Two Days with Particle Physics Workshop

17 Nov 2021, 08:00 → 18 Nov 2021, 20:00 Asia/Tehran

Shehu AbdusSalam (Shahid Beheshti University (IR))

For brightening and widening the windows for collaborations, a series of conferences titled "Two Days with Fundamental Particles" has been initiated at the Department of Physics, Shahid Beheshti University, Tehran. This conference will be the third of the series. It is aimed at enhancing interactions between professors, researchers and students. Speakers will present their topics from within the broad field of particle physics in a pedagogic manner. They will also present the recent developments and future prospects of their research subjects. There are possibilities for presentations by PhD students.

 

The meetings entry point is https://www.sbu.ac.ir/web/webinar

posterv4.pdf

Wednesday, 17 November

14:20 → 14:30 Meeting opening

Speaker: Shehu AbdusSalam (Shahid Beheshti University (IR))

slides.pdf

14:30 → 15:50 Reminiscences of Steven Weinberg and his Impact in High Energy Physics

Speaker: Fernando Quevedo (University of Cambridge)

StevenWeinbergIran.pdf

15:50 → 16:00 Break

16:00 → 17:20 Quantum Chromodynamics at Hadron Colliders

Speaker: Francesco Hautmann (University of Antwerpen)

0Talk_02_Francesco_Hautmann.pdf

0Talk_02_Francesco_Hautmann_References.pdf

Thursday, 18 November

09:30 → 10:00 Majorana Fermions in High Energy and Solid State Physics

It is known that a Dirac-type matrix equation governs surface excitations in the superconductor-topological insulator system and Majorana zero-energy modes (MZM) arise as solutions of such an equation in the presence of vortices. Among other setups to realize MZMs, one can mention a p-wave superconductor with a non-relativistic kinetic term and a vortex order parameter. On the other hand, it is known that Majorana’s original work was not restricted only to zero-energy modes, which are static solutions of the Majorana equation. His approach was quite general and he introduced a whole field, called Majorana Fermions. We review these concepts and their importance both in the high anergy physics and the solid state physics context.

Speaker: Mehran Zahiri Abyaneh (PhD)

10:00 → 11:00 String Swampland Conjectures and Implications for Particle Phenomenology and de Sitter Cosmology

The string swampland conjectures are a list of criteria a low energy effective field theory (EFT) must satisfy to be UV completed in quantum gravity (QG). These conjectures are based on examples from string theory constructions. If an EFT does not respect these conditions it cannot be constructed from a string compactification. These criteria can be used in a bottom-up approach as a model selection principle or as constraints on an EFT parameter space. In this talk, we review some conjectures (including weak gravity conjecture, dS conjecture, trans-Planckian censorship conjecture, adS conjecture, distance conjecture, the Festina Lente bound) and study their implications for particle phenomenology and de Sitter cosmology.

Speaker: Mahdi Torabian (Sharif University of Technology)

0Talk_04_Mahdi_Torabian.pdf

11:00 → 11:30 Probing bottom Yukawa couplings at future electron-proton colliders

The proposed future $ e^-p$ collider provides sufficient energies to produce the Standard Model Higgs Boson through $W^\pm$ and Z-boson fusion in charged and neutral current modes, respectively and to measure its properties. We take this opportunity to investigate the prospect of b-quark Yukawa coupling in the Standard Model Effective Field Theory framework and prob down the Wilson coefficients through the process of $ e^-p \to v_l j H $ where the Higgs boson decays to a b-quark pair. The analysis is carried out considering two different center-of-mass energies of 1.3 and 3.46 TeV as the LHeC and FCC-eh benchmarks, including a realistic simulation of the detector response and the main sources of background processes. For backgrund rejection, a multivariate analysis using BDT training method, is performed and the expected limits at 95% CL are derived on the new physics couplings for each benchmark scenario.

Speaker: Reza Jafari

0Talk_05_Jaafari.pdf

11:30 → 12:00 Break

12:00 → 13:00 CMS probes for beyond the standard model physics via Higgs boson

This talk will mainly represent a review of the standard model Higgs boson and its role in searches for new physics at the large hadron collider. In the end, the latest beyond the standard model searches through Higgs interactions being performed at the CMS experiment collaboration will be addressed.

Speaker: Maryam Zeinali (Isfahan University of Technology (IR))

SBU_talk_mzeinali.pdf

13:00 → 14:00 The generation of matter–antimatter asymmetries and hypermagnetic fields by the chiral vortical effect of transient fluctuations

Generation of matter-antimatter asymmetry and large-scale magnetic
fields in the Universe are two seemingly unrelated problems in particle physics
and cosmology which are highly intertwined in the symmetric phase of the early
Universe, due to the Abelian anomalous effects. The chiral vortical effect (CVE)
is the generation of the electric current parallel to the vorticity field in the plasma.
We show that due to the temperature-dependent chiral vortical effect, small over-
lapping transient fluctuations in the vorticity field in the plasma and temperature
of matter degrees of freedom can lead to the generation of strong hypermagnetic
fields and matter-antimatter asymmetries, all starting from zero initial values.

Speaker: S. Rostam Zadeh

0Talk_07_RostamZadeh.pdf

Abstract-Rostam Zadeh.pdf

14:00 → 14:25 Break

14:25 → 15:30 The future of Collider Physics

Speaker: Michelangelo Mangano (CERN)

Mangano_Iran.pdf

15:30 → 16:00 The effects of non-helical component of hypermagnetic field on the evolution of the matter-antimatter asymmetry, vorticity, and hypermagnetic field

The large-scale magnetic fields and the baryon asymmetry in the Universe are two important puzzles in particle physics and cosmology. In the symmetric phase of the early Universe before the electroweak phase transition (EWPT), these two seemingly unrelated problems are intertwined via the Abelian anomalous effect, $\nabla_{\mu}j^{\mu}\sim\vec{E}_{Y}.\vec{B}_{Y}$. Moreover, in imbalanced chiral plasma the magnetic and vorticity field lead to generation of electric current, which are known as the Chiral Magnetic Effect (CME) and Chiral Vortical Effect (CVE), respectively. In this talk we will show that the CVE and CME can lead to the generation and evolution of the hypermagnetic field and matter-antimatter asymmetries in the symmetric phase of the early Universe in the temperature range $100\ \mbox{GeV}\le T\le10\ \mbox{TeV}$.

Speaker: Saeed Abaaslu

0Talk_08_Abbaslu.pdf

Abstract.pdf