Conference
Masterclass Day of Women and Girls in Science 2023
O próximo venres 10 de febreiro de 2023 celebraremos unha nova masterclass de física de partículas dirixida exclusivamente a alumnas de 1º bacharelato de institutos de Galicia. Impartiranse unha serie de conferencias introductorias á Física de Partículas actual e farase unha práctica por ordenador en grupos con datos reais dun experimento do CERN. Posteriormente, discutiranse os resultados mediante videoconferencia co CERN e outros centros europeos que realicen a xornada simultaneamente. Información: https://igfae.usc.es/masterclass_women_in_science/ |
Seminar
The soft and direct photon puzzles in Heavy Ion Collisions: two problems, two ideas
During heavy ion collisions (HICs) a medium of strongly interacting degrees of freedom is formed, the so-called Quark Gluon Plasma (QGP). Electromagnetic probes are produced during these events, but since they do not interact strongly, they escape virtually unscathed, carrying the information of the space-time evolution of this medium. However, we still do not fully understand their mechanisms of productions, which limits our capability for modeling, and therefore the extraction of such information. In this talk I will introduce two unsolved puzzles in the area of Heavy Ion Collisions, and two possible ideas that could help solving them. These puzzles are commonly called the soft and direct photon puzzles. The former can be understood as a consistent excess of soft electromagnetic radiation -with respect to the established models- throughout a vast array of hadronic experiments. For this section, I will explain how we anomalous radiation may be produced non-perturbatively from the back-reaction of the vacuum to a q\\bar{q} pair. The latter, the direct photon puzzle, is our inability to explain with our HIC models both the total yield and the anisotropy of the excess electromagnetic probes created by the medium (as opposed to i.e. hadronic decay). These selection of EM probes are commonly referred as direct, and hence the name. In this part of the talk, I will show how a significant increase of anisotropy in the calculated momentum anisotropies can arise due to microscopic non-equilibrium dynamics during the hadronic stages of the HIC events. |
Seminar
Leading-twist TMDs and the Sivers asymmetry within the BLFQ framework
The theoretical calculations of the hadron internal structure is one of the focuses of current high-energy physics. Basis Light-front Quantization (BLFQ) is a recently developed non-perturbative method to study the hadron structure via the Hamiltonian framework of the light-front quantum field theory. The light-front wave function obtained within this framework could be used to calculate almost all quantities signifying the hadron internal structure, like PDFs, TMDs, GPDs and DPDs. In this report, I will concentrate on the quark TMDs inside the proton within the BLFQ framework. I will show our results of all eight leading-twist TMDs of quarks inside the proton and compare them with other theoretical predictions and experimental extractions. I will also investigate the Sivers asymmetry obtained using those TMDs and compare it with existing experimental data. Location: Sala de Xuntas and Zoom: https://zoom.us/j/97561282565?pwd=eE1mSFNqcnpLOWxiKy9JejRBendNQT09 Meeting ID: 975 6128 2565 Passcode: 738971 |
Seminar
Emergent Fractons
This talk revolves about low-energy effective field theories with fractonic degrees of freedom characterised by mobility constraints. The fractonic features descend from spatially-dependent rigid symmetries, like sub-system symmetries and multipole symmetries. We focus mainly on the emergence of fractonic dynamics in standard elastic theory and generalization thereof. Elastic defects behave at low energy as fractons and they can be described as the charged objects of a dual gauge theory through Hubbard-Stratonovich duality. We propose to formulate such dual gauge theory purely in terms of standard vector gauge fields, as opposed to the customary formulation in terms of tensor gauge fields. The new formulation is promising in view of addressing some fundamental open questions related to the coupling of fractonic theories to a background geometry, relevant for their theoretical consolidation as well as for applications. If time allows, we also comment on the relation of fractons with dynamical breaking of translation symmetry and the possibility to UV complete some known fractonic models. |
Seminar
Studies of heavy-ion physics at LHCb
In addition to flavour physics programme, the LHCb experiment is capable of performing electroweak and quantum chromodynamics measurements in proton-proton, proton-lead and lead-lead collision in previously unmeasured kinematic regions due its forward rapidity coverage. In this talk, studies of vector boson and hadron production in proton-lead and lead-lead collisions are presented. The Z boson results are used to probe the proton structure while a relatively unknown low-x region is studied with charged and neutral hadron production. In addition, photon-photon and photon-nucleus interactions are studied using quarkonium production in peripheral and ultra-peripheral lead-lead collisions. Comparisons to theoretical model calculations are also discussed. |
Seminar
From high- to low-energy jets: recent progress on jet quenching phenomenology
In this talk I will review my recent work on the phenomenology of jet quenching. High-energy jets have the power to unravel the inner workings of the deconfined QCD matter produced in relativistic heavy-ion collisions. As they traverse this new phase of matter, they are modified and the imprints of the interaction are propagated in a convoluted way onto the measured observables. Different theoretical assumptions on the nature of the interaction can account for the presently available jet substructure data. I will present an experimental strategy to disentangle between models that have radically different assumptions on the ability of the medium to resolve the internal structure of a jet. Due to momentum conservation, as jets are modified by the medium, the medium becomes modified by the jets in turn. This fact becomes specially notorious when one considers lower energy jets, given their larger abundance. In the second part of the talk I will present a concurrent framework capable of evolving jets and the effective hydrodynamical description of the QGP simultaneously. Minijets are a sizeable new source of fluctutations for the system as a whole, and their presence can significantly alter the extraction of the QGP transport coefficients. |
Seminar
Long-lived particles at LHCb and around
Many extensions of the Standard Model involve the existence of long-lived particles that would escape traditional attempts at detection in generic particle physics experiments. In this seminar, we present the current status of those searches at the LHCb, and the impact the peculiar geometry of this experiment has on future prospects. We will also review the potential of the dedicated experiment, CODEX-b, which aims at completing the coverage in order to look for New Physics all over the parameter space |
Conference
Course on Light-Cone Techniques applied to QCD
This course aims to providing the basics of Light-Cone QCD, applied to hadronic wave functions, small-x physics and jet quenching. Lecturers will be:
Registration and information: https://indico.cern.ch/event/1203236/ |
Conference
Course on Light-Cone Techniques applied to QCD
This course aims to providing the basics of Light-Cone QCD, applied to hadronic wave functions, small-x physics and jet quenching. Lecturers will be:
Registration and information: https://indico.cern.ch/event/1203236/ |
Conference
Course on Light-Cone Techniques applied to QCD
This course aims to providing the basics of Light-Cone QCD, applied to hadronic wave functions, small-x physics and jet quenching. Lecturers will be:
Registration and information: https://indico.cern.ch/event/1203236/ |
