INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the inclusive and dijet cross-sections of b-jets 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: 2011 vol. 231 p. 1 - 23
ISSN:
1434-6044
Resumen:
The inclusive and dijet production cross-sections have been measured for
jets containing b-hadrons (b-jets) in proton-proton collisions at a
centre-of-mass energy of sqrt(s) = 7 TeV, using the ATLAS detector at
the LHC. The measurements use data corresponding to an integrated
luminosity of 34 pb^-1. The b-jets are identified using either a
lifetime-based method, where secondary decay vertices of b-hadrons in
jets are reconstructed using information from the tracking detectors, or
a muon-based method where the presence of a muon is used to identify
semileptonic decays of b-hadrons inside jets. The inclusive b-jet
cross-section is measured as a function of transverse momentum in the
range 20 < pT < 400 GeV and rapidity in the range |y| < 2.1.
The bbbar-dijet cross-section is measured as a function of the dijet
invariant mass in the range 110 < m_jj < 760 GeV, the azimuthal
angle difference between the two jets and the angular variable chi in
two dijet mass regions. The results are compared with
next-to-leading-order QCD predictions. Good agreement is observed
between the measured cross-sections and the predictions obtained using
POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured
bbbar-dijet cross-section. However, it does not reproduce the measured
inclusive cross-section well, particularly for central b-jets with large
transverse momenta.