark-Gluon Plasma (QGP) which is expected to be formed in ultra-relativistic heavy ion collisions. Measurements of hadron production in pp and p-Pb collisions are of importance to understand the properties of this hot and dense medium. In pp collisions, meson spectra serve as a reference for heavy-ion collisions and add...
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Dr Benjamin Guiot (Universidad Federico Santa Maria)01/11/2017, 11:10
EPOS3 is a minimum bias Monte-Carlo event generator used for Heavy Ion Collisions. It is successful in the description of particle spectra as well as flow-like observables and includes viscous hydrodynamics expansion, hadronic cascade, and heavy quark production.
In the beginning, we will present the general features of the model and show that multiple interactions play a central role for...
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Jing Wang (Massachusetts Inst. of Technology (US))01/11/2017, 11:45
The measurement of heavy flavour production is a powerful tool to study the properties of the high-density QCD medium created in heavy-ion collisions as heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. In particular, the comparison between the nuclear modification factors (RAA) of light- and heavy-flavour...
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Ta-Wei Wang (Massachusetts Inst. of Technology (US))01/11/2017, 12:20
Beauty production and phenomena in heavy-ion collisions are considered to be one of the key measurements to address the flavour-dependence of in-medium energy loss in PbPb collisions at the LHC. The CMS experiment has excellent capabilities for measuring b-quark production thanks to the excellent performances of its muon and tracker system, allowing the measurement of J/$\Psi$ mesons from B...
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Peter Christiansen (Lund University (SE))02/11/2017, 09:00
The origin of flow-like effects in small systems, such as those produced in ultra-relativistic proton-proton and proton-lead collisions, is still widely debated. In this talk, the goal is to look at possible consequences if indeed a mini-Quark-Gluon Plasma is formed in these collisions. It is argued that this could indicate a duality between the QGP phase and the color fields in hadrons. A...
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Antonio Ortiz Velasquez (Universidad Nacional Autonoma (MX))02/11/2017, 09:55
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Dr Luis Hernandez (Instituto de Ciencias Nucleares, UNAM)02/11/2017, 10:30
We use the linear sigma model coupled to quarks to compute the effective potential beyond the mean field approximation, including the contribution of the plasma screening effects, at finite temperature and density. We determine uniquely the model coupling constants (the only free parameters in the model) and use them to study the phase diagram in the temperature-baryon chemical potential plane...
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Vytautas Vislavicius (Lund University (SE))02/11/2017, 11:20
To understand the origins of collective-like phenomena observed in pp collisions at LHC energies, underlying mechanisms have to be identified. In this context, event shape observables provide a possible tool to disentangle soft and hard contributions to particle production. We report on a study of the production of pions, kaons and protons as a function of transverse spherocity in high...
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Dr Gergely Gabor Barnafoldi (Wigner RCP Hungarian Academy of Sciences (HU))02/11/2017, 11:55
Identified hadron spectra from recent years are analyzed in the non-extensive thermodynamical framework. The Tsallis cut power-law is known to describe the p T distributions for a wide energy range, but its origin is still unknown. We pursue the physical origin of this observation by investigating the center-of-mass energy, multiplicity, mass and strangeness dependency of the Tsallis q and T...
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Dr Aditya Nath Mishra (ICN-UNAM, Mexico City, Mexico)02/11/2017, 12:30
A study of the universality of multihadron production in nucleus-nucleus and pp/{\bar p}p collisions is performed using the dependencies of the midrapidity pseudorapidity and transverse energy densities and of the mean multiplicity on the collision energy and on the number of nucleon participants, or centrality, in the energy range from a few GeV to a few TeV. The approach in which the...
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Hector Bello Martinez (Autonomous University of Puebla (MX))02/11/2017, 14:35
In this work, we propose a tool to reveal the origin of the collective-like phenomena observed in proton–proton collisions. We exploit the fundamental difference between the underlying mechanisms, color reconnection and hydrodynamics, which produce radial flow patterns in Pythia 8 and Epos 3, respectively. Specifically, we proceed by examining the strength of the coupling between the soft and...
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Sergio Arturo Iga Buitron (Universidad Nacional Autonoma (MX))02/11/2017, 15:10
The study of the charged particle production as a function of the multiplicity in small colliding systems, as pp, is an attractive tool to understand the similarities and differences between small and large colliding systems. Evidence of similarities, like coherent and collective effects, well know in AA collisions, has been found experimentally even in small systems.
Recent results of the...
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Mr Zhaozhong Shi (Massachusetts Institute of Technology)02/11/2017, 15:45
sPHENIX experiment is proposed to succeed the current PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). sPHENIX experiment is capable of measuring jets, jet correlations and upsilons to determine the temperature dependence of transport coefficients and the color screening length in the quark-gluon plasma. From January to February 2017, sPHENIX Collaboration conducted test beam...
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Maria Elena Tejeda-Yeomans (Universidad de Sonora)02/11/2017, 16:20
In this talk I will present some of the challenges and opportunities to study nuclear matter under extreme conditions using the Multi-Purpose Detector (MPD) at the Nuclotron-‐based Ion Collider fAcility (NICA) which is located at the Joint Institute for Nuclear Research (JINR), in Dubna, Rusia. I will summarize the advances made by the collaboration MExNICA within the planned program for...
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Constantinos Loizides (ORNL)02/11/2017, 17:10
Small collision systems exhibit collective effects like those seen in AA collisions, which sets the foundation to postulate the formation of a QGP even in small systems.
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While indeed most if not all observations between pPb and PbPb at the LHC look alike, clear final state effects as charged particle or jet suppression induced by parton energy loss as known from hot nuclear matter have not... -
Omar Vázquez Rueda (Universidad Nacional Autonoma (MX))02/11/2017, 17:45
In this work a study of the fractional momentum loss ($S_{\rm loss}$) as a function of the characteristic path-length ($L$) and the Bjorken energy density times the equilibration time ($\epsilon_{\rm Bj}\tau_{0}$) for heavy-ion collisions at different $\sqrt{s_{\rm NN}}$ is presented. The study has been conducted using inclusive charged particles from intermediate to large transverse momentum...
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Ran Bi (Massachusetts Inst. of Technology (US))02/11/2017, 18:10
A typical approach to study the quark gluon plasma produced in heavy ion
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collisions is to understand the passage of elementary particles through it. As
electroweak bosons such as photons and Z bosons do not participate in the
strong interaction, their correlation with jets within the same event is a
clean probe of the medium-induced energy loss of jets. With high statistics
PbPb and pp... -
Mr Federico Deganutti (The University of Kansas)02/11/2017, 18:45
As was pointed out long ago by Mueller and Tang, the BFKL hard Pomeron, at finite momentum transfer, can be investigated at hadron colliders by looking for the exclusive processes where the only observed radiation are two jets detected far apart in rapidity. The absence of any additional emission over a large rapidity region suggests that the color-singlet exchange contributes substantially to...
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Prof. Carlos Pajares (University Santiago de Compostela)03/11/2017, 09:00
Nuclear like effects are produced in pp collisions as a consequence of the clustering of color sources. In this framework are discussed the long range rapidity correlations, ridge structure, elliptic flow, multiplicity dependence of quarqonium production, pt dependence of B/M ratios and quarqonium incoherent
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production. -
Brijesh Kumar Srivastava (Purdue University (US))03/11/2017, 09:55
A possible phase transition of strongly interacting matter from hadron to
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quark-gluon plasma state has received considerable interest in the past.
What conditions are necessary in the pre-equilibrium stage to achieve
deconfinement and perhaps subsequent quark-gluon plasma formation ?
In this talk the Color String Percolation Model (CSPM) has been explored to describe the initial stages in... -
Soeren Schlichting (University of Washington)03/11/2017, 10:30
Observations of long rang azimuthal correlations in small collision systems (p+p/A) have triggered an enormous excitement in the heavy-ion community. However, it is presently unclear to what extent the experimentally observed correlations should be attributed to initial state momentum correlations and/or the final state response to the initial state geometry. Starting from a brief overview of...
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Irais Bautista Guzman (Autonomous University of Puebla (MX))03/11/2017, 11:35
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Mr Ricardo Alvarado (BUAP)03/11/2017, 12:00
We study the interplay of the contribution of bulk and shear viscosities in p-p and p-Pb collisions at LHC energies in the framework of the String Percolation Model which for high multiplicities exhibit a similar behavior as the geometric phase transition given in heavy ion collision. The results show that the bulk viscosity gives a relevant contribution to the overall viscosity of the formed system.
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Pablo Fierro03/11/2017, 12:25
We present a study of the event by event mean transverse momentum fluctuations in high multiplicity pp and p-Pb collision systems at LHC energies in the framework of the String Percolation Model as a function of multiplicity. We found that data can be naturally described by the clustering of color sources that take place in the small collision systems in a similar manner as it does in heavy...
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Martin Hentschinski (Universidad de las Americas, Puebla)03/11/2017, 12:50
We discuss possible processes which can be used to pin down the presence of high gluon densities in both photon-proton and photon-nucleus collisions. The presence of such high gluon density itself can then be argued to be characteristic for a regime of QCD where the possible on-set of gluon saturation can be observed. To this end we use the spinor helicity formalism to calculate the cross...
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Heavy-flavour quarks at the Large Hadron Collider (LHC) are produced during the initial stages in hard scatterings processes in pp and p–-Pb collisions. Due to their large masses, their production can be calculated with perturbative quantum chromodynamics (pQCD) and provide an essential baseline for the studies of heavy-flavour production in heavy-ion collisions. Measurements of heavy-flavour...
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Gunther Roland (Massachusetts Inst. of Technology (US))
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Federico Deganutti
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