APS April 2022

Session

B and Top

9 Apr 2022, 12:30

US

93. Identification of additional b-jets in the $t\bar{t}$ plus heavy flavor production with two leptons of the opposite sign in the final state using BDT for differential cross- section measurements

Egor Antipov (Oklahoma State University (US))

09/04/2022, 12:30

Oral presentation

Top quark pair-production in association with one or two additional $b$-jets is one of the main backgrounds in the search for $t\bar{t}+H$ production, and in BSM physics searches involving top and bottom quarks in the final states. Precise measurement of $t\bar{t}+b$ and $t\bar{t}+bb$ differential cross sections will help to significantly reduce systematic and modeling uncertainties in future...

65. Measurement of the $CP$-violating phase $\phi_s$ in $B_s^0\rightarrow J/\psi\phi$ decays in ATLAS at $13~\mathrm{TeV}$

Easwar Anand Narayanan (University of New Mexico (US))

09/04/2022, 12:30

Oral presentation

A measurement of the $B_s^0\rightarrow J/\psi\phi$ decay parameters using $80~\mathrm{fb}^{-1}$ of integrated luminosity collected with the ATLAS detector from $13~\mathrm{TeV}$ proton-proton collisions at the LHC is presented. The measured parameters include the $\textit{CP}$-violating phase $\phi_s$, the width difference $\Delta\Gamma_s$ between the $B_s^0$ meson mass eigenstates and the...

91. Studies of C-jet spectra in various Flavor Schemes for $t\bar{t}+c$ cross section measurement

Calvin Ainsworth (Oklahoma State University (US))

09/04/2022, 12:30

Oral presentation

A comparison of three flavor scheme, four flavor scheme and five flavor scheme has been performed using top quark pair-production with additional charm jet $(t\bar{t}+c)$ events simulated by MadGraph and showered by Pythia8. Spectra of additional c-jets that do not originate from the top quark decay are compared in the three schemes. These studies are motivated by the upcoming $t\bar{t}+c$...