5 research outputs found
Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil
Serological survey and risk factors for brucellosis in water buffaloes in the state of Pará, Brazil
Damming Amazon Rivers: Environmental impacts of hydroelectric dams on Brazil’s Madeira River according to local fishers’ perception
Measurement of Upsilon production in collisions at root s=2.76 TeV
The production of , and mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of collected in proton-proton collisions at a centre-of-mass energy of TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the transverse momentum and rapidity, over the ranges GeV/ and . The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be sigma (pp -> Upsilon(1S)X) x B(Upsilon(1S) -> mu(+)mu(-)) = 1.111 +/- 0.043 +/- 0.044 nb, sigma (pp -> Upsilon(2S)X) x B(Upsilon(2S) -> mu(+)mu(-)) = 0.264 +/- 0.023 +/- 0.011 nb, sigma (pp -> Upsilon(3S)X) x B(Upsilon(3S) -> mu(+)mu(-))s = 0.159 +/- 0.020 +/- 0.007 nb, where the first uncertainty is statistical and the second systematic
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The LHCb Upgrade I
Abstract
The LHCb upgrade represents a major change of the
experiment. The detectors have been almost completely renewed to
allow running at an instantaneous luminosity five times larger than
that of the previous running periods. Readout of all detectors into
an all-software trigger is central to the new design, facilitating
the reconstruction of events at the maximum LHC interaction rate,
and their selection in real time. The experiment's tracking system
has been completely upgraded with a new pixel vertex detector, a
silicon tracker upstream of the dipole magnet and three
scintillating fibre tracking stations downstream of the magnet. The
whole photon detection system of the RICH detectors has been renewed
and the readout electronics of the calorimeter and muon systems have
been fully overhauled. The first stage of the all-software trigger
is implemented on a GPU farm. The output of the trigger provides a
combination of totally reconstructed physics objects, such as tracks
and vertices, ready for final analysis, and of entire events which
need further offline reprocessing. This scheme required a complete
revision of the computing model and rewriting of the experiment's
software.</jats:p