14 OCT 2024
11:00 - 12:00

Abstract:

Designers and engineers have many options to choose from when con- sidering how to join metals to non- metals for structural, electrical, and pack- aging applications. These options could include mechanical means of fastening such as screws, bolts, rivets and other fasteners, or an elevated-temperature means such as soldering or brazing. Metal-ceramic braz- ing, the topic of this article, is particularly useful for fabricating high-reliability devices such as those used in high-voltage applica- tions or requiring hermetically sealed joints. This article is intended to familiarize the designer with brazing methods commonly used to join metals to ceramics, discuss the advantages and disadvantages of each method, and show the relative tensile strengths obtained from samples fabricated using these methods.

Meeting Place:
Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually:
https://www.skyroom.online/ch/ipm-particles/journal-club

9 OCT 2024
11:00 - 12:00

Abstract:

The extraction of parton distribution functions (PDFs) and the strong coupling constant relies heavily on physical observables. Utilizing a variety of appropriate data significantly impacts proton PDFs. In this lecture I will first review the procedure for obtaining new PDF sets. Then, it will explain the constraints imposed by experimental data, such as W/Z boson production, Drell-Yan processes, and jet measurements, on various parton distributions. Finally, it will discuss how simulated data for future colliders can improve PDFs and the strong coupling constant.

Link to Join Virtually:
https://meet.google.com/bda-vsem-tuv

7 OCT 2024
11:00 - 12:00

Abstract:

Thousands of person-years have been invested in searches for New Physics (NP), the majority of them motivated by theoretical considerations. Yet, no evidence of beyond the Standard Model (BSM) physics has been found. This suggests that model-agnostic searches might be an important key to explore NP, and help discover unexpected phenomena which can inspire future theoretical developments. A possible strategy for such searches is identifying asymmetries between data samples that are expected to be symmetric within theStandard Model (SM). We propose exploiting neural networks (NNs) to quickly fit and statistically test the differences between two samples. Our method is based on an earlier work, originally designed for inferring the deviations of an observed dataset from that of a much larger reference dataset. We present a symmetric formalism, generalizing the original one; avoiding fine-tuning of the NN parameters and any constraints on the relative sizes of the samples. Our formalism could be used to detect small symmetry violations, extending the discovery potential of current and future particle physics experiments.

Based on:
https://arxiv.org/abs/2401.09530

Meeting Place:
Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually:
https://www.skyroom.online/ch/ipm-particles/journal-club

2 OCT 2024
11:00 - 12:00

Abstract:

The structure of the beta-expanded representations for the coefficients of the perturbative QCD series for the e^+e^-- annihilation Adler function and Bjorken polarized and Gross-Llewellyn Smith neutrino DIS sum rule is analysed. The product of the series for the Adler function and these Deep-inelastic scattering sum rules obeys the generalized Crewther relation, which reflects the manifestation pf the proportional to the RG Beta-function conformal symmetry breaking perturbative contribution into the amplitide of pi- gamma gamma decay / The relation of the beta-expanded represntations for these series to proper treatment of the renormalon free PT QCD variants pf the Brodsky-Lepage-Mackenzie scale fixing procedure is discussed. The relation to the perturbative quenced QCD and finite QED limits expressions, which are realized in the non-distingushed in the experimentally related conformal symmetry limit considerations is clarified.

Meeting Place:
Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually:
https://www.skyroom.online/ch/ipm-particles/seminar

30 SEP 2024
11:00 - 12:00

Abstract:

QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at TTc plays an important role in explaining the properties of strongly coupled quark-gluon plasma (sQGP) near the deconfinement temperature. In this paper, we study the phenomenon of chiral symmetry breaking and its relation to magnetic monopoles. Specifically, we study the eigenvalue spectrum of the Dirac operator in the basis of fermionic zero modes in an SU(2) monopole background. We find that as the temperature approaches the deconfinement temperature ω=0 from above, the eigenvalue spectrum has a finite density at ω=0, indicating the presence of a chiral condensate. In addition, we find the critical scaling of the eigenvalue gap to be consistent with that of the correlation length in the 3d Ising model and the BEC transition of monopoles on the lattice.

Based on:
https://arxiv.org/abs/1801.06922

Meeting Place:
Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually:
https://www.skyroom.online/ch/ipm-particles/journal-club