20 MAY 2024
11:00 - 12:00

Abstract:

It has been five years since the data sample from the LHCb detector, the first experiment optimized for heavy-flavor physics studies at a hadronic collider, was completed. These data led to many major discoveries in exotic hadron spectroscopy, which we review in this article. We supplement the experimental results with a selection of phenomenological interpretations. As the upgraded LHCb detector is expected to collect a larger data sample starting in 2024, the near- and further-future potential of the LHCb program in exotic hadron physics is also discussed.

Based on:
https://arxiv.org/abs/2403.04051

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

Link to Download the meeting's Video:
https://www.dropbox.com/scl/fi/g07jvli742wufl4bqe89z/DrAzizi-Talk.mp4?rlkey=qpm1queq09y3ust3zpes784j1&st=mwjuq5tz&dl=0

19 MAY 2024
15:00 - 16:00

Abstract:

Massive stars (those ≥8 solar masses at formation) have radiative envelopes that cannot sustain a dynamo, the mechanism that produces magnetic fields in lower-mass stars. Despite this, approximately 7% of massive stars have observed magnetic fields, the origin of which is debated. We used multi- epoch interferometric and spectroscopic observations to characterize HD 148937, a binary system of two massive stars. We found that only one star is magnetic and that it appears younger than its companion. The system properties and a surrounding bipolar nebula can be reproduced with a model in which two stars merged (in a previous triple system) to produce the magnetic massive star. Our results provide observational evidence that magnetic fields form in at least some massive stars through stellar mergers.

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

Link to Join Virtually:
https://meet.google.com/fnv-dfkk-ghb

15 MAY 2024
18:00 - 17:30

Date and time,


6-7:30pm, Wednesday 26 Ordibehesht 1403 (15 May 2024).


Venue: Online



Link

https://www.skyroom.online/ch/schoolofphysics/colloquium



Abstract


Quantum mechanics provided precise and accurate explanations for the experiments conducted at the end of the 19th century. This led to the rapid development of quantum mechanics between 1905 and 1923, capturing the scientific community's attention. At the Solvay Conference in 1927, Werner Heisenberg, a leading figure of the Copenhagen interpretation, presented the uncertainty principle within quantum mechanics. In this lecture, we will explore the significance of Heisenberg's uncertainty principle, discuss a fundamental problem in its original formulation, and introduce the entropy uncertainty relation as an alternative. Furthermore, we will investigate into quantum entanglement and quantum discord, highlighting their crucial roles in precisely determining entropy uncertainty relation.

15 MAY 2024
17:30 - 19:00

I will briefly recall the notion of stable surfaces and of the corresponding moduli space. Then I will outline a partial description of the boundary points in the case of surfaces with $K^2=1$, $p_g=2$ (joint work with Stephen Coughlan, Marco Franciosi, Julie Rana and Soenke Rollenske, in various combinations) and, time permitting, in the case of Campedelli and Burniat surfaces (joint work with Valery Alexeev).

https://zoom.us/join
Meeting ID: 9086116889
Passcode: 362880
Email: agnt@ipm.ir
Venue: , (Online)

15 MAY 2024
14:00 - 15:00

One approach toward dealing with intractable graph problems is structural parameterization which is defined as investigation of computational complexity of NP-hard graph problems measured as a function of the structural properties of the input graph. The structure of a graph can be measured using some well-known and well-studied parameters such as treewidth, tree-depth, clique-width, vertex cover and neighborhood diversity. The main question, here, is that, for an NP-hard problem, what is the algorithmic cost of generalizing a structural parameter of the input. In this talk, after introducing some of these parameters, we give a short (and not thorough) survey on the tools such as DP and ILP techniques using in investigation of the complexity of hard problems whose input space is confined on a class of graphs with a specified structure (e.g. bounded treewidth graphs). Moreover, we give a brief introduction to the theory of parameterized complexity and classifying NP-hard problems into classes such as FPT and W[1]-hard in terms of their tractability with respect to structural parameters of the input graph.

Zoom room information:
https://us06web.zoom.us/j/89600366073?pwd=RMHt0eGdvGtkaDBG1Me3y8bOLgooGh.1
Meeting ID : 896 0036 6073
Passcode : 290109
Venue: Niavaran, Lecture Hall 1

13 MAY 2024
16:00 - 18:00

Returning to the Politics: Towards a Phenomenology of the Political

13 MAY 2024
11:00 - 12:00

Abstract:

Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Two important properties of a Higgs boson are its mass and width. In this talk, I will review some results of the measurement of the Higgs boson mass and width using data from the CMS experiment.

Link to Join Virtually:
https://meet.google.com/fnv-dfkk-ghb