Measurement of the tt̅ production cross section with an in situ calibration of b-jet identification efficiency
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Aaltonen, Timo Antero; Álvarez González, Bárbara; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Palencia Cortezón, José Enrique; Rodrigo Anoro, Teresa


Date
2011-04-13Derechos
© 2011 American Physical Society
Publicado en
Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 83(7), 071102(R)
Publisher
American Physical Society
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Abstract:
A measurement of the top-quark pair-production cross section in pp̅ collisions at √s=1.96 TeV using data corresponding to an integrated luminosity of 1.12 fb-1 collected with the Collider Detector at Fermilab is presented. Decays of top-quark pairs into the final states eν+ jets and μν+ jets are selected, and the cross section and the b-jet identification efficiency are determined using a new measurement technique which requires agreement between the measured cross sections with exactly one and with multiple identified b quarks from the top-quark decays. Assuming a top-quark mass of 175 GeV/c2, a cross section of 8.5±0.6(stat)±0.7(syst)pb is measured.
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