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Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p -Pb Collisions at sNN =5.02 TeV

Acharya, S ; Adolfsson, Jonatan LU ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Nassirpour, Adrian LU orcid ; Oskarsson, Anders LU ; Silvermyr, David LU orcid ; Stenlund, Evert LU ; Vislavicius, Vytautas LU and Zou, S. (2019) In Physical Review Letters 122(7).
Abstract
Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|<0.8) are measured in p-Pb collisions at √sNN=5.02  TeV. The analysis is carried out for the 0%–20% (high) and 60%–100% (low) multiplicity ranges. The jet contribution in the correlation distribution from high-multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavor decay electrons in the transverse momentum interval... (More)
Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|<0.8) are measured in p-Pb collisions at √sNN=5.02  TeV. The analysis is carried out for the 0%–20% (high) and 60%–100% (low) multiplicity ranges. The jet contribution in the correlation distribution from high-multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavor decay electrons in the transverse momentum interval 1.5<pT<4  GeV/c in high-multiplicity events, with a significance larger than 5σ. The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavor particles at midrapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anisotropy, Modulation, Angular correlations, Azimuthal anisotropy, Azimuthal modulation, Collision systems, Correlation distribution, Fourier decomposition, High multiplicity, Transverse momenta, Charged particles
in
Physical Review Letters
volume
122
issue
7
article number
072301
publisher
American Physical Society
external identifiers
  • scopus:85062043839
  • pmid:30848618
ISSN
1079-7114
DOI
10.1103/PhysRevLett.122.072301
language
English
LU publication?
yes
additional info
Export Date: 6 March 2019
id
5cfa9bc5-e874-47eb-9e62-48484ffd5047
date added to LUP
2019-03-06 11:00:55
date last changed
2023-04-09 05:01:55
@article{5cfa9bc5-e874-47eb-9e62-48484ffd5047,
  abstract     = {{Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|&lt;0.8) are measured in p-Pb collisions at √sNN=5.02  TeV. The analysis is carried out for the 0%–20% (high) and 60%–100% (low) multiplicity ranges. The jet contribution in the correlation distribution from high-multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavor decay electrons in the transverse momentum interval 1.5&lt;pT&lt;4  GeV/c in high-multiplicity events, with a significance larger than 5σ. The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavor particles at midrapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.}},
  author       = {{Acharya, S and Adolfsson, Jonatan and Christiansen, Peter and Ljunggren, Martin and Nassirpour, Adrian and Oskarsson, Anders and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and Zou, S.}},
  issn         = {{1079-7114}},
  keywords     = {{Anisotropy; Modulation; Angular correlations; Azimuthal anisotropy; Azimuthal modulation; Collision systems; Correlation distribution; Fourier decomposition; High multiplicity; Transverse momenta; Charged particles}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p -Pb Collisions at sNN =5.02 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.122.072301}},
  doi          = {{10.1103/PhysRevLett.122.072301}},
  volume       = {{122}},
  year         = {{2019}},
}