INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the flavour composition of dijet events in pp collisions at √s =7 TeV with 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. 73 p. 1 - 23
ISSN:
1434-6044
Resumen:
This paper describes a measurement of the flavour
composition of dijet events produced in pp collisions at sqrt{s}=7 TeV
using the ATLAS detector. The measurement uses the full 2010 data
sample, corresponding to an integrated luminosity of 39 pb^-1. Six
possible combinations of light, charm and bottom jets are identified in
the dijet events, where the jet flavour is defined by the presence of
bottom, charm or solely light flavour hadrons in the jet. Kinematic
variables, based on the properties of displaced decay vertices and
optimised for jet flavour identification, are used in a multidimensional
template fit to measure the fractions of these dijet flavour states as
functions of the leading jet transverse momentum in the range 40 GeV to
500 GeV and jet rapidity |y| < 2.1. The fit results agree with the
predictions of leading- and next-to-leading-order calculations, with the
exception of the dijet fraction composed of bottom and light flavour
jets, which is underestimated by all models at large transverse jet
momenta. The ability to identify jets containing two b-hadrons,
originating from e.g. gluon splitting, is demonstrated. The difference
between bottom jet production rates in leading and subleading jets is
consistent with the next-to-leading-order predictions.