[CvGmt News] [Notiziario] [Settimanale] avviso Colloquio della Classe di Scienze, prof. Lee Roberts (15.05.2019) -

[Valeria Giuliani]

>
> Colloqui della Classe di Scienze - Anno Accademico 2018/2019
>
> Mercoledì  15  maggio 2019
> *ore 14:00 *
>
> Sala Stemmi Palazzo della CarovanaPLEASE TAKE NOTE OF THE UNUSUAL TIME
> 14:00
> Lee Roberts
>
> *(Boston University**)*
>
>
>
> *Titolo: “**Exploring Terra Incognita with the World’s Largest Penning
> Trap”*
> *Abstract:*
> The Standard Model provides a very precise prediction of the muon’s
> magnetic anomaly  *aµ *= (*g**µ *- 2)/2, the deviation from 2 of the
> gyromagnetic ratio *gµ*. In his seminal 1926 paper, P.A.M. Dirac
> predicted that for electrons *ge *= 2, but experiments then revealed that *ge
> *was slightly larger than 2. The reason was to be found in Quantum
> Mechanics, and the first radiative correction to *ge , *calculated by
> Julian Schwinger, explained a deviation of order 0.1 %. Today, the Standard
> Model predicts the value of *aµ *to a precision of ± 0.3 parts per
> million (ppm).  Dedicated experiments have measured *a*μ to ± 0.54 ppm
> precision. Therefore, precision measurements of the anomaly provide a
> stringent test of the Standard Model’s completeness, since Nature knows
> about all forces that could contribute to the muon’s magnetism, including
> those from New Physics that has not yet been discovered.
>
> I will review the intellectual history that began with the discovery of
> spin and the *g*-factor of the electron and its role on the development
> of Modern Physics. Then I will focus on the measurements of the muon
> magnetic anomaly, which include particle counting techniques, and nuclear
> magnetic resonance (NMR) around the 45 m circumference of the ring to
> monitor and measure the precision magnetic field.  A new experiment with a
> precision goal of ± 0.14 ppm is now in progress now at Fermilab, which
> should clarify whether or not differences that have surfaced between theory
> and experiment are statistically significant at the five standard deviation
> level.
>
> Valeria Giuliani
> Scuola Normale Superiore
> Servizio alla Didattica e Allievi
> tel. 050 509260
> Piazza dei Cavalieri, 7
> 56126 Pisa
> E-mail: valeria.giuliani at sns.it
> E-mail: classi at sns.it
>
>
>
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