@article{3181366,
    title = "Dielectron production in proton-proton collisions at root s=7 TeV",
    author = "Acharya, S. and Collaboration, A. L. I. C. E. and Acosta, F. T. and and Adamova, D. and Adolfsson, J. and Aggarwal, M. M. and Rinella, G. and Aglieri and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and and Aiola, S. and Akindinov, A. and Al-Turany, M. and Alam, S. N. and and Albuquerque, D. S. D. and Aleksandrov, D. and Alessandro, B. and Alfaro and Molina, R. and Ali, Y. and Alici, A. and Alkin, A. and Alme, J. and Alt, and T. and Altenkamper, L. and Altsybeev, I. and Anaam, M. N. and Andrei, C. and and Andreou, D. and Andrews, H. A. and Andronic, A. and Angeletti, M. and and Anguelov, V. and Anson, C. and Anticic, T. and Antinori, F. and and Antonioli, P. and Anwar, R. and Apadula, N. and Aphecetche, L. and and Appelshaeuser, H. and Arcelli, S. and Arnaldi, R. and Arnold, O. W. and and Arsene, I. C. and Arslandok, M. and Audurier, B. and Augustinus, A. and and Averbeck, R. and Azmi, M. D. and Badala, A. and Baek, Y. 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    journal = "Journal of High Energy Physics",
    year = "2018",
    number = "9",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP09(2018)064",
    keywords = "Heavy Ion Experiments",
    abstract = "The first measurement of e(+)e(-) pair production at mid-rapidity
(vertical bar eta vertical bar(e) < 0.8) in pp collisions at root s =
7TeV with ALICE at the LHC is presented. The dielectron production is
studied as a function of the invariant mass (m(ee )< 3.3 GeV/c(2)), the
pair transverse momentum (p(T,ee) < 8 GeV/c), and the pair transverse
impact parameter (DCA(ee)), i.e., the average distance of closest
approach of the reconstructed electron and positron tracks to the
collision vertex, normalised to its resolution. The results are compared
with the expectations from a cocktail of known hadronic sources and are
well described when PYTHIA is used to generate the heavy-flavour
contributions. In the low-mass region (0.14 < m(ee) < 1.1 GeV/c(2)),
prompt and non-prompt e(+)e(-) sources can be separated via the DCA(ee).
In the intermediate-mass region (1.1 < m(ee) < 2.7 GeV/c(2)), a
double-differential fit to the data in m(ee) and p(T,ee) and a fit of
the DCA(ee) distribution allow the total cc and bb cross sections to be
extracted. Two different event generators, PYTHIA and POWHEG, can
reproduce the shape of the two-dimensional m(ee) and p(T,ee) spectra, as
well as the shape , of the DCA(ee) distribution, reasonably well.
However, differences in the c (c) over bar and b (b) over bar cross
sections are observed when using the generators to extrapolate to full
phase space. Finally, the ratio of inclusive to decay photons is studied
via the measurement of virtual direct photons in the transverse-momentum
range 1 < p(T) < 8 GeV/c. This is found to be unity within the
statistical and systematic uncertainties and consistent with
expectations from next-to-leading order perturbative quantum
chromodynamic calculations."
}