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Measurements of e+e- pairs from open heavy flavor in p+p and d+A collisions at s NN =200 GeV

Adare, A; Afanasiev, S; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Bataineh, H; Gustafsson, Hans-Åke LU ; Haslum, Eva LU ; Oskarsson, Anders LU and Rosendahl, Sarah LU , et al. (2017) In Physical Review C 96(2).
Abstract
We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in p+p collisions at sNN=200 GeV. The e+e- pair yield from bb and cc is separated by exploiting a double differential fit done simultaneously in dielectron invariant mass and pT. We used three different event generators, pythia, mc@nlo, and powheg, to simulate the e+e- spectra from cc and bb production. The data can be well described by all three generators within the detector acceptance. However, when using the generators to extrapolate to 4π, significant differences are observed for the total cross section. These difference are less pronounced for bb than for cc. The same model dependence was observed in already published d+A data. The p+p data are also directly... (More)
We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in p+p collisions at sNN=200 GeV. The e+e- pair yield from bb and cc is separated by exploiting a double differential fit done simultaneously in dielectron invariant mass and pT. We used three different event generators, pythia, mc@nlo, and powheg, to simulate the e+e- spectra from cc and bb production. The data can be well described by all three generators within the detector acceptance. However, when using the generators to extrapolate to 4π, significant differences are observed for the total cross section. These difference are less pronounced for bb than for cc. The same model dependence was observed in already published d+A data. The p+p data are also directly compared with d+A data in mass and pT, and within the statistical accuracy no nuclear modification is seen. © 2017 American Physical Society. (Less)
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Physical Review C
volume
96
issue
2
publisher
American Physical Society
external identifiers
  • scopus:85028775869
ISSN
2469-9985
DOI
10.1103/PhysRevC.96.024907
language
English
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9f72a8c2-3226-4586-80e3-869f66f3af7d
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2018-01-18 09:46:58
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2018-12-02 04:58:15
@article{9f72a8c2-3226-4586-80e3-869f66f3af7d,
  abstract     = {We report a measurement of e+e- pairs from semileptonic heavy-flavor decays in p+p collisions at sNN=200 GeV. The e+e- pair yield from bb and cc is separated by exploiting a double differential fit done simultaneously in dielectron invariant mass and pT. We used three different event generators, pythia, mc@nlo, and powheg, to simulate the e+e- spectra from cc and bb production. The data can be well described by all three generators within the detector acceptance. However, when using the generators to extrapolate to 4π, significant differences are observed for the total cross section. These difference are less pronounced for bb than for cc. The same model dependence was observed in already published d+A data. The p+p data are also directly compared with d+A data in mass and pT, and within the statistical accuracy no nuclear modification is seen. © 2017 American Physical Society.},
  articleno    = {024907},
  author       = {Adare, A and Afanasiev, S and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H and Gustafsson, Hans-Åke and Haslum, Eva and Oskarsson, Anders and Rosendahl, Sarah and Silvermyr, David and Stenlund, Evert and , },
  issn         = {2469-9985},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review C},
  title        = {Measurements of e+e- pairs from open heavy flavor in p+p and d+A collisions at s NN =200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.96.024907},
  volume       = {96},
  year         = {2017},
}