Göttingen 2012 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 37: Top-Quark: Eigenschaften 1
T 37.8: Vortrag
Montag, 27. Februar 2012, 18:30–18:45, ZHG 105
Studies for a top quark mass measurement in the dilepton channel using the mT2 variable at ATLAS — •Kaven Yau, Tatevik Abajyan, Markus Cristinziani, Sara Ghasemi, Gia Khoriauli, Agnieszka Leyko, Ralph Schaefer, and Kirika Uchida — Universitaet Bonn
The value of the top quark mass is an unknown parameter of the Standard Model, i.e. it cannot be obtained by theoretical calculations. As the heaviest elementary particle in the standard model, the top quark produces a significant contribution to the electroweak radiative corrections. A precise measurement sets constraints on particles predicted by physics models beyond the Standard Model.
A measurement of the top quark mass in the dilepton channel is studied. A mass measurement in the dilepton channel is challenging, due to the production of two neutrinos. In order to circumvent this difficulty, the Cambridge mT2 variable is used. The mT2 variable is used in pair production events with two missing particles and represents a lower bound to the parent particles mass.
The mass measurement is based on the calibration curve method, with pp collision data at the LHC, measured with the ATLAS detector.