1,506 research outputs found
Minimum-Bias and Early QCD Physics in ALICE
A Large Ion Collider Experiment (ALICE) is the dedicated heavy-ion experiment
at the Large Hadron Collider (LHC). In addition to its heavy-ion physics
program, it also has a rich proton-proton physics program benefiting from a
detector with a low momentum cut-off (pT about 50 MeV/c) and a small material
budget (about 11% of a radiation length until the outer wall of the main
tracking detector, the Time-Projection Chamber). ALICE has excellent means of
particle identification (PID) with methods ranging from specific energy loss
and time of flight to transition and Cherenkov radiation. The good primary and
secondary vertex resolution allows for measurements of strangeness and heavy
flavor with low backgrounds. ALICE has taken proton-proton collision data at
0.9, 2.36, and 7 TeV. In this article results of the first minimum-bias and
soft-QCD measurements are presented. Inclusive pseudorapidity, multiplicity,
and transverse momentum distributions are discussed as well as distributions of
identified particles including strange particles. Further, results on two-pion
Bose-Einstein correlations and the antiproton-to-proton ratio in collisions at
the LHC are shown.Comment: Proceedings of the Hadron Collider Physics Symposium 201
Event-Shape Engineering and Muon-Hadron Correlations with ALICE
Angular correlations of two and more particles are a sensitive probe of the
initial state and the transport properties of the system produced in heavy-ion
collisions. Two recent results of the ALICE collaboration are presented.
Event-shape engineering, a novel method, is applied to Pb-Pb collisions which
splits events within the same centrality interval into classes with different
average flow. The results indicate an interplay between radial and elliptic
flow likely related to the initial-state eccentricity. In pp and p-Pb
collisions, recent results revealed intriguing long-range correlation
structures reminiscent of features observed in heavy-ion collisions. The use of
forward detectors allowed to show that long-range correlation structures
persist also at large rapidities in p-Pb collisions.Comment: Proceedings of the European Physical Society Conference on High
Energy Physics (EPS-HEP2015), Vienna, Austria, 22-29 July 201
Overview of ALICE Results at Quark Matter 2014
The results released by the ALICE collaboration at Quark Matter 2014 address
topics from identified-particle jet fragmentation functions in pp collisions,
to the search for collective signatures in p-Pb collisions to precision
measurements of jet quenching with D mesons in Pb-Pb collisions. This paper
gives an overview of the contributions (31 parallel talks, 2 flash talks and 80
posters) by the ALICE collaboration at Quark Matter 2014.Comment: Proceedings for ALICE overview plenary at Quark Matter 201
Measurement of jet quenching with I_CP and I_AA,Pythia in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV with ALICE
This paper discusses the measurement of I_CP and I_AA,Pythia with ALICE (A
Large Ion Collider Experiment). An away-side suppression is found expected from
in-medium energy loss. Further, and unexpected, a near-side enhancement is seen
which has not been reported by previous experiments at lower energies.Comment: Proceedings: Rencontres de Moriond QCD and High Energy Interactions
201
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