7 DEC 2023
11:00 - 12:00

Abstract:

I will review , in some detail, the various derivations of the exact renormalization group equation.
Then if there is time I will discuss the holographic dual of the equation.

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

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

6 DEC 2023
11:00 - 12:00

Abstract:

In order to address open questions in the Standard Model, theoretical physicists have developed several potential theories that extend the Standard Model. In some cases, these theories may predict particles that have not yet been discovered. On the other hand, experimentalists are digging into the available data, trying to test the predicted theories. In this talk, I will discuss the search for a new boson at the LHC.

Indico Link
https://indico.hep.ipm.ir/e/e.khazaie

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

Link to join virtually:
https://meet.google.com/fnv-dfkk-ghb

4 DEC 2023
11:00 - 12:00

Abstract:

The theory of the strong force, quantum chromodynamics, describes the proton in terms of quarks and gluons. The proton is a state of two up quarks and one down quark bound by gluons, but quantum theory predicts that in addition there is an infinite number of quark-antiquark pairs. Both light and heavy quarks, whose mass is respectively smaller or bigger than the mass of the proton, are revealed inside the proton in high-energy collisions. However, it is unclear whether heavy quarks also exist as a part of the proton wavefunction, which is determined by non-perturbative dynamics and accordingly unknown: so-called intrinsic heavy quarks. It has been argued for a long time that the proton could have a sizable intrinsic component of the lightest heavy quark, the charm quark. Innumerable efforts to establish intrinsic charm in the proton have remained inconclusive. Here we provide evidence for intrinsic charm by exploiting a high-precision determination of the quark-gluon content of the nucleon based on machine learning and a large experimental dataset. We disentangle the intrinsic charm component from charm-anticharm pairs arising from high-energy radiation. We establish the existence of intrinsic charm at the 3-standard-deviation level, with a momentum distribution in remarkable agreement with model predictions. We confirm these findings by comparing to very recent data on Z-boson production with charm jets from the LHCb experiment.

Based on:
https://arxiv.org/abs/2208.08372

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

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

30 NOV 2023
11:00 - 12:00

Abstract:

After a short review of possible impact of vector neutral current NSI on the neutrino
oscillation patterns, I present a class of models based on a $U(1)$ gauge symmetry with a gauge
boson of mass $\sim 10$ MeV that lead to vector neutral current NSI with sizable couplings. I
will then discuss how Coherent Elastic neutrino Nucleus Scattering (CEnuNS) experiments can
test these models. In the end, I will focus on the axial neutral current NSI and show how the
DUNE experiment will be able to constrain its couplings.

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

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

29 NOV 2023
11:00 - 12:00

Abstract:

In this talk, we begin with a concise overview of the history of black holes. Then, we dive into the physics of black holes using AdS/CFT duality. Lastly, we explore how an old black hole can turn into a white hole by emitting a baby universe.

Indico Link
https://indico.hep.ipm.ir/e/h.zolfi

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

Link to join virtually:
https://meet.google.com/fnv-dfkk-ghb