Abstract
The elliptic flow, v2, of muons from heavy-flavour hadron decays at forward rapidity (2.5<y<4) is measured in Pb–Pb collisions at sNN=2.76 TeV with the ALICE detector at the LHC. The scalar product, two- and four-particle Q cumulants and Lee–Yang zeros methods are used. The dependence of the v2 of muons from heavy-flavour hadron decays on the collision centrality, in the range 0–40%, and on transverse momentum, pT, is studied in the interval 3<pT<10 GeV/c. A positive v2 is observed with the scalar product and two-particle Q cumulants in semi-central collisions (10–20% and 20–40% centrality classes) for the pT interval from 3 to about 5 GeV/c with a significance larger than 3σ, based on the combination of statistical and systematic uncertainties. The v2 magnitude tends to decrease towards more central collisions and with increasing pT. It becomes compatible with zero in the interval 6<pT<10 GeV/c. The results are compared to models describing the interaction of heavy quarks and open heavy-flavour hadrons with the high-density medium formed in high-energy heavy-ion collisions.
Highlights
Experiments with ultra-relativistic heavy-ion collisions aim at investigating the properties of strongly-interacting matter at very high temperatures and energy densities
We have reported on a measurement of the elliptic flow of muons from heavy-flavour hadron decays ity in central and semi-central Pb–Pb collisions at a√t sfNoNrw=ar2d.7r6apTiedV
The systematic comparison of scalar product, two- and four-particle Q cumulants and Lee–Yang zeros helps in understanding the processes that build up the observed differences between two-particle correlation methods and multi-particle correlation methods and suggests that flow fluctuations are significant
Summary
Experiments with ultra-relativistic heavy-ion collisions aim at investigating the properties of strongly-interacting matter at very high temperatures and energy densities. Muons from heavy-flavour hadron decays at forward rapidity [21] in the interval 2 < pT < 16 GeV/c and 4 < pT < 10 GeV/c, respectively. A complementary measurement at the same energy, provided by the heavy-flavour decay muon elliptic flow at forward rapidity (2.5 < y < 4), is of great interest in order to provide new constraints for models that implement the heavy-quark interactions with the medium. In this Letter, we present the measurement of the elliptic flow of muons from heavy-flavour hadron (2.5 < y < 4) in Pb–Pb collisions at.
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