Workshop EJČF 2018

Session

ATLAS physics

19 Jan 2018, 13:30

Bílý Potok (u Frýdlantu)

42. B-physics @ ATLAS

Tomáš Jakoubek (České vysoké učení technické v Praze)

19/01/2018, 13:30

The talk will give an overview of recent $B$-physics measurements at the ATLAS experiment, with a focus on the $CP$ violation in $B^0_s \rightarrow J/\psi(\mu^+\mu^−)\phi(K^+K^−)$ decay channel. In the Standard Model $CP$ violation is described by a phase in the CKM matrix. One of the manifestations of this complex phase is a phase shift between direct and mixing-mediated $B_s$ decays...

12. Muon opposite side tagging in $B_s \rightarrow J/\psi +\phi $

Lukáš Novotný (CTU FNSPE)

19/01/2018, 14:40

Complex phase in the CKM matrix describing quark mixing causes CP violation and can be studied in the decay $B^0_s \rightarrow J/\psi + \phi$. The determination of the initial flavour of neutral $B$ mesons can be inferred using information from the $B$ meson containing other pair-produced b-quark, reffered as opposite-side tagging. To study and calibrate the opposite-side tagging method,...

29. Search for BsPi

Radek Novotný (CTU FNSPE)

19/01/2018, 15:10

Last year, the D0 experiment announced the observation of narrow structure X(5568) in decay of B_s + \pi with almost 5 \sigma significance. This structure is investigated by the B-Physics Working group based on a data sample recorded with the ATLAS detector corresponding to 4.9 \fb^{-1} of pp collision data at 7 TeV and 19.5 \fb^{-1} at 8 TeV.

32. The Vector Boson Scattering in the ZZ Production at ATLAS

Ondřej Penc (České vysoké učení technické v Praze)

19/01/2018, 16:05

Evidence of the vector boson scattering (VBS) phenomena was discovered in Run 1
of the ATLAS detector at the LHC in the same sign WW production channel. Since
the detector acquire more and more data in Run 2, the phenomena starts to be
accessible also in the ZZ channel. This channel is very clean because of the
small background other than comming from QCD and provides a good opportunity...

43. Measurements of $t\bar{t}$ differential cross-sections in the all-hadronic channel

Ota Zaplatílek (CTU FNSPE)

19/01/2018, 16:45

Currently large $t\bar{t}$ production at the LHC allows detail study of the top quark, $t\bar{t}$quark pairs. The talk will instrodude the results of the analysis interested with the measurement of differential cross-section of high boosted $t$ quark and $t \bar{t}$ pairs as a function of various kinematic observables. Study is performed on the full datasets collected by the ATLAS detector at...