High Energy Physics Seminars this week - Mukhopadhyay and Radhakrishnan both moved to L. Stasi Seminar Room!!!

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_*
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*Tuesday, 22 September *2026, at *16:00* - *_L. Stasi Seminar Room_* 
-*https://indico.ictp.it/event/11518/*

Satyanarayan Mukhopadhyay (IACS, Kolkata)


*“Prospects of Measuring the Atmospheric Muon Neutrino and Antineutrino 
Flux Ratio with the ATLAS Detector**"*
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_Abstract_

There is a significant uncertainty in the prediction of atmospheric muon 
neutrino and antineutrino flux ratio using different flux models, 
especially at higher energies. We study the prospects of experimentally 
measuring this flux ratio as a function of energy with the ATLAS 
detector at the LHC. To this end, we compute the contained-vertex and 
external upward going charged current event rates induced by atmospheric 
muon (anti)neutrinos through deep inelastic scattering at the 4 kiloton 
hadron calorimeter (HCAL) component of ATLAS. We illustrate the event 
selection criteria necessary to eliminate the cosmic ray muon background 
for the above event classes. While the contained vertex events have a 
striking topology with a muon being created inside the HCAL and then 
traveling to the muon chamber possibly through the tracker, for muons 
with energy larger than 3 GeV, nearly 10 times more events are obtained 
for the external upward going muons created in the rock column below the 
detector. Our estimates show that the energy dependence of the ratio of 
negative and positively charged muons induced by atmospheric muon 
neutrino and antineutrino fluxes can be measured by ATLAS up to a muon 
energy of 100 GeV, with 1000-live days of neutrino physics exposure over 
a period of several years, considering only the period with the LHC 
beams not in circulation, but the detector and magnetic fields of ATLAS 
in operation.

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*To attend via Zoom kindly register here:*
https://zoom.us/meeting/register/dwPC9zMkROaZGvDstWIbrA


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*Thursday, 24 September *2026, at *16:00* - *_L. Stasi Seminar 
Room_*-*https://indico.ictp.it/event/11514/*

Rajath Radhakrishnan (University of Oxford)


*“Lessons on Gauging Non-Invertible Symmetries**"*
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_Abstract_

  Symmetries and their gauging have played a pivotal role in the 
construction of quantum field theories describing the fundamental forces 
of nature. In recent years, the notion of symmetry has undergone a 
significant generalization with the advent of non-invertible symmetries: 
transformations that act non-invertibly on quantum field theories while 
retaining many of the hallmark features of conventional symmetries. In 
1+1 dimensions, gauging such symmetries provides a vast generalisation 
of the familiar notion of orbifolding in CFTs.

In this talk, I will introduce a framework for gauging non-invertible 
symmetries in 2+1 dimensions. I will highlight the parallels with the 
1+1-dimensional story, as well as the important new subtleties that 
arise in 2+1 dimensions. Finally, I will show how this procedure reveals 
new relations between QFTs that cannot be obtained by gauging invertible 
symmetries.
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*To attend via Zoom kindly register here:*
https://zoom.us/meeting/register/JYX1GC-AQjmquY21Q2vWsg