3,029 research outputs found
Heavy flavour production in ALICE
We review the most recent studies on the performance of ALICE in heavy
flavour production measurements in both hadronic and semileptonic decay
channels.Comment: Proceedings of the Symposium on Hadron Collider Physics, Durham,
North Carolina (USA), 22-26 May 200
Beauty production with the ALICE detector
Heavy flavour pairs produced in hadronic reactions provide a valuable
laboratory for the study of strong interactions. Due to their relatively large
mass, the production of heavy quarks should be reliably calculable in the
perturbative approach. Charm and beauty quarks once produced in a heavy ion
collision have to propagate through the surrounding quark-gluon matter. Heavy
quark states are then a sensitive probe of the properties of the dense medium.
ALICE is a general-purpose experiment equipped to reconstruct, among other
signals, leptons from open charm and beauty via their leptonic decays in p-p,
p-A and A-A collisions. In these proceedings, we present feasibility studies
for ALICE measurements of beauty production in central Pb-Pb collisions at
s_{NN}^1/2=5.5TeV using semileptonic decays.Comment: 4 pages, 2 figures. Conference proceedings for "The XLth Rencontres
de Moriond", Session devoted to QCD and High Energy Hadronic Interactions, La
Thuile, Italy, March 12-19, 200
The ALICE EMCal L1 trigger first year of operation experience
The ALICE experiment at the LHC is equipped with an electromagnetic
calorimeter (EMCal) designed to enhance its capabilities for jet, photon and
electron measurement. In addition, the EMCal enables triggering on jets and
photons with a centrality dependent energy threshold. After its commissioning
in 2010, the EMCal Level 1 (L1) trigger was officially approved for physics
data taking in 2011. After describing the L1 hardware and trigger algorithms,
the commissioning and the first year of running experience, both in proton and
heavy ion beams, are reviewed. Additionally, the upgrades to the original L1
trigger design are detailed.Comment: Proceedings of TWEPP-12, Oxford. 10 pages, 9 figure
Level-1 jet trigger hardware for the ALICE electromagnetic calorimeter at LHC
The ALICE experiment at the LHC is equipped with an electromagnetic
calorimeter (EMCal) designed to enhance its capabilities for jet measurement.
In addition, the EMCal enables triggering on high energy jets. Based on the
previous development made for the Photon Spectrometer (PHOS) level-0 trigger, a
specific electronic upgrade was designed in order to allow fast triggering on
high energy jets (level-1). This development was made possible by using the
latest generation of FPGAs which can deal with the instantaneous incoming data
rate of 26 Gbit/s and process it in less than 4 {\mu}s.Comment: proceeding of TWEPP-10 at Aachen. 6 pages, 4 figure
Physics of the Muon Spectrometer of the ALICE Experiment
The main goal of the Muon spectrometer of the ALICE experiment at LHC is the
measurement of heavy quark production in p+p, p+A and A+A collisions at LHC
energies, via the muonic channel. Physics motivations and expected performances
have been presented in this talk.Comment: 10 pages and 4 figures. Talk presented in the ICPAQGP Conference,
February 8-12, 2005, Salt Lake City, Kolkata, India. Web page of the
conference : http://www.veccal.ernet.in/~icpaqgp
Performance of prototypes for the ALICE electromagnetic calorimeter
The performance of prototypes for the ALICE electromagnetic sampling
calorimeter has been studied in test beam measurements at FNAL and CERN. A
array of final design modules showed an energy resolution of about
11% / 1.7 % with a uniformity of the response
to electrons of 1% and a good linearity in the energy range from 10 to 100 GeV.
The electromagnetic shower position resolution was found to be described by 1.5
mm 5.3 mm /. For an electron identification
efficiency of 90% a hadron rejection factor of was obtained.Comment: 10 pages, 10 figure
Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at = 5.02 TeV
Two-particle angular correlations between unidentified charged trigger and
associated particles are measured by the ALICE detector in p-Pb collisions at a
nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum
range 0.7 5.0 GeV/ is examined,
to include correlations induced by jets originating from low
momen\-tum-transfer scatterings (minijets). The correlations expressed as
associated yield per trigger particle are obtained in the pseudorapidity range
. The near-side long-range pseudorapidity correlations observed in
high-multiplicity p-Pb collisions are subtracted from both near-side
short-range and away-side correlations in order to remove the non-jet-like
components. The yields in the jet-like peaks are found to be invariant with
event multiplicity with the exception of events with low multiplicity. This
invariance is consistent with the particles being produced via the incoherent
fragmentation of multiple parton--parton scatterings, while the yield related
to the previously observed ridge structures is not jet-related. The number of
uncorrelated sources of particle production is found to increase linearly with
multiplicity, suggesting no saturation of the number of multi-parton
interactions even in the highest multiplicity p-Pb collisions. Further, the
number scales in the intermediate multiplicity region with the number of binary
nucleon-nucleon collisions estimated with a Glauber Monte-Carlo simulation.Comment: 23 pages, 6 captioned figures, 1 table, authors from page 17,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/161
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