OPOMNIK: IJS KOLOKVIJ, sreda, 25. 1. 2023, ob 13. uri, dr. Vladimir Vava Gligorov

[Nataša Goševac]

Vabimo vas na 8. predavanje iz sklopa "Kolokviji na IJS" v letu 2022/23, ki bo v sredo, 25. januarja 2023, ob 13. uri »v živo« v Veliki predavalnici Instituta »Jožef Stefan« na Jamovi cesti 39 v Ljubljani, kjer bo tudi manjša pogostitev.

 

Napovednik predavanja najdete tudi na naslovu  <http://www.ijs.si/ijsw/Koledar_prireditev> http://www.ijs.si/ijsw/Koledar_prireditev, posnetke preteklih predavanj pa na  <https://bit.ly/2YH8LYk> Arhiv TV IJS in  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs.

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dr. Vladimir Vava Gligorov

Univerza Sorbona, CNRS, Francija

 

Koherentni test leptonske univerzalnosti v prehodih med kvarki b in s

 

Standardni model fizike delcev je trenutno najpopolnejša teorija mikroskopskega sveta. V zadnjih desetletjih je uspešno prestal številne eksperimentalne preizkuse. Hkrati pa ne more biti popolna teorija narave, saj delci in sile v standardnem modelu ne morejo razložiti makroskopskih pojavov, kot je temna snov ali asimetrija med snovjo in antisnovjo v vesolju. Univerzalnost leptonov je temeljna, čeprav naključna simetrija, ki pravi, da se posredniki elektrošibkih sil enako močno sklapljajo z vsemi tremi generacijami leptonov. Ima široko paleto enostavnih in teoretično robustnih eksperimentalnih posledic, zato se lahko uporablja za oblikovanje posebej močnih ničelnih testov standardnega modela. Razpravljal bom o nedavni objavi eksperimenta LHCb o posebni vrsti tega ničelnega testa: merjenje univerzalnosti elektronov in mionov v prehodih med kvarki b in s. Opisal bom eksperimentalne vidike te meritve, razpravljal o razlikah v primerjavi s prejšnjimi testi univerzalnosti leptonov in končal s sklepi za prihodnost.

 

Predavanje bo v angleščini.

Lepo vabljeni!

 

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We invite you to the 8th Institute colloquium in the academic year 2022/23. The colloquium will be held on Wednesday January 25 2023 at 1 PM. The lecturer will deliver a live lecture in the main Institute lecture hall, Jamova 39, Ljubljana, followed by a small banquet.

 

To read the abstract click  <http://www.ijs.si/ijsw/Koledar_prireditev> http://www.ijs.si/ijsw/Koledar_prireditev. Past colloquia are posted on  <https://bit.ly/2YH8LYk> Arhiv TV IJS and  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs.

 

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Dr. Vladimir Vava Gligorov

Sorbonne Université, CNRS, France

 

Coherent test of lepton universality in beauty to strange quark transitions

 

The Standard Model of particle physics is our most complete theory of the microscopic world and has passed numerous experimental tests over the last decades. At the same time it cannot be a complete theory of nature, not least because the particles and forces in the Standard Model cannot explain macroscopic phenomena such as dark matter or the matter-antimatter asymmetry of the universe. Lepton universality is a fundamental, although accidental, symmetry which states that the electroweak force mediators couple equally to all three generations of leptons. It has a wide range of straightforward and theoretically robust experimental consequences, and can therefore be used to construct particularly powerful null tests of the Standard Model of particle physics. I will discuss a recent publication by the LHCb experiment of a particular type of this null test: the measurement of electron-muon universality in beauty to strange quark transitions. I will describe the experimental aspects of this measurement, discuss the differences with respect to previous lepton universality tests, and draw some conclusions for the future.

 

Cordially invited!

 

 

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