ITMP Seminar "Intersecting D-brane models and the anomalous magnetic moment of the muon"

Dear Colleagues,

We are pleased to announce that the next ITMP seminar will be held on Wednesday, Nov 9, 18:00 (Moscow time). It will be organised via zoom.

Speaker: Francois Rondeau, the Sorbonne

Title: Intersecting D-brane models and the anomalous magnetic moment of the muon

Abstract: The anomalous magnetic moment of the muon ($(g-2)_{\mu}$) might be one of the most promising signals of new physics beyond the Standard Model (SM). The theoretical calculation predicts a value smaller than the experimental measurement from the Brookhaven National Laboratory and Fermilab experiments, with a standard deviation of $4.7\sigma$. This talk will discuss recently proposed solutions to this discrepancy in the framework of low mass scale strings, large extra dimensions and intersecting D-brane physics.

After reminding some basic aspects of intersecting D-brane models, and in particular how the SM of particle physics can be obtained in this framework, we will present two proposals able to explain (part of) the observed discrepancy. They are based on the contributions to the $(g-2)_{\mu}$ coming from the Kaluza-Klein (KK) states of the lepton number gauge boson, corresponding to an open string tied to a leptonic $U(1)$ brane, as well as from light scalars corresponding to the first stringy excitations of an open string stretched between two D-branes intersecting with an ultra-small angle. In both cases, we show that there is a region of the parameter space compatible with the current experimental bounds, where these states can provide significant contributions to the $(g-2)_{\mu}$, and fully or partially bridge the gap in the observed discrepancy. We then build the minimal D-brane configurations able to realise these two proposals.

The talk is based on 2110.01247, 2112.07587 and 2209.11152.

If you want to join the seminar please register here before 16:00, November 9 here.

If you would like to subscribe to newsletters about ITMP seminars, please, contact seminar@itmp.msu.ru