Study
of the W+jets sample with at least one jet tagged by both SecVtx and SLT
Lucio
Cerritob, Tony Lissa,
Anyes Taffarda
a University
of Illinois
Urbana-Champaign
b University of Oxford
Summary
In this analysis we
investigate the heavy flavor composition of the W+jets sample using 163
pb-1 of data from ppbar collisions at a center of mass
of 1.96 TeV collected by the CDF detector. We select events
consistent with the production of a W boson with one or more jets. We
identify the W boson by its decay to an electron or muon plus a
neutrino. Both the
electron and muon have large transverse momentum, PT.
The neutrino is undetected and results in an imbalance in transverse
energy, labeled missing ET. Quarks produced in association
with the W, hadronize and are observed as jets of charge and neutral
particles. We classify the events according to the number of jets
observed. We enhance the heavy flavor composition of the sample
by using the SecVtx algorithm [1]
which identifies b-jets from their displaced secondary verticies. We
then use the SLT algorithm [2], which identifies
the semileptonic decay
of the B-hadrons to muons, on the jet(s) already tagged by SecVtx.
We referred as double tagged (DT), those jets tagged by both the
SecVtx and the SLT algorithms.
We estimate each of the
Standard Model contributions to the W+jets
sample with DT jets for events with 1, 2 and >= 3jets, and compare
the prediction with the observed data.
Based on the number of
observed events and the number of expected
backgrounds from the Standard Model we set a limit on the excess of
events.
We complement the study by
comparing some kinematic distributions of
the observed events with those expected from the Standard Model.
Public
note (to be updated soon)
Wine & Cheese (05/08/05) ppt pdf
Last Updated : Tuesday, June 10,
2005 by Anyes
