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T: Fachverband Teilchenphysik
T 27: Higgs: Decay into fermions I
T 27.1: Vortrag
Dienstag, 31. März 2020, 17:00–17:15, H-HS X
Charm tagging and search for ZH → llcc decay with ATLAS data — •Supriya Sinha1, Tatjana Lenz2, and Jochen Dingfelder3 — 1DESY-Zeuthen — 2Uni Bonn — 3Uni Bonn
The discovery of Higgs boson in 2012 opened the gates to many new analyses with the aim to understand its properties. Analyses have been performed to study various Higgs boson decay channels. Boldly, it decays to a pair of fermions or bosons. From theoretical understanding, Higgs is more likely to couple to a pair of heavier fermions as compared to the lighter ones, which is the reason its decay to third generation fermions have been studied rigorously. More interestingly, Higgs also couples to second generation fermions, but no such decays could be established up to now. Additionally, the small decay fraction into charm quarks makes it susceptible to BSM modifications, if they exist. A measurement of this charm decay fraction would either unfold new physics or help in constraining BSM scenarios.
To detect the Higgs decay to charm quarks, one has to develop a method to identify charm jets. A direct method of the so-called "charm tagging" utilises common b-tagging algorithms trained on charm jets. Instead of using multivariate analysis techniques, one can identify them using the reconstruction of charm meson decay: D*+→ D0(→ K− π+) π+. This talk will focus on the description of D*-based identification method. In addition, both charm identification methods are used to evaluate limits on the ZH (H→ cc, Z→ ll) cross section. The analysis is performed on 2017 data with a centre of mass energy of 13 TeV and a luminosity of 43.6 fb−1.