INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of ttbar production with a veto on additional central jet activity in pp collisions at √s = 7 TeV using the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2012 vol. 213 p. 1 - 23
ISSN:
1434-6044
Resumen:
A measurement of the jet activity in ttbar events
produced in proton-proton collisions at a centre-of-mass energy of 7 TeV
is presented, using 2.05 fb^-1 of integrated luminosity collected by
the ATLAS detector at the Large Hadron Collider. The ttbar events are
selected in the dilepton decay channel with two identified b-jets from
the top quark decays. Events are vetoed if they contain an additional
jet with transverse momentum above a threshold in a central rapidity
interval. The fraction of events surviving the jet veto is presented as a
function of this threshold for four different central rapidity interval
definitions. An alternate measurement is also performed, in which
events are vetoed if the scalar transverse momentum sum of the
additional jets in each rapidity interval is above a threshold. In both
measurements, the data are corrected for detector effects and compared
to the theoretical models implemented in MC@NLO, POWHEG, ALPGEN and
SHERPA. The experimental uncertainties are often smaller than the spread
of theoretical predictions, allowing deviations between data and theory
to be observed in some regions of phase space.