Seminar: Yoav Afik

Wednesday 19 Aug 2020, 09:30 → 10:30 US/Pacific

Topic: EPE Spring Fest
Date: Aug 19, 2020 09:09 AM Pacific Time (US and Canada)

Meeting Recording:
https://washington.zoom.us/rec/share/wchyfp-zxE1OHImW40vdfpd7G7jBaaa80SYc-_dbnR4spYWAOdUp8kNIYZPKSxKv

Access Password: atlas@2020

Recording password: atlas@2020

09:30 → 10:10 Search for new phenomena in final states with two leptons and 0 or 1 b-tagged jets at $\sqrt{s} = 13$ TeV using the ATLAS detector

Recent LHCb measurements present a pattern of deviations from the Standard Model prediction in rare B-meson decays.
These measurements show an imbalance in the ratio of B-meson decays to a pair of muons in association with a Kaon and decays to a pair of electrons in association with a Kaon.
If the measured deviations are indeed present in nature, new physics may mediate interactions involving a pair of same flavour leptons, a $b$- and an $s$-quark.
One possible approach to model a signal that explains the anomalies is a four-fermion contact interaction between two quarks ($b,s$) and two leptons ($ee, \mu\mu$), which motivates a search for final states with two leptons by using b-tagging techniques.
Contact Interactions of $b s \ell \ell$ are studied, in high values of the invariant mass of both leptons, for b-tagged and b-veto categories.
This model is characterized by the scale and coupling of the new physics, $\Lambda$ and $g_*$, respectively.
The analysis is done using the full Run 2 proton-proton collision dataset at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, corresponding to 139 $fb^{-1}$.
As the analysis is still ongoing, the current status and results are presented.

Speaker: Yoav Afik (Technion- Israel Institute of Technology (IL))

Washington_Seminar_19082020.pdf

10:10 → 10:30 Q&A