# Blogs Blogs

## Zapraszamy na seminarium 14.12.2021

Dear All,

we have a pleasure to invite you to the Particle Theory Seminar on Tuesday, November 23 at 12:15:

Prof. Laurent Lellouch (CNRS & Aix-Marseille U.)

Twenty years ago in an experiment at Brookhaven National Laboratory, physicists measured the muon's anomalous magnetic moment, $a_\mu=(g_\mu-2)/2$, with a remarkable precision of 0.54 parts per million. Since then, the standard model prediction for $a_\mu$ has exhibited a discrepancy with experiment of over 3 standard deviations, raising the tantalizing possibility of physical particles or forces as yet undiscovered. On April 7 a new experiment at Fermilab presented its first results, brilliantly confirming Brookhaven's measurement and bringing the discrepancy with the standard model to a near discovery level of 4.2 sigma. To fully leverage this and future measurements, and possibly claim the presence of new fundamental physics, it is imperative to check the standard model prediction with independent methods, and to reduce its uncertainties. After an introduction and a discussion of the current experimental and theoretical status of $a_\mu$, I will present a precise lattice QCD calculation, by the BMW collaboration, of the contribution to this quantity that most limits the precision of the standard model prediction.  The result of this calculation significantly reduces the gap between the standard model and experiment, and suggests that new physics may not be needed to explain the current, experimental, world-average value of $a_\mu$.

Seminar will be on-line, however local people are encouraged to meet in the seminar room D-2-02. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium EIC

Dear Members of the PL EIC Community,

I would like to invite you to the EIC PL Seminar on 13th December at

Speaker: dr hab. Tolga Altinoluk (NCBJ)

Abstract

Color Glass Condensate (CGC) is the effective theory that is used to study high energy hadronic collisions. One of the key approximations adopted in the CGC framework is the so-called eikonal approximation. In this approximation, one neglects all power-suppressed energy corrections and just keeps the leading contribution. While this approximation is very successful and powerful tool to describe the asymptotically high energy scatterings, in reality the scattering energies that are reached in the experiments are limited. In this talk, we present a systematic way to include subeikonal corrections in the CGC calculations which are expected to be sizable for future EIC phenomenology.

https://www.gotomeet.me/NCBJmeetings/electron-ion-collider

Access Code: 395-721-853

## Zapraszamy na seminarium 7.12.2021

Dear All,

we have the pleasure to invite you to the Particle Theory Seminar on Tuesday, December 7 at 12:15:

Dr. Tomasz Stebel
(IFT)

Czy sieć neuronowa może nauczyć się fizyki? (część II) (ODWOŁANE)

Seminar will be on-line, however local people are encouraged to meet in the seminar room D-2-02. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 30.11.2021

Dear All,

we have a pleasure to invite you to the Particle Theory Seminar on Tuesday, November 30 at 12:15:

Dr. Tomasz Stebel
(IFT)

Czy sieć neuronowa może nauczyć się fizyki?

Seminar will be on-line, however local people are encouraged to meet in the seminar room D-2-02. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 23.11.2021

Dear All,

we have a pleasure to invite you to the Particle Theory Seminar on Tuesday, November 23 at 12:15:

Dr. Savvas Zafeiropoulos
(Aix Marseille Univ., Université de Toulon)

The extraction of light cone parton distributions from lattice quantum chromodynamics The light-cone definition of Parton Distribution Functions (PDFs) does not allow for a direct ab initio determination employing methods of Lattice QCD simulations that naturally take place in Euclidean spacetime. In this presentation we focus on pseudo-PDFs where the starting point is the equal time hadronic matrix element with the quark and anti-quark fields separated by a finite distance. We focus on Ioffe-time distributions, which are functions of the Ioffe-time ν, and can be understood as the Fourier transforms of parton distribution functions with respect to the momentum fraction variable 𝑥. We present lattice results for the case of the nucleon and the pion addressing among others the physical point and continuum extrapolations. We also incorporate our lattice data in the NNPDF framework treating them on the same footing as experimental data and discuss in detail the different sources of systematics in the determination of the non-singlet PDFs.

Seminar will be on-line, however local people are encouraged to meet in the seminar room D-2-02. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium EIC

Dear Members of the PL EIC Community,

I would like to invite you to the EIC PL Seminar on 15th November at

Speaker: Herve Moutarde (IRFU, CEA, Université Paris-Saclay)

Title: Precision 3D hadron structure in the EIC perspective

Abstract:

Three-dimensional hadron structure constitutes a significant part of the physics program to be investigated on future electron-ion colliders.

This topic has benefited from two decades of experimental investigations which mostly provided direct constraints on quark distributions. This contrasts with gluon distributions which can be accessed either indirectly through careful phenomenological analysis of accurate measurements, or directly by probing the adequate kinematic domain. In both cases a unified theoretical description is required to provide a full quantitative understanding of the 3D parton structure of hadrons.

https://www.gotomeet.me/NCBJmeetings/electron-ion-collider

For access code please email to piotr dot korcyl at uj dot edu dot pl

## Zapraszamy na seminarium 16.11.2021

Dear All,

we have a pleasure to invite you to the Particle Theory Seminar on Tuesday, November 16 at 12:15:

Dr. Masoud Shokri
(IPM Institute For Research In Fundamental Sciences, Teheran, Iran
& Frankfurt University, Germany) "Causal instabilities of the Chern-Simons magnetohydrodynamics" This talk presents a novel instability in the Chern-Simons (or axionic) magnetohydrodynamics (MHD), arising from the spatial inhomogeneity of the axion-like field. In particular, this instability amplifies the Alfven waves in certain regions of spacetime in a way that is clearly parity-violating. The Aflven velocity reaches the speed of light in such regions, but it never exceeds it.
Seminar will take place in the seminar room D-2-02, however, we plan to have it in hybrid mode. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 9.11.2021

Dear All,

we have a pleasure to invite you to the Particle Theory Seminar on Tuesday, November 9 at 12:15:

dr hab. Krzysztof Cichy (UAM, Poznań)

"Phase structure and real-time dynamics of the Thirring model from tensor networks".

Seminar will take place in the seminar room D-2-02, however, we plan to have it in hybrid mode. People interested in the on-line participation are kindly requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 26.10.2021

Dear All,

We have the pleasure to invite you to the Particle Theory Seminar on Tuesday,

October 26 at 12:15:

Dr. Tomasz Korzec  (University of Wuppertal)

Decoupling in QCD and its Application to Renormalization Problems

Seminar will take place in the seminar room D-2-02, however, we plan to have it

in hybrid mode. People interested in the on-line participation are kindly

requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 19.10.2021

We have the pleasure to invite you to the Particle Theory Seminar on Tuesday,

October 19 at 12:15:

Speaker: Dr Victor Ambrus (West University of Timişoara and Univ. of Frankfurt)

Title: Helical effects for thermal fermions

Abstract: Recent evidence from relativistic heavy ion collisions (HIC)
experiments confirmed the global significance of the vorticity to
polarisation transfer through the spin-orbit coupling predicted by the
Dirac equation. A well-known example is the Chiral vortical effect (CVE)
linking the flow of chirality to the local medium vorticity. This talk
focusses on the novel helical vortical effect (HVE), which predicts also
a flow of helicity. Used together, the CVE and HVE constitute a
promising tool to analyze the polarization asymmetry between matter and
anti-matter observed in lower-energy collisions. The thermodynamical
modelling of helicity imbalance through the helicity chemical potential
is proposed and its impact on wave-like excitations (the
Helical-vortical wave) and the QCD phase diagram is discussed.

Seminar will take place in the seminar room D-2-02, however, we plan to have it

in hybrid mode. People interested in the on-line participation are kindly

requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 12.10.2021

We have the pleasure to invite you to the Particle Theory Seminar on Tuesday,

October 12 at 12:15:

Piotr Korcyl (IFT, UJ)

"Digging in the numerics of the JIWMLK evolution equation"

Seminar will take place in the seminar room D-2-02, however, we plan to have it

in hybrid mode. People interested in the on-line participation are kindly

requested to let us know by email and we will send zoom coordinates.

## Zapraszamy na seminarium 8.6.2021

We have a pleasure to invite you to the Particle Theory Seminar on Tuesday, June 8 at 12:15:

Prof. Romuald Janik (IFT, UJ)
Domain walls in confining theories, holography and extended hydrodynamics

Seminar will take place on the Zoom platform (coordinates upon request by email)

## Zapraszamy na seminarium 1.6.2021

We have a pleasure to invite you to the Particle Theory Seminar on Tuesday, June 1 at 12:15:

Prof. Christophe Royon (University of Kansas)

Title
=======
Measuring intact protons at the LHC: From the odderon discovery to the search for axion-like particles

Abstract
==========
In the first part of the talk, we will describe the odderon discovery by the TOTEM and D0 experiments. The analysis compares the p pbar elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV. The two data sets disagree at the 3.4\$ sigma level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering, leading to a combined significance larger than 5 sigma.
In a second part of the talk, we will describe the perspective on the search for quartic anomalous couplings and axion-like particles using tagged protons in the final state, leading to sensitivities to beyond standard model physics that improve by 2 to 3 orders of magnitude on the coupling. We will finish by decribing briefly the ultra fast silicon detectors for timing measurements as well as for medical and cosmic ray physics applications.

Seminar will take place on the Zoom platform (coordinates upon request by email).

## Zapraszamy na seminarium 25.5.2021

We have a pleasure to invite you to the Particle Theory Seminar on

Tuesday, May 25, 2021 at 12:15

Dr. Michał Eckstein (Jagiellonian University)

Probing quantum foundations at subnuclear scales

Abstract: The standard model of particle physics is founded on the basic rules of quantum mechanics. One way to seek "new physics" is to question some of these rules. In my talk I will explain how to do it in a rigorous way, using the recent development in quantum information. Along with the conceptual scheme I will discuss the challenges for its empirical implementation in the subnuclear regime.

Seminar will take place on the Zoom platform (coordinates upon request by email).

## Zapraszamy na seminarium EIC

This is a reminder that our next EIC PL seminar is on Monday, May 24, at 13:00.

Title: Jets in DIS

Speaker: prof. Krzysztof Kutak (Institute of Nuclear Physics Polish Academy of Sciences)

We meet at the usual place:

https://www.gotomeet.me/NCBJmeetings/electron-ion-collider

## Zapraszamy na seminarium 19.5.2021

We have a pleasure to invite you the Particle Theory Seminar on

WEDNESDAY (exceptional change of day), May 19, 2021 at 12:15

Prof. Stanisław Głazek (University of Warsaw)

Elementary example of exact effective-Hamiltonian computation

We present an exact computation of effective Hamiltonians for an elementary model obtained from the Yukawa theory by going to the limit of bare fermions being infinitely heavy and bare bosons being at rest with respect to the fermions that emit or absorb them. The coupling constant can be arbitrarily large. The Hamiltonians are computed by solving the differential equation of the renormalization group procedure for effective particles (RGPEP). Physical fermions, defined in the model as eigenstates of the effective Hamiltonians, are obtained in the form of an effective fermion dressed with a coherent state of effective bosons. The model computation illustrates the method that can be used in perturbative computations of effective Hamiltonians for realistic theories. It shows the mechanism by which the perturbative expansion and Tamm-Dancoff approximation increase in accuracy along the RGPEP evolution.

Seminar will take place on the Zoom platform (coordinates upon request by email).

## Zapraszamy na seminarium 11.5.2021

We have the pleasure to invite you to the Particle Theory Seminar on Tuesday, May 11 at 12:15

Speaker: dr. Kamil Serafin, Institute of Modern Physics, CAS (Chinese Academy of Sciences), Lanzhou

Title: On the description of heavy mesons using QCD of effective particles and Light Front basis approach

Seminar will take place on the Zoom platform (coordinates upon request by email).

## Zapraszamy na prezentację laboratorium HAL

Zapraszamy na prezentację laboratorium Hardware Acceleration Laboratory, która odbędzie się 6 V wygłoszoną przez Piotra Korcyla. Prezentacja jest zaplanowana na ok. 14:45/15:00.

Hardware Acceleration Laboratory ma za zadanie tworzyć pomost pomiędzy szeroko rozumianymi naukami obliczeniowymi a informatyką, informatyką techniczną i elektroniką odpowiedzialnymi za powstawanie nowych platform obliczeniowych. Mnogość tych ostatnich: CPU, GPU, FPGA, ARM, TPU, neuromorphic jak i wszystkie możliwe ich kombinacje, jak również szybkie tempo rozwijanych algorytmów, w tym tych opartych na uczeniu maszynowym i sztucznych sieciach neuronowych przekracza zwyczajowo kompetencje użytkowników będących biologami, chemikami czy fizykami. Nowa platforma w postaci laboratorium HAL ma być brakującą dotychczas międzydyscyplinarną przestrzenią gdzie możliwe będzie poszerzanie kompetencji związanych z technikami obliczeniowymi oraz wymianę doświadczeń. W prezentacji przedstawię założenia jakie kierowały nami przy współorganizowaniu laboratorium oraz cele jakie sobie stawiamy które zilustruję aktualnie prowadzonymi badaniami.

Więcej informacji:

## Zapraszamy na seminarium EIC

This is a reminder that our next EIC PL seminar is today, Monday, April 26, at 13:00.

Title: Introduction to GPDs

Speaker: prof. Jakub Wagner (National Centre for Nuclear Research)